Study On Preparation Of Zinc-rich Oyster Powder

Oyster is a high-protein, low-fat foods. Based on the oyster enzymatic hydrolysis,and then carry out the addition of exogenous zinc chelate, after spray-dried wasfinally obtained zinc-rich oysters powder. The purpose is to find an optimal zinc-richoyster powder production process, the development of safe and efficient zinc products,and the use of high-value oysters open new avenues. The main findings are asfollows:1.First, oysters as raw materials, Study on optimum the process of oysterenzymatic hydrolysis. With time, temperature, pH, and enzyme dosage four singlefactor effect on the hydrolysis of the results as the basis, choose papaya protease,flavor protease, neutral protease, alkaline protease, acidic protease, and trypsinprotease enzyme on oyster solution experiment. And select from one of the higheractivity of several enzymes composite hydrolysis experiments and optimizationsoftware Box-Behnken its hydrolysis technology for three factors and three levels ofresponse surface method by response surface analysis. Final results showed thatneutral protease and alkaline protease enzyme complex oysters best. The optimalhydrolysis process for enzymolysis temperature54.8℃, pH9, the amount of enzyme3000U/g, under the above conditions, the yield of oyster meat amino nitrogen solutionafter enzyme average value is10.88mg/g.2. After completion of the oyster enzymatic，exogenous zinc to its enzymatichydrolysate and research oyster enzymatic hydrolysate chelated zinc process. Bychelation technology, inorganic zinc into organic presence state chelated zinc, toimprove the utilization of zinc, provide a theoretical basis for preparing for naturalzinc-rich oyster. Rate of response to chelate through research chelation temperature,chelation time, factors affecting enzyme solution of amino acids and zinc ion contentmolar ratio of chelating results and response surface analysis software for itsBox-Behnken chelation process optimization, to determine the appropriate chelationprocess. The optimal chelation process temperature70.5℃, pH6.94, oyster enzymaticliquid amino nitrogen and zinc molar ratio of2.56:1, and its chelation rate of80.25%.3. Oyster enzyme solution after chelation and spray drying to obtain zinc-richoyster powder. With zinc-rich oyster product yield as the index, main factors affectingfeed concentration, inlet temperature and outlet temperature of the spray-dryingprocess of natural zinc-rich oyster yield in order to determine a suitable drying process, and through response surface analysis software to optimize its Box-Behnkenspray drying process. Optimal spray drying process to add maltodextrin drying aidsdigestion and oyster liquid soluble solids mass ratio is3:2,inlet temperature of180℃,outlet temperature of86.1℃, feed concentration of25%, the ultimate rich yield of76.73%zinc oyster. Zinc-rich oyster various physical and chemical indicatorscomposite GB of regulations.