期刊
FOOD CHEMISTRY
卷 229, 期 -, 页码 837-846出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.02.150
关键词
Anthocyanidin reductase; Leucoanthocyanidin reductase; Antioxidant; Phenolic compounds metabolism; Solanum tuberosum
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica (PICT) [511, 1812]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) (PIP) [0226]
- Universidad Nacional de Mar del Plata (UNMdP) [EXA 539/11]
Natural variation of Andean potato was used to study the biosynthesis of phenolic compounds. Levels of phenolic compounds and corresponding structural gene transcripts were examined in flesh and skin of tubers. Phenolic acids, mainly chlorogenic acid (CGA), represent the major compounds, followed by anthocyanins and flavan-3-ols. High-anthocyanin varieties have high levels of CGA. Both metabolite and transcript levels were higher in skin than in flesh and showed a good correspondence. Two hydroxycinnamoyl-CoA transferases (HCT/HQT) have been involved in CGA production, of which HCT reflects CGA levels. Catechin was found in pigmented tissues whereas epicatechin was restricted to tuber skin. Transcripts of leucoanthocyanidin reductase (LCR), which generates catechin, could not be detected. Anthocyanidin reductase (ANR) transcripts, the enzyme responsible for epicatechin production, showed similar levels among samples. These data suggest that the biosynthesis of flavan-3-ols in potato tuber would require ANR but not LCR and that an epimerization process is involved. (C) 2017 Elsevier Ltd. All rights reserved.
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