| 摘要 |
529,612. Amino acids. CORN PRODUCTS REFINING CO. June 5, 1939, Nos. 16420 and 16421. Convention dates, June 3, 1938 and Sept. 19, 1938. [Class 2 (iii)] Leucine is obtained from a solution resulting from the hydrolysis of maize gluten with an acid, such as hydrochloric acid, by adjusting the pH value of the solution to 0.9-1.0, and removing the precipitated leucine. The hydrolysate is first concentrated to about 25-26.5‹ BaumÚ, and the solution after adjustment of the pH value is cooled to about 70-80‹F. Humin substances are first removed by centrifuging the hydrolysate, and glutamic acid may also be removed, prior to the precipitation of the leucine, by adjusting the density and temperature of the solution as described in Specification 522,365. The filtrate, after removal of glutamic acid and leucine, is adjusted to a pH value of 2.4 to 3.4, to precipitate tyrosine. Examples are given.
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