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http://dx.doi.org/10.12925/jkocs.2016.33.3.498

β-Galactosidase-catalyzed Synthesis of 1, 2-Hexanediol Galactoside and its Purification using Ethyl Acetate Extraction followed by Silica Gel Chromatography  

Kim, Yi-Ok (Department of Biotechnology, Korea National University of Transportation)
Jung, Kyung-Hwan (Department of Biotechnology, Korea National University of Transportation)
Publication Information
Journal of the Korean Applied Science and Technology / v.33, no.3, 2016 , pp. 498-506 More about this Journal
Abstract
1, 2-Hexanediol galactoside (HD-gal) has been previously synthesized from 1, 2-hexanediol (HD), in which recombinant ${\beta}$-galactosidase (${\beta}$-gal) of Escherichia coli (E. coli) was used for transgalactosylation reaction. In this study, a method for HD-gal purification from the reaction mixture was particularly investigated. Using ${\beta}$-gal-containing E. coli, HD-gal was synthesized from 75 mM HD for 48 hr under 300 g/l lactose concentration. Then, HD-gal synthesis from HD was confirmed by TLC analysis, and the existence of E. coli ${\beta}$-gal during 48 hr-reaction was also confirmed by Western blotting, in which the conversion yield of HD to HD-gal reached about 94% during 48 hr. To establish an efficient method for HD-gal purification, we carried out the solvent extraction of the reaction mixture, followed by silica gel chromatography, particularly in order to remove the residual HD. Two water-immiscible solvents, such as methylene chloride and ethyl acetate, were investigated comparatively to find out appropriate solvent. Then, it was found that residual HD was almost removed when ethyl acetate extraction of water phase of reaction mixture was carried out four times. Subsequently, silica gel chromatography was carried out, and purified HD-gal could be finally obtained. The production yield for HD-gal from 75 mM HD was $8.9{\pm}0.6%$ (n=3) (mole basis) or $21.1{\pm}1.4%$ (n=3) (weight basis). For further study, using purified HD-gal, we will investigate the minimum inhibitory concentrations (MICs) of HD-gal against bacteria. In addition, cytotoxicity to human skin cells of HD-gal will be examined.
Keywords
1, 2-Hexanediol Galactoside; Ethyl Acetate Extraction; Silica Gel Chromatography; ${\beta}$-Galactosidase; Cosmetic preservative;
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