The effect of created local hyperosmotic microenvironment in microcapsule for the growth and metabolism of osmotolerant yeast Candida krusei.

Abstract:

:Candida krusei is osmotolerant yeast used for the production of glycerol. Addition of osmolyte such as NaCl into culture medium can increase the production of glycerol from glucose, but osmolytes may burden the glycerol separation. A coencapsulation method was suggested to create local extracellular hyperosmotic stress for glycerol accumulation. Firstly, the influence of osmotic stress induced by the addition of PEG4000 on growth and metabolism of free cell was studied in detail. Glycerol accumulation could be improved by employing PEG4000 as osmoregulator. Secondly, cells and PEG4000 were coentrapped in NaCS/PDMDAAC capsules to create local hyperosmotic stress. The effects of local hyperosmotic microenvironment on the cell growth and metabolism were studied. The coentrapment method increased the glycerol concentration by 25%, and the glycerol concentration attained 50 gL⁻¹ with productivity of 18.8 gL⁻¹Day⁻¹ in shake flask. More importantly, the glycerol could be directly separated from the encapsulated cells. The entrapped cells containing PEG4000 were also cultivated for 15 days in an airlift reactor. The yield and productivity were ca. 35% and 21 gL⁻¹Day⁻¹, respectively.

journal_name

Biomed Res Int

authors

Chen G,Yao S

doi

10.1155/2013/467263

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

467263

eissn

2314-6133

issn

2314-6141

journal_volume

2013

pub_type

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