2,3-BUTANEDIOL PRODUCTION BY ENTEROBACTER-AEROGENES IN CONTINUOUS CULTURE - ROLE OF OXYGEN-SUPPLY

被引:50
作者
ZENG, AP [1 ]
BIEBL, H [1 ]
DECKWER, WD [1 ]
机构
[1] GESELL BIOTECHNOL FORSCH GMBH,NATL RES INST BIOTECHNOL,DIV BIOCHEM ENGN,MASCHERODER WEG 1,W-3300 BRAUNSCHWEIG,GERMANY
关键词
D O I
10.1007/BF00164519
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The influence of oxygen on growth and production of 2,3-butanediol and acetoin by Enterobacter aerogenes was studied in continuous culture. At all dilution rates (D) studied cell mass increased steadily with increasing oxygen uptake rate (OUR), hence the micro-aerobic cultivation was energy-limited. The biomass yield on oxygen increased with D which suggests that cells need more energy for maintenance functions at lower D. At each D an optimal OUR giving highest volumetric productivity for the sum of butanediol and acetoin was found. The optimal OUR increased with D. The occurrence of optimal OURs results from the various effects of O2 on growth and specific productivity. The latter was found to be a linear function of the specific OUR irrespective of D. At optimal OUR the cells proved to have equal specific OURs and equal specific productivities representing a fixed relationship between fermentative and respiratory metabolism. The product yield based on glucose and corrected for biomass formation was 80%. A product concentration as high as 43 g/l was obtained at D =0.1 h-1 while the volumetric productivity was the highest at D =0.28 h-1 (5.6 g/l and hour). The findings further indicate that growth and product generation are obviously non-associated phenomena. Hence, high productivities may be achievable by cell recycling and cell immobilisation systems. © 1990 Springer-Verlag.
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页码:264 / 268
页数:5
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