Estabilidad cromática de una cerámica de feldespato monocromática utilizada en sistema CAD/CAM sometida a inmersión de diferentes soluciones de tinción / Color stability of a monochromatic feldspar ceramic used in CAD/CAM system immersed in different staining solutions

RESUMEN: Objetivo: Determinar la estabilidad cromática de una cerámica de feldespato monocromática utilizada en sistema CAD/CAM sometida a inmersión de diferentes soluciones de tinción. Materiales y métodos: 90 discos de cerámica feldespática monocromática, divididos en 3 grupos según solución de tinción: agua destilada, café y té. Se realizaron 3 tomas de color: el día 0, 14 y 28, con un espectrofotómetro. Para determinar la diferencia de color (ΔE*), se restó la 2da y la 1era medida para los 14 días; y la 3era y la 2da medida para los 28 días. Resultados: Los resultados se interpretaron utilizando el Índice del Departamento Nacional de Normas (NBS). La muestra inmersa en agua destilada presentó valores ΔE* 1.424 y ΔE* 1.233; la muestra en café presentó valores ΔE* 3.327 y ΔE* 3.901; la muestra inmersa en té presentó valores ΔE* 4.597 y ΔE* 5.201. Se obtuvieron diferencias significativas al comparar la estabilidad cromática en las tres soluciones de tinción a los 14 y 28 días (p<0.001). Conclusiones: Existe diferencia significativa en la estabilidad cromática de una cerámica de feldespato monocromática sometida a inmersión de diferentes soluciones de tinción. Se obtuvieron cambios de color marcados en las muestras inmersas en café y en té.

ABSTRACT: Objective: Determine the color stability of a monochromatic feldspathic ceramic used in CAD / CAM system subjected to immersion in different staining solutions. Methods and materials: 90 monochromatic feldspathic ceramic discs were divided into 3 groups according to staining solution: distilled water, coffee and tea. Three color samples were taken: on days 0, 14 and 28, with a spectrophotometer. To determine the color difference (ΔE *), the 2nd and 1st measure were subtracted for the 14 days; and the 3rd and 2nd measure for the 28 days. Results: The results were interpreted using the National Standards Department Index (NBS). The sample immersed in distilled water presented values ΔE * 1,424 and ΔE * 1,233; the sample in coffee presented values ΔE * 3,327 and ΔE * 3,901; the sample immersed in tea presented values ΔE * 4,597 and ΔE * 5,201. Significant differences were obtained when comparing the chromatic stability in the three staining solutions at 14 and 28 days (p <0.001). Conclusion: There is a significant difference in the chromatic stability of a monochromatic feldspar ceramic subjected to immersion in different staining solutions. Marked color changes were obtained in the samples immersed in coffee and tea.

Exogenous application of salicylic acid to control coffee rust

The exogenous application of salicylic acid can induce plant resistance against pathogens. However, little is known about the potential uses of this bioregulator for controlling coffee diseases. In this study, we assessed the effect of applying salicylic acid (SA – 150 mg L-1) on the management of coffee rust (Hemileia vastatrix) in a 7-year-old coffee plantation with low crop load (651.6 kg ha-1 in 2017). For comparison, plants were sprayed with protectant fungicide (copper hydroxide – CH) and standard fungicides (SF) used by local farmers (boscalid, pyraclostrobin + epoxiconazole, and copper hydroxide). Non-treated plants were included as a negative control. Five monthly applications were performed from November 2016 to March 2017. Rust incidence and severity, defoliation, and growth of plagiotropic branches were evaluated monthly. The activity of catalase (CAT), ascorbate peroxidase (APX), superoxide dismutase (SOD) and total proteins was assessed one day after the first, third, and fifth product applications. Compared to untreated plants, SA reduced the severity and incidence of rust from 36.3 to 54.7%, while CH and SF reduced disease from 31.8 to 54.6% and from 83.8 to 88%, respectively. SA reduced defoliation by 54.1%. SA increased the concentration of CAT, APX, and SOD after the first application. However, this effect was not observed after subsequent applications. Foliar application of SA reduces the severity and incidence of coffee rust and defoliation in plants with a low crop load.

Efecto de la borra de café sobre la biológica espermática: aproximación in vitro / Effect of spent coffee grounds on sperm biology: in vitro approach

OBJETIVO: El objetivo de este trabajo fue establecer el efecto de la borra de café sobre la movilidad y los parámetros funcionales de los espermatozoides humanos in vitro. MATERIALES Y MÉTODOS: La borra de café, un subproducto obtenido en establecimientos especializados en la preparación de café soluble a base de grano, se diluyo en tampón fosfato salino y se mezcló en proporciones iguales con las muestras de semen de 16 voluntarios aparentemente sanos. A cada muestra se le determinó el efecto sobre la movilidad espermática en función del tiempo (30, 60, 90 y 120 minutos, n=16) y sobre los parámetros funcionales (n=6) por medio de citometría de flujo: potencial de membrana mitocondrial, producción de especies reactivas de oxígeno y lipoperoxidación de la membrana espermática. RESULTADOS: La incubación de los espermatozoides con la borra de café evidencio un cambio positivo en la movilidad espermática. Adicionalmente, la incubación con la borra de café incremento significativamente el potencial de membrana mitocondrial en los espermatozoides. CONCLUSIÓN: La borra de café, seguramente debido a los compuestos antioxidantes, afecta positivamente la movilidad espermática aumentando el potencial de membrana mitocondrial. Por lo tanto, esto es un paso inicial en la búsqueda de un suplemento de origen natural que aumente la calidad seminal.

OBJECTIVE: The objective of this work is to establish the effect of spent coffee grounds on the motility and functional parameters of human spermatozoa, in vitro. MATERIALS AND METHODS: Spent coffee grounds, a by-product obtained in specialized establishments in the preparation of soluble coffee based on grain, was diluted in saline phosphate buffer and mixed in equal proportions with semen samples from 16 apparently healthy volunteers. Each sample was determined the effect on sperm motility as a function of time (30, 60, 90 and 120 minutes, n=16) and on functional parameters (n=6) by means of flow cytometry: mitochondrial membrane potential, reactive oxygen species production and membrane lipoperoxidation. RESULTS: The incubation of the spermatozoa with the spent coffee grounds showed a positive change in sperm motility. Additionally, incubation with spent coffee grounds significantly increased the mitochondrial membrane potential in human sperm cells. CONCLUSION: Spent coffee grounds, probably due to antioxidant compounds, positively affects sperm motility by increasing mitochondrial membrane potential. Therefore, this is an initial step in the search for a supplement of natural origin that increases seminal quality.

Characterization of Roasted Coffea arabica Species by the Relationship Between Caffeine and Diterpenes Contents

Abstract Commercial roasted and ground coffees are usually blends of Coffea arabica and Coffea canephora. Considering the differences in price and sensory characteristics between these two species, the identification of the presence of each species in commercial blends is of great interest. The aim of this study was to describe typical profiles of caffeine and diterpenes (kahweol and cafestol) contents and the ratios among these compounds to support the characterization of Coffea species in roasted coffees. 32 good cup quality Brazilian C. arabica coffees (from coffee quality contests) produced using different postharvest treatments were studied. All analysis were performed by HPLC. Higher ranges were observed in diterpene contents - kahweol varied from 1.75 to 10.68 g/kg (coefficient of variation of 510%) and cafestol from 1.76 to 9.66 g/kg (449%) - than caffeine, that varied from 5.1 to 16.2 g/kg (coefficient of variation of 218%). Wide ranges of the kahweol/cafestol ratio (0.63 to 2.77) and the caffeine/kahweol ratio (0.84 to 5.15) were also observed. Hence it was proposed the additional use of a new parameter, the ratio of caffeine/sum of diterpenes (kahweol + cafestol) that presents values from 0.54 to 2.39. The results indicated that the combined use of these parameters could be a potential tool for discriminating Coffea species in blends of roasted and ground coffee. It was proposed as potentially indicative of C. arabica: values of kahweol/cafestol ratio above 0.50, associated with caffeine/kahweol ratio lower than 5.50 and caffeine/sum of diterpenes ratio lower than 2.50.

Desenvolvimento de bebida tipo “café com leite” à base de extrato de café e extrato de soja e sua caracterização físico-química / Development of "coffee with milk" type drink based on extract of coffee and soybean extract and its physical-chemical characterization

O café é uma bebida muito consumida mundialmente, sendo apreciada pelas características sensoriais e estimulantes. Sua qualidade está associada a fatores, como a composição química dos grãos e seu processamento (torra e extração). O extrato de soja é uma bebida nutritiva e saudável, porém não faz parte do hábito alimentar da maioria dos brasileiros, devido ao sabor característico de “beany flavor”. O aumento de pessoas com restrições ao consumo de leite e seus derivados, levou a desenvolvimento uma bebida à base de extrato de café (EC) e extrato de soja (ES), semelhante ao clássico “café com leite". A analise de aceitação sensorial levou a formulação de ES com 3% EC. A bebida foi submetida à liofilização e após o processamento realizou-se a caracterização físico-química e analise de minerais dos extratos puros e da bebida final.

Effects of Coffee Intake and Intraperitoneal Caffeine on Bone Repair Process - A Histologic and Histometric Study

Studies have suggested that caffeine acts on bone promoting an increase of calcium excretion, inhibition of osteoblast proliferation and delay in tissue repair process, raising the risk of fractures, osteoporosis, periodontal disease and affecting the success of bone reconstructive procedures. The aim of this study was to analyze histomorphometrically the process of alveolar bone healing after tooth extraction in rats subjected to daily intake of boiled coffee or intraperitoneal administration of caffeine. Forty-five male rats were divided according to the treatment in Control group (C); Coffee group (CO) - treated with coffee since birth; and Caffeine (CAF) - intraperitoneal injection of aqueous solution of caffeine 1.5% (0.2 mL/100g body weight) for 30 days. When weighing between 250-300 g they were anesthetized, subjected to extraction of the maxillary right incisor, and euthanized 7, 21 and 42 days after surgery for histological assessments of bone volume and the quality of formed bone in the dental socket. The qualitative results demonstrated larger amounts of blood clot and immature bone in animals under treatment of pure caffeine compared to coffee and control. Histometric analysis revealed that coffee treatment led to a 40% drop in bone formation, and caffeine a 60% drop in comparison to control animals (ANOVA p≤0.01). It was concluded that both the daily ingestion of coffee and the intraperitoneal administration of caffeine in rats delayed the alveolar bone reparative process after tooth extraction, and this effect was more aggressive when pure caffeine was used.

Estudos têm sugerido que a cafeína age sobre o osso promovendo um aumento da excreção de cálcio, inibição da proliferação dos osteoblastos e retardo no processo de reparação tecidual, aumentando o risco de fraturas, osteoporose, doença periodontal, bem como afetando o sucesso de procedimentos de reconstrução óssea. O objetivo deste estudo foi analisar histomorfometricamente o processo de reparação óssea alveolar após extração dentária em ratos submetidos à ingestão diária de café fervido ou a administração intraperitoneal de cafeína. 45 ratos machos foram divididos de acordo com o tratamento, em controle (C); café (CO), tratados com café desde o nascimento; e cafeína (CAF), injeção intraperitoneal de solução aquosa de cafeína de 1,5 % (0,2 mL/100 g de peso corporal) durante 30 dias. Quando pesavam entre 250-300 g os animais foram anestesiados, submetidos à extração do incisivo superior direito, e sacrificados em 7, 21 e 42 dias após a cirurgia para análises histológicas quanto ao volume e à qualidade do osso formado no alvéolo dental. Os resultados qualitativos demonstraram grandes quantidades de coágulo sanguíneo e osso imaturo nos animais tratados com cafeína pura, em relação aos grupos café e controle. A avaliação histométrica mostrou que o tratamento com o café levou a uma queda na formação óssea de 40%, e com a cafeína de 60% em comparação ao grupo controle (ANOVA p≤0,01). Concluiu-se que tanto a ingestão diária de café quanto a administração intraperitoneal de cafeína em ratos retardou o processo de reparação do osso alveolar após extração dentária, e este efeito é mais agressivo quando do uso da cafeína pura.

Activities of different types of Thai honey on pathogenic bacteria causing skin diseases, tyrosinase enzyme and generating free radicals

BACKGROUND: Honey is a natural product obtained from the nectar that is collected from flowers by bees. It has several properties, including those of being food and supplementary diet, and it can be used in cosmetic products. Honey imparts pharmaceutical properties since it has antibacterial and antioxidant activities. The antibacterial and antioxidant activities of Thai honey were investigated in this study. RESULTS: The honey from longan flower (source No. 1) gave the highest activity on MRSA when compared to the other types of honey, with a minimum inhibitory concentration of 12.5% (v/v) and minimum bactericidal concentration of 25% (v/v). Moreover, it was found that MRSA isolate 49 and S. aureus were completely inhibited by the 50% (v/v) longan honey (source No. 1) at 8 and 20 hours of treatment, respectively. Furthermore, it was observed that the honey from coffee pollen (source No. 4) showed the highest phenolic and flavonoid compounds by 734.76 mg gallic/kg of honey and 178.31 mg quercetin/kg of honey, respectively. The antioxidant activity of the honey obtained from coffee pollen was also found to be the highest, when investigated using FRAP and DPPH assay, with 1781.77 mg FeSO4•7H2O/kg of honey and 86.20 mg gallic/kg of honey, respectively. Additionally, inhibition of tyrosinase enzyme was found that honey from coffee flower showed highest inhibition by 63.46%. CONCLUSIONS: Honey demonstrates tremendous potential as a useful source that provides anti-free radicals, anti-tyrosinase and anti-bacterial activity against pathogenic bacteria causing skin diseases.

Effect of coffe and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching

There is no consensus about the waiting time necessary for the patient to start consuming beverages containing colorants again after bleaching. Objective: To evaluate the influence of beverages with coloring agents on bleached bovine incisors considering the time elapsed after bleaching. Materials and methods: Sixty bovine incisors were bleached with 35% hydrogen peroxide for in-office use (Whiteness HP Max) and divided into 10 groups. The color was evaluated with a spectrophotometer (Spectro Shade MICRO) before and after bleaching, employing the CIE-Lab system. After bleaching, the teeth were exposed for 5 min to coffee or cola-based soft drink (CBSD) at different periods after bleaching: 10 min, 1 h, 24 h, 48 h, and 72 h. Color (∆E) and lightness (∆L) variations were obtained from the CIE-Lab coordinates. Data were subjected to two-way ANOVA and Tukey HSD tests (p<0.05). Results: Significant differences were observed between groups for both the ∆L and ∆E values (p<0.001). All specimens presented a decrease in brightness (negative ∆L). The highest ∆E values were observed for teeth stained with a CBSD at 10 min and 1 h (4.12 and 4.16, respectively). Teeth pigmented with coffee presented ∆E values below 3.3 units for all evaluation times. Conclusion: The exposure to coffee after bleaching causes less color changes than the exposure to a CBSD regardless of the time after bleaching. .

In vitro study of color stability of polycrystalline and monocrystalline ceramic brackets

OBJECTIVE: The aim of this in vitro study was to analyze color stability of monocrystalline and polycrystalline ceramic brackets after immersion in dye solutions. METHODS: Seven ceramic brackets of four commercial brands were tested: Two monocrystalline and two polycrystalline. The brackets were immersed in four dye solutions (coffee, red wine, Coke and black tea) and in artificial saliva for the following times: 24 hours, 7, 14 and 21 days, respectively. Color changes were measured by a spectrophotometer. Data were assessed by Multivariate Profile Analysis, Analysis of Variance (ANOVA) and Multiple Comparison Tests of means. RESULTS: There was a perceptible change of color in all ceramic brackets immersed in coffee (ΔE* Allure = 7.61, Inspire Ice = 6.09, Radiance = 6.69, Transcend = 7.44), black tea (ΔE* Allure = 6.24, Inspire Ice = 5.21, Radiance = 6.51, Transcend = 6.14) and red wine (ΔE* Allure = 6.49, Inspire Ice = 4.76, Radiance = 5.19, Transcend = 5.64), but no change was noticed in Coke and artificial saliva (ΔE < 3.7). CONCLUSION: Ceramic brackets undergo color change when exposed to solutions of coffee, black tea and red wine. However, the same crystalline structure, either monocrystalline or polycrystalline, do not follow the same or a similar pattern in color change, varying according to the bracket fabrication, which shows a lack of standardization in the manufacturing process. Coffee dye produced the most marked color changes after 21 days of immersion for most ceramic brackets evaluated. .

OBJETIVO: esse estudo objetivou analisar, in vitro, a estabilidade de cor de braquetes cerâmicos monocristalinos e policristalinos após imersão em soluções corantes. MÉTODOS: sete braquetes cerâmicos de incisivo central superior direito, de quatro marcas comerciais, foram testados: dois monocristalinos e dois policristalinos. Os braquetes foram imersos em quatro soluções corantes (café, vinho tinto, Coca-Cola e chá preto) e em saliva artificial, separadamente, nos seguintes tempos: 24 horas, 7, 14 e 21 dias. As alterações de cor foram mensuradas por espectrofotômetro de refletância. Os dados foram avaliados pela Análise de Perfis Multivariados, Análise de Variância e teste de comparação múltipla de médias. RESULTADOS: houve alteração perceptível de cor em todos os braquetes cerâmicos após 21 dias de imersão nas soluções de café (ΔE* Allure = 7,61; Inspire Ice = 6,09; Radiance = 6,69; Transcend = 7,44), chá preto (ΔE* Allure = 6,24; Inspire Ice = 5,21; Radiance = 6,51; Transcend = 6,14) e vinho tinto (ΔE* Allure = 6,49; Inspire Ice = 4,76; Radiance = 5,19; Transcend = 5,64), porém, a alteração não foi perceptível para a Coca-Cola e saliva artificial (ΔE* < 3,7). CONCLUSÃO: braquetes cerâmicos sofrem alteração de cor quando em contato com café, chá preto e vinho tinto. No entanto, os braquetes de mesma constituição cristalina, sejam monocristalinos ou policristalinos, não seguem um padrão semelhante de alteração de cor, mas variam de acordo com o fabricante, o que mostra uma falta de padronização no processo de produção desses braquetes. O café foi a solução corante que mais produziu alteração de cor após 21 dias ...

Coffee has hepatoprotective benefits in Brazilian patients with chronic hepatitis C even in lower daily consumption than in American and European populations

The potential role of coffee as a hepatoprotective substance for chronic liver diseases has been widely discussed. Our main aim was to evaluate the effect of coffee intake regarding clinical, biochemical tests and liver biopsy data in treatment naïve patients with chronic hepatitis C. One hundred and thirty-six patients with chronic hepatitis C, diagnosed through liver biopsy, or by means of clinical, ultrasound or endoscopic signs of cirrhosis, were assessed by determination of biochemical tests, metabolic and morphological alterations. Food frequency was scrutinized by using a structured questionnaire. Coffee intake represented more than 90% of the total daily caffeine, and the 75th percentile was 4-Brazilian coffee-cup/day (>255mL/day or >123mg caffeine/day). According to caffeine intake, patients were divided into two groups (< or >123mg caffeine/day). Patients with higher ingestion of caffeine had lower serum levels of aspartate aminotransferase (× upper limit of normal) (1.8±1.5 vs 2.3±1.5, p=0.04), lower frequencies of advanced (F3, F4) fibrosis (23.5% vs 54.5%, p<0.001) and of histological activity grade (A3, A4) observed in liver biopsies (13.8% vs 36.9%, p<0.001). By multivariate logistic regression, fibrosis was independently associated with caffeine intake (OR- 0.16; 95%CI - 0.03-0.80; p=0.026), γ-glutamil transferase serum levels and morphological activity. But only fibrosis was associated with histological activity. In conclusion caffeine consumption greater than 123mg/day was associated with reduced hepatic fibrosis. In addition, this study supports the assumption that coffee intake has hepatoprotective benefits for Brazilian patients with chronic hepatitis C, even in lower doses than that of American and European population intake.

Niveles de Ocratoxina A y Aflatoxinas totales en cafés de exportación de Panamá por un método de ELISA

Se realizó un estudio de las condiciones del procesamiento del café de exportación en 15 beneficios, ubicados en Chiriquí, región occidental de Panamá. Además se analizaron 21 muestras de café procesado (grano verde), provenientes de los beneficios. Las muestras fueron analizadas microbiológicamente y se cuantificaron las Aflatoxinas totales (B1, B2, G1 y G2) y Ocratoxina A (OTA), mediante el método de inmunoafinidad ELISA. Se determinó un límite de detección de 0,017 ng/mL, para la Ocratoxina A, lo que equivale a una concentración de 0,829 μg/kg en la muestra, y un límite de detección de 0,027 ng/mL, para las Aflatoxinas totales, lo que equivale a una concentración de 1,350 μg/kg de Aflatoxinas totales. En la muestra, se encontró que cuatro de las 21 (19%) resultaron positivas a la presencia de Ocratoxina A y tres, a la presencia de Aflatoxinas totales (14%). Las muestras presentaron niveles de Ocratoxina A en el rango de 4,90-37,73 μg/kg; sólo tres de ellas superaron el límite máximo permitido por la Unión Europea, para la concentración de Ocratoxina, que es de 5,0 μg/kg. Las Aflatoxinas totales se encontraron en el rango de 1,51- 1,93 μg/kg, por debajo de los 10 μg/kg, que es el límite máximo permitido en el café por la Unión Europea. Los resultados nos indican que el procesamiento de café producido en Panamá cumple satisfactoriamente con los estándares internacionales de manejo poscosecha, lo que conduce a una baja incidencia de hongos productores de micotoxinas y niveles muy bajos de micotoxinas.

Levels of Ochratoxin A and total Aflatoxins in Panamanian exportation coffee by an ELISA Method. A study about processing conditions of exportation coffee in 15 benefits located in Chiriquí, western region of Panama, was conducted. In addition, 21 samples of processed coffee (green beans), from the benefits, were analyzed. The samples were microbiologically tested in order to quantify total aflatoxins (B1, B2, G1 and G2) and Ochratoxin A (OTA), using the immunoaffinity ELISA method. A detection limit of 0.017 ng/mL, was determined for Ochratoxin A, which is equivalent to a concentration of 0.829 μg/kg, and a detection limit of 0.027 ng/mL, for total aflatoxins, which is equivalent to a concentration of 1.350 μg/kg. It was found that four (19%) out of the 21 samples were positive to the presence of Ochratoxin A and three (14%) to the presence of total aflatoxins. Samples showed levels of Ochratoxin A in the range 4.90 - 37.73 μg/kg; only three of them exceeded the maximum limit allowed by the European Union, for the concentration of Ochratoxin, which is of 5.0 μg/kg. Total aflatoxins were found in the range 1.51 - 1.93 μg/kg, below 10μg/kg which is the maximum limit allowed for coffee by the European Union. The results indicate that the processing of coffee produced in Panama successfully meets international standards for postharvest handling, which leads to a low incidence of mycotoxins and very low levels of mycotoxin- producing fungi.

Validação de metodologias e determinação da composição de fitosteróis em cremes vegetais, farináceos e cafés comercializados em São Paulo. / Determinação da composição de fitosteróis em cremes vegetais, farináceos e cafés comercializados em São Paulo [título original] / Validation of methodologies and determination of phytosterols composition in vegetable creams, farinaceous and coffees commercialized in Sao Paulo

Os fitosteróis (FS) são esteróis de origem vegetal, reconhecidos como componentes funcionais devido ao seu papel hipocolesterolêmico. A recomendação de ingestão diária desses compostos é de 1,6 a 2 g/dia, no entanto há poucos estudos que avaliem os teores desses compostos em alimentos, sendo necessária sua quantificação. Objetivo - O objetivo deste projeto foi desenvolver uma metodologia e determinar os teores de FS em alguns alimentos usualmente consumidos e comercializados em São Paulo. Metodologia Foram avaliadas amostras de creme vegetal sem sal (in natura, e aquecidas a 100o C e 140o C), dos farináceos: farinha de trigo, farinha de milho, farinha de mandioca, amido de milho, café em pó (torras: tradicional, forte e extraforte, descafeinado e gourmet), café solúvel instantâneo, cappuccino e da bebida coada. As amostras, em triplicata, foram submetidas ao processo de saponificação a frio e a matéria insaponificável extraída foi derivatizada e posteriormente injetada em cromatógrafo gasoso. Resultados Os principais FS encontrados foram: -Sitosterol, campesterol e estigmasterol. As maiores médias de teores de FS foram encontradas nos cremes vegetais (186,2 ± 21,7 mg /100g) e nos pós de café moído (92,24 ± 3,95 mg /100g). As farinhas apresentaram teores intermediários, 42,27 ± 7,09 mg /100g; 35,10 ± 10,49 mg /100g; 22,02 ± 1,22 mg /100g; 14,33 ± 3,07 mg /100g para farinha de rosca, milho, trigo e mandioca, respectivamente. As amostras cappuccino (5,73 ± 0,78 mg /100g), café solúvel (4,03 ± 0,84 mg /100g) e amido de milho (3,55 ± 0,8 mg /100g) foram as apresentaram menores teores de FS...

Phytosterols (PS) are plant sterols, known as functional components due to its hypocholesterolemic role. The recommendation for daily intake of these compounds is 1.6-2 g/day, however there are few studies that evaluate the content of these compounds in foods, requiring its quantification. Objective: the objective of this project was to develop a methodology and determine the content of PS in some foods usually consumed and traded in Sao Paulo. Methodology: Were evaluated samples of: unsalted vegetable cream (in natura, and heated to 100oC and 140oC), farinaceous: wheat, corn and cassava flour, breadcrumbs and cornstarch, powdered coffee (roasts: traditional, strong and extra strong, decaffeinated and gourmet), instant coffee, cappuccino and strained drink coffee. Samples in triplicate were subjected to cold saponification process and unsaponificable matter was extracted, derivatized and subsequently injected into the gas chromatograph. Results: The main PS founded in the samples were: -sitosterol, campesterol and stigmasterol. The highest average levels of PS were found in vegetable creams (186.2 ± 21.7 mg / 100g) and powdered coffee (92.24 ± 3.95 mg / 100g). Farinaceous had intermediate levels, 42.27 ± 7.09 mg / 100g; 35.10 ± 10.49 mg / 100g; 22.02 ± 1.22 mg / 100g; 14.33 ± 3.07 mg / 100g for breadcrumbs, corn, and wheat and cassava flour, respectively. Cappuccino samples (5.73 ± 0.78 mg / 100g), soluble coffee (4.03 ± 0.84 mg / 100g) and corn starch (3.55 ± 0.8 mg / 100g) showed lower levels of PS...

Antioxidant capacity, phenolic acids and caffeine contents of some commercial coffees available on the Romanian market / Capacidad antioxidante, contenido de ácidos fenólicos y cafeína de algunos tipos de café disponibles en el mercado de Rumania

In the present study a simple and highly sensitive RP-HPLC method has been established for simultaneous determination of chlorogenic acid, caffeic acid, vanillic acid and caffeine in coffee samples. The method has been applied to eight different coffees available on the Romanian market which were previously analysed concerning the total polyphenols content and antioxidant capacity. Reduction of the DPPH radical was used to determine the antioxidant capacity of the coffee extracts while the total polyphenols content was determined by spectrophotometry (Folin Ciocalteu's method). The total polyphenols content ranged from 1.98 g GAE/100 g to 4.19 g GAE/100 g while the caffeine content ranged from 1.89 g/100 g to 3.05 g/100 g. A large variability was observed in chlorogenic acid content of the investigated coffee samples which ranged between 0.6 and 2.32 g/100 g.

En este trabajo, un método sensible RPHPLC fue desarrollado para la determinación simultánea del ácido clorogénico, del ácido cafeico, del ácido vanílico y de la cafeína en las pruebas de café. El método fue aplicado para analizar ocho tipos de café disponibles en el mercado de Rumania, que fueron analizados también en cuanto al contenido total de polifenoles y la capacidad antioxidante. La reducción del radical DPPH fue utilizada para determinar la capacidad antioxidante de los extractos de café mientras que el contenido total de polifenoles fue determinado por la espectrofotometría (método Folin Ciocalteu). El contenido total de polifenoles se situó entre 1,98 g GAE/100 g y 4.19 g GAE/100 g mientras que el contenido de cafeína se situó entre 1.89 g/100 g y 3.05 g/100 g. Una gran variabilidad se observó con respecto al contenido de ácido clorogénico en las pruebas de café analizadas, contenido que se situó entre 0.6 y 2.32 g/100 g.

CARACTERÍSTICAS FÍSICAS E QUÍMICAS DE CAFÉS TORRADOS E MOÍDOS EXÓTICOS E CONVENCIONAIS / PHYSICAL AND CHEMICAL CHARACTERISTICS OF EXOTIC AND CONVENTIONAL ROASTED AND GROUND COFFEES

O presente trabalho refere-se à pesquisa de dois cafés exóticos comercializados no Brasil: o café Jacu, proveniente do estado de Espírito Santo, e o café Civeta procedente da Indonésia (cujos frutos maduros são ingeridos e "processados" no trato digestivo de animais). Suas características químicas e físicas foram comparadas às de cafés torrados e moídos comerciais brasileiros (Tradicional, Superior ou Premium e Gourmet). Os valores referentes à composição centesimal, teor de cafeína (1,04 a 1,45%) e sólidos solúveis totais (24,50 a 32,23%) de todas as amostras atenderam aos limites preconizados pela legislação brasileira. Os cafés exóticos, Jacu e Civeta, apresentaram os maiores e menores parâmetros de cor, respectivamente (L* = 20,46 e 11,55; h* = 58,13 e 51,06 e C* = 21,00 e 14,85). Os maiores teores (média de 35,21 mg em equivalente de ácido gálico/g amostra) de compostos fenólicos totais foram verificados nos cafés Tradicional e Premium. Os cafés Jacu e Gourmet apresentaram os maiores teores de 5-ACQ (média de 0,65%) e de trigonelina (média 0,63 g/100 g amostra) e os menores teores de ácido nicotínico (média de 0,022 g/100 g amostra). O café Premium continha os maiores teores de açúcar total (1,37 g glicose/100 g amostra) e o café Tradicional mostrou o maior teor de açúcares redutores (0,27 g sacarose/100 g amostra). O café Gourmet apresentou a maior acidez titulável total (171,13 mL NaOH 0,1 N/100 g amostra) e o Premium a menor (121,31 mL NaOH 0,1 N/100 g amostra).

Efeito dos resíduos de café seco e fermentado por Monascus ruber no metabolismo de camundongos Apo E / Effect of dry coffee residues fermented with Monascus ruber on the metabolism of Apo E mice

FUNDAMENTO: A aterosclerose é uma doença inflamatória crônica de origem multifatorial que ocorre em resposta à agressão endotelial. O fungo Monascus ruber apresenta atividade hipocolesterolêmica e polifenóis presentes no resíduo de café apresentam atividade antioxidante, podendo auxiliar na prevenção de doenças cardiovasculares. O resíduo de café possui quantidade significativa de açúcares fermentescíveis, constituindo-se em substrato apropriado para o cultivo de fungos. OBJETIVO: O objetivo deste estudo foi avaliar o efeito dos resíduos de café seco e fermentado por Monascus ruber no metabolismo lipídico de camundongos knockout Apo E. MÉTODOS: O ensaio biológico foi realizado com 30 camundongos knockout para o gene Apo E, divididos em cinco grupos e submetidos a diferentes tratamentos. Foi realizada a prospecção fitoquímica e quantificação de compostos fenólicos dos resíduos fermentado e sem fermentar. O soro dos animais foi analisado utilizando kits enzimáticos e o tecido aórtico incluso em parafina e corado com H/E para realização da análise histopatológica. RESULTADOS: O resíduo de café sem fermentar 2%, em relação ao grupo controle, diminuiu em 42% o nível sérico de triacilgliceróis e em aproximadamente 41% a fração VLDL-c. Os grupos dos animais alimentados com 10% de resíduo não fermentado e 2% de resíduo fermentado diminuíram a área de lesão 10,5% e 15,4%, respectivamente, quando comparados ao controle. O resíduo fermentado apresentou um teor de compostos fenólicos superior ao resíduo não fermentado. CONCLUSÃO: O presente estudo mostra que a fermentação do resíduo de café apresenta potencial efeito benéfico sobre as doenças cardiovasculares, especialmente a aterosclerose.

BACKGROUND: Atherosclerosis is a chronic inflammatory disease of multifactorial origin, which occurs in response to endothelial injury. The fungus Monascus ruber has hypocholesterolemic activity, and the polyphenols present in coffee residue have an antioxidant activity and can help prevent cardiovascular diseases. Coffee residue has a significant amount of fermentable sugars, being an adequate substrate for growing fungi. OBJECTIVE: The objective of this study was to assess the effect of dry coffee residue fermented with Monascus ruber on the lipid metabolism of ApoE knockout mice. METHODS: The biological assay was performed with 30 ApoE knockout mice, divided into five groups and undergoing different treatments. The phytochemical prospection and quantification of phenolic compounds of the fermented and non-fermented coffee residues were performed. The sera of the animals were analyzed by using enzyme kits, and the aortic tissue was embedded in paraffin and stained with hematoxylin and eosin to undergo histopathological analysis. RESULTS: Comparing with the control group, the group receiving 2% non-fermented coffee residue showed a reduction of 42% in the serum levels of triacylglycerols and of approximately 41% in VLDL-c. The groups receiving 10% non-fermented coffee residue and 2% fermented coffee residue showed reductions in the lesion areas of 10.5% and 15.4%, respectively, as compared with the control group. The fermented coffee residue showed a higher content of phenolic compounds as compared with the non-fermented coffee residue. CONCLUSION: The present study showed that coffee residue fermentation has a potentially beneficial effect on cardiovascular diseases, especially atherosclerosis.

Changes in surface roughness and color stability of two composites caused by different bleaching agents

The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

O objetivo deste estudo foi avaliar o efeito de dois agentes clareadores (peróxido de hidrogênio a 10% e 35%) sobre a estabilidade de cor e rugosidade superficial de dois compósitos, um nanohíbrido e um nanoparticulado. Os espécimes foram polidos, envelhecidos, manchados, clareados e polidos novamente. A ação dos agentes clareadores sobre os compósitos foi analisada em perfilômetro (rugosidade) e um espectrofotômetro (estabilidade de cor). A ação de polimento dos compósitos sobre a rugosidade superficial e a retomada da cor dos compósitos também foi avaliada. Os resultados foram analisados estatisticamente por ANOVA e teste de Tukey (5% de significância). A análise indicou que o compósito nanohíbrido foi mais afetado pelo manchamento. Os agentes clareadores não foram capazes de promover o clareamento dos compósitos ao longo do período de avaliação. O polimento da superfície retornou o compósito nanohíbrido à sua condição de cor original, o que não foi observado para o nanoparticulado. Além disso, o polimento não retornou a rugosidade de superfície dos compósitos para os valores originais. Os autores concluíram que o polimento da superfície após o clareamento não deve ser a opção de tratamento, uma vez que não foi possível inverter a rugosidade dos compósitos à sua rugosidade original, sugerindo que uma degradação mais extensa e irreversível pode ter ocorrido.

Café e saúde humana: um enfoque nas substâncias presentes na bebida relacionadas às doenças cardiovasculares / Coffee and human health: a focus on the substances of the beverage related to cardiovascular disease

O café é a bebida mais consumida no Brasil e no mundo ocidental. O fato de ser uma bebida tão popular, aliado à sua importância econômica, explica o interesse por estudos sobre o café, desde a sua composição até seus efeitos na saúde humana. Dentre as diversas substâncias presentes na composição química do café, além dos nutrientes, destacam-se a cafeína, os diterpenos cafestol e kahweol e os ácidos clorogênicos, o que faz do café uma importante fonte dietética destes compostos. Muitos estudos têm verificado a influência de seus constituintes na saúde, principalmente a cafeína vs a elevação da pressão arterial; o cafestol e o kahweol vs a dislipidemia; e ácidos clorogênicos vs proteção cardiovascular, por suas propriedades antioxidantes. Este artigo tem como objetivo apresentar de forma sucinta a importância da bebida e sua composição química, os mecanismos fisiológicos envolvidos na elevação da pressão arterial e do colesterol sérico atribuíveis ao café, bem como estudos selecionados que verificaram a associação do consumo da bebida com estas doenças cardiovasculares.

Coffee is the most consumed beverage in the Western world, including Brazil. The fact that it is one the most popular beverages and its worldwide consumption and economic importance explain the interest for studies on coffee, from its composition to its effects on human health. In addition to the nutrients, its various components include caffeine, the diterpenes cafestol and kahweol, and chlorogenic acids, with coffee being an important dietary source of these compounds. Many studies have verified the association between its constituents and health, especially caffeine and high blood pressure, cafestol and kahweol and dyslipidemias, and chlorogenic acids and cardiovascular protection from their antioxidant properties. This article aims to succinctly present the importance and composition of the drink, the physiological mechanisms involved in the increased blood pressure and serum cholesterol attributed to coffee, and selected studies that verified the association between coffee consumption and these cardiovascular diseases.

Effect of ageing and immersion in different beverages on properties of denture lining materials

OBJECTIVES: To evaluate the color stability and hardness of two denture liners obtained by direct and indirect techniques, after thermal cycling and immersion in beverages that can cause staining of teeth. MATERIAL AND METHODS: Seventy disc-shaped specimens (18 x 3 mm) processed by direct (DT) and indirect techniques (IT) were made from Elite soft (n=35) and Kooliner (n=35) denture liners. For each material and technique, 10 specimens were subjected to thermal cycling (3,000 cycles) and 25 specimens were stored in water, coffee, tea, soda and red wine for 36 days. The values of color change, Shore A hardness (Elite soft) and Knoop hardness (Kooliner) were obtained. The data were subjected to ANOVA, Tukey's multiple-comparison test, and Kruskal-Wallis test (P<0.05). RESULTS: The thermal cycling promoted a decrease on hardness of Kooliner regardless of the technique used (Initial: 9.09± 1.61; Thermal cycling: 7.77± 1.47) and promoted an increase in the hardness in the DT for Elite Soft (Initial: 40.63± 1.07; Thermal cycling: 43.53± 1.03); hardness of Kooliner (DT: 8.76± 0.95; IT: 7.70± 1.62) and Elite Soft (DT: 42.75± 1.54; IT=39.30± 2.31) from the DT suffered an increase after the immersion in the beverages. The thermal cycling promoted color change only for Kooliner in the IT. Immersion in the beverages did not promote color change for Elite in both techniques. The control group of the DT of Kooliner showed a significant color change. Wine and coffee produced the greatest color change in the DT only for Elite Soft when compared to the other beverages. CONCLUSION: The three variation factors promoted alteration on hardness and color of the tested denture lining materials.

Effect of staining solutions and repolishing on color stability of direct composites

OBJECTIVES: The purpose of this study was to assess the color change of three types of composite resins exposed to coffee and cola drink, and the effect of repolishing on the color stability of these composites after staining. MATERIALS AND METHODS: Fifteen specimens (15 mm diameter and 2 mm thick) were fabricated from microhybrid (Esthet-X; Dentsply and Filtek Z-250; 3M ESPE) and high-density hybrid (Surefil; Dentsply) composites, and were finished and polished with aluminum oxide discs (Sof-Lex; 3M ESPE). Color of the specimens was measured according to the CIE L*a*b* system in a refection spectrophotometer (PCB 6807; BYK Gardner). After baseline color measurements, 5 specimens of each resin were immersed in different staining solutions for 15 days: G1 - distilled water (control), G2 - coffee, G3 - cola soft drink. Afterwards, new color measurement was performed and the specimens were repolished and submitted to new color reading. Color stability was determined by the difference (ΔE) between the coordinates L*, a*, and b* obtained from the specimens before and after immersion into the solutions and after repolishing. RESULTS: There was no statistically signifcant difference (ANOVA, Tukey's test; p>0.05) among the ΔE values for the different types of composites after staining or repolishing. For all composite resins, coffee promoted more color change (ΔE>3.3) than distilled water and the cola soft drink. After repolishing, the ΔE values of the specimens immersed in coffee decreased to clinically acceptable values (ΔE<3.3), but remained signifcantly higher than those of the other groups. CONCLUSIONS: No signifcant difference was found among composite resins or between color values before and after repolishing of specimens immersed in distilled water and cola. Immersing specimens in coffee caused greater color change in all types of composite resins tested in this study and repolishing contributed to decrease staining to clinically acceptable ΔE values.

Atividade anticariogênica de extratos e compostos químicos do café / Anticariogenic activity of coffee extracts and coffee chemical compounds

Avaliou-se a atividade anticariogênica de extratos e compostos químicos docafé, através de dois estudos laboratoriais. No primeiro, foram testados grãos integrais e descafeinados das espécies Coffea arabica e Coffea canephora, emdiferentes graus de torrefação (6, 7, 8, 13 e 15 minutos), totalizando 36extratos. Os extratos e 6 constituintes químicos presentes em ambas asespécies (ácido clorogênico – 5-CQA; ácido caféico, trigonelina, cafeína, ácidonicotínico e ácido ferúlico) foram submetidos a ensaios de susceptibilidade microbiológica. Assim, pode-se identificar a concentração mínima destas substâncias necessária para inibição do crescimento (CMI) de Streptococcus mutans (SM). Em acréscimo, avaliou-se a capacidade dos extratos e compostos de inibir a formação do biofilme de cepas de SM e/ou reduzí-lo. Todos os extratos de café foram caracterizados quimicamente através de cromatografia líquida de alta eficiência e medições do pH. Os extratos integrais com tempo de torrefação entre 6 e 8 minutos (torra clara à média clara), assim como os descafeinados com tempo de torra de 6 e 7 minutos, apresentaram o mesmo valor de CMI (5 mg/mL). Trigonelina, 5-CQA e ácido caféico demonstraram uma CMI de 0,8 mg/mL. O extrato de C. canephora com 6 minutos de torra e de qualidade superior dos grãos obteve os melhores resultados na inibição da formação do biofilme de SM (39,6%) e reduziu em 6,6% o biofilme já formado, sendo, por isso, selecionado para o segundo estudo. Experimentos foram realizados a fim de identificar a atividade antibacteriana do extrato selecionado diante do SM e do Streptococcus sobrinus (SS). A viabilidade das células planctônicas de SM e SS frente a diferentes concentrações do extrato foi analisada através de testes de suscetibilidade para verificar: a CMI, a concentração mínima bactericida (CBM) e a curva de morte das bactérias. O efeito do extrato sobre a desmineralização dentária foi investigado após a sua aplicação sobre o biofilme misto...