Effective Production of N-Acetyl-$\beta$-glucosamine by Serratia marcescens Using Chitinadceous Waste

  • Kim, Kwang (Department of Chemical engineering, Dong-A University) ;
  • A. Louise Creagh (The Biotechnology Laboratory, Wesbrook Bldg., The University of British Columbia, Canada) ;
  • Charles A. Haynes (Biotechnology Laboratory, Wesbrook Bldg., The University of British Columbia, Canada)
  • Published : 1998.12.01

Abstract

The strain of Serratia marcescens QM B1466 produces selectively large amount of chitinolytic enzymes (about 1mg/L medium). Enzymatic hydrolysis of chitin to N-acetyl-${\beta}$-D-glucosamine (NAG) was performed with a system consisting of two hydrolases (chitinase and chitobiase) produced by optimization of a microbial host consuming chitin particles. For the development of Large-scale biological process for the production of NAG from chitinaceous waste, the selection and optimization of a microbial host, particle size of crab/shrimp chitin sources and initial induction time using chitin as a sole carbon source on chitinase/chitobiase production and NAG production were examined. Crab-shell chitin(1.5%) treated by dilute acid and , ball-milled with a normal diameter less than 250m gave the highest chitinase activity over a 7 days culture. Crude chitinase/ chitobiase solution obtained in a 10 L fed-batch fermentation showed a maximum activities of 23.6 U/mL and 5.1 U/mL, respectively with a feeding time of 3 hrs, near pH 8.5 at 30$^{\circ}C$.

Keywords

References

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