FOOD SCIENCE ›› 2009, Vol. 30 ›› Issue (21 ): 210-213.doi: 10.7506/spkx1002-6300-200921049

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Screening and Breeding of An Edible High-yield Protein-producing Strain of Candida utilis and Optimization of Its Fermentation Conditions

HE Dong-dong,ZHANG Kun-sheng*   

  1. Tianjin Key Laboratory of Food Biotechnology, Department of Food Science and Engineering, Tianjin University of Commerce,
    Tianjin 300134, China
  • Received:2009-07-21 Online:2009-11-01 Published:2010-12-29
  • Contact: ZHANG Kun-sheng E-mail:zhksheng@tjcu.edu.cn

Abstract:

This study aimed to screen and breed an edible strain of Candida utilis exhibiting high protein content via UV mutagenesis. Results showed that the exposure to 15 W UV light (at a distance of 30 cm) for 120 s led to a lethal rate of up to 89% and a new mutant strain B2 was obtained with a high protein content of 33%, which was higher than before mutagenesis (22.9%) by 37.12%. Analysis on protein content showed high genetic stability of this mutant strain after 10 passagings. The optimal B2 fermentation, which resulted in high protein content in mycelia (37%) and biomass of Candida utilis was achieved through culture at 32 ℃ with a shaking speed of 160 r/min using glucose as carbon source and (NH4)2SO4 and yeast extract powder as nitrogen sources.

Key words: UV mutagenesis, fermentation, optimization

CLC Number: