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Industrial Biotransformations

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Subtilisin<br />

Bacillus licheniformis<br />

4) Process parameters<br />

yield: 73 % (= 36,6 % with reference to racemic mixture)<br />

ee: 95 %<br />

reactor type: cstr with continuous extraction of non-converted enantiomer<br />

residence time: 0.2 h<br />

space-time-yield: 14 g · L –1 ·d –1<br />

enzyme supplier: Sigma Aldrich, USA<br />

company: Coca-Cola, USA<br />

5) Product application<br />

● (S)-Phenylalanine is used as an intermediate for the synthesis of aspartame.<br />

6) Literature<br />

● Mirviss, S.B. (1987) Racemization of amino acids, US 4713470<br />

EC 3.4.21.62<br />

● Ricks, E.E., Estrada-Valdes, M.C., McLean, T.L., Iacobucci, G.A. (1992) Highly enantioselective<br />

hydrolysis of (R,S)-phenylalanine isopropyl ester by subtilisin Carlsberg. Continuous synthesis<br />

of (S)-phenylalanine in a hollow fibre/liquid membrane reactor, Biotechnol. Prog. 8, 197–203<br />

359

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