Method for extracting proteins and chitin from shrimp heads and shrimp shells by pediococcus acidilactici

Abstract

The invention discloses a method for extracting proteins and chitin from shrimp heads and shrimp shells by pediococcus acidilactici, which comprises the following steps: (1) selecting fresh or frozen shrimp heads and shrimp shells, and unfreezing the frozen shrimp heads and the frozen shrimp shells; (2) adding carbon sources into the shrimp heads and the shrimp shells; (3) inoculating the pediococcus acidilactici; (4) carrying out heat-insulation fermentation; (5) separating fermentation liquid from residue after the fermentation is completed, and obtaining protein powder after the fermentation liquid is dried; and (6) carrying out diluted acid soaking and decolourization on fermentation residue to obtain chitin. Through the method of the invention, the proteins and the chitin in the shrimp heads and the shrimp shells can be simultaneously extracted out, and the obtained hydrolyzed proteins do not have stinking odor, and have rich calcium lactate and other mineral substances. The method of the invention has the advantages of simple operation method, production cost reduction and environmental pollution reduction, and rich nutritional ingredients contained in the shrimp heads and the shrimp shells can be sufficiently utilized.

Description

technical field

[0001] The invention relates to the field of methods for extracting protein and chitin from aquatic products, in particular to a method for extracting protein and chitin from shrimp heads and shrimp shells. Background technique

[0002] For shrimps, shrimp heads and shells are rich in nutrients. For example, the shrimp heads and shells of shrimps account for about 30% of the shrimp body weight. In addition to minerals such as chitin and calcium carbonate, they also contain 7~15% protein, 2~4% oil, rich in vitamin E, astaxanthin, lutein, lecithin and other ingredients, with high nutritional value.

[0003] At present, the utilization of shrimp heads and shrimp shells is mainly in two aspects: one is to produce chitin, and the other is to use self-cathepsin or exogenous protease to hydrolyze the protein therein and liquefy and separate it. However, direct production of chitin from shrimp heads and shells requires high-concentration acid and alkali treatment of...