The biochemical characteristics of a novel fermented loose tea by Eurotium cristatum (MF800948) and its hypolipidemic activity in a zebrafish model. (January 2020)

• Record Type: Journal Article
• Authors: Xiao, Yue; Zhong, Kai; Bai, Jin-Rong; Wu, Yan-Ping; Zhang, Jia-Qi; Gao, Hong
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 117(2020)
• Publication Date: 2020-01
• Subjects: Eurotium cristatum -- Loose tea -- Lipid-lowering effect -- Zebrafish -- Theabrownins; Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2019.108629
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: 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, flavonoids, 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 β-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 μg/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. Highlights: A novel fermented loose tea by Eurotium cristatum (MF800948) is firstly prepared. Chemical components in the fermented loose tea dramatically alter in relative to green tea. Theabrownins in Eurotium cristatum (MF800948)-fermented loose tea are significantly increased. Aqueous extract of the fermented loose tea is efficient in lowering lipid level in vivo.