婴儿配方奶粉油脂微胶囊化稳定性的研究

Storage stability of microencapsulated nutritional oils

以脂肪酸配比合理的混合植物油为芯材,大豆分离蛋白(SPI)和麦芽糊精(MD)为复合壁材,大豆卵磷脂为乳化剂,采用喷雾干燥工艺制备微胶囊化营养油从而来提高其稳定性。研究微胶囊营养油的包埋效果以及贮藏稳定性,同时通过检测产品的感官指标、理化指标和卫生指标,制定微胶囊营养油的参考标准。结果表明,微胶囊营养油表面平滑,无凹陷,并且没有孔隙和裂缝,产品粒径为24.2769μm,产品的过氧化值始终低于12 meq/kg。微胶囊营养油的玻璃化转变温度T_g=65.18℃,说明贮存在室温下的微胶囊化营养油处于玻璃态,储藏效果比较稳定,微胶囊营养油的滋气味在测试期间几乎没有变化,产品的感官指标、理化指标和卫生标准均符合国家标准。基于Schhal烘箱测试法,根据Arrhenius经验公式,推算出所测微胶囊样品在22℃的保质期约为24个月。

Nutritional oils for infant formula was microencapsulated by spray drying method, with coating materials including maltodextrin （MD）, soy protein isolate （SPI） and emulsifier （soy ecithin） to improve the storage stability. The storage stability of microcapsule nutritional oil was determined by differential scanning calorimetry and the peroxide value of oil. The surface and internal structure of the product and the storage stability were observed. The reference standards of microcapsule nutritional oil were developed by testing the sensory indexes, physical and chemical indexes and hygienic indexes. The results showed that the microparticles had generally spherical shape and smooth surface without depression, aperture and crack. The mathematical mean of microparticles was 24.2769 μm. The POV of nutritional oils microencapsule was lower than 12 meq/kg, and the glass transition temperature （Tg） value of spray-dried nutritional oils measured by DSC were 65.18 ℃, so it indicated that microencapsulated nutritional oils would be very stably storied at room temperature. The oranoleptic indicator, physicochemical Index and hygienic standard of nutritional oils microencapsule are accord with national standard after evaluation. The nutritional ingredient and hygienic standard of nutritional oils microencapsule are accord with national standard. According to the empirical formula of Arrhenius, The results show that the shelf life of nutritional oils microencapsule could be as long as 24 months.