A- type proanthocyanidins from peanut skins
1999
Lou, H. | Yamazaki, Y. | Sasaki, T. | Uchida, M. | Tanaka, H. | Oka, S.
Six A-type proanthocyanidins were isolated from the water-soluble fraction of peanut skins. On the basis of spectral data, reductive cleavage with sodium cyanoborohydride, and chiral HPLC analysis, three new compounds, epicatechin-(2beta leads to O leads to 7, 4beta leads to 6)-catechin, epicatechin-(2beta leads to O leads to 7, 4beta leads to 6)-ent-catechin and epicatechin-(2beta leads to O leads to 7, 4beta leads to 6)-ent-epicatechin were unambiguously identified, together with the three known compounds, proanthocyanidin A-1, proanthocyanidin A-2 and epicatechin-(2beta leads to O leads to 7, 4beta leads to 8)-ent-epicatechin. (13)C NMR chemical shift rules to distinguish between [2 leads to O leads to 7, 4 leads to 8] and [2 leads to O leads to 7, 4 leads to 6] double-linked heptamethyl ethers of A-type proanthocyanidins are proposed. Bioassay experiments showed that these six compounds possess substantial activity against hyaluronidase.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library