FIELD: chemistry.
SUBSTANCE: present invention refers to method of producing optically active monatin of identical configurations in positions 2 and 4 to be applied as sweetener. Isomerisation procedure implies that monatin of different configurations in positions 2 and 4 is isomerised in 2-nd position with aldehyde added in mixed solvent of water and organic solvent with pH 4 to 11. It is accompanied with simultaneous crystallisation of monatine with identical configurations in 2-position and 4-position.
EFFECT: development of effective method of producing optically active monatin isomers.
12 cl, 13 ex
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