Question

which year hg. hapkis to reaserch milk?​

Answer 1

Answer:

1901 Hopkins discovered the amino acid. ... whether from years of experience gained by working on that ... Noticing that rats failed to grow on a diet of artificial milk ...

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Answer 2

In 1901 Hopkins discovered the amino acid tryptophan, isolated it from protein, and eventually (1906–07) showed that it and certain other amino acids (known as essential amino acids) cannot be manufactured by certain animals from other nutrients and must be supplied in the diet. Noticing that rats failed to grow on a diet of artificial milk but grew rapidly when a small quantity of cow’s milk was added to their daily ration, Hopkins realized that no animal can live on a mixture of pure protein, fat, and carbohydrate, even when mineral salts are added, and termed the missing factors—later called vitamins—“accessory substances.”

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