Combination of hollow-fiber-supported liquid membrane and dispersive liquid-liquid microextraction as a fast and sensitive technique for the extraction of pesticides from grape juice followed by high-performance liquid chromatography

2015 ◽  
Vol 38 (11) ◽  
pp. 1959-1968 ◽  
Author(s):  
Vanessa Dutra Silva ◽  
Vanessa Simão ◽  
Adriana Neves Dias ◽  
Jeferson Schneider Carletto ◽  
Eduardo Carasek
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Hollow Fiber ◽  
High Performance ◽  
Liquid Membrane ◽  
Grape Juice ◽  
Supported Liquid Membrane ◽  
Sensitive Technique ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Determination of Verapamil in Exhaled Breath Condensate by Using Microextraction and Liquid Chromatography

2019 ◽  
Vol 15 (5) ◽  
pp. 535-541 ◽  
Author(s):  
Fariba Pourkarim ◽  
Ali Shayanfar ◽  
Maryam Khoubnasabjafari ◽  
Fariborz Akbarzadeh ◽  
Sanaz Sajedi-Amin ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Exhaled Breath Condensate ◽  
Exhaled Breath ◽  
Good Precision ◽  
Dispersive Liquid Liquid Microextraction ◽  
Breath Condensate ◽  
Liquid Microextraction

Background:Developing a simple analysis method for quantification of drug concentration is one of the essential issues in pharmacokinetic and therapeutic drug monitoring studies.Objective:A fast and reliable dispersive liquid-liquid microextraction procedure was employed for preconcentration of verapamil in exhaled breath condensate (EBC) samples and this was followed by the determination with high-performance liquid chromatography-ultraviolet detection.Methods:A reverse-phase high-performance liquid chromatography (RP-HPLC) combined with a dispersive liquid-liquid microextraction method (DLLME) was applied for quantification of verapamil in the EBC samples. The developed method was validated according to FDA guidelines.Results:Under the optimum conditions, the method provided a linear range between 0.07 and 0.8 µg.mL-1 with a coefficient of determination of 0.998. The intra- and inter-day relative standard deviation and relative error values of the method were below 15%, which indicated good precision and accuracy. The proposed method was successfully applied for the analysis of verapamil in two real samples with concentrations of 0.07 and 0.09 µg.mL-1.Conclusion:The established HPLC-UV-DLLME method could be applied for the analysis of verapamil in human EBC samples.

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