Abstract
The effects of industrial storage on the changes of the cell viability and the activities of intracellular alcohol dehydrogenase (ADH) and glucose-6-phosphate dehydrogenase (G6PDH) in brewer’s yeast, and the corresponding capacity for the bioconversion of ethyl-3-oxobutanoate (EOB) to ethyl (S)-3-hydroxybutanoate ((S)-EHB), were investigated. The viability of fresh brewer’s yeast cells stored in industrial circulating cooling water at 1–2°C showed 4 and 15% drop after the storage of 7 and 15 days, respectively, after which cells died rapidly. The pretreatment of the stored brewer’s yeast cells by washing and screening significantly enhanced cell viability during industrial storage. The intracellular levels of ADH and G6PDH after permeabilization of these stored cells with cetyltrimetylammonium bromide (CTAB) were much higher, which showed only slight decrease within 2 weeks during the industrial storage. When the stored cells after the permeabilization treatment was used as the biocatalyst at 90–120 g/L, EOB was converted almost completely into enantiopure (S)-EHB with an enantiomeric excess (ee) more than 99% and a yield of over 96%, by fed-batch bioconversion of 560 mM EOB within 6 h.
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This work was supported by the special fund of three items of expenditure on science and technology department of Central District in ChongQing. We also thank the Chongqing Medical University for partial financial support of this work.
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Yu, MA., Hou, Y., Gong, GH. et al. Effects of industrial storage on the bioreduction capacity of brewer’s yeast. J Ind Microbiol Biotechnol 36, 157–162 (2009). https://doi.org/10.1007/s10295-008-0483-x
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DOI: https://doi.org/10.1007/s10295-008-0483-x