title: Controlled methyl-esterification of pectin catalyzed by cation exchange resin.
abstract: This study developed a new method to methyl-esterify pectin using a cation exchange resin. Homogalacturonan (HG)-type pectin (WGPA-3-HG) and rhamnogalacturonan (RG)-I-type pectin (AHP-RG) obtained from the roots of Panax ginseng and sunflower heads, respectively, were used as models. Compared to commonly used methyl-esterification methods that use either methyl iodide or acidified methanol, the developed method can methyl-esterify both HG- and RG-I-type pectins without degrading their structures via β-elimination or acid hydrolysis. In addition, by modifying reaction conditions, including the mass ratio of resin to pectin, reaction time, and temperature, the degree of esterification can be controlled. Moreover, the resin and methanol can be recycled to conserve resources, lower costs, and reduce environmental pollution. This new methodology will be highly useful for industrial esterification of pectin.
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Peng
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Guang
authors.initials: G
authors.lastname: Yang
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xingchen
authors.initials: X
authors.lastname: Fan
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Yeming
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xiaomeng
authors.initials: X
authors.lastname: Ren
authors.affiliation: Jilin Province Key Laboratory on Chemistry and Biology of Natural Drugs in Changbai Mountain, School of Life Sciences, Northeast Normal University, Changchun 130024, PR China. Electronic address: zhouyf383@nenu.edu.cn.
authors.forename: Yifa
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D002384:Catalysis; D002411:Cation Exchange Resins / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D004951:Esterification; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D010368:Pectins / Q000737:chemistry*
chemical_list: D002411:Cation Exchange Resins; D010368:Pectins
keywords: Cation exchange resin; Degree of esterification; Methyl-esterification; Pectin