ABSTRACT
ABSTRACT The Brazilian Savanna biome has the largest plant diversity among savannas worldwide and is the predominant biome in Goiás state, Brazil. Among plant species previously catalogued in the Brazilian Savanna, the Myrtaceae family has received attention, as these plants show great economic potential for its medicinal properties, food and ecological importance, highlighting in this context the Psidium genus. In order to contribute to the differentiation of problematic taxonomic groups, such as Myrtaceae, and to quality control of its plant material, morphological and venation leaf studies of four species of Psidium were performed. For this purpose, leaf samples of Psidium firmum O.Berg., P. myrsinites DC., P. laruotteanum Cambes., and P. guineense Sw. were collected from Goiás State University, Anápolis Air Base, and Serra de Caldas Novas State Park and submitted to classical techniques for morphological and leaf venation characterizations. The results showed that P. firmum presents brochidodromous secondary veins, marginal last venation of the fimbrial type, an abaxial surface with a grooved midrib, flat secondary veins on both sides, an apex obtuse to mucronate, and a rounded base. P. guineense presents trichomes on both surfaces, a grooved midrib on the adaxial surface and a prominent midrib on the abaxial surface, which distinguishes this species from all other Myrtaceae species examined in the present study. The species P. guineense and P. firmum presented a set of differential leaf characteristics among the others taxa of the genus, clearly separating these plants in the morphological identification key.
ABSTRACT
ABSTRACT Hyptis carpinifolia Benth., Lamiaceae, is a species known popularly as "rosmaninho" and "mata-pasto", and leaves are employed in Brazilian folk medicine to treat colds, flu, and rheumatism. The aim of this study was to perform a morphological description of H. carpinifolia and to evaluate the seasonal chemical variability of the leaf essential oils during 12 months. Macroscopic characterization of H. carpinifolia was carried out with the naked eye and with a stereoscopic microscope. Essential oils were isolated from leaves by hydrodistillation in Clevenger apparatus and analyzed by gas chromatography/mass spectrometry. Major compounds were found to be 1,8-cineole (39.6-61.8%), trans-cadina-1(6),4-diene (2.8-17.5%), β-caryophyllene (4.4-10.0%), prenopsan-8-ol (4.2-9.6%) and β-pinene (2.9-5.3%). Results of essential oils compositions were processed by cluster analysis and principal component analysis. Data showed high variability in the concentration of the components. Besides, there was a seasonal variability of chemical composition, probably related mainly to the rainfall regime.
ABSTRACT
Hyptidendron canum(Pohl ex Benth.) Harley, Lamiaceae, is popularly used as an antimalarial, anti-inflammatory, antiulcerative, antihepatotoxic and anticancer agent. The goal of this research was to perform the morphoanatomy study of H. canumleaves and stem and identify the main classes of secondary metabolites present in the of H. canumleaves. Such data have not been reported in the literature. The young leaves and stems were collected in Goiânia (GO), hand sectioned and prepared for microscope analysis. Reactions were performed for the identification of secondary metabolites of the dried and pulverized material. The crude ethanol extract was prepared and then fractioned by liquid-liquid partition with hexane, chloroform and ethyl acetate. Thin layer chromatography (TLC) analysis was performed on the fractions. The leaf blades presented adaxial epidermis constituted of polygonal cells with straight walls. On the abaxial epidermis cells with straight to wavy walls and diacytic and anisocytic stomates were noted. Non-glandular and glandular trichomes are present on both faces of the leaf blade. The petiole is grooved, and it presents single layered adaxial and abaxial epidermis. The cross section of the stem presents a generally quadrangular contour with the presence of non-glandular and glandular trichomes. The leaf reactions and TLC evidenced the presence of flavonoids, saponins, terpenes and lignanes. This works helps to increase knowledge of the morphoanatomy and the chemical classes present in H. canum.
Hyptidendron canum (Pohl ex Benth.) Harley, Lamiaceae, é utilizada popularmente como antimalárica, antiinflamatória, antiulcerativa, anti-hepatotóxica e anticancerígena. O objetivo deste trabalho foi realizar o estudo morfo-anatômico das folhas e caules e identificar as principais classes de metabólitos secundários presentes nas folhas de H. canum, dados ainda não descritos na literatura. As folhas e caules jovens coletados em Goiânia (GO) foram seccionados à mão livre e preparados para análise microscópica. Foram realizadas reações de identificação de metabólitos secundários do material dessecado e pulverizado. Preparou-se o extrato etanólico bruto, que posteriormente foi fracionado por partição líquido-líquido com hexano, clorofórmio e acetato de etila. As frações foram submetidas à análise cromatográfica em camada delgada (CCD). As lâminas foliares apresentam epiderme adaxial constituída por células poligonais com parede reta. Na epiderme abaxial observam-se células com parede reta a ondulada e estômatos diacíticos e anisocíticos. Tricomas tectores e glandulares estão presente em ambas as faces da lâmina foliar. O pecíolo apresenta aspecto canaletado, epiderme adaxial e abaxial unisseriada. O caule, em secção transversal possui contorno em geral quadrangular, com presença de tricomas tectores e glandulares. As reações e a CCD das folhas evidenciaram a presença de flavonóides, saponinas, terpenos e lignanas. Este trabalho contribuiu para um maior conhecimento da morfo-anatomia e das classes químicas presentes em H. canum.
ABSTRACT
O intuito deste trabalho de pesquisa foi obter parâmetros de controle de qualidade para a identificação da matéria-prima vegetal (folha) de Pimenta pseudocaryophyllus (Gomes) L. R. Landrum - Myrtaceae que ocorre no cerrado brasileiro. Para tanto foram coletadas amostras em Minas Gerais - Brasil e no Distrito Federal - Brasil e as exsicatas foram depositadas no Herbário da UFG n. UFG-27.159 e no Herbário Ezechias Paulo Heringer n. 21.745-0, respectivamente. Parte desse material botânico foi preparada para análises macro e microscópicas. Outra parte foi seca, triturada e usada para a triagem fitoquímica. O estudo mostrou que as folhas de P. pseudocaryophyllus são hipoestomáticas, têm grande quantidade de tricomas unicelulares na superfície abaxial, têm cavidades secretoras contendo compostos lipídicos e as células epidérmicas possuem paredes celulares espessas. Na triagem fitoquímica foram detectados compostos fenólicos, taninos e flavonóides. Os taninos foram dosados por diferentes métodos envolvendo reações colorimétricas e de precipitação com proteínas. Os diferentes resultados verificados chamam a atenção para a necessidade de se especificar o método utilizado juntamente com o limite mínimo de taninos totais estabelecido. Os resultados obtidos configuram-se como importantes parâmetros para o controle de qualidade da matéria-prima vegetal e denotam que a espécie em estudo possui um importante potencial fitoterápico que merece ser investigado em estudos farmacológicos e toxicológicos.
The goal of this research was to obtain quality control parameters for the identification of the plant drug of Pimenta pseudocaryophyllus (Gomes) L. R. Landrum that occurs in Brazilian savannah. So, two samples were collected, one in Minas Gerais state - Brazil, and the other one in Brasilia city - DF - Brazil, and the vouchers were deposited in the UFG Herbarium code number UFG-27159 and Ezechias Paulo Heringer Herbarium code number 21745-0, respectively. Part of the botanical material in both samples was prepared for microscopic analysis. The other one was air-dried, crushed to powder and used for phytochemical screening. The study has shown that P. pseudocaryophyllus leaves are hypostomatic, there are abundant unicellular trichomes in abaxial surface, there are secretory cavities with oily content and epidermal cells have thick wall. Tannins, phenolic compounds and flavonoids were detected in the phytochemical screening. The tannins had been quantified by different methods involving colorimetric and protein precipitation reactions, getting different results. This fact calls the attention for the necessity of specifying the method used together with the minimum tannins limit established. The results configure as important parameters for the quality control of the plant material and denote that the species in study take an important potential as herbal medicine that it deserves to be investigated in pharmacologic and toxicologic studies.