Human ERH blocking peptide

A fast and simple method for the enantioseparation of l- and d-theanine using Marfey's reagent was developed. The method was validated for linearity, specificity, accuracy, stability, detection and quantification limits. The separation was achieved on RP columns with a gradient of 1 % acetic acid and acetonitrile. d-Theanine was synthesized with a purity of 96.5 %, and the enantiomeric composition of theanine was determined in 56 tea samples including instant teas. No detectable d-theanine was found in the fresh leaves and in the most of white teas. It was observed that d-theanine arises initially at the wither process and mounts up according to the strength of this step and to further handling or storage procedures. A quantitative relationship between the smallness of tea grades and the enantiomeric composition was observed just in Darjeeling teas. Higher proportions of d-theanine were found in the five cold water-soluble instant black teas gained after alkaline treatment (5.56-51.80 % of total theanine).

Fuzhuan brick tea is a distinctive Chinese dark tea for its significant health benefits and unique quality characteristics by a unique fungal fermentation stage, in which Eurotium cristatum strains play a crucial role in the post-fermentation process. In this study, the biochemical characteristics and lipid-lowing activity of E. cristatum (MF800948)-fermented loose tea (FT) were investigated. The results showed that total phenolics, fiavonoids, catechins and free amino acids were decreased after fermentation, while three purine alkaloids, soluble carbohydrates and theabrownins were significantly increased compared to green tea. In addition, D-limonene (27.71%) and beta-myrcene (11.55%) were the predominant volatiles in FT, giving the characteristic fruity and balsamic scent to the fermented loose tea. Correspondingly, the aqueous extract of FT showed potent lipid-lowering activity in a high-fat zebrafish model and the optimum effective concentration was 500 mu g/mL, at which the lipid level declined to 51.49% compared to control group. Hence, it was suggested that loose tea fermented by E. cristatum (MF800948) could provide valuable insights for developing a high-quality and hypolipidemic dark tea.