Optimization of Ascorbic Acid-2-Phosphate Production from Ascorbic Acid Using Resting Cell of Brevundimonas diminuta

  • Shin, Woo-Jung (Department of Biotechnology and Genetic Engineering, College of Life and Environmental Sciences, Korea University) ;
  • Kim, Byung-Yong (Korean Agricultural Culture Collection(KACC), Microbial Genetics Division, National Institute of Agricultural Biotechnology) ;
  • Bang, Won-Gi (Department of Biotechnology and Genetic Engineering, College of Life and Environmental Sciences, Korea University)
  • Published : 2007.05.31


With the aim to produce ascorbic acid-2-phosphate(AsA-2-P) from L-ascorbic acid(AsA, Vitamin C), nine bacteria conferring the ability to transform AsA to AsA-2-P were isolated from soil samples alongside known strains from culture collections. Most isolates were classified to the genus Brevundimonas by 16S phylogenetic analysis. Among them, Brevundimonas diminuta KACC 10306 was selected as the experimental strain because of its the highest productivity of AsA-2-P. The optimum set of conditions for the AsA-2-P production from AsA using resting cells as the source of the enzyme was also investigated. The optimum cultivation time was 16 h and the cell concentration was 120g/l(wet weight). The optimum concentrations of AsA and pyrophosphate were 550mM and 450mM, respectively. The most effective buffer was 50mM sodium formate. The optimum pH was 4.5 and temperature was $40^{\circ}C$. Under the above conditions, 27.5g/l of AsA-2-P was produced from AsA after 36 h of incubation, which corresponded to a 19.7% conversion efficiency based on the initial concentration of AsA.



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