PURPOSE: To obtain a polysaccharide cinnamic acid derivative having ultraviolet ray absorbing action and high safety, and excellent in compatibility with an oil agent for cosmetics.
CONSTITUTION: This polysaccharide cinnamic acid derivative is obtained by replacing a part or all of hydroxyl groups in polysacharride molecule with a cinnamic acid ester group of formula I (X is an alkoxy; (a) is 1-3) and a fatty acid ester group of formula II (R is a 5-21C straight-chain or a branched alkyl or alkenyl). The compound is obtained by esterification reaction of the polysaccharide with a cinnamic chloride of formula III and a fatty acid chloride of formula IV. In the derivative, average degree of substitution of the group of formula I per monosaccharide unit in polysaccharide molecule is preferably 0.1-2.9 and average degree of substitution of the group of formula II is preferably 0.1-2.9 and degree of total substitution of both is preferably 0.2-3.0. As the polysaccharide, β-1,4-glucan, α-1,4-glucan, α-1,6-glucan or their hydroxyethyl derivatives, hydroxypropyl derivatives or 2,3-dihydroxypropyl derivatives are exemplified.
KITA KATSUMI
FUJIKURA YOSHIAKI
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