Benzophenone C- and O-Glucosides from Cyclopia genistoides (Honeybush) Inhibit Mammalian α-Glucosidase
摘要:
An enriched fraction of an aqueous extract prepared from the aerial parts of Cyclopia genistoides Vent. yielded a new benzophenone di-C,O-glucoside, 3-C-β-d-glucopyranosyl-4-O-β-d-glucopyranosyliriflophenone (1), together with small quantities of a known benzophenone C-glucoside, 3-C-β-d-glucopyranosylmaclurin (2). The isolated compounds showed α-glucosidase inhibitory activity against an enzyme mixture extracted from rat intestinal acetone powder. Compound 2 exhibited significantly (p < 0.05) higher inhibitory activity (54%) than 1 (43%) at 200 μM. In vitro tests in several cell models showed that 1 and its 3-C-monoglucosylated derivative (3-C-β-d-glucopyranosyliriflophenone) were marginally effective (p ≥ 0.05) in increasing glucose uptake.
Enzymatic Synthesis of Acylphloroglucinol 3-<i>C</i>
-Glucosides from 2-<i>O</i>
-Glucosides using a <i>C</i>
-Glycosyltransferase from <i>Mangifera indica</i>
作者:Dawei Chen、Lili Sun、Ridao Chen、Kebo Xie、Lin Yang、Jungui Dai
DOI:10.1002/chem.201600411
日期:2016.4.18
synthesis of acylphloroglucinol 3‐C‐glucosides from 2‐O‐glucosides was exploited using a novel C‐glycosyltransferase (MiCGTb) from Mangifera indica. Compared with previously characterized CGTs, MiCGTb exhibited unique de‐O‐glucosylation promiscuity and high regioselectivity toward structurally diverse 2‐O‐glucosides of acylphloroglucinol and achieved high yields of C‐glucosides even with a catalytic amount
Benzophenone <i>C</i>- and <i>O</i>-Glucosides from <i>Cyclopia genistoides</i> (Honeybush) Inhibit Mammalian α-Glucosidase
作者:Theresa Beelders、D. Jacobus Brand、Dalene de Beer、Christiaan J. Malherbe、Sithandiwe E. Mazibuko、Christo J. F. Muller、Elizabeth Joubert
DOI:10.1021/np5007247
日期:2014.12.26
An enriched fraction of an aqueous extract prepared from the aerial parts of Cyclopia genistoides Vent. yielded a new benzophenone di-C,O-glucoside, 3-C-β-d-glucopyranosyl-4-O-β-d-glucopyranosyliriflophenone (1), together with small quantities of a known benzophenone C-glucoside, 3-C-β-d-glucopyranosylmaclurin (2). The isolated compounds showed α-glucosidase inhibitory activity against an enzyme mixture extracted from rat intestinal acetone powder. Compound 2 exhibited significantly (p < 0.05) higher inhibitory activity (54%) than 1 (43%) at 200 μM. In vitro tests in several cell models showed that 1 and its 3-C-monoglucosylated derivative (3-C-β-d-glucopyranosyliriflophenone) were marginally effective (p ≥ 0.05) in increasing glucose uptake.