Research progress on modification of antibacterial properties of lignin
The structure characteristics of lignin were summarized.The inhibitory mechanism of lignin on Gram-positive and Gram-negative bacteria was described,that is,the phenol hydroxyl group can promote the decrease of pH value around cells,thus destroying cell membranes,denaturating proteins,inhibiting the activity of respiratory system and electron transfer enzyme system of microbial cells,and achieving the inhibitory effect,while the reduction of molecular weight can increase the phenol hydroxyl group content of lignin.The water solubility of lignin can be improved effectively with the increase of hydrophilicity.Based on the research status at home and abroad,the main methods to improve the antibacterial activity of lignin(depolymerization,fractionation,extraction of lignin and lignin-silver complex)were introduced,the methods for improving the antibacterial activity of lignin modified by different methods were discussed,and the prospect of improving the antibacterial activity of lignin was also discussed.
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