【摘要】 牦牛或奶牛酪蛋白CPPs粗制品,经阴离子交换精制后获得的高磷组分具有相似的高效分子排阻层析(HPSEC)谱图,均分离出3个峰,分子量依次在15000￣16500u之间、4000￣5000u之间及2500u左右。采用体外消化模拟实验研究了CPPs样品的促钙吸收能力,证实牦牛与奶牛酪蛋白CPPs在促钙吸收能力方面无明显差异。探讨了CPPs制品的促钙吸收能力与r(N/P)、分子量大小分布之间的关系,结果表明:牦牛与奶牛酪蛋白CPPs的r(N/P)值越小其促钙吸收能力越强,而且分子量小于5000u组分在CPPs制品中所占百分率增加,则其r(N/P)呈下降趋势。更多还原

【Abstract】 Two similar chromatograms could be given for the ion-exchange purified yak and milch cow casein phosphopeptides(CPPs) by High Performing Size Exclusion Chromatograghy,for each sample,three components were separated and the molecule weight distribution were found to be 15 000~16 500 u,4 000~5 000 u and about 2 500 u respectively;By gastrointestinal simulating experiments in vitro,no difference of the Ca2+-promoted absorbency existed in evidence between CPPs of yak and milch cow caseins.In addition,the relations between the the molecular weight distribution,the Ca2+-promoted absorbency ability and the r(N/P) of CPPs were investigated,it indicated that the r(N/P) of each CPPs was less,the better was its Ca2+-promoted absorbency ability and also the r(N/P) of CPPs trend to reduce while the percentage of the components with a molecular weight less than 5 000 u increased.更多还原