Sinonovacula constricta-derived bacillus alvei protein, application thereof to aquatic product preservation and application method thereof

A sinonovacula constricta-derived bacillus alvei protein and application thereof aquatic product preservation and an application method. The preparation method is as below: culturing sinonovacula constricta symbiotic bacillus alvei strains in a liquid medium comprising 40g / L glucose and 20g / L peptone and having pH value adjusted to 5; filling 150-250 mL of the liquid medium into each bottle and conducting shaking culture at the temperature of 30-35 DEG C and speed of 150-250 rpm for 4-6 days; centrifuging at 4000 r / min to remove thalli in the fermentation liquid, carrying out decompression concentration at 50 DEG C until 1/2 of the original volume, adding ammonium sulfate until the final saturation concentration reaching 90%, standing overnight at 4 DEG C, filtering, dissolving the precipitate with a PBS buffer liquid, conducting dialysis by using a dialysis bag with the cut-off molecular weight of 3600 Dalton for 4 days, conducting freeze-drying on the products in the dialysis bag, so as to obtain the sinonovacula constricta-derived bacillus alvei protein. The preparation process provided by the invention is simple and low in cost.