The acetylation reaction involving detoxification of various aromatic amines both in vitro and in viva has become of new importance with the discovery by Lipmann et al. (1) that the coenzyme necessary for this coupling contains pantothenic acid. In an earlier paper (2), we gave evidence demonstrating that pantothenic acid is necessary for normal acetylation of p-aminobenzoic acid (PAB) by rats....

Acetylation is a chemical modification for estherification, in which hydroxyl groups are replaced with acetyl groups that offers him major stability, changing the physicochemical and functional properties of the starches. Acetylated starches presents 6-10 ° C less at the gelatinization temperature and the maximum peak viscosity is greater than that of a native starch, so are more readily disper...

dodecylbenzenesulfonic acid (dbsa) was used as an efficient, cheap and stable brønsted catalyst for acetylation of alcohols and phenols and formylation of alcohols under solvent-free conditions. various primary, secondary and tertiary alcohols were acetylated with acetic anhydride as an acetylating agent under solvent-free conditions in the presence of catalytic amount of dbsa at room temperatu...

Cellulose triacetate prepared from bacterial cellulose of Acetobacter xylinum subsp. sucrofermentans BPR3001A showed a higher degree of polymerization and higher mechanical strength than that from the cotton linter. The fine fibrils of bacterial cellulose required only a short time for acetylation which preserved the high degree of polymerization.

The valorisation of agricultural residues into a high value-added product is necessary to respond the global environmental concerns caused by pollution waste. objective this study was shed light on new usage cocoa pod husk (CPH) for synthesis cellulose triacetate (CTA). Alkaline treatment with sodium hydroxide (5 wt%) followed bleaching process (2 hydrogen peroxide found effective extraction fr...

This work explores the epicardial implantation of acellular chitosan hydrogels in two murine models cardiomyopathy, focusing on their potential to restore functional capacity heart. Different were generated using polymers four degrees acetylation, ranging from 2.5% 38%, because degree acetylation affects degradation and biological activity. The adjusted a 3% final polymer concentration. After c...

BACKGROUND We continue our exploration of the large polysaccharide polymer Chitosan as an acute therapy for severe damage to the nervous system. We tested the action of subcutaneously injected nanoparticles (~ 100 - 200 nanometers in diameter; 1 mg per ml) against control injections (silica particle of the same size and concentration) in a standardized in vivo spinal cord injury model. These fu...