title: Chemical composition and sensory evaluation of fermented tea with medicinal mushrooms.
abstract: In commercial tea production, plenty of tea leaf waste is generated, which may not only exert pollution risk to environment, but also a huge waste of bioactive ingredients in tea. In this study, the 4th to 7th leaves of tea bush were collected and used as substrate for mycelial culture of two renown medicinal mushrooms Grifola frondosa and Tianzhi (new variants of Ganoderma lucidum) to obtain a new type of solid-state fermented tea. Result showed that the polysaccharides of Grifola frondosa and Tianzhi fermented tea were 1.52 and 4.14 %, tea polyphenols were 1.51 and 1.85 %, the free amino acids were 1.52 and 0.94 %, caffeine were 1.16 and 1.70 %, polyphenols/amid acids ratio were 1.0 and 1.98, water extractions were 35.53 and 32.86 %, protein contents were 17.63 and 6.13 mg/g, respectively. The volatile components were mainly composed of alcohols, esters, aldehydes and ketones. The contents of major flavor compositions of fermented tea had changed and their relation tended to be harmonious, and the variety of amino acids significantly increased. Therefore, the sensory flavor and therapeutic qualities of fermented tea were significantly improved.
authors.affiliation: Department of Bioengineering, College of Food Science, South China Agricultural University, 482 Wushan Street Tianhe, Guangzhou, 510640 China.
authors.forename: Wei-Fang
authors.initials: WF
authors.lastname: Bai
authors.affiliation: College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002 China.
authors.forename: Xin-Yue
authors.initials: XY
authors.lastname: Guo
authors.affiliation: Department of Bioengineering, College of Food Science, South China Agricultural University, 482 Wushan Street Tianhe, Guangzhou, 510640 China.
authors.forename: Li-Qing
authors.initials: LQ
authors.lastname: Ma
authors.affiliation: Department of Bioengineering, College of Food Science, South China Agricultural University, 482 Wushan Street Tianhe, Guangzhou, 510640 China.
authors.forename: Li-Qiong
authors.initials: LQ
authors.lastname: Guo
authors.affiliation: Department of Bioengineering, College of Food Science, South China Agricultural University, 482 Wushan Street Tianhe, Guangzhou, 510640 China.
authors.forename: Jun-Fang
authors.initials: JF
authors.lastname: Lin
keywords: Fermentation tea; Medicinal mushroom; Polyphenols/amino acids ratio; Sensory evaluation