Synthesis of mixed esters of ascorbic acid using methyl esters of palm and soybean oils |
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Authors: | Hsieh Hsin-Ju Chen Jech-Wei Giridhar R Wu Wen-Teng |
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Institution: | Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan. |
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Abstract: | Mixed esters of ascorbic acid were synthesized using methyl esters of palm and soybean oils as acyl donors, in acetone at 50 degrees C, and catalyzed by Novozym 435. A conversion of 62% was obtained with palm oil methyl ester at an ascorbic acid to acyl donor molar ratio of 1:4; the mixed ester contained 45.89% ascorbyl palmitate, 42.59% ascorbyl oleate and 10.1% ascorbyl linoleate. Acylation with soybean oil methyl ester resulted in 17% conversion, yielding a mixed ester containing 10.08% ascorbyl palmitate, 20.68% ascorbyl oleate, and 64.96% of ascorbyl linoleate. The mixed esters of ascorbic acid can find direct use in food and cosmetics. |
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