A La^3+-Cu/Pt modified electrode was fabricated by electrodepositing process in CuS04 solution by adding a small amount of lanthium compound, and it was employed for direct current (DC) amperometric detection of sp...A La^3+-Cu/Pt modified electrode was fabricated by electrodepositing process in CuS04 solution by adding a small amount of lanthium compound, and it was employed for direct current (DC) amperometric detection of spectinomycin by anion-exchange chromatography. Without derivatization, this method can simultaneously determine the main component and impurities in spectinomycin pharmaceutical raw material. Ease of preparation, being applied in DC detection mode and good catalytic stability confirmed the interests of this modified electrode as amperometric sensor for the determination of spectinomycin.展开更多
In this paper, a high-performance liquid chromatography coupled with ultraviolet detection and Fourier transform-ion cyclotron resonance mass spectrometry (HPLC-UV/FrICRMS) method was described for the investigation...In this paper, a high-performance liquid chromatography coupled with ultraviolet detection and Fourier transform-ion cyclotron resonance mass spectrometry (HPLC-UV/FrICRMS) method was described for the investigation of impurity profile in moxifloxacin (MOX) drug substance and chemical reference substance. Ten impurities were detected by HPLC-UV, while eight impurities were identified by using the high accurate molecular mass combined with multiple-stage mass spectrometric data and fragmentation rules. In addition, to our knowledge, five impurities were founded for the first time in MOX drug substance.展开更多
The phosphorylation sites of two phosphorylated proteins, bovine β-casein and myelin basic protein (MBP), were identified by high performance liquid chromatography-electrospray ionization-quadrupole ion trap mass spe...The phosphorylation sites of two phosphorylated proteins, bovine β-casein and myelin basic protein (MBP), were identified by high performance liquid chromatography-electrospray ionization-quadrupole ion trap mass spectrometry (HPLC-ESI-QITMS). The tryptic digest of each protein was separated by HPLC, the molecular weight of each peptide was determined by ESI-QITMS on line, and MS/MS spectrum of each peptide was simultaneously obtained by the combination of collision-induced desorption (CID) technique and tandem mass spectrometry (MS/MS) of QITMS. The phosphorylated peptide was identified by looking into whether the difference between the observed and predicted molecular weights of a peptide is 80 u or its integral multiple. Then the phosphorylation site was identified through manual interpretation of the MS/MS spectrum of the phosphorylated peptide or automatic SEQUEST data base-searching.展开更多
A rapid and practical method for direct detection of zidovudine in high performance anion exchange chromatography (HPAEC) has been developed with integrated pulsed amperometric detection (IPAD). Dionex AS18 (250m...A rapid and practical method for direct detection of zidovudine in high performance anion exchange chromatography (HPAEC) has been developed with integrated pulsed amperometric detection (IPAD). Dionex AS18 (250mm × 2mm) and AG18 (50 mm× 2 mm) columns and 11 mmol/L NaOH solution were used for separation. Multi-step potential waveform parameters were optimized to maximize the signal-to-noise ratio (S/N). Utilizing an optimized waveform, the repeatability (intra-day) precision and intermediate (inter-day) precision are obtained with relative standard deviation (RSD) of 1.88, 2.27, respectively. The limit of quantification (LOQ) and limit of detection (LOD) were found to be 9.70, 3.0 ng/mL, respectively, with correlation coefficients of 0.9992 over concentration range 0.01-10 μg/mL. The present method was successfully applied to the determination of zidovudine in human plasma. The recoveries of plasma sample spiked by 0.7 μg/mL, 2.7 μg/mL obtained were 95.3-101.5%, with relative standard deviation (RSD) of 2.54%, 2.21%, respectively.展开更多
针对水产品农药残留分析过程中基质干扰强的现状,本研究利用多壁碳纳米管(MWCNTs)和海藻酸钠(SAL)制备了一种MWCNTs-SAL复合净化材料,建立了高效液相色谱-三重四极杆/复合线性离子阱质谱(HPLC-QTRAP-MS/MS)快速测定水产品中66种农药残...针对水产品农药残留分析过程中基质干扰强的现状,本研究利用多壁碳纳米管(MWCNTs)和海藻酸钠(SAL)制备了一种MWCNTs-SAL复合净化材料,建立了高效液相色谱-三重四极杆/复合线性离子阱质谱(HPLC-QTRAP-MS/MS)快速测定水产品中66种农药残留的分析方法。采用电喷雾装置将MWCNTs和SAL的复合溶液快速喷入CaCl2溶液中进行交联,制备MWCNTs-SAL复合材料。将乙腈作为提取溶剂,基于推杆式震荡型净化技术对提取液进行净化。采用C18RRHD色谱柱(150 mm×3.0 mm, 1.8μm)对目标化合物进行分离,在多反应监测(MRM)模式下采集质谱数据,使用基质匹配混合标准溶液进行定量分析。实验比较了MWCNTs-SAL填料与商品化填料对南美白对虾提取液的净化效果,并考察了MWCNTs-SAL用量对目标化合物净化效果的影响。实验结果表明,66种农药在0.5~50μg/L内线性关系良好,相关系数均>0.99,检出限和定量限分别为0.5~1μg/kg和1~2μg/kg;在低、中、高3个加标水平下,66种目标化合物的回收率为64.1%~107.3%,日内和日间精密度均小于20.4%。该方法经济快速,简便高效,具有较高的灵敏度和重复性,是水产品中农药残留分析的可行方法。展开更多
目的基于高效液相色谱-三重四极杆/复合线性离子阱质谱法(high performance liquid chromatography-triple quadrupole/composite linear ion trap mass spectrometry,HPLC-QTRAP MS)建立同时测定液态发酵食品中14中生物胺及其代谢物的...目的基于高效液相色谱-三重四极杆/复合线性离子阱质谱法(high performance liquid chromatography-triple quadrupole/composite linear ion trap mass spectrometry,HPLC-QTRAP MS)建立同时测定液态发酵食品中14中生物胺及其代谢物的分析方法。方法采用Waters Atlantis Premier BEH Z-HILIC色谱柱(100mm×2.1mm,1.7μm),以0.025%(V/V)甲酸水和0.1%(V/V)甲酸乙腈进行梯度洗脱,电喷雾离子源(electrospray ionization,ESI)正离子模式、多反应监测(multiple reaction monitoring,MRM)离子扫描模式、信息依赖性采集(information dependent acquisition,IDA)、增强子离子扫描(enhanced ion scanning,EPI)和EPI谱库搜索的复合模式进行测定。结果在0.05~200.00μg/L质量浓度范围内,14种生物胺及其代谢物的线性关系良好,相关系数均大于0.99;方法检出限(S/N=3)为0.15~6.00μg/L;在不同添加质量浓度(2.0、10.0、50.0μg/L)下,其回收率为75.2%~107.9%,相对标准偏差在1.98%~9.07%之间。结论该方法具有操作简便、快速、准确、灵敏等优点,可满足液态类发酵食品中14种生物胺的定性定量分析需要,为液态发酵类食品中生物胺的检测分析奠定基础。展开更多
基金supported by National Natural Science Foundation of China(No.20775070)Zhejiang Provincial Natural Science Foundation of China(No.Y407153)sponsored by Zhejiang Provincial Assay Foundation of China(No.2007F70017)
文摘A La^3+-Cu/Pt modified electrode was fabricated by electrodepositing process in CuS04 solution by adding a small amount of lanthium compound, and it was employed for direct current (DC) amperometric detection of spectinomycin by anion-exchange chromatography. Without derivatization, this method can simultaneously determine the main component and impurities in spectinomycin pharmaceutical raw material. Ease of preparation, being applied in DC detection mode and good catalytic stability confirmed the interests of this modified electrode as amperometric sensor for the determination of spectinomycin.
基金the Ministry of Public Health of the People's Republic of China(No200802038) for financial support
文摘In this paper, a high-performance liquid chromatography coupled with ultraviolet detection and Fourier transform-ion cyclotron resonance mass spectrometry (HPLC-UV/FrICRMS) method was described for the investigation of impurity profile in moxifloxacin (MOX) drug substance and chemical reference substance. Ten impurities were detected by HPLC-UV, while eight impurities were identified by using the high accurate molecular mass combined with multiple-stage mass spectrometric data and fragmentation rules. In addition, to our knowledge, five impurities were founded for the first time in MOX drug substance.
文摘The phosphorylation sites of two phosphorylated proteins, bovine β-casein and myelin basic protein (MBP), were identified by high performance liquid chromatography-electrospray ionization-quadrupole ion trap mass spectrometry (HPLC-ESI-QITMS). The tryptic digest of each protein was separated by HPLC, the molecular weight of each peptide was determined by ESI-QITMS on line, and MS/MS spectrum of each peptide was simultaneously obtained by the combination of collision-induced desorption (CID) technique and tandem mass spectrometry (MS/MS) of QITMS. The phosphorylated peptide was identified by looking into whether the difference between the observed and predicted molecular weights of a peptide is 80 u or its integral multiple. Then the phosphorylation site was identified through manual interpretation of the MS/MS spectrum of the phosphorylated peptide or automatic SEQUEST data base-searching.
基金supported by Zhejiang Provincial Natural Science Foundation of China(No.Y2110945)Zhejiang Provincial Analysis and Testing Foundation of China(No.2011C37065)
文摘A rapid and practical method for direct detection of zidovudine in high performance anion exchange chromatography (HPAEC) has been developed with integrated pulsed amperometric detection (IPAD). Dionex AS18 (250mm × 2mm) and AG18 (50 mm× 2 mm) columns and 11 mmol/L NaOH solution were used for separation. Multi-step potential waveform parameters were optimized to maximize the signal-to-noise ratio (S/N). Utilizing an optimized waveform, the repeatability (intra-day) precision and intermediate (inter-day) precision are obtained with relative standard deviation (RSD) of 1.88, 2.27, respectively. The limit of quantification (LOQ) and limit of detection (LOD) were found to be 9.70, 3.0 ng/mL, respectively, with correlation coefficients of 0.9992 over concentration range 0.01-10 μg/mL. The present method was successfully applied to the determination of zidovudine in human plasma. The recoveries of plasma sample spiked by 0.7 μg/mL, 2.7 μg/mL obtained were 95.3-101.5%, with relative standard deviation (RSD) of 2.54%, 2.21%, respectively.
文摘针对水产品农药残留分析过程中基质干扰强的现状,本研究利用多壁碳纳米管(MWCNTs)和海藻酸钠(SAL)制备了一种MWCNTs-SAL复合净化材料,建立了高效液相色谱-三重四极杆/复合线性离子阱质谱(HPLC-QTRAP-MS/MS)快速测定水产品中66种农药残留的分析方法。采用电喷雾装置将MWCNTs和SAL的复合溶液快速喷入CaCl2溶液中进行交联,制备MWCNTs-SAL复合材料。将乙腈作为提取溶剂,基于推杆式震荡型净化技术对提取液进行净化。采用C18RRHD色谱柱(150 mm×3.0 mm, 1.8μm)对目标化合物进行分离,在多反应监测(MRM)模式下采集质谱数据,使用基质匹配混合标准溶液进行定量分析。实验比较了MWCNTs-SAL填料与商品化填料对南美白对虾提取液的净化效果,并考察了MWCNTs-SAL用量对目标化合物净化效果的影响。实验结果表明,66种农药在0.5~50μg/L内线性关系良好,相关系数均>0.99,检出限和定量限分别为0.5~1μg/kg和1~2μg/kg;在低、中、高3个加标水平下,66种目标化合物的回收率为64.1%~107.3%,日内和日间精密度均小于20.4%。该方法经济快速,简便高效,具有较高的灵敏度和重复性,是水产品中农药残留分析的可行方法。
文摘目的基于高效液相色谱-三重四极杆/复合线性离子阱质谱法(high performance liquid chromatography-triple quadrupole/composite linear ion trap mass spectrometry,HPLC-QTRAP MS)建立同时测定液态发酵食品中14中生物胺及其代谢物的分析方法。方法采用Waters Atlantis Premier BEH Z-HILIC色谱柱(100mm×2.1mm,1.7μm),以0.025%(V/V)甲酸水和0.1%(V/V)甲酸乙腈进行梯度洗脱,电喷雾离子源(electrospray ionization,ESI)正离子模式、多反应监测(multiple reaction monitoring,MRM)离子扫描模式、信息依赖性采集(information dependent acquisition,IDA)、增强子离子扫描(enhanced ion scanning,EPI)和EPI谱库搜索的复合模式进行测定。结果在0.05~200.00μg/L质量浓度范围内,14种生物胺及其代谢物的线性关系良好,相关系数均大于0.99;方法检出限(S/N=3)为0.15~6.00μg/L;在不同添加质量浓度(2.0、10.0、50.0μg/L)下,其回收率为75.2%~107.9%,相对标准偏差在1.98%~9.07%之间。结论该方法具有操作简便、快速、准确、灵敏等优点,可满足液态类发酵食品中14种生物胺的定性定量分析需要,为液态发酵类食品中生物胺的检测分析奠定基础。