| 摘要 |
PURPOSE: To easily obtainγ-type glycine useful as a processed food additive, a raw material for medicines/agrochemicals, etc., in an industrially advantageous way by keepingα-type glycine in an aqueous glycine solution at a specified pH level and transforming theα-type glycine intoγ-type glycine pin crystal state to effect crystallization without the need of adding any freshγ-type glycine. CONSTITUTION: Alpha-type glycine (A) is kept in an aqueous glycine solution adjusted to pH 7-14 (esp. pH10-14) by the addition of an additive (B) such as hydroxide, carbonate or oxide of an alkali (alkaline earth) metal, or glycine alkali (alkaline earth) metal salt (for example, the additive B is added to an aqueous glycine solution to effect pH adjustment followed by addition of theα-type glycine and keeping theα-type glycine in the solution) to effect transformation of theα-type glycine in crystal state into the objectiveγ-type glycine, according as necessary, under heating.
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