Nghiên cứu sản xuất chitosan khối lượng phân tử thấp từ xác tôm mịn trong quá trình sản xuất dịch đạm thủy phân

Abstract

     Crushed shrimp shells come from the pressing process (ca. 1wt.% of total shrimp waste) of shrimp byproducts during the protein hydrolysate production in Vietnam Food Company. As it is fi ne, it is keeping in the protein hydrolysate, which causes the reduction of the hydrolysate quality and waste the raw materials for chitin/chitosan production. The results showed that the crushed shrimp shells consisted of 10 – 14 wt.% of protein, 9 – 12 wt.% of minerals, 60 – 68 wt.% of chitin, and 8 – 12 wt.% of impurities. Crushed shells were used for production of chitin by pretreatment (removal of impurities), deproteinization (NaOH 2%, 10 h, 50ºC, 1:10 (w/v), demineralization (HCl 1%, 4 h, 30ºC, 1:10 (w/v)), decolorization (H₂O₂ 0.5%, room temperature, 12 h, 1:15 (w/v)). Then, chitin was converted into chitosan by deacetylation (NaOH 50%, 24 h, 80ºC, 1:10 (w/v). Chitin and chitosan are in a good quality for agriculture applications.

Keyword: Crushed shrimp shells, chitin, low molecular weight chitosan, protein hydrolysate, shrimp by-products