FOOD SCIENCE ›› 2006, Vol. 27 ›› Issue (3): 27-30.

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Study on Purification and Molecular Crystal Structure of Natural Curcumin

SUO  Quan-Ling, HUANG  Yan-Chun, WENG  Lin-Hong, HE  Wen-Zhi, LI  Chun-Ping, LI  Yun-Xia, HONG  Hai-Long   

  1. 1.College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010062, China;2.College of Chemical and Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China;3.College of Chemistry, Fudan University, Shanghai 200433, China
  • Online:2006-03-15 Published:2011-09-06

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Abstract: A single crystal of curcumin was obtained from the turmeric of Shuangliu County of Sichuan Province, China by usingseparation and purification technique of solvent extraction, column chromatography and recrystallization etc. The molecular andcrystal structure of curcumin were identified by IR, UV, MS, 1HNMR, 13CNMR and X-ray single crystal diffraction. Curcumincrystal belongs to monoclinic with P2/n space group. The unit cell data are: a = 1.2695(3)nm, b = 0.72075(16) nm, c=1.9960(4) nm,α=90°β=95.098°γ=90°. The molecule of curcumin damonstrates a nonlinear keto-enol tautomerism structure andthere are four curcumin molecules in each cell.

Key words: curcumin, turmeric, separation and purification, characterization, molecular structure