Hamdullah KILIÇ, Mesut TAŞKIN, Kani ZİLBEYAZ, Namudar I. KURBANOĞLU, Esabi B. KURBANOĞLU

Production of (S)-(-)-1-(1-(1'-napthyl) ethanol by Rhodotorula glutinis isolate using ram horn peptone

The bioreduction of 1-acetonaphthone 1 by locally isolated Rhodotorula glutinis strains using ram horn peptone (RHP) gave (6')-(-)-l-(l'-naphthyl) ethanol (2), an important pharmaceutical intermediate. R. glutinis strains were isolated from the water of fermented Salix leaves. Optimum fermentation conditions for the production of 2 were 200 rpm, 32 °C, and pH 6.5. The production of 2 with excellent enantiomeric excess (>99%), and good conversion (100%) and yield (78%) under optimum conditions was achieved up to preparative scale via a fermenter. Wide temperature, pH, time, and agitation ranges did not affect the enantiomeric excess (ee) of the bioreduction product. A simple process for the isolation of R. glutinis was also developed.

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