A rapid and sensitive method for quantitative determination of paclitaxel in rat plasmawas developed and validated by using ultra-performance liquid chromatography-tandemmass spectrometry (UPLC-MS/MS). Docetaxel was u...A rapid and sensitive method for quantitative determination of paclitaxel in rat plasmawas developed and validated by using ultra-performance liquid chromatography-tandemmass spectrometry (UPLC-MS/MS). Docetaxel was used as an internal standard anddiethyl ether was the liquideliquid extraction agent. Multiple reaction monitoring (MRM)mode via positive electrospray ionization (ESI) was applied to detect paclitaxel and IS at thetransitions m/z 854 / 286 and m/z 808.48 / 527.3, respectively. This method covered alinearity range from 5 to 5000 ng/ml, with the total run time of 3.0 min. In summary, a highthroughout UPLC-MS/MS method was successfully developed to measure paclitaxel in ratplasma and was applied to pharmacokinetic study after intravenous administration ofpaclitaxel.展开更多
Objective To determine ten B-vitamins in human milk by ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Methods The pretreated human milk samples were adequately separated and quan...Objective To determine ten B-vitamins in human milk by ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Methods The pretreated human milk samples were adequately separated and quantified within 11 min by UPLC-MS/MS with an Acquity UPLC HSS T3 column (2.1×100 mm, 1.8 μm). The mobile phase was a gradient of 2.5 mmol/L ammonium formate aqueous solution and acetonitrile at a flow rate of 0.35 mL/min. Stable isotope internal standards were used in the analysis, to correct for the method variability, including matrix and ionization effects. The homogenized human milk samples were deproteinzed using methanol, unknown contaminants were extracted with diethyl ether and hydrophobic phase was discarded. The analytes were monitored via ESl+ionization and detected in multiple reaction monitoring (MRM) with three acquisition functions. Results Calibration curves ranged from 0.5-160 ng/mL (thiamin, riboflavin, biotin, nicotinic acid, pyridoxine, pyridoxamine, pyridoxal), and 2.5-800 ng/mL (pantothenic acid, FAD and nicotinamide) (R^2=0.990-0.999). The relative recovery ranged from 80.1% to 120.2%; accuracy was determined to be 98.3% to 108.0%. Intra-day and inter-day variation were 3.4%-19.9% and 5.9%-18.1%, respectively. The limit of quantification (LOQ) for all vitamins was between 0.25 and 3 lag/L. Conclusion This method was successfully applied for simultaneous analysis of ten B-vitamins in human milk.展开更多
<p> <strong>Short Retraction Notice</strong> </p> <p> The paper does not meet the standards of "American Journal of Analytical Chemistry". The article has been retracted d...<p> <strong>Short Retraction Notice</strong> </p> <p> The paper does not meet the standards of "American Journal of Analytical Chemistry". The article has been retracted due to the conflicts of interests between all authors to straighten the academic record. Aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused. The full retraction notice in PDF is preceding the original paper, which is marked "RETRACTED". </p>展开更多
基金This work was financially supported from the National Nature Science Foundation of China(No.81173008)from the National Basic Research Program of China(973 Program)No.2009CB930300+1 种基金from Project for Excellent Talents of Liaoning Province(No.LR20110028)from Program for New Century Excellent Talents in University(No.NCET-12-1015).
文摘A rapid and sensitive method for quantitative determination of paclitaxel in rat plasmawas developed and validated by using ultra-performance liquid chromatography-tandemmass spectrometry (UPLC-MS/MS). Docetaxel was used as an internal standard anddiethyl ether was the liquideliquid extraction agent. Multiple reaction monitoring (MRM)mode via positive electrospray ionization (ESI) was applied to detect paclitaxel and IS at thetransitions m/z 854 / 286 and m/z 808.48 / 527.3, respectively. This method covered alinearity range from 5 to 5000 ng/ml, with the total run time of 3.0 min. In summary, a highthroughout UPLC-MS/MS method was successfully developed to measure paclitaxel in ratplasma and was applied to pharmacokinetic study after intravenous administration ofpaclitaxel.
基金supported by the National High Technology Research and Development Program of China(863 Program)(No.2010AA023004)
文摘Objective To determine ten B-vitamins in human milk by ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Methods The pretreated human milk samples were adequately separated and quantified within 11 min by UPLC-MS/MS with an Acquity UPLC HSS T3 column (2.1×100 mm, 1.8 μm). The mobile phase was a gradient of 2.5 mmol/L ammonium formate aqueous solution and acetonitrile at a flow rate of 0.35 mL/min. Stable isotope internal standards were used in the analysis, to correct for the method variability, including matrix and ionization effects. The homogenized human milk samples were deproteinzed using methanol, unknown contaminants were extracted with diethyl ether and hydrophobic phase was discarded. The analytes were monitored via ESl+ionization and detected in multiple reaction monitoring (MRM) with three acquisition functions. Results Calibration curves ranged from 0.5-160 ng/mL (thiamin, riboflavin, biotin, nicotinic acid, pyridoxine, pyridoxamine, pyridoxal), and 2.5-800 ng/mL (pantothenic acid, FAD and nicotinamide) (R^2=0.990-0.999). The relative recovery ranged from 80.1% to 120.2%; accuracy was determined to be 98.3% to 108.0%. Intra-day and inter-day variation were 3.4%-19.9% and 5.9%-18.1%, respectively. The limit of quantification (LOQ) for all vitamins was between 0.25 and 3 lag/L. Conclusion This method was successfully applied for simultaneous analysis of ten B-vitamins in human milk.
文摘<p> <strong>Short Retraction Notice</strong> </p> <p> The paper does not meet the standards of "American Journal of Analytical Chemistry". The article has been retracted due to the conflicts of interests between all authors to straighten the academic record. Aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused. The full retraction notice in PDF is preceding the original paper, which is marked "RETRACTED". </p>