title: Metabolomic analysis of the effect of shade treatment on the nutritional and sensory qualities of green tea.
abstract: We analyzed metabolites from a 50% aqueous methanol extract of green teas treated with different shade periods (0, 15, 18, and 20 days) to investigate the effect of low light on their nutritional and sensory qualities. The shaded groups could be clearly distinguished from the control (0 day), and the 20 day group was separated from the 15 and 18 day groups. The shade treatment increased quercetin-galactosylrutinoside, kaempferol-glucosylrutinoside, epicatechin gallate, epigallocatechin gallate, tryptophan, phenylalanine, theanine, glutamine, glutamate, and caffeine levels but decreased quercetin-glucosylrutinoside, kaempferol-glucoside, gallocatechin, and epigallocatechin levels. Further studies on the nutritional benefits of these metabolites are needed. However, this result, along with the sensory evaluation and color measurement data, suggests that shade treatment improves the nutritional and sensory quality of green tea. Thus, we proposed a metabolomic pathway related to the effect of low light, which could elucidate the relationship between low light and tea quality.
authors.affiliation: Korea Food Research Institute, 516 Baekhyun-dong, Bundang-gu, Seongnam, Gyeonggi 463-746, Republic of Korea.
authors.forename: Lan-Sook
authors.initials: LS
authors.lastname: Lee
authors.forename: Ji Hea
authors.initials: JH
authors.lastname: Choi
authors.forename: Nari
authors.initials: N
authors.lastname: Son
authors.forename: Sang-Hee
authors.initials: SH
authors.lastname: Kim
authors.forename: Jong-Dae
authors.initials: JD
authors.lastname: Park
authors.forename: Dae-Ja
authors.initials: DJ
authors.lastname: Jang
authors.forename: Yoonhwa
authors.initials: Y
authors.lastname: Jeong
authors.forename: Hyun-Jin
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D000383:Agriculture / Q000379:methods*; D028241:Camellia sinensis / Q000254:growth & development* / Q000378:metabolism; D063427:Food Quality; D006801:Humans; D055432:Metabolomics / Q000379:methods; D009753:Nutritive Value; D010936:Plant Extracts; D018515:Plant Leaves / Q000254:growth & development* / Q000378:metabolism; D056910:Republic of Korea; D012677:Sensation; D013472:Sunlight; D013662:Tea / Q000737:chemistry*; D013997:Time Factors
chemical_list: D010936:Plant Extracts; D013662:Tea