Study On The Microencapsulation And Oxidation Stability Of α-linolenic Acid Ethyl Ester

Linseed oil fatty acid ethyl ester is raw materials, which contain55%ɑ-linolenic acidethyl ester, comparing the combination of different compound emulsifier in the influence ofalpha linolenic acid ethyl ester emulsion stability, and the best combination of compoundemulsifier is determined. To establish an embedding of ɑ-linolenic acid ethyl ester ofmicrocapsule technology, wall material was screened. And the oxidation stability ofmicrocapsule of alpha linolenic acid ethyl ester was studied. Main conclusions are as follows:To study the influence factors of Tween20-glycerol monostearate, Tween80-glycerolmonostearate, Tween80-Span80and Tween20-Span80that four of the mixed emulsifieremulsified ɑ-inolenic acid ethyl ester, including emulsifying temperature, emulsifying time,amount of emulsifier and the proportion. The results showed that the optimum compoundwith emulsifier composition is Tween20-glycerol monostearate. The emulsion stability was upto63.87%.The influence factors of emulsion stability of ɑ-linolenic acid ethyl ester was studied bysingle factor experiment, which include emulsifying temperature, emulsifying time,emulsifying agent and proportion, and get a best emulsification conditions. Response surfacemethodology is applied to optimize the parameters in emulsifying ɑ-linolenic acid ethyl ester.The optimum emulsifying conditions were determined as follows: emulsifying time is4min,emulsifier content is2.0%, emulsifier ratio of3:2, emulsifying temperature is70℃. Underthis condition of the process, the stability of the emulsion was64.10%.By comparing with soybean protein isolated and malt dextrin as wall material embeddingof alpha linolenic acid ethyl ester of the embedding rate, determine the soybean proteinisolated as the embedding of alpha linolenic acid ethyl ester of single wall, on the basis ofsingle factor experiment, using the response surface method of alpha linolenic acid ethyl estermicrocapsule technology was optimized. Get the best process conditions for microcapsules:solids content10%, the proportion of core to wall1:2, spray drying inlet temperature168℃.Under this condition, ɑ-linolenic acid ethyl ester microcapsule embedding rate was52.62%.Through single factor experiment, the influence factors which affect soybean protein andmaltodextrin compound wall embedding of ɑ-linolenic acid ethyl ester were studied, to getthe best condition of microcapsule embedding, response surface methodology was appliedThe optimum embedding conditions were determined as follows:13.7%solids content, theproportion of core to wall7:12, inlet temperature of164℃, the feed rate of300ml/h, themixed ratio1:1. Under the condition of the process that the embedding rate was the average of49.24%.Using the oven method to the oxidation stability of alpha linolenic acid ethyl ester, theresults show that peroxide value can better judge the oxidation of alpha linolenic acid ethylester, the oxidation induction period and oxidation accelerated points of alpha linolenic acidethyl ester was16d. Through the microcapsule embedding, the shelf life of alpha linolenicacid ethyl ester was around430d.