天然药物化学总论(国外英文资料).docVIP

天然药物化学总论(国外英文资料) The first chapter is general introduction First, the multiple-choice question (a) single choice (in each item of five answer options, choose a correct answer, and the correct answer The serial numbers are filled in the brackets of the questions 1. the principle of two phase solvent extraction is the use of various components in a mixture in a two-phase solvent A. ratio is different, B. distribution coefficient is different, C. separation coefficient is different D. extraction constant is different, E. dielectric constant is different The 2. principle is hydrogen bond adsorption chromatography A. ion exchange chromatography, B. gel filtration chromatography, C., polyamide chromatography D. silica gel chromatography, E., alumina chromatography 3. fractionation is suitable for () A., polar component B., polar component, C., sublimate component D. volatile components, E., lipid components 4. polyamide thin layer chromatography, the following expansion agent, the strongest expansion ability is () A. 30% ethanol B. absolute ethanol C. 70% ethanol D. acetone, E. water 5. solvent extracted from hydrophilic components of natural medicine water extract is () A. ether, B., acetic ester, C., acetone D. butanol E. ethanol 6. the unit of infrared spectrum is () A. cm -1 B. nm C. m/z D., mm, E. Delta 7. in water, it is not precipitated by ethanol A. protein, B. polypeptide, C. polysaccharide D. enzyme, E. tannin 8. the following solvents are arranged according to polarity, and the correct is () A. water acetone methanol, B. ethanol acetic ether ether C. ethanol methanol ethyl acetate D. acetone ethanol methanol E. benzene ether methanol 9. is not related to determining the purity of a compound A. determination of melting point, B. observation of crystalline shape, C. smell D. determination of swirl E., selection of more than two chromatographic conditions were detected 10. non lipophilic organic solvents are () 1A. chloroform, B., benzene, C., n-butanol