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Microcapsule technology is a film - forming material ( referred to as the wall material ) by physical means or chemical means using the target material ( referred to as a core material) encapsulated into a spherical small particles ( diameter generally in the range of 5μm-200μm) technology The main purpose is to extend the storage time of the core material , to prevent the oxidation by air , to cover up the bad smell of the core material . The ester type catechin has a strong antioxidant activity , is an excellent anti-oxidant , and thus can easily be oxidized deterioration Therefore, catechin made ??microcapsules , can effectively solve this problem . The purpose of this study was to find the catechin suitable method of microencapsulation , ultimately determining the optimal experimental conditions , first studied the spray-drying method , first through the single factor experiment to determine the process parameters : primary emulsifier Span-80 and the Tween -80 , the HLB value of 5, the emulsifier content is 12%, the solvent with the soybean salad oil ratio of 1:3 , the inner phase and the external aqueous phase volume ratio of 1:5 , the secondary emulsifier is a sucrose ester the amount of emulsifier is 3%, and the raw material solids content of 30% . On this basis , considering the combined effects of certain factors impact microcapsules product performance optimization of process conditions in turn as follows : sodium caseinate and dextrin two main wall material quality than 1:4 , orthogonal experiment , emulsification The shearing time 15min, shear speed 3000r/min, inlet air temperature of 170 ° C . The finally obtained the embedding was 76% of the microcapsules . Secondly spray cooling method, the first experiment to determine the wall material of the combination of ethyl cellulose and stearic acid , and through a series of single-factor experiments to determine the process parameters as follows : at a temperature of 120 ° C and pressure of 0.2MPa under the conditions of the core material and wall material ratio is 1:10 , EC and stearic acid ratio of 1:4 , a solids content of 20% , the embedding of the final product was 93% . In short , the use of microencapsulation technology can make ester type catechin entrapped into having good dispersibility , fluidity, resistance to the same storage phosphor powder . Catechin, made ??microcapsule wall material with a polymer film has good stability , can be effectively used in food, medicine and other fields .
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