The invention relates to a large-scale preparation method of
protamine oligopeptide chelated zinc. The method comprises the following steps: by taking mature testis tissues of
aquatic organisms as raw materials, hydrolyzing testis
nucleoprotein by adopting high-temperature
sulfuric acid, carrying out
continuous flow centrifugal filtration and multi-stage membrane separation to obtain a
protamine oligopeptide solution which has the content of more than or equal to 95%, does not have
nucleotide and has high
metal zinc chelating activity, then adding
zinc salt, stirring, carrying out constant-temperature chelating, and carrying out
nanofiltration membrane
desalination and
impurity removal, thereby obtaining the
protamine oligopeptide with high
metal zinc chelating activity. The particle size of the nano protamine oligopeptide
chelated zinc particles is less than 300nm, and most (more than 80%) molecular weights of the nano protamine oligopeptide
chelated zinc particles are less than 1000Da. Although a chemical extraction and
metal chelation method is adopted, compared with a commonly used enzymolysis extraction and
metal chelation method, the protamine oligopeptide chelated zinc obtained by the method disclosed by the invention is higher in yield, less in time consumption and higher in
chelation rate. Meanwhile, the production of large-scale preparation of the protamine oligopeptide chelated zinc does not need special instruments and equipment, the technological method is simple and reliable, the technological process is efficient and flexible, and the protamine oligopeptide chelated zinc subjected to adsorption deodorization and embedding deodorization is good in
flavor in the aspects of smell and taste, is easier to serve as a
food additive or a nutritional supplement, and is suitable for industrial production. The product is accepted and eaten by vast consumers; and the protamine oligopeptide chelated zinc which is not subjected to fishy smell removal treatment can still be used as a
feed additive.