Ultrasonic Assisted Enzymatic Water Extract Oil Of Kiwi Seeds And Its Study Of Microcapsules

Kiwifruit, with the reputation of " Precious Fruit of the World ", has rich nutrition and unique flavor, and has a very high value of nutrition, health and beauty. Kiwifruit seed contains rich linolenic acid and other unsaturated fatty acids,which are in the form of glyceride existing in kiwi fruit. Therefore, kiwifruit seed oil has become high quality functional food in the production of people recently, can also be used as raw materials for the beauty makeup products.Kiwifruit seed was used as raw materials in this paper. We applied ultrasonic assisted enzymatic to extract kiwi fruit seed oil content in water. On the basis of single factor,we studied the effect of solid-liquid ratio, particle size, ultrasonic power, treatment time, the type of enzyme, reaction temperature, reaction time, pH, and enzyme dosage on oil yield. By using single factor and response surface optimization experiment, the optimum extraction conditions were tested:raw material crushing degree of 60 mu, the ratio of material to water 1:10, intermittent ultrasound for 400 W, adding 2.5% of alkaline protease after the accumulative ultrasonic time 30 min, enzymolysis for 2.8 hours under the condition of 55 ℃, pH 9.2, finally, the extraction amount of kiwi fruit seed oil reached 92.57%.In the production process, some antioxidants are added to oils to prevent oxidation rancidity of fat, so more or less, which will cause some damage to the body and also doesn"t match the concept of health. This paper adopted complex condensation to prepare microcapsules of kiwifruit seed oil. Through single factor experiment, we researched the kind of the core wall material, the core wall ratio, wall material concentration, pH, temperature and the effect of curing time on the embedding rate. The test determined the soybean protein isolated-malt dextrin as the microcapsule wall material of kiwifruit seed oil. By using single factor and response surface optimization experiment, the best curing conditions were determined as follows:wall material concentration 1%, core wall material ratio of 1:1, pH 3.0, 40℃, the curing time of 6 h.To ensure optimal expiry date of microcapsules of kiwifruit seed oil, we studied its half-life, and determined the rate of degradation of kiwi fruit seed oil microcapsules constant of 2.793, the half-life of 18 months.