The invention relates to a preparation method and application of a
prawn non-
specific immunity reinforcing agent
oligopeptide. The preparation method comprises the following steps of:
mincing pacific alaskapollack dogmeat by a meat mincer and then placing in an
enzyme reactor to heat and sterilize; triturating and then heating to 90 DEG C to preserve the temperature; sterilizing for 20 minutes in a constant temperature water bath; adding water and
protease preparations to mix; carrying out enzymolysis under the condition of optimized enzymolysis process parameters; then heating enzymolysis liquid so that
protease is inactivated; roughly filtering fishbones and centrifugalizing the enzymolysis liquid to obtain a soluble
protein oligopeptide; ultrafiltering, purifying, freezing and
drying and then obtaining
protein oligopeptide powder. The
protease preparations comprise Alcalase and Flavourzyme, and the enzymolysis process parameters comprise the enzymolysis temperature of 55 DEG C, the initial pH value of 8.5, the material and water ratio of 1:1 and the enzymolysis time of 3 hours. A
macromolecule substance is intercepted by using a method for combining 8,000rpm high-speed centrifugalization and 100kDa
ultrafiltration membrane ultrafiltrating purification, and 30 percent of
protein oligopeptide with the molecular weight of smaller than 100Da is obtained, the further filteration is carried out by 1kDa / 5kDa
ultrafiltration membrane to obtain an ultrafiltrate, and the oligopeptide
powder is obtained by freezing and
drying the ultrafiltrate. The oligopeptide
powder replaces 5 percent of
fish meal in
prawn feed and can obviously improve the
blood corpuscle density, the phenoloxidase activity, the
respiratory burst activity, the SOD activity, the NOS activity and the specific growing rate of a
prawn.