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Química Nova

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NASCIMENTO, Maria da Graça; ZANOTTO, Sandra Patricia; MELEGARI, Sílvia Pedroso  and  MORAN, Paulo J. S.. Protection studies of saccharomyces cerevisiae cells for the use in reduction reactions in organic media. Quím. Nova [online]. 2002, vol.25, n.4, pp.567-571. ISSN 0100-4042.

New methodologies for protection of Saccharomyces cerevisiae (FP) cells when supported in montmorillonite K10 (K10), recovered or not with gelatin (G) and in the presence or absence of sucrose (S) are presented. These systems were used for the enantioselective reduction of ethyl acetoacetate and a-chloroacetophenone in hexane, under FP/K10/G/S and FP/S at 20oC during 24 hours, affording S-(+)-ethyl-3-hydroxybutanoate in 100% conversion and 99% ee, and R-(-)-2-chloro-1-phenylethanol 79% and 78% ee at 20 and 30 oC, respectivelly.

Keywords : biotransformations; baker's yeast; enantioselective reduction.

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