Efficient release of ferulic acid from sweet potato (Ipomoea batatas) stems by chemical hydrolysis |
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Authors: | Myung-Suk Choi Ji-Hyun Park Ji Yun Min Bu-Kug Lim Byung Hyun Lee Gang Won Jung Jong-Yoon Lee Chandrakant S. Karigar Jae-Kyung Yang |
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Affiliation: | (1) School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100, USA; |
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Abstract: | An efficient method for release of ferulic acid from sweet potato stems was developed. Ferulic acid along with phenolic compounds were released from stems by acid and alkaline treatments. The base hydrolysis with 0.1 N NaOH yielded the highest quantity of total extracts (471.1 mg/g). The stems released more phenolic compounds when 0.0125∼0.025 N NaOH was employed. Where as ferulic acid release was maximal with 0.05 N H2SO4 (0.32 mg/g). Ferulic acid was separated from phenolics by column chromatography. Among the elution solvents, ethyl acetate fractions (80%) contained ferulic acid. Ethyl acetate eluants were further fractionated with n-hexane/ethyl acetate/formic acid (100/50/0.5, v/v/v). All fractions showed ferulic acid and phenolic compounds. Fraction V among them was ascribed to ferulic acid with an yield of 5.41 mg/g of dry sweet potato tissue. |
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Keywords: | ferulic acid phenolic compounds sweet potato acid/base hydrolysis |
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