目的建立半夏及其伪品虎掌南星中水麦冬酸的专属性检测方法。方法样品经水超声提取,利用高分离度快速液相色谱-三重四极杆质谱(rapid resolution liquid chromatography coupled with triple quadrupole electrospray tandem mass spect...目的建立半夏及其伪品虎掌南星中水麦冬酸的专属性检测方法。方法样品经水超声提取,利用高分离度快速液相色谱-三重四极杆质谱(rapid resolution liquid chromatography coupled with triple quadrupole electrospray tandem mass spectrometry,RRLC-QQQ/MS)检测水麦冬酸。采用Agilent SB-C18(2.1 mm×50 mm,1.8μm)色谱柱,以乙腈-0.1%甲酸(5∶95)为流动相。柱温30℃,体积流量0.2 m L/min,进样量1μL。离子化模式为ESI-,选择m/z187→143和m/z187→99作为检测离子对,进行多反应监测。结果检出限为4.6μg/L。11批半夏中有3批检出水麦冬酸,7批虎掌南星均检出水麦冬酸,半夏中水麦冬酸含量低于虎掌南星。结论所建方法专属、准确、快速、简便,可为半夏的质量控制提供参考。展开更多
Three-Coulomb-wave method is employed to treat the process of (e, 2e) simultaneous ion- ization and excitation to the n=2 state of helium, with radial and angular correlated wave-function of He target. The triple di...Three-Coulomb-wave method is employed to treat the process of (e, 2e) simultaneous ion- ization and excitation to the n=2 state of helium, with radial and angular correlated wave-function of He target. The triple differential cross sections are calculated and analyzed in very asymmetric coplanar geometry at incident energies of 5.50, 1.50 and 0.57 keV. Results are compared with the absolute measurements and the theoretical first and second Born approximation. The present triply differential cross section (TDCS) is found to be in good agreement with experimental data qualitatively. The distinguishing feature noted in TDCS structure is the presence of intense recoil peak that for certain parameters is even larger than the binary peak, an unusual feature for the single-ionization process at high and intermediate energies.展开更多
文摘目的建立半夏及其伪品虎掌南星中水麦冬酸的专属性检测方法。方法样品经水超声提取,利用高分离度快速液相色谱-三重四极杆质谱(rapid resolution liquid chromatography coupled with triple quadrupole electrospray tandem mass spectrometry,RRLC-QQQ/MS)检测水麦冬酸。采用Agilent SB-C18(2.1 mm×50 mm,1.8μm)色谱柱,以乙腈-0.1%甲酸(5∶95)为流动相。柱温30℃,体积流量0.2 m L/min,进样量1μL。离子化模式为ESI-,选择m/z187→143和m/z187→99作为检测离子对,进行多反应监测。结果检出限为4.6μg/L。11批半夏中有3批检出水麦冬酸,7批虎掌南星均检出水麦冬酸,半夏中水麦冬酸含量低于虎掌南星。结论所建方法专属、准确、快速、简便,可为半夏的质量控制提供参考。
文摘Three-Coulomb-wave method is employed to treat the process of (e, 2e) simultaneous ion- ization and excitation to the n=2 state of helium, with radial and angular correlated wave-function of He target. The triple differential cross sections are calculated and analyzed in very asymmetric coplanar geometry at incident energies of 5.50, 1.50 and 0.57 keV. Results are compared with the absolute measurements and the theoretical first and second Born approximation. The present triply differential cross section (TDCS) is found to be in good agreement with experimental data qualitatively. The distinguishing feature noted in TDCS structure is the presence of intense recoil peak that for certain parameters is even larger than the binary peak, an unusual feature for the single-ionization process at high and intermediate energies.