AMINO ACID MODIFIED LIGNIN BROAD-SPECTRUM ANTIBACTERIAL AGENT AND PREPARATION METHOD AND APPLICATION THEREOF

摘要

The present invention belongs to the technical field of natural polymer antibacterial agents; disclosed are an amino acid modified lignin broad-spectrum antibacterial agent and preparation method and application thereof. The preparation method comprises the following steps: in an alkaline solution containing 5-50 parts by weight of lignin, adding 1-5 parts by weight of aldehyde and 1-5 parts by weight of amino acid; after heating and reacting at 40-120°C for 1-6 h, obtaining amino acid modified lignin broad-spectrum antibacterial agent. Also provided is an amino acid modified lignin broad-spectrum antibacterial agent prepared by the described method. In the preparation method, the active amino acid component modified lignin in the natural antibacterial peptide is used to obtain an amino acid modified lignin broad-spectrum antibacterial agent, effectively enhancing the antibacterial activity of the lignin and causing same to have high antibacterial activity and antibacterial performance superior to that of lignin; at the same time, the invention has an inhibitory effect on Gram-positive and -negative bacteria, and has broad-spectrum antibacterial properties; also, its toxicity is low, it has good biocompatibility, and it has enormous prospects for application in the fields of biomedicine, food, and cosmetics.