Antimicrobial, antioxidant activity and phytochemical prospection of Eugenia involucrata DC leaf extracts / Atividade antimicrobiana, antioxidante e prospecção fitoquímica dos extratos das folhas de Eugenia involucrata DC

The species Eugenia involucrata DC. is a plant native to Brazil and is traditionally used for intestinal problems, however, little research has documented about its biological potential and phytochemical profile. Thus, the objective of this study was to carry out preliminary phytochemical prospecting, antimicrobial and antioxidant potential of E. involucrata extracts. Using the E. involucrata leaves, aqueous and organic extracts were obtained using the following solvents (ethanol, methanol, hexane, acetone, dichloromethane and ethyl acetate). The phytochemical prospecting detected the presence of saponins, steroids, flavonoids and tannins in the extracts. Ethanolic and methanolic extracts presented antimicrobial activity for most of the bacterial strains tested, as well as for yeast Candida albicans, with concentrations between 3.12 and 50 mg/mL. The ethanolic and metanolic extract presented high free radical sequestration potential (>90%). The methanol extract showed an IC50 value statistically equal to that found for the commercial antioxidant BHT (p <0.05). The crude extracts obtained with ethanol and methanol were the most promising. These results suggest that methanolic, ethanolic and aqueous extracts are a promising source of natural bioactive.

A espécie Eugenia involucrata DC. é uma planta nativa do Brasil e tradicionalmente utilizada para problemas intestinais, porém, poucas pesquisas documentam sobre seu potencial biológico e perfil fitoquímico. Assim, o objetivo deste trabalho foi realizar uma prospecção fitoquímica preliminar, o potencial antimicrobiano e antioxidante dos extratos de E. involucrata. A partir das folhas de E. involucrata, foram obtidos extratos aquosos e orgânicos com os seguintes solventes (etanol, metanol, hexano, acetona, diclorometano e acetato de etila). A prospecção fitoquímica detectou a presença de saponinas, esteroides, flavonóides e taninos nos extratos. Os extratos etanólico e metanólico apresentaram atividade antimicrobiana para a maioria das cepas bacterianas testadas, assim como para a levedura Candida albicans, com concentrações entre 3,12 e 50 mg/mL. Os extratos etanólico e metanólico apresentaram alto potencial de sequestro de radicais livres (> 90%). O extrato metanólico apresentou IC50 estatisticamente igual ao encontrado para o antioxidante comercial BHT (p <0,05). Os extratos brutos obtidos com etanol e metanol foram os mais promissores. Esses resultados sugerem que os extratos metanólico, etanólico e aquoso são uma fonte promissora de bioativos naturais.

Estudo do potencial antiviral sobre Sars Cov-2 dos compostos identificados nas folhas do extrato bruto de Eugenia pyriformis / Study of the antiviral potential on Sars Cov-2 of compounds identified in the leaves of the gross extract of Eugenia pyriformis / Estudio del potencial antiviral sobre Sars Cov-2 de los compuestos identificados en las hojas del extracto crudo de Eugenia pyriformis

Eugenia pyriformis Cambess (Myrtaceae), conhecida popularmente como uvaia. Em seus frutos são encontrados compostos fenólicos com ação antioxidante e nas folhas foram detectados altos teores de flavonoides e taninos hidrolisados que se mostraram inibidor da protease de 2019 - nCoV e SARS-CoV. Neste sentido, o objetivo deste estudo foi a obtenção do extrato bruto das folhas, a análise da composição química e a possibilidade da ação antiviral frente ao SARS COV-2. O extrato bruto (EB) foi obtido a partir das folhas secas de E. pyriformis, pela técnica de maceração dinâmica com esgotamento do solvente (etanol 90º GL) e concentrado em evaporador rotativo. Seis gramas do EB foram fracionados em cromatografia em coluna, e eluído com hexano, diclorometano, acetato de etila e metanol, as frações foram concentradas em um evaporador rotativo (Tecnal TE-210). O EB e as frações foram identificadas por cromatografia líquida de alta eficiência à espectrometria de massas de alta resolução (CLAE-ESI/qTOF). A identificação química do extrato bruto e frações das folhas de E. pyriformis evidenciou a presença de compostos fenólicos destacando os ácidos fenólicos, flavonoides e taninos. De forma complementar, foi realizado um levantamento bibliográfico sobre a provável ação antiviral dos compostos fenólicos e taninos presentes nas folhas de uvaia. Os resultados evidenciaram que os flavonoides quercetina e kaempferol possuem ação antiviral quando se ligam a glicoproteína do envelope ou capsídeo viral interferindo na ligação e penetração do vírus na célula. Este resultado coloca as folhas de E. pyriformis na lista de plantas com ação antiviral.

Eugenia pyriformis Cambess (Myrtaceae), popularly known as uvaia. In its fruits, phenolic compounds with antioxidant action are found and in the leaves, high levels of flavonoids and hydrolyzed tannins were detected, which proved to be an inhibitor of the 2019 protease - nCoV and SARS-CoV. In this sense, the objective of this study was to obtain the crude extract of the leaves, the analysis of the chemical composition and the possibility of antiviral action against SARS COV-2. The crude extract (EB) was obtained from the dried leaves of E. pyriformis, by the dynamic maceration technique with solvent exhaustion (ethanol 90º GL) and concentrated in a rotary evaporator. Six grams of EB were fractionated in column chromatography, and eluted with hexane, dichloromethane, ethyl acetate and methanol, the fractions were concentrated on a rotary evaporator (Tecnal TE-210). EB and fractions were identified by high performance liquid chromatography using high resolution mass spectrometry (HPLC-ESI/qTOF). The chemical identification of the crude extract and fractions of E. pyriformis leaves evidenced the presence of phenolic compounds, highlighting phenolic acids, flavonoids and tannins. In addition, a bibliographic survey was carried out on the probable antiviral action of phenolic compounds and tannins present in uvaia leaves. The results showed that the flavonoids quercetin and kaempferol have antiviral action when they bind to the envelope glycoprotein or viral capsid, interfering with the binding and penetration of the virus into the cell. This result places E. pyriformis leaves in the list of plants with antiviral action.

Eugenia pyriformis Cambess (Myrtaceae), conocida popularmente como uvaia. En sus frutos se encuentran compuestos fenólicos con acción antioxidante y en las hojas se detectaron altos contenidos de flavonoides y taninos hidrolizados que demostraron inhibir la proteasa de 2019 - nCoV y SARS-CoV. En este sentido, el objetivo de este estudio fue obtener el extracto crudo de las hojas, el análisis de la composición química y la posibilidad de acción antiviral contra el SARS COV-2. El extracto crudo (EB) se obtuvo a partir de las hojas secas de E. pyriformis, mediante la técnica de maceración dinámica con agotamiento del disolvente (etanol 90º GL) y se concentró en evaporador rotatorio. Seis gramos de EB se fraccionaron en cromatografía en columna, y se eluyeron con hexano, diclorometano, acetato de etilo y metanol, las fracciones se concentraron en un evaporador rotatorio (Tecnal TE-210). El EB y las fracciones se identificaron mediante cromatografía líquida de alta resolución a espectrometría de masas de alta resolución (HPLC-ESI/qTOF). La identificación química del extracto crudo y de las fracciones de las hojas de E. pyriformis mostró la presencia de compuestos fenólicos destacando los ácidos fenólicos, los flavonoides y los taninos. De forma complementaria, se realizó un estudio bibliográfico sobre la probable acción antiviral de los compuestos fenólicos y los taninos presentes en las hojas de la uva. Los resultados mostraron que los flavonoides quercetina y kaempferol tienen acción antiviral cuando se unen a la glicoproteína de la envoltura o cápside viral, interfiriendo en la unión y penetración del virus en la célula. Este resultado sitúa a las hojas de E. pyriformis en la lista de plantas con acción antiviral.

Alternativas de controle do diabetes / Alternatives for diabetes control / Alternativas para el control de la diabetes

O Diabetes desde a antiguidade tem sido uma das maiores causas de morte entre as populações do globo, e segundo a Organização Mundial da Saúde continua assolando nos nossos dias. Apesar das descobertas de tratamentos mais eficazes, a doença vem avançando em progressões assustadoras atualmente, com projeções preocupantes para a saúde pública. Como estratégia de acompanhamento terapêutico, estatístico direcionado a portadores de diabetes, o Governo Federal lançou o programa HIPERDIA (Hipertensos e Diabéticos), que faz o acompanhamento da evolução da doença e das complicações dos pacientes. E neste sentido, também são utilizadas terapêuticas mais acessíveis como as plantas medicinais. O objetivo desta pesquisa consiste em realizar uma revisão bibliográfica abordando as opções de terapias de controle do diabetes oferecidas no Sistema Único de Saúde e pesquisar fitoterápicos com potencial hipoglicêmico aprovados pela Anvisa. Através de levantamento bibliográfico, foram identificadas oito espécies vegetais utilizadas pela medicina popular no controle do diabetes, sendo estas: Bauhinia Forficata, Syzygium Cumini, Annona Muricata, Cynara Scolymus, Momordica Charantia, Eugenia Uniflora e Baccharis Trimera. Essas plantas do programa, embora tenham comprovação de seu efeito hipoglicêmico e redutores dos sintomas diabéticos, pelas suas propriedades antioxidantes e antiinflamatórias, colabora para uma melhor qualidade de vida aos pacientes.

Since antiquity, Diabetes has been one of the biggest causes of death amon-g populations around the globe, and according to the World Health Organization, it continues to plague our days. Despite discoveries of more effective treatments, the disease is currently advancing in frightening progressions, with worrying projections for public health. As a therapeutic, statistical follow-up strategy aimed at people with diabetes, the Federal Government launched the HIPERDIA (Hypertensive and Diabetic) program, which monitors the evolution of the disease and the complications of patients. And in this sense, more accessible therapies such as medicinal plants are also used. The objective of this research is to carry out a literature review addressing the options for diabetes control therapies offered in the Unified Health System and to search for herbal medicines with hypoglycemic potential approved by Anvisa. Through a bibliographical survey, eight plant species used by folk medicine to control diabetes were identified, namely: Bauhinia Forficata, Syzygium Cumini, Annona Muricata, Cynara Scolymus, Momordica Charantia, Eugenia Uniflora and Bacharis Trimera. These plants in the program, although they have evidence of their hypoglycemic effect and reduce diabetic symptoms, due to their antioxidant and anti-inflammatory properties, contribute to a better quality of life for patients.

La diabetes ha sido desde la antigüedad una de las principales causas de muerte entre las poblaciones del planeta, y según la Organización Mundial de la Salud sigue haciendo estragos en nuestros días. A pesar de los descubrimientos de tratamientos más eficaces, la enfermedad avanza actualmente con una progresión aterradora, con proyecciones preocupantes para la salud pública. Como estrategia de seguimiento terapéutico, estadísticamente dirigida a las personas con diabetes, el Gobierno Federal puso en marcha el programa HIPERDIA (Hipertensión y Diabetes), que controla la evolución de la enfermedad y las complicaciones de los pacientes. En este sentido, también se utilizan terapias más accesibles, como las plantas medicinales. El objetivo de esta investigación es realizar una revisión bibliográfica que aborde las opciones de terapias para el control de la diabetes ofrecidas en el Sistema Único de Salud y buscar fitoterapias con potencial hipoglucemiante aprobadas por Anvisa. Mediante un estudio bibliográfico, se identificaron ocho especies vegetales utilizadas por la medicina popular en el control de la diabetes, a saber: Bauhinia Forficata, Syzygium Cumini, Annona Muricata, Cynara Scolymus, Momordica Charantia, Eugenia Uniflora y Baccharis Trimera. Estas plantas del programa, aunque han demostrado su efecto hipoglucemiante y reductor de los síntomas diabéticos, por sus propiedades antioxidantes y antiinflamatorias, colaboran a una mejor calidad de vida para los pacientes.

Chemical composition, antioxidant, antimicrobial activity, toxicity, genetic analysis and popular use of Eugenia luschnathiana (O. Berg) Klotzsch ex B. D. Jacks: a literature review / Composición química, actividad antioxidante, antimicrobiana, toxicidad, análisis genético y uso popular de Eugenia luschnathiana (O. Berg) Klotzsch ex B. D Jack: una revisión de la literatura

This review describes the geographical distribution, botanical data, popular use, chemical composition, pharmacological activities and genetic aspects related to Eugenia luschnathiana, a native Brazilian plant popularly known as "bay pitomba". E. luschnathiana leaves are characterized morphologically by the presence of a petiole, an attenuated base, acuminated apex, elliptical shape, and parallel venation. The major chemical compounds found in E. luschnathiana are sesquiterpenes. Literature reports showed that E. luschnathiana extracts have antioxidant properties and antimicrobial activity against Gram-negative and Gram-positive bacteria. The extractsfrom the leaf, fruit and stem, and a concentrated residual solution of its essential oil, displayed negligible toxicity. Lastly, a cytogenetic analysis indicated that some markers can be used for the study of genetic diversity, population structure, and genetic improvements. The information available on E. luschnathiana supports the hypothesis that this plant may be a source of compounds with promising pharmacological activity.

Esta revisión describe la distribución geográfica, datos botánicos, uso popular, composición química, actividad farmacológica y el análisis genético de Eugenia luschnathiana, una planta originaria del Brasil conocida popularmente como "pitomba da baía". Las hojas de E. luschnathiana se caracterizan por la presencia de pecíolo, base atenuada, ápice acuminado, forma elíptica y venación paralela. Su composición química presenta mayormente sesquiterpenos. Los informes en la literatura muestran que los extractos de E. luschnathiana presentan propiedades antioxidantes y actividad antimicrobiana contra las bacterias Gram-negativas y Gram-positivas. Los extractos de la hoja, fruto y tallo, y una solución residual concentrada del aceite esencial, presentaron baja toxicidad. Por último, un análisis citogenético indicó que algunos marcadores pueden utilizarse para estudios de diversidad genética, estructura poblacional y mejoramiento genético. Las informaciones disponibles acerca de E. luschnathiana proponen la hipótesis de que esta planta puede ser una fuente de compuestos con actividad farmacológica prometedora.

Antioxidant activity, antibacterial and inhibitory effect of intestinal disaccharidases of extracts obtained from Eugenia uniflora L. seeds / Atividade antioxidante, antibacteriana e efeito inibidor de dissacaridases intestinais de extratos obtidos das sementes de Eugenia uniflora L

The use of medicinal plants for disease prevention, treatment and cure is an ancient practice used by humanity, and many plants species are used in bioprospecting research. In this context, its stands out Eugenia uniflora L., populary known as pitangueira and belongs to the Myrtaceae family, with a wide geographic distribution and native of Brazil. In view of the therapeutic qualities of the plant and the lack of the studies on its seeds, the present study had as objective to evaluate the phytochemical profile of the extracts of Eugenia uniflora L. seeds, from different solvents, as well as their antibacterial activity, antioxidant and its inhibitory effect of intestinal disaccharidases. Results showed a high content of phenolic compounds and total flavonoids, thus characterizing antioxidant activity, also highlighting the best bacteriostatic action for the Gram positive strain of Staphylococcus aureus in the ethanolic fraction. Regarding the disaccharidases, a strong inhibitory action was observed for all concentrations, evidencing a antihyperglycemic potential. The present research allowed to concluded that Eugenia uniflora L. seeds have promising biological activities for the industrial sector, but a more detailed investigation is needed regarding their bioactive compounds.

A utilização de plantas com fins medicinais para prevenção, tratamento e cura de doenças é uma prática antiga utilizada pela humanidade, sendo que muitas espécies vegetais são usadas para a pesquisa da bioprospecção. Neste contexto, destaca-se a Eugenia uniflora L., conhecida popularmente como pitangueira e pertencente à família Myrtaceae, com ampla distribuição geográfica e nativa do Brasil. Diante das qualidades terapêuticas da planta e a falta de estudos sobre suas sementes, o presente trabalho teve como objetivo avaliar o perfil fitoquímico dos extratos das sementes de Eugenia uniflora L. a partir de diferentes solventes, bem como sua atividade antibacteriana, antioxidante e seu efeito inibidor de dissacaridases intestinais. Os resultados mostraram um alto teor de compostos fenólicos e flavonóides totais, caracterizando a atividade antioxidante, destacando também a melhor ação bacteriostática para a cepa Gram positiva de Staphylococcus aureus na fração etanólica. Em relação às dissacaridases, uma forte ação inibitória foi observada para todas as concentrações, evidenciando um potencial anti-hiperglicêmico. A presente pesquisa permitiu concluir que as sementes de Eugenia uniflora L. apresentam atividades biológicas promissoras para o setor industrial, mas é necessária uma investigação mais detalhada de seus compostos bioativos.

Hydroalcoholic Extract of Eugenia uniflora as Denture Disinfectant: Antimicrobial Activity and Effect on the Physical Properties of Polymethylmethacrylate

Abstract To the moment, there is no ideal substance for home-based denture disinfection. This study assessed in vitro the antimicrobial effect of the hydroalcoholic extract of Eugenia uniflora and the effect on the physical properties of denture polymethylmethacrylate (PMMA). Candida albicans, Staphylococcus aureus, and Klebsiella oxytoca were isolated from samples of saliva collected from denture wearers. The extracts were produced in three concentrations, according to the Brazilian Pharmacopeia. One hundred eighty-eight disc-shaped specimens of thermopolymerizable PMMA were prepared and randomly allocated to five treatment groups: sterile saline solution (0.85%; control); chlorhexidine digluconate (0.2%); and hydroalcoholic extract of E. uniflora (0.2%, 0.8%, and 1.16%). The specimens were disinfected for 8 hours/day for 30 days. Adherence of microorganisms to the surface, PMMA surface roughness, and color stability were assessed. Inferential statistics were performed with one- and two-way ANOVA/Tukey test, and Kruskal Wallis, Mann-Whitney U, and paired t-tests, at α=0.05. The extract of E. uniflora at 0.2% and 1.16% reduced the microbial load of K. oxytoca, while chlorhexidine digluconate significantly reduced microbial load of all microrganisms. Microbial adherence at day 10 was reduced by all experimental substances (p<0.001). Surface roughness was not affected by the disinfecting substances (p>0.05). Nevertheless, all experimental groups produced unacceptable color change at the end of the disinfection protocol (p<0.001). The non-adherent potential against microorganisms isolated from the oral cavity confirm the potential of use of the hydroalcoholic extract of E. uniflora as a denture disinfectant. Yet, unacceptable color changes may occur, regardless of extract concentration.

In vitro evaluation of Eugenia dysenterica in primary culture of human gingival fibroblast cells

Abstract: Eugenia dysenterica is a Brazilian tree investigated for its properties and bioactive compounds, which are believed to have both pharmacological and phytochemical therapeutic effects. The leaves of this tree contain tannins, flavonoids, terpenes, and saponins, with reportedly beneficial effects to the human body. Despite these therapeutic applications, its effects have never been tested on oral tissues. Therefore, the aim of the present study was to evaluate the cytotoxic and antioxidant effects and the anti-inflammatory and repair properties of the acetone fraction of E. dysenterica on primary culture of human gingival fibroblasts and on the immortalized murine macrophage cell line (RAW 264.7). For this purpose, a metabolic activity assay, a wound healing assay, a nitric oxide assay, and RT-qPCR were performed. The assays revealed a cytoprotective effect of this plant, suggested by the increase in the expression of SOD1 and NRF2. An antioxidant potential effect was observed in the DPPH• assay. However, the fraction of E. dysenterica did not show anti-inflammatory activity. In conclusion, Eugenia dysenterica may promote cytoprotection when associated with chlorhexidine digluconate because of its antioxidant effect. However, additional studies are necessary on other human dental tissues using other parts of the plant in order to develop a possible mouthwash to assist patients with oral disorders.

Eugenia Klotzschiana O. Berg Fruits as New Sources of Nutrients: Determination of their Bioactive Compounds, Antioxidant Activity and Chemical Composition

Abstract: The Cerrado is one of the world's biodiversity hotspots and Brazil's second largest biome. Many native species of the Brazilian Cerrado provide fruits that have unique sensory characteristics and high nutritional value. This study aimed at characterizing the pulp of Eugenia klotzschiana O. Berg, concerning its proximal composition, bioactive compound content and antioxidant activity. The pulp under study had high moisture (89.47 g kg-1) and caloric (96.07 kcal kg-1) values whereas its contents of protein (0.59 g kg-1) and lipids (2.35 g kg-1) were low. The cerrado pear pulp also had high iron content (16.5 mg kg -1) and dietary fiber (6.45 g kg-1), besides 0.034-0,055 mg kg-1 carotenoids, 8.66 mg kg-1 ascorbic acid and 0.66 mg kg-1 total chlorophyll. Total phenolic compounds (333.41-566.33 mg EAG kg-1) and flavonoids (225-50 mg EQ kg-1) were found by extraction methods named Method 1 (water) and Method 2 (acetone+methanol), respectively. Thus, the cerrado pear can be an alternative to improving nutrient intake and to providing sustainable use of the native flora in the Cerrado.

Perfil fitoquímico e atividade gastroprotetora dos frutos de Eugenia mattosii / Phytochemical profile and gastroprotective activity of eugenia mattosii fruits

ABSTRACT BACKGROUND: Extracts obtained from plants and fruits provide a relatively safe and practical alternative for the conventional medicine of gastrointestinal diseases. The specie Eugenia mattosii, popularly known in Brazil as "cerejinha", belongs to Myrtaceae family. Species of this family present pharmacological properties, and can be used in the treatment of gastrointestinal disorders. OBJECTIVE: The aim of this study was to determine the phytochemical profile and evaluate the gastroprotective activity of Eugenia mattosii fruits. METHODS: Phytochemical analysis was carried out by thin layer chromatography and gastroprotective assays were performed using two experimental models: acute ulcer model induced by ethanol/HCl and acute ulcer model induced by non-steroidal anti-inflammatory drug (indomethacin). Total lesion area (mm2) and relative lesion area (%) were determined. RESULTS: The results of the phytochemical analysis indicated that the bark and pulp and seeds of E. mattosii present phenolic compounds, terpenes and/or steroids. In gastric ulcer model induced by ethanol was evidenced significant reduction of damaged areas for doses of 50 and 250 mg/ kg of seeds methanol extract, while in the indomethacin-induced ulcer model, all parts of the fruit presented defense capability of the gastric mucosa by reducing lesions at doses of 50, 125 and 250 mg/kg. CONCLUSION: The results demonstrate that the specie E. mattosii has bioactive compounds that provide gastroprotective activity, presenting possible therapeutic potential.

RESUMO CONTEXTO: Extratos obtidos de plantas e frutos fornecem uma alternativa relativamente segura e prática para os remédios convencionais de doenças gastrointestinais. A espécie Eugenia mattosii, popularmente conhecida no Brasil como "cerejinha", pertence à família Myrtaceae. Espécies desta família apresentam propriedades farmacológicas e podem ser utilizadas no tratamento de distúrbios gastrointestinais. OBJETIVO: O objetivo deste estudo foi determinar o perfil fitoquímico e avaliar a atividade gastroprotetora dos frutos de Eugenia mattosii. MÉTODOS: A análise fitoquímica foi realizada por cromatografia em camada delgada e dois modelos experimentais foram utilizados para avaliação da atividade gastroprotetora em camundongos: modelo de úlcera gástrica induzida por anti-inflamatório não-esteroidal (indometacina) e modelo de úlcera gástrica induzida por etanol/HCl. RESULTADOS: Os resultados da análise fitoquímica indicaram que a casca e polpa e as sementes de E. mattosii apresentam compostos fenólicos, terpenos e/ou esteroides. No modelo de úlcera gástrica induzido pelo etanol, foi evidenciada redução significativa de áreas danificadas para doses de 50 e 250 mg/kg do extrato das sementes, enquanto no modelo de úlcera induzida por indometacina, todas as partes do fruto apresentaram capacidade de defesa da mucosa gástrica ao reduzir as lesões nas doses de 50, 125 e 250 mg/kg. CONCLUSÃO: Os resultados demonstram que a espécie E. mattosii possui compostos bioativos com atividade gastroprotetora, apresentando possível potencial terapêutico.

Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (Eugenia uniflora L. ) on lettuce and maize / Bioatividade alelopática de extrato aquoso fresco e infuso de pitangueira (Eugenia uniflora L. ) sobre alface e milho

This study aimed to analyse the allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry leaves on the germination of lettuce and the initial development of maize. Brazilian cherry leaves were used to prepare a fresh aqueous extract (200 g L-1) and an infused extract (100 g L-1), which were diluted to concentrations of 0.4, 0.8, 1.2, 1.6 or 2.0% w/v. The variables evaluated in lettuce were the germination rate (GR), germination time index (GTI), germination speed index (GSI) and root length (RL). To determine the effect on the initial development of maize, we measured the shoot (SL) and root (RL) length. The experimental design included a factorial 2 × 5 design (two extracts and five concentrations), in addition to a control treatment (no extract). In general, the allelopathic bioactivity differed between the fresh and infused extracts. The fresh extract was more phytotoxic for the GR and RL of lettuce. Some beneficial results were observed for the infused extract, including an increase in the RL of lettuce and SL of maize. These effects were dependent on the extract concentration. Thus, there is evidence that Brazilian cherry extracts have allelopathic bioactivity.

O presente trabalho tem por objetivo em analisar a bioatividade alelopática do extrato fresco e infuso de pitangueira sobre a germinação de alface e no desenvolvimento inicial de milho. Para tanto, utilizaram-se folhas frescas de pitangueira para preparação de extratos aquosos fresco (200 g L-1) e infuso (100 g L-1), diluídos em 0,4; 0,6; 1,2; 1,6 e 2,0% p/v de concentração. Os parâmetros avaliados em alface foram porcentagem (PG), tempo médio (TMG) e velocidade média de germinação (VMG) e comprimento de raiz (CR). Já no desenvolvimento inicial do milho, obteve-se o comprimento de raiz (CR) e parte aérea (CPA). Os experimentos foram conduzidos em esquema fatorial 2x5 + tratamento controle (ausência de extrato), com dois tipos de extratos e cinco concentrações. De modo geral, a bioatividade alelopática dos extratos frescos e infusos foi diferente, sendo que o extrato fresco mostrou-se fitotóxico sobre a PG e CR de alface. Alguns resultados benéficos foram observados com o extrato infuso como aumento no CR de alface e no CPA de milho. Os efeitos desses extratos dependem das concentrações onde são testados. Dessa forma, há evidência de que os extratos de pitangueira possuem bioatividade alelopática.

Chemical composition, antioxidant and antibacterial activities of essential oils from leaves and flowers of Eugenia klotzschiana Berg (Myrtaceae)

ABSTRACT Many essential oils (EOs) of different plant species possess interesting antimicrobial effects on buccal bacteria and antioxidant properties. Eugenia klotzschiana Berg (pêra-do-cerrado, in Portuguese) is a species of Myrtaceae with restricted distribution in the Cerrado. The essential oils were extracted through the hydrodistillation technique using a modified Clevenger apparatus (2 hours) and chemically characterized by GC-MS. The major compounds were α-copaene (10.6 %) found in oil from leaves in natura, β-bisabolene (17.4 %) in the essential oil from dry leaves and α-(E)-bergamotene (29.9 %) in oil from flowers. The antioxidant activity of essential oils showed similarities in both methods under analysis (DPPH and ABTS˙+) and the results suggested moderate to high antioxidant activity. The antibacterial activity was evaluated by determining minimum inhibitory concentrations (MICs), using the microdilution method. MIC values below 400 µg/mL were obtained against Streptococcus salivarius (200 µg/mL), S. mutans (50 µg/mL), S. mitis (200 µg/mL) and Prevotella nigrescens (50 µg/mL). This is the first report of the chemical composition and antibacterial and antioxidant activities of the essential oils of E. klotzschiana. These results suggest that E. klotzschiana, a Brazilian plant, provide initial evidence of a new and alternative source of substances with medicinal interest.

Estudo comparativo da atividade antibacteriana de extratos vegetais de Senna spectabilis, Rosmarinus officinalis e Eugenia uniflora frente à cepa padrão de Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 6538 e Streptococcus pyogenes ATCC 19615 / Comparative study on the activity of Senna spectabilis, Rosmarinus officinalis and Eugenia uniflora vegetable antibacterial extracts against Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 6538 and Streptococcus pyogenes ATCC 19615 standard strains

O interesse em terapias alternativas e o uso terapêutico por derivados de plantas vêm crescendo nos últimos anos, obtendo um grande avanço científico no aspecto químico e farmacológico, a Organização Mundial da Saúde (OMS), considera as plantas medicinais como importantes instrumentos da assistência farmacêutica. Objetivo: Determinar atividade antibacteriana comparada entre os extratos de Senna spectabilis, Rosmarinus officinalis e Eugenia uniflora frente à cepa padrão de Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 6538 e Streptococcus pyogenes ATCC 19615. As folhas de E. uniflora, R. officinallis e S. spectabilis foram coletadas no Horto de plantas medicinais da Universidade Estadual de Maringá ­ UEM/PR e as cepas foram fornecidas pela Universidade Paranaense ­ Unipar. A atividade antibacteriana foi determinada por meio da técnica do microdiluição em placa, empregando revelador de crescimento Alamar Blue Assay (MABA). A concentração mínima inibitória (CIM) empregando R. officinalis, E. uniflora, frente a cepa de S. aureus ATCC pode revelar resultados de 125 µg/mL, para extratos de S. spectabilis o CIM foi de 250 µg/mL; para S. pyogenes o CIM de 125 µg/mL foi admitido apenas para R. officinalis e S. spectabilis, E. uniflora apresentou resultados de 500 µg/mL, para P. aeruginosa o CIM para os três extratos foi superior a 500 µg/mL. Os extratos são promissores quando empregados contra S. aureus e S. pyogenes, exceto para P. aeruginosa, no entanto cabe buscar novas alternativas para tratamento deste Gram-negativo.

The interest in alternative therapies and therapeutic use of plant extracts has been increasing in recent years, and has had great scientific advances regarding the chemical and pharmacological aspects. The World Health Organization (WHO) considers medicinal plants as important pharmaceutical care instruments. In order to determine the compared antibacterial activity between Senna spectabilis, Rosmarinus officinalis and Eugenia uniflora extracts against standard strains of Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 6538 and Streptococcus pyogenes ATCC 19615, the leaves of E. uniflora, R.officinallis and S. spectabilis were collected in the medicinal plant garden of the State University of Maringa - UEM/PR, and strains were provided by University Paranaense - Unipar. The antibacterial activity was determined by broth microdilution plate technique using Alamar Blue Assay (MABA) growth revelant. The minimum inhibitory concentration (MIC) using R. officinalis, E. uniflora against the S. aureus ATCC strain revealed results of 125 µg/mL, for S. spectabilis extracts, MIC was of 250 µg/mL; S. pyogenes resulted in a MIC of 125 µg/mL was admitted only for R. officinalis and S. spectabilis, E. uniflora results showed 500 µg/mL, and for P. aeruginosa, MIC was greater than 500 µm/mL for the three extracts. The extracts are considered as promising when used against S. aureus and S. pyogenes, but not for P. aeruginosa. However, new alternatives are being sought for treating this gram-negative strain.

Obtaining the essential oil of Syzygium aromaticum, identification of eugenol and its effect on Streptococcus mutans / Obtención del aceite esencial de Syzygium aromaticum, identificación del eugenol y su efecto sobre Streptococus mutans

Dental caries is a disease which affects the human oral cavity. Currently, the search for active principles of plants with antimicrobial effect seems promising for dental therapy. In this article the activity of the essential oil of Syzygium aromaticum (clove) was evaluated with an emphasis on its antimicrobial properties. The oil was obtained by hydrodistillation, characterized by thin layer chromatography and chemical tests. The main compound was identified in the oil obtained from the flower buds and its antibacterial activity against plank¬tonic cells Streptcoccus mutans ATCC700611 was assessed by performing serial dilutions, from 15 up to 1000 ug/mL, compared with 0.12 percent chlorhexidine and dimethylsulfoxide. MIC was also determined. Subsequently, UFC was analyzed and compared with CMR Test Ivoclar Vivadent. The efficiency in obtaining the oil was 2.20 percent. By using the CCD technique, a fraction was revealed by UV light, corresponding to eugenol. It had a good response for triterpenoids and flavonoids. It showed greater antimicrobial activity at concentrations of 1000, 500 and 250ug/ ml. The MIC and MBC of the oil was 125 to 250ug/mL, respectively. Eugenol was found as an active principle in the oil obtained. Currently, the impact of using plant extracts has favored the evaluation of alternative, effective and biocompatible antibacterial agents for the formulations of oral hygiene products applied to the prevention or treatment of oral diseases.

La caries dental es una enfermedad que afecta la cavidad oral en los humanos. Actualmente la búsqueda de principios activos de plantas con efecto antimicrobiano representa una promesa en la terapia Odontológica. El presente trabajo, evaluó la actividad, del aceite esencial de Syzygium aromaticum (clavo) con énfasis en su propiedad antimicrobiana. El aceite fue obtenido por hidrodestilación, caracterizado por cromatografía en capa delgada y pruebas químicas. Se iden¬tificó el compuesto principal en el aceite obtenido de los botones florales y se evaluó su actividad antibacteriana contra células plantónicas de Streptcoccus mutans ATCC (700611) realizándose diluciones seriadas; desde 15 hasta 1000ug/mL, comparándose con clorhexidina al 0.12 por ciento y dimetilsulfóxido, además se determinó la CMI. Posteriormente, se analizó las UFC, comparándose con el Test CMR® Ivoclar Vivadent. La eficiencia en la obtención del aceite fue de 2.20 por ciento. Por la técnica de CCD se identificó una fracción al revelado UV, corres¬pondiente al eugenol. Presentó respuesta positiva para flavonoides y triterpenos. Mostró mayor actividad antimicrobiana a las concentraciones de 1000, 500 y 250 ug/mL. La CMI y CMB del aceite, resultó a 125 y 250 ug/mL respectivamente. Se comprobó la presencia del eugenol como principio activo en el aceite obtenido. Actualmente la proyección del uso de extractos de plantas ha favorecido la evaluación de agentes antibacterianos alternos, eficaces y biocompatibles para su empleo en las formulaciones de productos de higiene bucal aplicados a la prevención o tratamiento de enfermedades orales.

Inhibitory activity of Syzygium aromaticum and Cymbopogon citratus (DC.) Stapf. essential oils against Listeria monocytogenes inoculated in bovine ground meat

This research evaluated the antimicrobial effect of the clove (Syzygium aromaticum) and lemongrass (Cymbopogon citratus (DC.) Stapf.) essential oils (EOs) against Listeria monocytogenes ATCC 19117 growth added to bovine ground meat stored under refrigeration (5 ± 2 °C) for three days. The EOs, extracted by hydrodistillation and analyzed by gas chromatography-mass spectrometry (GC-MS), were tested in vitro using an agar well diffusion methodology for determination of Minimum Inhibitory Concentration (MIC). The MIC concentrations for both essential oils on culture tested of L. monocytogenes were 1.56%. The EOs concentrations applied in contaminated ground beef were 1.56, 3.125 and 6.25% (w/v) based on MIC levels and possible activity reductions by food constituents. The bacteria populations were significantly reduced (p < 0.05) after one day of storage in ground meat samples treated with clove and lemongrass EOs at concentrations of 1.56%. There were no significant counts of L. monocytogenes in samples at the other concentrations of the two oils applied after the second day of storage. The sensory acceptability evaluation of the bovine ground meat samples treated with EOs showed that the addition at concentrations higher than 1.56% promote undesirable alterations of taste, odor and characteristic color. The application of EOs at low concentrations in food products can be used in combination with other preservation methods, such as refrigeration, to control pathogens and spoilage bacteria during shelf-life; which goes according to current market trends, where consumers are requesting natural products.

Bioautography-guided isolation of antibacterial compounds of essential oils from Thai spices against histamine-producing bacteria

The outbreak of histamine fish poisoning has been being an issue in food safety and international trade. The growth of contaminated bacterial species including Morganella morganii which produce histidine decarboxylase causes histamine formation in fish during storage. Histamine, the main toxin, causes mild to severe allergic reaction. At present, there is no well-established solution for histamine fish poisoning. This study was performed to determine the antibacterial activity of essential oils from Thai spices against histamine-producing bacteria. Among the essential oils tested, clove, lemongrass and sweet basil oils were found to possess the antibacterial activity. Clove oil showed the strongest inhibitory activity against Morganella morganii, followed by lemongrass and sweet basil oils. The results indicated that clove, lemongrass and sweet basil oils could be useful for the control of histamine-producing bacteria. The attempt to identify the active components using preparative TLC and GC/MS found eugenol, citral and methyl chavicol as the active components of clove, lemongrass and sweet basil oils, respectively. The information from this study would be useful in the research and development for the control of histamine-producing bacteria in fish or seafood products to reduce the incidence of histamine fish poisoning

Actividad antifúngica del aceite esencial de Eugenia caryophyllata sobre cepas de Candida tropicalis de aislados clínicos / Antifungal activity of the essential oil of Eugenia caryophyllata on Candida tropicalis strains from clinical isolates

Candidiasis is an opportunistic fungal infection caused by Candida yeasts. In Brazil, C. tropicalis is the second most frequently isolated microorganism after C. albicans. The arising of strains resistant to conventional antifungal agents has increased the search for new alternatives from natural products, especially essential oils. This research investigated essential oil activity against strains of C. tropicalis by disk diffusion method. The minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were also determinate. In the disk diffusion, the essential oils of Cinnamomum zeylanicum, Eugenia caryophyllata and Origanum vulgare had the highest inhibition zones values. MIC and MFC values of E. caryophyllata essential oil were 512 and 1024 ug/mL, respectively. MIC and MFC amphotericin B values were identical (2 ug/mL). Therefore, it was concluded that E. caryophyllata essential oil has strong antifungal activity and may be subject to further studies.

La candidiasis es una infección fúngica oportunista causada por levaduras del género Candida. En Brasil, la especie C. tropicalis esta siendo aislada frecuentemente, es el segundo microorganismo más aislado después de C. albicans. La aparición de cepas resistentes a los antifúngicos convencionales ha aumentado la búsqueda de nuevas alternativas provenientes de productos naturales, especialmente los aceites esenciales. En este estudio se investigó la actividad de los aceites esenciales contra las cepas de C. tropicalis, utilizando el método de difusión en disco, la concentración inhibitoria mínima (CIM) y la concentración fungicida mínima (CFM). En el método de difusión en disco, con los aceites esenciales de Cinnamomum zeylanicum, Eugenia caryophyllata y Origanum vulgare se obtuvieron mayores valores de inhibición. La CIM y CFM del aceite esencial de Eugenia caryophyllata fueron 512 y 1024 ug/mL, mientras que los de la anfotericina B fueron idénticos, 2 ug/mL. Por lo tanto, se puede concluir que el aceite esencial de E. caryophyllata tiene potente actividad antifúngica y puede ser objeto de nuevos estudios sobre esta actividad.

Ação do óleo essencial de Syzygium aromaticum (L.) Merr. & L.M.Perry sobre as hifas de alguns fungos fitopatogênicos / Action of Syzygium aromaticum (L.) Merr. & L.M.Perry essential oil on the hyphae of some phytopathogenic fungi

Atualmente o uso de métodos alternativos para o controle de doenças e pragas na agricultura, visando minimizar os danos ao meio ambiente e à saúde pública é uma prática reconhecida e necessária. Este trabalho objetivou investigar a ação do óleo essencial de Syzygium aromaticum (L.) Merr. & L.M.Perry sobre o crescimento micelial in vitro dos fungos fitopatogênicos Rhizoctonia solani, Fusarium solani, Fusarium oxysporum e Macrophomina phaseolina. A análise por cromatografia gasosa acoplada com espectrometria de massa possibilitou a identificação de eugenol (83,6 por cento), acetato de eugenila (11,6 por cento) e cariofileno (4,2 por cento). A avaliação microscópica dos micélios dos fungos evidenciou diversas alterações morfológicas, como a presença de vacúolos, desorganização dos conteúdos celulares, diminuição na nitidez da parede celular, intensa fragmentação e menor turgência das hifas. O óleo essencial de cravo apresentou atividade fungicida na concentração de 0,15 por cento sobre o crescimento de R. solani, F. oxysporum e F. solani, entretanto não demonstrou essa atividade sobre M. phaseolina. Esses resultados indicam perspectivas favoráveis para posterior uso do óleo de cravo no controle desses fitopatógenos na agricultura.

Currently, the use of alternative methods to control diseases and pests in agriculture has been a recognized and necessary practice to minimize damages to the environment and public health. This study aimed to investigate the action of clove [Syzygium aromaticum (L.) Merr. & L.M.Perry] essential oil on the in vitro mycelial growth of the phytopathogenic fungi Rhizoctonia solani, Fusarium solani, Fusarium oxysporum and Macrophomina phaseolina. Analysis by gas chromatography-mass spectrometry allowed the identification of eugenol (83.6 percent), eugenyl acetate (11.6 percent) and caryophyllene (4.2 percent). Microscopic evaluation of mycelia showed several morphological changes such as presence of vacuoles, cell content disorganization, decreased cell wall clearness, intense fragmentation and lower turgescence of hyphae. Clove essential oil showed fungicidal activity at 0.15 percent on the growth of R. solani, F. oxysporum and F. solani, but not for M. phaseolina. These results indicate favorable perspectives for future use of clove essential oil to control these phytopathogens in agriculture.

Effects of ethanolic extract of Syzygium cumini (Linn) seed powder on pancreatic islets of alloxan diabetic rats.

The ethanolic extract of seeds of S. cumini increased body weight and decreased blood sugar level in alloxan diabetic albino rats. Level of significance for decrease in blood sugar after feeding alcoholic extract of S. cumini seeds in various doses was highly significant. The extract feeding showed definite improvement in the histopathology of islets. The most important finding is that the blood sugar level, which once dropped to normal levels after extract feeding was not elevated when extract feeding was discontinued for 15 days.

Effect of ethanolic extract of Eugenia jambolana seeds on gastric ulceration and secretion in rats.

Eugenia jambolana (Jamun) fruit has been reported to give soothing effect on human digestive system. Present study includes the effect of ethanolic extract of seeds of E. jambolana (EJE) against gastric ulcers induced by 2 h cold restraint stress (CRS), aspirin (ASP, 200 mg/kg, 4 h), 95% ethanol (EtOH, 1 ml/200 g, 1 h) and 4 h pylorus ligation (PL) in rats. To ascertain the mechanism of action of EJE, its effect was studied on mucosal offensive acid-pepsin secretion, lipid peroxidation (LPO, free radical) and defensive mucin secretion, cell proliferation, glycoprotein and glutathione (GSH, an antioxidant). Acute and subacute toxicity studies were also conducted for the safety profile of Eugenia jambolana. EJE 200 mg/kg, when administered orally for 10 days in rats was found to reduce the ulcer index in all gastric ulcer models. It tended to decrease acid-pepsin secretion, enhanced mucin and mucosal glycoprotein and decreased cell shedding but had no effect on cell proliferation. It showed antioxidant properties indicated by decrease in LPO and increase in GSH levels in the gastric mucosa of rats. Acute toxicity study indicated LD50 to be more than 10 times (>2000 mg/kg) of the effective ulcer protective dose while subactue toxicity study (>1000 mg/kg) indicated no significant change in the general physiological and haematological parameters, liver and renal function tests. The result of the present study indicates that E. jambolana seed has gastro-protective properties mainly through promotion of mucosal defensive factors and antioxidant status and decreasing lipid peroxidation.