Enhancing isolation of p-coumaric and ferulic acids from sugarcane bagasse by sequential hydrolysis
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To improve the yield of p-coumaric acid (p-CA) and ferulic acid (FA), sequential alkaline and acid hydrolysis was applied to sugarcane bagasse. Gas chromatography-mass spectrometry was used to quantify p-CA and FA. The sequential hydrolysis isolated more p-CA and FA from sugarcane bagasse than did alkaline hydrolysis or acid hydrolysis alone. Ethyl acetate extracted more p-CA and FA than chloroform. Increased temperature improved the yield of p-CA and FA. The total yields of p-CA and FA from sugarcane bagasse were 4.38 and 0.79%, respectively. For p-CA, the ester and ether bonds accounted for 93.60% and 6.40% of the total linkages, respectively. For FA, the ester and ether bonds accounted for 51.90% and 48.10% of the total linkages, respectively. Cleavage of the bond between hydroxycinnamic acid (p-CA and FA) and lignin was also confirmed by 13C NMR through comparison with the spectra of milled wood lignin and alkaline-soluble lignin.
KeywordsSugarcane bagasse Sequential hydrolysis p-Coumaric acid Ferulic acid Lignin
This project was financially supported by the Natural Science Foundation of China (no. 31400514), the Guangxi Science Foundation (no. 2018JJA130224), and the Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control (no. ZR201805-7).
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Conflict of interest
The authors report no conflict of interest. The authors alone are responsible for the content and writing of the paper.
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