Maplexins, new α-glucosidase inhibitors from red maple (Acer rubrum) stems
摘要:
Thirteen gallic acid derivatives including five new gallotannins, named maplexins A-E, were isolated from red maple (Acer rubrum) stems. The compounds were identified by spectral analyses. The maplexins varied in number and location of galloyl groups attached to 1,5-anhydro-D-glucitol. The isolates were evaluated for a-glucosidase inhibitory and antioxidant activities. Maplexin E, the first compound identified with three galloyl groups linked to three different positions of 1,5-anhydro-D-glucitol, was 20 fold more potent than the a-glucosidase inhibitory drug, Acarbose (IC50 = 8 vs 160 mu M). Structure-activity related studies suggested that both number and position of galloyls attached to 1,5-anhydro-D-glucitol were important for a-glucosidase inhibition. (C) 2011 Elsevier Ltd. All rights reserved.
The present document describes a neutraceutical, cosmeceuticals, functional food, pharmaceutical, food ingredient, and non-food ingredient compositions comprising sugar maple extract, essential oil compositions comprising oil extracted from an
Acer
tree, sweetening compositions containing sugar extracted from maple tree leaves, food ingredients comprising maple tree extract, cosmetic composition comprising maple tree extracts, infusion compositions prepared from maple tree leaves, maple roots, maple wood, maple stems of leaves and samara, and stems/twigs as well as compounds isolated from sugar maple biomass and the methods of extracting the same.
[EN] CERAMIDE CONTENT INCREASING AGENTS<br/>[FR] AGENTS AUGMENTANT LA TENEUR EN CÉRAMIDES<br/>[JA] セラミド含量増加剤