Preparation of 4-O-methylglucuronoxylan Cinnamates

Add time:08/07/2019    Source:sciencedirect.com

Cinnamic acid is a phenolic acid. It has been reported, it has many physiological functions, including antioxidant, antimicrobial and anti-cancer activities. Because of these properties and its low toxicity, cinnamic acid is now widely used in the food and cosmetic industries. It is used as the raw material for the production preservatives and as an ingredient in skin protection agents. A series of 4-O-methylglucuronoxylan esters with different degree of substitution were prepared and studied. The esters were prepared by esterification of glucuronoxylan with the appropriate acid chloride, such as cinnamoyl chloride in different reaction time (0,5 or 2,5 h) at 50 °C with and without of catalyst dimethylaminopyridine (DMAP), the molar ratio 1:3. The degrees of substitution were 0.24, 0.37, 0.84 and 1.54. After preparation, the resulting esters were characterized by attenuated total reflectance (ATR), thermogravimetric analysis (TGA) and radical scavenging activity (RSA) method. It was found that these new cinnamoyl esters have antioxidant activity, and the antioxidant activity increases with increasing degree of substitution.

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