A Study On The Vacuum Coating Technology Of Vitamin K3-phytase Emulsions Into Hard Pellets

The aim of the experiment is to study the emulsion confecting parameters with heat labile feed additives, such as vitamins and enzymes, and the optimal vacuum infusion parameters of vitamin K₃ and phytase emulsion into hard pellets. The main study contents are: (1) The factors influencing the infiltration depth of the liquid thermo-sensitive feed additives into hard pellets, and the optimization of these parameters. (2) The optimal proportion of the emulsion ingredients including the emulsifiers, and oil and water ratio. (3) Screening of the optimal vacuum infusion parameters of vitamin K₃-phytase emulsions. (4) The storage and transportation stability of the heat sensitive additives of the vacuum coated products.The results showed that: All the factors including liquid volume, vacuum pressure, release time, and mixture time have no significant influence on the final infusion depth of vacuum coated liquid. The best vacuum infusion parameters are: liquid volume: 135 ml/2kg, vacuum pressure: 0.046 MPa, mixing time: 5 min and vacuum release time: 40 s. The depth of infiltration under this process condition is 0.127 mm. (2) When the additional spray pressure added, the infiltration depth of feed additives aqueous solution was enhanced. The best process parameter for penetration is that: liquid volume: 120 ml/2kg, vacuum pressure: 0.080 MPa, mixing time: 5 min and vacuum release time: 35 s, and the depth of infiltration under this process condition is 0.151 mm. (3) The best compounding ratio of the emulsifiers in the emulsions of vitamin K₃ and phytase is that monoglyceride: Span60: phosphatidylcholine = 4:9:1, and the better oil to water ratio in the emulsion is 1:1. (4) The experiment of vacuum infusion of emulsion to hard pellets showed that: liquid dosing, vacuum pressure and release time all had effects on spraying uniformity and lost rate of vitamin K₃ and phytase. Liquid volume had the biggest effect. (5) The optimal vacuum infusion parameter of thermo-sensitive feed additives emulsion were that: liquid dosing: 120 ml/2kg; liquid temperature: 50℃; vacuum pressure: 0.050 MPa; mixing time: 5 min; release time: 130 s.