Method for extracting protein peptide from membranes of fowl eggshells

Abstract

The invention discloses a method for extracting protein peptide from the membranes of fowl eggshells. The technical scheme of the method comprises the following steps: pulverizing eggshells in a superfine way; regulating the pH value to 3-5 by using organic acid as a solvent and preparing eggshell suspension; separating out nonprotein components in the eggshells; regulating eggshell protein afterbeing separated by deionized water, regulating the pH value to 5-9 by alkali, adding an enzyme preparation, heating and stirring; then adding peptidase, stirring, afterwards separating by centrifugation and removing material residues so as to obtain a small-peptide nutrient solution; and carrying out concentrating evaporation at 50-60 DEG C, drying and obtaining a small-peptide product. The invention has simple technique and strong operability, and the content of small peptide prepared by the invention is as high as more than 50%.

Description

technical field

[0001] The invention relates to an enzymatic hydrolysis preparation method of antioxidant active peptides, in particular to a method for extracting protein peptides from poultry eggshell membranes, belonging to the field of food and medicine. Background technique

[0002] my country is a big consumer of poultry eggs, and its food processing factories, pastry factories, hatcheries, hotels, corporate canteens and other units discard about 4 million tons of eggshells every year, which not only pollutes the environment, but also wastes resources. Because discarded eggshells will quickly rot and deteriorate, breeding bacteria, especially in summer, there are swarms of mosquitoes and flies, and the smell is unpleasant. In fact, eggshell is a kind of complete and highly combined biological calcium, composed of inorganic matter and organic protein, containing 2.8% organic matter, and the organic matrix mainly includes glycoprotein and glycopeptide. The eggshell memb...