Quantitative Determination and Stability of Curcuminoid Pigments from Turmeric (Curcuma longa L.) Root

강황 (Curcuma longa L.) 색소의 정량 및 안정성

  • Kim Kwan-Su (Dept. of Medicinal Plant Resources, Mokpo National University) ;
  • Choung Myoung-Gun (Dept. of Pharmacognosy Material Development, Samcheok National University) ;
  • Park Si-Hyung (Dept. of Medicinal Plant Resources, Mokpo National University)
  • 김관수 (목포대학교 응용생명과학부) ;
  • 정명근 (삼척대학교 생약자원개발학과) ;
  • 박시형 (목포대학교 응용생명과학부)
  • Published : 2005.11.01

Abstract

Three curcuminoids [curcumin (CUR), demethoxycurcumin(DEM), bisdemethoxycurcu in (BIS)] are major yellow pigments in turmleric (Curcuma longa L.) root. Contents of curcuminoids in turmeric roots collected from 6 locations were analyzed using, high performance liquid chromatography (HPLC) equipped with reversed-phase column, an UV-Vis detector at 420nm, and eluted with a mixture of acetonitrile: $0.1\%$ acetic acid in water (50 : 50, v/v) as mobile phase. The stability of curcuminoid pigments in $80\%$ methanol extract solution were investigated during storage in a freezer at $-20^{\circ}C$, room temperature in the dark, and light condition. Calibration curves for the determination of curcuminoids were made with significant linearity $(r^2=0.999**)$. Average content of total curcuminoids was 171.5 mg/g, with 91.6 mg/g of CUR, 56.9 mg/g of DEM, and 23.0 mg/g of BIS. Amount of curcuminoids during storage in a freezer was almost not changed while those in room temperature wert reduced and rapid degradation appeared after 60 days. Within 90 days, about $50\%$ curcuminoid decreased in the dark and about $70\%$ in the light condition, indicating the decomposition of curcuminoid pigments followed under light and heat.

강황 (Curcuma longa L.) 색소의 curcuminoid 성분인 curcumin (CUR), demethoxycurcumin (DEM), bisdemethoxy-curcumin (BIS)의 정량분석을 위해 유의성있는 검량선$(r^2=0.9999**)$을 작성하였다. 사용된 HPLC는 역상칼럼을 장착하고 420nm의 UV 검출조건, 그리고 이동상으로 acetonitrile: $0.1\%$ acetic acid /water의 50 : 50 혼합용액을 이용하는 조건으로 분석조건이 확립되었다. 국내 6개 지역에서 재배된 강황들의 색소성분 함량분석 결과, CUR가 91.6mg/g으로 가장 높았으며 DEM은 56.9 mg/g이고 BIS는 23.0 mg/g으로 가장 낮게 나타났으며 총량은 평균 171.5 mg/g이었다. 강황 색소추출물의 저장시기별 색소성분의 함량 변화를 조사한 결과 $-20^{\circ}C$ 냉동저장은 거의 손실이 없었으나 상온저장은 60일 이후 급격한 감소율을 보였다. 저장 90일째의 색소성분은 암조건에서 약 $50\%$, 명조건에서 약 $30\%$만이 남아 있어 curcuminoid색소성분은 빛과 온도에 의해 분해가 촉진되는 것을 알 수 있었다.

Keywords

References

  1. Ansari, M. J., S. Ahmad, K. Kohli, J. Ali, and R. K. Khar. StabilityindicatingHPfLC determination of curcumin in bulk drug andpharmaceutical formulations. J. Pharm. Biomed. Anal. 39(1-2):132-138.
  2. Bernabe-Pineda, M., M. T. Ramirez-Silva, M. Romero-Romo, E.Gonzalez-Vergara, and A. Rojas-Hernandez. 2004. Determinationof acidity constants of curcumin in aqueous solution andapparentrate constant of its decomposition. Spectrochimica Acta Part A:Molecular and Biomolecular Spectroscopy 60(5): 1091-1097.
  3. He, X. G, L. Z. Lin, L. Z. Lian, and M. Lindenmaier. 1998. Liquidchromatography-electrospray mass spectrometric analysis of curcuminoidsand sesquiterpenoids in turmeric (Curcuma longa L.).J. Chromatography A 818(1): 127-132.
  4. Jeong, S. H., K. S. Chang, and Y. J. Kim.2004. Optimization of curcuminextractionfromturmeric (Curcuma longa L.) usingsupercriticalfluid CO2• FoodEngineering Progress 8(1): 47-52.
  5. Peret-Almeida, L., A. P.F. Cherubino, R. J. Alves, L. Dufosse, andM.B. A. G16ria. 2005. Separation and determination of the physicochemicalcharacteristics of curcumin, demethoxycurcumin andbisdemethoxycurcumin.Food Research International 38(8-9) : 10391044.
  6. Sharma, R. A., A. J. Gescher, andW.P. Steward. 2005. Curcumin: Thestoryso far. Eur. J. Cancer 41(13) : 1955-1968.
  7. Soh, H. O. 1998. A study of the stability and dyeing condition in theCurcuma tongaL. Kor. J Costume39: 78-79.
  8. Tang, W. and G Eisenbrand. 1992. Chinese Drugs of Plant Origin.Chemistry, Pharmacology, and Use in Traditional and ModemMedicine. Chapter 52. Curcuma spp. Springer-Verlag. Berlin. pp.401-415.
  9. Wang, Y. 1.,M. H. Pan, A. L. Cheng, L. 1.Lin, Y. S. Ho, C. Y. Hsieh,and 1. K. Lin. 1997. Stability of curcumin in buffer solutions andcharacterization of its degradation products. J Pharm. Biomed.Anal. 15(12): 1867-1876.
  10. ~*r:pIf~JfiD {r:p3'j[2js:1I!} *~. 1996. r:p3'j[2js:1I!. 0(7767).J::iliWJ*t5tlJfiji±JJi&JTrr 8: 631-637.