Methylxanthines
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. A multivariate approach to differentiate yerba mate (Ilex paraguariensis) commercialized in the southern Brazil on the basis of phenolics, methylxanthines and in vitro antioxidant activity
Abstract The consumption of yerba mate beverages is related to several health benefits. These desirable properties are mainly due to the bioactive compounds. However, the levels of those compounds are directly affected by factors such as geographical origin. This study aimed to use chemometrics to evaluate the antioxidant compounds of yerba mate (consumed as
Food Sci. Technol. Publicado em: 2020-09
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2. Paullinia cupana: a multipurpose plant - a review
Abstract Seeds of guarana (Paullinia cupana Kunth, Sapindaceae) feature diverse pharmacological functions, for example, antimicrobial, antioxidant, anticarcinogenic, stimulating, and cognitive functions, as well as liver protection and weight loss. Many of these actions are probably due to the high content of methylxanthines and tannins in its seeds. In Braz
Rev. bras. farmacogn.. Publicado em: 2019-02
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3. Influence of drying methods on cocoa (Theobroma cacao L.): antioxidant activity and presence of ochratoxin A
Abstract This work aimed to evaluate the performance of different drying methods in the development of phenolic compounds, methylxanthines, and antioxidant activity in cocoa bean and to evaluate the presence of ochratoxin A (OTA). Antioxidant activity was determined using DPPH, FRAP, ORAC and β-carotene-linoleic acid assays. Phenolic compounds and methylxa
Food Sci. Technol. Publicado em: 26/07/2018
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4. Ilex paraguariensis extracts extend the lifespan of Drosophila melanogaster fed a high-fat diet
Studies have suggested that total energy intake and diet composition affect lifespan and ageing. A high-fat diet induces oxidative stress and affects the development of diseases. In contrast, antioxidants are capable of reducing its harmful effects. Yerba mate beverages are an important source of antioxidants, but there is scarce knowledge about their effect
Braz J Med Biol Res. Publicado em: 30/11/2017
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5. Bioactive compounds in different cocoa (Theobroma cacao, L) cultivars during fermentation
One component that contribute to the flavor and aroma of chocolate are the polyphenols, which have received much attention due to their beneficial implications to human health. Besides bioactive action, polyphenols and methylxantines are responsible for astringency and bitterness in cocoa beans. Another important point is its drastic reduction during cocoa p
Food Sci. Technol. Publicado em: 2015-04
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6. The influence of leaf age on methylxanthines, total phenolic content, and free radical scavenging capacity of Ilex paraguariensis aqueous extracts
Yerba-mate (Ilex paraguariensis A. St. Hil., Aquifoliaceae) is a South American native species that is widely used for its industrial potential in the preparation of drinks, teas and cosmetics. Its properties are directly related to the presence of its chemical constituents, such as saponins, methylxanthines and phenolic compounds. This study aimed to invest
Rev. bras. farmacogn.. Publicado em: 2015-02
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7. Análise metabolômica via RMN: amostras de urina e látex / Metabolomic analyses by NMR: urine and latex samples
The aim of the first part of this work was to apply the concept of metabolomic analyses in urine samples obtained from humans diagnosed with type 2 diabetes mellitus (T2DM) and impaired glucose tolerance (IGT) and treated with yerba-mate (Ilex paraguariensis) infusions using nuclear magnetic resonance. T2DM is the most recurrent type of diabetes and correspo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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8. Quantitative genetic analysis of methylxanthines and phenolic compounds in mate progenies
2010
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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9. Caffeine degradation in leaves and fruits of coffea arabica and coffea dewevrei.
The coffee species Coffea dewevrei and Coffea arabica have marked differences in caffeine metabolism and the control of the caffeine content during fruit ripening and leaf aging is still not clear. The aim of this work was a detailed investigation on the alkaloid degradation in young and aged leaves, and immature and mature fruits of these species. Young and
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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10. Methylxanthines accumulation in Ilex species: caffeine and theobromine in erva-mate (Ilex paraguariensis) and other Ilex species
Ilex paraguariensis St.Hil. é uma espécie de importância econômica tendo em vista sua utilização na região meridional da América do Sul no preparo do chimarrão, uma bebida estimulante, preparada pela infusão de suas folhas e talos moídos. Este trabalho apresenta a análise de metilxantinas em folhas de I. paraguariensis e outras espécies de Ilex
Publicado em: 2010
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11. Efeito da acidez e de modificadores orgânicos na determinação de metilxantinas: um experimento de cromatografia liquida de alta eficiência (CLAE) empregando otimização uni e multivariada
In this work a new experiment using HPLC is proposed in order to explore the role of acidity and the organic modifiers in the determination of methylxanthines in tea and coffee. Multivariate and univariate optimizations of the experimental conditions were used.
Química Nova. Publicado em: 2009
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12. DESENVOLVIMENTO E VALIDAÇÃO DE MÉTODO ANALÍTICO DE CROMATOGRAFIA LIQUIDA DE ALTA EFICIÊNCIA E ENSAIO DE DISSOLUÇÃO PARA AVALIAÇÃO DA QUALIDADE DE FITOTERÁPICOS CONTENDO Paullinia cupana Kunth / DEVELOPMENT AND VALIDATION OF ANALYTICAL METHODS LIQUID CHROMATOGRAPHY AND HIGH PERFORMANCE TEST SOLUTION FOR QUALITY ASSESSMENT CONTAINING HERBAL cupana Kunth Paullinia
The Herbal medicines are obtained by using only raw vegetable active. Guarana (Paullinia cupana Kunth.) is used as an invigoranting and challenging due to the presence in the seeds of methylxanthines, especially caffeine and theobromine and theophylline lesser amount, and tannins. The test is an dissolution of the tests used in assessing the quality of these
Publicado em: 2009