title: The effect of pH on colchicine conformation and structure.
abstract: The effect of various pH values between 0 and 14 on the structure and conformation of colchicine was examined using UV-vis spectrophotometry at a concentration of 1.7 x 10(-5) M and NMR techniques at a colchicine concentration of 0.1M. The complete interpretation of the colchicine NMR spectrum in D2O is given. A stable structure of the colchicine molecule in aqueous solutions at pH from 2 to 12 was demonstrated. However, during incubation at 40 degrees C colchicine was found to be stable only at pH values between 2 and 10. The significance of these data for reactions of cholchicine in regard to metabolism and interaction with macromolecules is discussed.
mesh_terms: D003078:Colchicine; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003078:Colchicine