期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 202, 期 -, 页码 278-285出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.01.070
关键词
Pectin; Alkyl gallates; Density functional theory
资金
- Natural Science Foundation of Fujian Province of China [2021J01997, 2020J01810, 2021J01999]
- Foundation for Distinguished Young Talents in Higher Education of Fujian Province [JAT200341, JAT200301]
- Natural Science Foundation of Zhangzhou of China [ZZ2021J29]
In this study, alkyl gallates were enzymatically grafted onto pectin molecules, resulting in pectins with excellent antioxidant and antibacterial properties. The grafting rate was affected by the length of the alkyl chain. The acylated pectins exhibited strong antioxidant activity and antimicrobial performance.
The covalent grafting of alkyl gallates onto pectin using a lipase-catalyzed reaction in a tetrahydrofuran/aqueous medium process acylated pectin molecules with excellent antioxidant and antibacterial properties. The alkyl gallates including methyl, ethyl, and propyl gallates were enzymatically grafted onto pectin molecule, in order to study the effect of alkyl gallates on the functional modification of pectin. The grafting mechanism was analyzed by ultraviolet-visible spectrum (UV-Vis), Fourier transform infrared spectrum (FTIR), proton nuclear magnetic resonance ((HNMR)-H-1), and density functional theory (DFT). Results suggested that lipase grafted 4-OH of alkyl gallate onto pectin by catalyzing esterification in organic/aqueous solution, and the grafting rate was affected by the length of alkyl chain of the gallates molecule. In vitro experiments, the acylated pectins exhibited stronger antioxidant activity in the DPPH test and beta-carotene bleaching test and were found to have obvious antimicrobial performance against Escherichia coli and Staphylococcus aureus.
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