Journal of the Society of Cosmetic Scientists of Korea (대한화장품학회지)

Society of Cosmetic Scientists of Korea (대한화장품학회)
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Water-holding Capacity and Antimicrobial Activity and of 1, 2-Hexanediol Galactoside Synthesized by β-Galactosidase

베타-갈락토시데이즈를 이용하여 합성한 1, 2-Hexanediol Galactoside의 보습력과 항균력에 대한 연구

  • Kim, Yi-Ok (Department of Biotechnology, Korea National University of Transportation) ;
  • Jung, Kyung-Hwan (Department of Biotechnology, Korea National University of Transportation)
  • 김이옥 (한국교통대학교 생명공학과) ;
  • 정경환 (한국교통대학교 생명공학과)
  • Received : 2017.11.21
  • Accepted : 2017.12.22
  • Published : 2017.12.30
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Abstract

We carried out the enzymatic synthesis of 1, 2-hexanediol galactoside (HD-gal) by transgalactosylation reaction using recombinant Escherichia coli ${\beta}-galactosidase$ (${\beta}-gal$). The amounts of ${\beta}-gal$ and 1, 2-hexanediol (HD), pH, and temperature, respectively, were first optimized (${\beta}-Gal$, 4.8 U/mL; HD, 75 mM; pH, 7.0; temperature, $37^{\circ}C$). Under these optimal conditions, about 96% HD was converted to HD-gal. When we investigated the water holding capacities (WHCs) of HD and HD-gal using pig epidermis in the concentrations of 84.4, 126.6, 168.8, 211.0 mM, WHC of HD-gal was superior to HD. In particular, at 168.8 mM HD and HD-gal, WHC of HD-gal showed about 20% greater than that of HD. However, it was observed that MIC values against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus of HD-gal were about three to ten times greater than those of HD, although MIC value of HD-gal against Enterococcus faecalis was almost the same as that of HD. Finally, it was concluded that the covalent bonding of a galactose molecule to HD (transgalactosylation) resulted in an increase in WHC of HD-gal and a decrease in anti-bacterial activity.

재조합 대장균의 ${\beta}-galactosidase$ (${\beta}-gal$)을 이용하여 transgalactosylation 반응으로 1, 2-hexanediol galactoside (HD-gal) 합성을 수행하였다. 먼저, 합성 반응을 수행할 때의, ${\beta}-gal$의 양, 1, 2-hexanediol(HD)의 양, 반응 pH, 반응 온도 등 반응조건을 최적화하였다. ${\beta}-Gal$은 4.8 U/mL, HD는 75 mM, pH는 7.0, 온도는 $37^{\circ}C$의 조건이 최적 합성 조건이었으며, 이때, 약 96%의 HD가 HD-gal로 conversion 되었다. 그리고, 돼지 epidermis를 이용하여 HD와 HD-gal의 water holding capacity (WHC)를 비교 측정하여 보았는데, 이때, epidermis 표면에 HD와 HD-gal을 84.4, 126.6, 168.8, 211.0 mM을 처리하였으며, 84.4, 126.6, 168.8 mM의 HD와 HD-gal을 처리하였을 경우 HD-gal이 HD보다 더 큰 WHC 값을 보여 주었고, 168.8 mM의 경우에는 HD-gal이 HD와 비교하여 최대 약 20% 정도의 더 큰 WHC 값을 보여 주었다. 그러나, HD-gal의 MIC (minimal inhibitory concentration) 값을 측정해 본 결과, Enterococcus faecalis의 경우에는 HD의 MIC와 같았으나, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus의 경우에는 약 3배에서 10배까지 HD-gal의 MIC 값이 HD에 비하여 증가되는 현상이 관찰되었다. 결론적으로, HD의 transgalactosylation 반응으로 인하여 합성된 HD-gal의 보습력은 HD에 비하여 증가되고, HD-gal의 항균력은 HD와 비교하여 감소하는 현상을 관찰하였다.

Keywords

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