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The 'Original Milk' Makes Its Way to States

机译：“原始牛奶”进入各国

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There's a new type of milk in the marketplace, which some say is actually "the original milk." It's considered new because no producer has ever selected milk based on its protein composition. In reality it's old, or better said, original, as the protein composition is reflective of the way milk once was. To better understand, about 30% of the nutritionally important protein in cows milk is beta-casein, which equates to about 2.5g per one cup serving. Research indicates that originally all cows produced milk containing only the A2 type of beta-casein, but at some point in history, owing to natural genetic mutation, a variant of the A2 gene and its associated protein appeared. Termed the A1 variant, it differed very slightly in composition from the original A2 beta-casein and has since given rise to a number of minor related sub-variants, such as those termed B and C. Both A1 and A2 beta-casein are constructed from 209 amino acid units strung together in a common sequence to form a chain, with one key distinction in the 67th amino acid. In the case of A2 beta-casein, the 67th amino acid in the chain is proline in contrast to histidine, the amino acid in the corresponding location in the A1 variant.
机译：市场上有一种新型的牛奶，有人说这实际上是“原始牛奶”。之所以被认为是新的，是因为从未有生产商根据其蛋白质成分选择过牛奶。实际上，它是古老的，或更确切地说是原始的，因为蛋白质的成分反映了牛奶曾经的样子。为了更好地理解，牛奶中约30％的营养重要蛋白质是β-酪蛋白，相当于每杯约2.5克。研究表明，最初所有奶牛生产的牛奶都只含有A2型β-酪蛋白，但在历史的某个时候，由于自然遗传突变，出现了A2基因及其相关蛋白的变体。称为A1变体，与原始A2β-酪蛋白的成分略有不同，此后产生了许多次要的相关亚变体，例如称为B和C的变体。A1和A2β-酪蛋白均被构建共有209个氨基酸单元以相同顺序串在一起形成一条链，其中第67个氨基酸有一个关键区别。就A2β-酪蛋白而言，链中的第67个氨基酸是脯氨酸，而组氨酸是A1变体中相应位置的氨基酸。

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    《Dairy foods》 |2007年第10期|p.32|共1页
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  • 中图分类 乳品加工工业;
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