Determination of the UV absorber 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol (UV 328) and its oxidative metabolites in human urine by dispersive liquid-liquid microextraction and GC–MS/MS

2020 ◽  
Vol 1144 ◽  
pp. 122071 ◽  
Author(s):  
Heike Denghel ◽  
Thomas Göen
Keyword(s):  
Human Urine ◽  
Uv Absorber ◽  
Oxidative Metabolites ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Determination of UV-327 and its metabolites in human urine using dispersive liquid-liquid microextraction and gas chromatography-tandem mass spectrometry

2021 ◽  
Vol 13 (35) ◽  
pp. 3978-3986
Author(s):  
Corinna Fischer ◽  
Thomas Göen
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Tandem Mass Spectrometry ◽  
Human Urine ◽  
Tandem Mass ◽  
Extraction Solvent ◽  
Chromatography Tandem Mass Spectrometry ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

A method is presented for the extraction of the UV stabilizer UV-327 and its metabolites from urine with acetonitrile (disperser solvent) and chloroform (extraction solvent), followed by instrumental analysis of the trimethylsilylated analytes.

Determination of synthetic phosphodiesterase-5 inhibitors by LC-MS2 in waters and human urine submitted to dispersive liquid-liquid microextraction

Talanta ◽  
2017 ◽  
Vol 174 ◽  
pp. 638-644 ◽  
Author(s):  
Natalia Campillo ◽  
Javier Marín ◽  
José Fenoll ◽  
Isabel Garrido ◽  
Ignacio López-García ◽  
...  
Keyword(s):  
Human Urine ◽  
Phosphodiesterase 5 Inhibitors ◽  
Dispersive Liquid Liquid Microextraction ◽  
Phosphodiesterase 5 ◽  
Liquid Microextraction

scholarly journals Determination of Ketosteroids in Human Urine Using Dispersive Liquid-Liquid Microextraction and Ultra High-Performance Liquid Chromatography-High Resolution Mass Spectrometry

2021 ◽  
Vol 76 (11) ◽  
pp. 1305-1311
Author(s):  
E. V. Dmitrieva ◽  
A. Z. Temerdashev ◽  
A. K. Osipova
Keyword(s):  
Mass Spectrometry ◽  
Human Urine ◽  
High Performance ◽  
High Resolution Mass Spectrometry ◽  
High Sensitivity ◽  
Reversed Phase ◽  
Flight Mass Spectrometry ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract A method is proposed for the determination of some ketosteroids in human urine, including enzymatic hydrolysis using β-glucuronidase from E. coli followed by dispersive liquid-liquid microextraction, derivatization of analytes with hydroxylamine, and detection by reversed-phase ultra-HPLC–quadrupole time-of-flight mass spectrometry. Optimization of extraction and derivatization conditions of the studied compounds made it possible to find that the highest recoveries were achieved using an acetone–chloroform mixture as a dispersant and an extractant, and the completeness of the derivatization reaction was achieved by thermostating the sample at 70°C for 90 min. The proposed method has high sensitivity (limits of detection in the range of 0.1–0.25 ng/mL) and a wide linearity range.

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