摘要
利用甲醇沉淀进口奶粉、国产奶粉和奶茶粉水溶液中的蛋白质,所得上清液用二氯甲烷萃取,再经傅里叶变换红外光谱法(FT-IR)分析沉淀物和各相中物质的成分.试验结果表明:3种样品沉淀物中均含有蛋白质和脂肪酸甘油三酯,在萃取时均有乳糖析出.三者上层(水+甲醇)均含有糊精;而下层(二氯甲烷-甲醇)进口奶粉中含有磷脂酰胆碱,国产奶粉中含有磷脂酰胆碱和长碳链伯酰胺,奶茶粉中含有咖啡因.
Proteins in imported milk powder, China -made milk powder and milk tea powder were precipitated via theaddition of methanol. The supernatant was extracted by dichloromethane. Then the components of precipitates and substancein the two phases were analysised by Fourier transform infrared spectrometry （ FT - IR）. Reasults were as follows：Precipitates of the powders contained proteins and triglyceride. Lactose was separated out during the extraction. The upperlayer（mixture of water and methanol） of the powders contained dextrin. The lower layer（mixture of dichloromethane andmethanol） of the imported milk powder contained phosphatidylcholine, while that of the China-made milk powder containedphosphatidylcholine and long carbon chain amide, and that of the milk tea powder contained caffeine.
出处
《分析测试技术与仪器》
CAS
2016年第3期165-168,共4页
Analysis and Testing Technology and Instruments
