[Comparative studies on the characteristics of the Fourier-transform infrared spectra between sturgeon and shark chondroitin sulfates].

The characteristics of the Fourier-transform infrared spectra of sturgeon and shark chondroitin sulfates (CHSs) were comparatively studied. The results show that sturgeon CHS exhibits special vibrations at the wavenumbers of 1 376, 1 344, 1 310, 1 157, 883 and 856 cm(-1). Further analysis shows that shark CHS contains 6-sulfated-CHS, while sturgeon CHS contains 4, 6-disulfated CHS, indicating that sturgeon CHS could have higher biological activities in decreasing the toxicity of medicine and in killing cancer cells. In general, the two kinds of CHSs have similar infrared spectra and groups of acylamino, carboxyl, sulfate, and saccharide ring. But the N-H variable-angle vibration of acylamino group of sturgeon CHS occurs at the higher wavenumber, and the vibration intensity of carboxyl group at 1 415 cm(-1) is also stronger than that of shark CHS. Chemical analysis shows that sturgeon CHS has a higher content of glucuronic acid, suggesting that it probably could be a better kind of medical materials for the bone mineralization.