83 research outputs found
Both tumour cells and infiltrating T-cells in equine sarcoids express FOXP3 associated with an immune-supressed cytokine microenvironment
Avaliação preliminar da atividade antimicrobiana do extrato de erva-mate (Ilex paraguariensis A. St. - Hil.) obtido por extração com CO2 supercrĂtico
Cell mediated immunity against HPV16 E2, E6 and E7 peptides in women with incident CIN and in constantly HPV-negative women followed-up for 10-years
Lychee (Litchi chinensis Sonn.) peel flour: effects on hepatoprotection and dyslipidemia induced by a hypercholesterolemic diet
Methylxanthines accumulation in Ilex species - caffeine and theobromine in erva-mate (Ilex paraguariensis) and other Ilex species
Ilex paraguariensis St.Hil. is an important crop used commonly at the meridional South America as a source of a stimulant beverage, called maté, prepared by infusion of its processed leaves and twigs. We describe herein the methylxanthines analyses in the leaves of I. paraguariensis and other Ilex species reported as maté adulterants. The methylxanthines content determined by HPLC were 0.65% for caffeine and 0.12% for theobromine from I. paraguariensis var. paraguariensis, and 0.003% for caffeine and 0.22% (estimated) for theobromine from I. paraguariensis var. vestita. It was not detected any methylxanthines from I. brevicuspis, I. dumosa and I. microdonta. Considering the results, simultaneous caffeine and theobromine accumulation seems hitherto to be a particular characteristic of I. paraguariensis. In addition to taxonomical significance, these data suggest that it should be possible to trace adulterations of the genuine I. paraguariensis using the methodology described herein
Methylxanthines accumulation in Ilex species - caffeine and theobromine in erva-mate (Ilex paraguariensis) and other Ilex species
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