2-O-β-d-Glucopyranosyl-carboxyatractyligenin from Coffea L. inhibits adenine nucleotide translocase in isolated mitochondria but is quantitatively degraded during coffee roasting
摘要:
Atractyloside (1) and carboxyatractyloside (2) are well-known inhibitors of the adenine nucleotide translocase (ANT) in mitochondria, thus effectively blocking oxidative phosphorylation. Structurally related derivatives atractyligenin (3), 2-O-beta-D-glucopyranosyl-atractyligenin (4), 3'-O-beta-D-glucopyranosyl-2'-O-isovaleryl-2 beta-(2-desoxy-atractyligenin)-beta-D-glucopyranoside (5), and 2-O-beta-D-glucopyranosyl-carboxyatractyligenin (6) were isolated from raw beans of Coffea L and the impact of 1-6 on ANT activity was evaluated in isolated mitochondria. Among the coffee components, 6 significantly inhibited ANT activity leading to reduced respiration. Quantitative analysis in commercial coffees, experimental roastings of coffee, and model experiments using purified compound 6 consistently revealed a complete degradation during thermal treatment. In comparison, raw coffee extracts were found to contain high levels of 6, which are therefore expected to be present in food products enriched with raw coffee extracts. This implies the necessity of analytically controlling the levels of 6 in raw coffee extracts when used as additives for food products. (C) 2013 Elsevier Ltd. All rights reserved.
Acyl atractyligenin and carboxyatractyligenin glycosides from Antennaria rosea subsp. confinis
作者:Yangyang Xiao、Ling Lv、Ping Gou、Haihui Xie
DOI:10.1016/j.phytochem.2018.10.018
日期:2019.1
Eight previously undescribed acyl atractyligenin and carboxyatractyligenin glycosides were isolated from whole Antennaria rosea subsp. confinis (Greene) R. J. Bayer (Compositae) [syn. Leontopodium leontopodioides (Willd.) Beauv. (Asteraceae)] plants and their structures were determined by spectroscopic and chemical methods. The compounds were trivially named leontopodiosides F-M. Seven of the compounds
2-O-β-d-Glucopyranosyl-carboxyatractyligenin from Coffea L. inhibits adenine nucleotide translocase in isolated mitochondria but is quantitatively degraded during coffee roasting
Atractyloside (1) and carboxyatractyloside (2) are well-known inhibitors of the adenine nucleotide translocase (ANT) in mitochondria, thus effectively blocking oxidative phosphorylation. Structurally related derivatives atractyligenin (3), 2-O-beta-D-glucopyranosyl-atractyligenin (4), 3'-O-beta-D-glucopyranosyl-2'-O-isovaleryl-2 beta-(2-desoxy-atractyligenin)-beta-D-glucopyranoside (5), and 2-O-beta-D-glucopyranosyl-carboxyatractyligenin (6) were isolated from raw beans of Coffea L and the impact of 1-6 on ANT activity was evaluated in isolated mitochondria. Among the coffee components, 6 significantly inhibited ANT activity leading to reduced respiration. Quantitative analysis in commercial coffees, experimental roastings of coffee, and model experiments using purified compound 6 consistently revealed a complete degradation during thermal treatment. In comparison, raw coffee extracts were found to contain high levels of 6, which are therefore expected to be present in food products enriched with raw coffee extracts. This implies the necessity of analytically controlling the levels of 6 in raw coffee extracts when used as additives for food products. (C) 2013 Elsevier Ltd. All rights reserved.