Pharmacological activity and hydrolysis behavior of novel ibuprofen glucopyranoside conjugates
摘要:
Novel ester prodrugs (II, III and IV) of ibuprofen (I) were synthesized using a-methyl, ethyl and propyl glucopyranoside as promoieties and tested for their anti-inflammatory, analgesic and ulcerogenic activities. Study of their chemical hydrolysis in aqueous buffer (PH 3.0-10.0) showed that these compounds acted as true prodrugs of ibuprofen, giving the ibuprofen and alkyl glucopyranoside. Additionally, all the derivatives studied did cleave rapidly inside the biological system and on oral administration did elicit a pharmacological profile quite similar to that of ibuprofen, but, unlike this drug, they displayed reduced gastric ulceration. In conclusion, these alkyl glucopyranoside esters have promising properties as prodrugs for oral delivery of ibuprofen. (c) 2006 Elsevier Masson SAS. All rights reserved.
Substrate specificity in hydrolysis and transglucosylation by family 1 β-glucosidases from cassava and Thai rosewood
摘要:
Thai rosewood (Dalbergia cochinchinensis Pierre) dalcochinase and cassava (Manihot esculenta Crantz) linamarase are glycoside hydrolase family 1 beta-glucosidases with 47% amino acid sequence identity. Each enzyme can hydrolyze its natural substrate, dalcochinin-8'-O-beta-D-glucoside and linamarin, respectively, but not the natural substrate of the other enzyme. Linamarase can transfer glucose to primary, secondary and tertiary alcohols with high efficiency, while dalcochinase can transglucosylate primary and secondary alcohols at moderate levels. In this study, eight amino acid residues in the aglycone binding pocket of dalcochinase were individually replaced with the corresponding residues of linamarase, in order to identify residues that may account for their catalytic differences. The residues 1185 and V255 of dalcochinase appeared important for its substrate specificity, with their respective mutations resulting in 24- and 12-fold reductions in K-cat/K-m for the hydrolysis of dalcochinin-8'-O-beta-D-glucoside. Transglucosylation activity was improved when 1185, N189 and V255 of dalcochinase were replaced with A201, F205 and F271 of linamarase, respectively, suggesting these residues support transglucosylation in linamarase. Among these three mutants, only the N189F mutant showed significant increases in the rate constants for the reactivation of trapped glucosyl-enzyme intermediates by all alcohols. Together, our results suggest that both hydrophobicity and geometry are important determinants for substrate specificity in hydrolysis and transglucosylation by these family 1 beta-glucosidases. (C) 2010 Elsevier B.V. All rights reserved.
A highly selective enzyme-catalysed esterification of simple glucosides
作者:Fredrik Björkling、Sven Erik Godtfredsen、Ole Kirk
DOI:10.1039/c39890000934
日期:——
Regioselective 6-O-esterification of alkyl glucosides with long chain fatty acids, yielding more than 95% of 6-O-monoesters, can be achieved using lipases as catalysts in a solvent-free process.
SYNTHESIS OF MONOETHERS OF SUGAR COMPRISING A LONG ALKYL CHAIN AND USES THEREOF AS A SURFACTANT
申请人:TEREOS STARCH & SWEETENERS BELGIUM
公开号:US20180265533A1
公开(公告)日:2018-09-20
A process for obtaining a mixture of C4-C8 and C9-C18 alkyl monoether of saccharide, comprising: a) a first step of acetalization or trans-acetalization of a saccharide or of a mixture of saccharides with a C4-C8 aliphatic aldehyde or the acetal thereof, b) a second consecutive or simultaneous step of acetalization or trans-acetalization of the product obtained in a) of the saccharide or mixture of saccharides with a C9-C18 aliphatic aldehyde or the acetal thereof, c) a step of catalytic hydrogenolysis of the saccharide acetals obtained, and d) a step of recovery of a mixture of C4-C8 and C9-C18 alkyl saccharide monoethers. The invention further relates to a mixture of C4-C8 and C9-C18 alkyl saccharide monoethers and the use thereof as a surfactant.
ANTIBACTERIAL COMPOSITION CONTAINING AN ISOMER MIXTURE OF MONOSACCHARIDE ALKYL MONOACETALS OR MONOETHERS
申请人:TEREOS STARCH & SWEETENERS BELGIUM
公开号:US20170347653A1
公开(公告)日:2017-12-07
A bactericidal or bacteriostatic composition comprising an isomer mixture of monosaccharide alkyl monoethers or monoacetals, its use in the treatment or prevention of Gram-positive bacterial infections, its use as a hygiene or dermatological product for external use and a method for disinfecting surfaces.
The present invention relates to esterified glycerylated alkyl glycoside and to a process for making same. The esterified glycerylated alkyl glycoside have one or more polyglyceryl moieties and one or more acyl moieties, wherein all of the one or more acyl moieties are situated on the one or more polyglyceryl moieties via an ester linkage. These compounds have been found to be useful as emulsifiers and coemulsifiers in the formulation of a phase stable emulsions suitable for use in personal care, home care, industrial and institutional, and health care applications.
Fluorine-containing compounds and polymers derived therefrom
申请人:——
公开号:US20030109626A1
公开(公告)日:2003-06-12
Provided are fluorine-containing compounds, and polymers derived therefrom, for use in compositions used for treating textile substrates. Also provided are methods of making fluorine-containing compounds and polymers derived therefrom, compositions comprising the compounds and/or polymers of the present invention, methods of treating substrates, and the treated products derived therefrom.