McGann T C, Kearney R D, Buchheim W, Posner A S, Betts F, Blumenthal N C
Calcif Tissue Int. 1983 Sep;35(6):821-3. doi: 10.1007/BF02405131.
The calcium phosphate remaining after hydrazine deproteination of casein micelles isolated from bulk skim milk exhibits under the electron microscope a very fine and uniform granularity being formed by small subunits with a true diameter of approximately 2.5 nm. This material, which is about 10 percent by weight citrate, termed calcium phosphate citrate (CPC) complex, also contains Mg and Zn at molar ratios of 0.03 and 0.003 respectively. Radial distribution function (RDF) and infrared analyses show that CPC is a Mg-containing amorphous calcium phosphate (ACP) similar to synthetic and cytoplasmic ACP. presence of CPC in casein micelles as an amorphous colloid bonded with phosphoproteins provides the means for storing in milk large amounts of Ca (16 mM) and Pi (10 mM) in a readily utilizable form but at a higher ion concentration than found in biological solutions.
从全脂脱脂乳中分离出的酪蛋白胶粒经肼脱蛋白处理后剩余的磷酸钙，在电子显微镜下呈现出非常细小且均匀的颗粒状，由直径约为2.5纳米的小亚基组成。这种物质约含10%（重量）的柠檬酸盐，称为磷酸钙柠檬酸盐（CPC）复合物，还分别含有摩尔比为0.03和0.003的镁和锌。径向分布函数（RDF）和红外分析表明，CPC是一种含镁的无定形磷酸钙（ACP），类似于合成的和细胞质中的ACP。酪蛋白胶粒中以与磷蛋白结合的无定形胶体形式存在的CPC，为以易于利用的形式在牛奶中储存大量的钙（16毫摩尔）和磷（10毫摩尔）提供了途径，但离子浓度高于生物溶液中的浓度。
