ABSTRACT
"Dida" is one of the most representative commonly used Tibetan medicines in treatment of hepatobilaiary diseases. To analyze and compare the content of 7 effective constituents in 11 species which are used as Dida. Integrated evaluation of them, which supply a basis for the resources exploitation for them. In this paper, most appropriate absorption wavelengths of different natural iridoid compounds, xanthones and oleanolic acid have been performed by using 3D spectrum technique. According to the results, the wavelength 210, 240 and 265 nm were used for detection of 7 effective constituents. By means of calculation, determination of 7 effective constituents indicated good linearity over the linear range with coefficients (r) of 0.999 9 respectively. The recoveries were found in the average range of 99% to 101% with RSD being less than 3%. Normalize and integrate by three-dimension the data. Get their integrated chemical quality index(ICQI). Results suggested that these plants used as Dida in Tibet medicine mostly contain these 7 effective constituents, but the different is notable. The integrated evaluation by the integrated chemical quality index (ICQI) has reference value for quality control.
ABSTRACT
A high resolution Micro-CT system for small animal imaging is introduced in this paper. Micro-focus X-ray tube with focal diameter of 100 microm and flat panel detector with imaging area of 13cm x 13cm are adopted in this system. The data acquired in rotation scanning is reconstructed with cone beam algorithm. The resolving power of the detector is measured to be 31 lp/cm at 10% of the MTF. The resolution of the Micro-CT system could achieve 185 m when the magnification factor is 1.94. Thighbone of a rabbit is used as sample imaging with the system. The trabecular bone could be imaged clearly. And the ability of small animal imaging of the system has been demonstrated.