Abstract:
PURPOSE: Provided are a hydroxamic acid derivative which shows an antiaging effect and is improved in safety and stability to the skin stimulus and discoloration, its preparation method, and an antiaging skin preparation for external use and a collagenase and elastase expression inhibitor containing the derivative. CONSTITUTION: The hydroxamic acid derivative is represented by the formula 1, wherein R1 and R2 are H, a C1-C10 alkyl group or a C3-C6 cycloalkyl group; R3 is CONH, NHCO, CONR5 or NR5CO (wherein R5 is H or a C1-C10 alkyl group); and R4 is -(CH)n- (wherein n is 0 or 1). The method comprises the steps of reacting benzoic acid and methyl 4-aminobenzoate or 4-aminophenylacetic acid methyl ester or reacting aniline and monomethyl terephthalate, to prepare a benzamide compound; substituting the amino bond of the benzamide compound into an alkyl bond; hydrolyzing the methyl ester group to prepare an acid; and reacting the obtained acid with hydroxyl amine·HCl salt to prepare the hydroxamic acid derivative of the formula 1.
Abstract:
PURPOSE: A method for preparing secoisolariciresinol is provided to obtain a cosmetic composition having good absorptivity to the user's skin and excellent activity of inhibiting the formation of reactive oxygen species. CONSTITUTION: The method for preparing secoisolariciresinol comprises hydrolyzing flaxseed extract or secoisolariciresinol diglucoside separated therefrom. The hydrolysis is an acidic hydrolysis, alkaline hydrolysis or enzymatic hydrolysis. More particularly, the enzyme used in the enzymatic hydrolysis is selected from the group consisting of exo-glycolases and composite enzymes containing exo-glycolases. Further, the cosmetic composition contains the secoisolariciresinol in an amount of 0.0001 to 10 wt% based on the total weight of the composition.
Abstract:
PURPOSE: Tocopherol derivatives having antioxidant effect, a preparation method thereof, and a cosmetic composition containing the same are provided, thereby preventing aging of the skin. CONSTITUTION: Tocopherol derivatives represented by the formula (I) are provided, wherein R1, R2 and R3 are H or methyl, and have at least one methyl at 5, 7 or 8 site of tocopherol; A is CH2-CH(CH3)- or CH=C(CH3)-; R4 is CH2-CH2, CH=CH, CH2-CH2-CH2, CH2-CH(CH3)-CH2 or CH2-C(CH3)2-CH2; and R5 is diethanol amine, tris hydroxy amine or N-methyl glucamine. A method for preparing the tocopherol derivatives of the formula (I) comprises the steps of: (A) reacting tocopherol with anhydrous dicarboxylic acid in the presence of organic salt using organic base to prepare tocopherol carboxylic acid ester; (B) chlorination of the tocopherol carboxylic acid ester to prepare tocopherol dicarboxylic acid chloride; and (C) reacting the tocopherol dicarboxylic acid chloride with amine to prepare amide compounds.