Gas chromatography-mass spectrometry (GC-MS) method has been developed for the simultaneous determination of monoethanolamine,diethanolamine,triethanolamine in cosmetics.The detected materials were extracted with etha...Gas chromatography-mass spectrometry (GC-MS) method has been developed for the simultaneous determination of monoethanolamine,diethanolamine,triethanolamine in cosmetics.The detected materials were extracted with ethanol by ultrasonic, then were analyzed by GC-FID and GC-MSD.The relative standard deviations (RSD) were 0.76%-3.43%,and recoveries were 85.8%-106.0%. The limit of detection was 0.05%.展开更多
An analytical method based on reversed-phase liquid chromatography has been developed for the simultaneous determination of 21 sulfonamides in cosmetics.Various cosmetic samples,including creams,lotions,powders,shampo...An analytical method based on reversed-phase liquid chromatography has been developed for the simultaneous determination of 21 sulfonamides in cosmetics.Various cosmetic samples,including creams,lotions,powders,shampoos and lipsticks,were extracted under ultrasonication,and then separated on a Waters Symmetry C18 column(5 μm,4.6 mm×250 mm) by gradient elution with methanol and 0.1% formic acid in water as the mobile phase.In the range of 1-800 ng,the calibration curves of 21 hormones showed good linearity with the correlation coefficients more than 0.999.The positive results were identified and verified by HPLC-MS/MS.The mean recoveries at the three spiked levels of various cosmetic samples were 89%-109% with the relative standard deviations of 0.7%-6.6%.展开更多
文摘Gas chromatography-mass spectrometry (GC-MS) method has been developed for the simultaneous determination of monoethanolamine,diethanolamine,triethanolamine in cosmetics.The detected materials were extracted with ethanol by ultrasonic, then were analyzed by GC-FID and GC-MSD.The relative standard deviations (RSD) were 0.76%-3.43%,and recoveries were 85.8%-106.0%. The limit of detection was 0.05%.
文摘An analytical method based on reversed-phase liquid chromatography has been developed for the simultaneous determination of 21 sulfonamides in cosmetics.Various cosmetic samples,including creams,lotions,powders,shampoos and lipsticks,were extracted under ultrasonication,and then separated on a Waters Symmetry C18 column(5 μm,4.6 mm×250 mm) by gradient elution with methanol and 0.1% formic acid in water as the mobile phase.In the range of 1-800 ng,the calibration curves of 21 hormones showed good linearity with the correlation coefficients more than 0.999.The positive results were identified and verified by HPLC-MS/MS.The mean recoveries at the three spiked levels of various cosmetic samples were 89%-109% with the relative standard deviations of 0.7%-6.6%.
