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- W2385877892 abstract "An integrative coupling technique of headspace liquid phase microextraction ( HS-LPME) and micellar electrokinetic capillary chromatography ( MEKC ) was proposed and applied to analyze p-hydroxybenzoate preservatives in medicine. The analytical technique was performed with one separation capillary to fix the acceptor volume,hold the microextraction droplet,inject the concentrated analytes and separate the analytes by MEKC. First,a mixed solvent of 1∶4( V/V) dimethylsulfoxide-toluene ( avoid contact with skin) was injected into the whole separation capillary with the volume about 1 μL from its outlet by pressure,then a running buffer solution of 20 mmol/L sodium tetraborate ( pH 9. 3) containing 150 mmol/L sodium dodecylsulfate was injected at 35 kPa for 25 s in the same direction and a 1 μL microextraction droplet was formed at the inlet of the capillary. The HS-LPME was carried out in a 14-mL sample viel containing 8 mL sample solution and 0. 3 g/mL NaCl at 90 ℃ for 30 min. At last,the concentrated analytes were injected at 10 cm height difference for 20 s and separated by MEKC. The enrichment factors of methyl-,ethyland propyl-parabens ranged from 25 to 86,the limits of detection were from 0. 01 to 0. 05 mg/L,and the recoveries were in the range of 92. 2% 107. 0% . The integrative coupling technique was able to concentrate analytes and eliminate the matrix interference effectively,and was suitable for the determination of neutral analytes in complex samples by CE" @default.
- W2385877892 created "2016-06-24" @default.
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- W2385877892 date "2010-01-01" @default.
- W2385877892 modified "2023-09-25" @default.
- W2385877892 title "Determination of p-Hydroxybenzoate Preservatives in Medicine by Headspace Liquid Phase Microextraction and Micellar Electrokinetic Capillary Chromatography" @default.
- W2385877892 hasPublicationYear "2010" @default.
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