高剪切乳化技术辅助提取荷叶水不溶性膳食纤维工艺优化及其物性分析

为扩大荷叶在食品加工中的开发应用性,研究采用高剪切乳化技术辅助提取荷叶水不溶性膳食纤维(insoluble dietary fiber,IDF),优化提取工艺;测定其基本物性,并与常规粉碎、球磨式粉碎处理进行对比。结果表明,在剪切转速8000 rpm剪切时间4 min,酸液浓度0.25 mol/L,酸解温度45℃条件下荷叶IDF得率最高,为83.84%。此荷叶IDF水溶性13.81%,持水性5.65 g/g,持油性1.97 g/g,膨胀性1.93 mL/g。与球磨式粉碎相比,处理时间短,荷叶纤维呈束状、层次分明,荷叶纤维内质未被完全破坏;产品水溶性较低,持水性和膨胀性较高。高剪切乳化技术在食品纤维组分的加工中具有较好的应用潜力。

Optimization of high shear emulsification assisted extraction of insoluble dietary fiber from lotus leaf and its physical properties

In order to expand the development of lotus leaf in food processing,insoluble dietary fiber(IDF)of lotus leaf was extracted by high shear emulsification.Its basic physical properties of the IDF were determined and compared with the IDF extracted by conventional smashing and ball grinding.The results showed that the lotus leaf IDF yield extracted by high shear emulsification was the highest(83.84%)at a shear speed of 8000 rpm,a shear time of 4 min,an acid concentration of 0.25 mol/L,and an acid hydrolysis temperature of 45℃.The water solubility,water holding capacity,oil holding capacity and expansibility of the IDF were 13.81%,5.65 g/g,1.97 g/g and 1.93 mL/g,respectively.Compared with ball grinding,the treatment time of high shear emulsification was shorter,the lotus leaf fiber structure was not completely destroyed,the fiber in SEM diagram showed a bundle structure and distinct layers,and the water solubility was lower,the water holding capacity and expansion property were higher.High shear emulsification technology has a good application potential in the processing of high-fiber food.