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KMID : 0545120070170050769
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Journal of Microbiology and Biotechnology
2007 Volume.17 No. 5 p.769 ~ p.773
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Optimization of Ascorbic Acid-2-Phosphate Production from Ascorbic Acid Using Resting Cell of Brevundimonas diminuta
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Shin Woo-Jung
Kim Byung-Yong
Bang Won-Gi
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Abstract
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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 120 g/l (wet weight). The optimum concentrations of AsA and pyrophosphate were 550 mM and 450 mM, respectively. The most effective buffer was 50 mM sodium formate. The optimum pH was 4.5 and temperature was 40oC. Under the above conditions, 27.5 g/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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KEYWORD
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Ascorbic acid-2-phosphate, ascorbic acid, Brevundimonas diminuta, 16S rRNA
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