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Flavan-3-ols from Ulmus davidiana var. japonica with inhibitory activity on protein glycation
Ga Young Lee1, Dae Sik Jang, Junghyun Kim
1Department of Herbal Pharmaceutical Development, Korea Institute of Oriental Medicine, Daejeon, Republic of Korea.
Abstract:
Four flavan-3-ols, (+)-catechin ( 1), (+)-catechin 7- O- beta- D-apiofuranoside ( 2), (+)-catechin 7- O- beta- D-xylopyranoside ( 3), (+)-catechin 7- O- beta- D-glucopyranoside ( 4), and proanthocyanidin A-1 ( 5) as well as three other constituents, isolated from an EtOAc-soluble extract of the stem barks of Ulmus davidiana var. japonica, were evaluated for inhibitory activity against the formation of AGEs. Compounds 1 - 5 exhibited a significant inhibitory activity on the formation of AGEs in an AGEs-BSA assay by specific fluorescence and this was confirmed by an indirect AGEs-ELISA. Moreover, compounds 1 and 5 markedly reduced AGEs-BSA cross-linking to collagen in a dose-dependent manner. AGEs:advanced glycation end products BSA:bovine serum albumin CC:column chromatography CD:circular dichroism.
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