Abstract: The paper studied the techniques for making D-glueosamine hydrochloride from certain chitin. The result showed that a 26% output rate could be achieved under such technological conditions that chitin was hydrolyzed in 36% hydrochloric acid for 3.5 hours and hydrolytic temperature was 90℃ .The mass of chitin to hydrochloric acid solvent was 1∶6 and the recovery rate of chlorate was 60%. The product made with this technique was confirmed by IR spectra dimaction.It showed that GAH had a better effect on the storage life of Lycopersicum esculentum.

Key words: chitin D-Glucosamine Lycopersicum esculentum Antistaling agent