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

Society of Cosmetic Scientists of Korea (대한화장품학회)
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Synthesis of Novel Kojic Acid Derivative and Its Anti-pigmentation Effect

코직산 유도체의 합성과 미백효과

  • 김기호 ((주)바이오랜드 생명공학연구소) ;
  • 김기수 ((주)바이오랜드 생명공학연구소) ;
  • 김진국 ((주)바이오랜드 생명공학연구소) ;
  • 한창성 ((주)바이오랜드 생명공학연구소) ;
  • 김영희 ((주)바이오랜드 생명공학연구소) ;
  • 박수남 (서울산업대학교 정밀화학과)
  • Published : 2004.11.01
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Abstract

Kojic acid is well known for its anti-pigmentation effect with tyrosinase inhibition activity. However, kojic acid is a unstable compound. In order to improve stability, kojic acid derivative, kojic acid $6-O-2',3',4',6'-tetraacetyl-{\beta}-D-glucopy-ranoside\;(KTGP)$, was synthesized with $O-pentaacetyl-{\beta}-D-glucose$ through the regio- and stereo-selective glycosylation of 6-OH group of kojic acid. High yield $(80\%)$ was obtained by the use of Lewis acid and organic base in nonpolar solvent. Hydrolysis of KTGP with the aid of sodium methoxide in methanol afforded kojic acid $6-O-{\beta}-D-glucopyranoside$ (KGP), which was confirmed by $^1H-NMR\;and\;^{13}C-NMR$ KGP is freely soluble in water and soluble in methanol and ethanol. Inhibition activity of KGP for tyrosinase was investigated by measuring the activity of mushroom tyrosinase compared with those of ascorbic acid, kojic acid, and arbutin. The free radical-scavenger activity was determined by the 1,1-diphenyl- 2-picrylhydrazyl (DPPH) assay. In toxicity assay, KGP was much less toxic than kojic acid and arbutin, Therefore, glycosylation of kojic acid may be useful for the development of stable kojic acid derivatives.

코직산은 티로시나제의 억제에 의한 미백효능을 가지는 물질로 널리 알려져 있으나, 낮은 안정성으로 인하여 화장품 원료로의 사용에 제약을 갖고 있다. 이에 본 연구에서는 유기합성적 방법에 의해 안정성과 미백효과를 가지는 코직산 유도체를 고수율로 합성하였다. $O-pentaacetyl-{\beta}-D-glucose를$ 루이스산과 유기염기를 이용하여 위치 선택적이고, 입체 선택적으로 코직산의 6번 위치에 도입시켜 $kojic\;acid\;6-O-2',3',4',6'-tetraacetyl-{\beta}-D-glucopyranoside\;(KTGP, 80{\%})를$ 합성한 후, 가수분해하여 kojic acid 6-0-f-D-glucopyranoside $(KGP, 70\%)를$ 수득하였다. $^1H-NMR과\;^{13}C-NMR$ 분석으로 구조를 확인하였다. KGP를 가지고 티로시나제 활성저해, 프리라디칼소거능과 멜라닌합성저해 실험을 실시하였고, 그 결과 티로시나제 활성저해와 프리라디칼소거능에서 코직산보다 높거나 비슷한 활성을 보여주었다. 코직산 수준의 미백효능을 확인하였기에 유기 화학적으로 합성된 KGP의 미백원료로서 사용을 기대할 수 있다.

Keywords

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