New Biotransformation Process for Production of the Fragrant Compound gamma-Dodecalactone from 10-Hydroxystearate by Permeabilized Waltomyces lipofer Cells

作者：An Jung Ung; Joo Young Chul; Oh Deok Kun^*

来源：Applied and Environmental Microbiology, 2013, 79(8): 2636-2641.

DOI：10.1128/AEM.02602-12

A new biotransformation process for the production of the flavor lactone was developed by using permeabilized Waltomyces lipofer, which was selected as an efficient gamma-dodecalactone-producing yeast among 10 oleaginous yeast strains. The optimal reaction conditions for gamma-dodecalactone production by permeabilized W. lipofer cells were pH 6.5, 35 degrees C, 200 rpm, 0.7 M Tris, 60 g/liter of 10-hydroxystearic acid, and 30 g/liter of cells. Under these conditions, nonpermeabilized cells produced 12 g/liter of gamma-dodecalactone after 30 h, with a conversion yield of 21% (wt/wt) and a productivity of 0.4 g/liter/h, whereas permeabilized cells obtained after sequential treatments with 50% ethanol and 0.5% Triton X-100 produced 46 g/liter of gamma-dodecalactone after 30 h, with a conversion yield of 76% (wt/wt) and a productivity of 1.5 g/liter/h. These values were 3.7- and 3.8-fold higher than those obtained using nonpermeabilized cells. These are the highest reported concentration, conversion yield, and productivity for the production of the bioflavor lactone.

• 出版日期2013-4