scholarly journals Sample Preparation and Determination of Acetylcholine in Corneal Epithelium Cells Using Liquid Chromatography-Tandem Mass Spectrometry

2003 ◽  
Vol 41 (3) ◽  
pp. 151-156 ◽  
Author(s):  
J. L. E. Reubsaet ◽  
E. Ahlsen ◽  
K. G. Haneborg ◽  
A. Ringvold
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Sample Preparation ◽  
Tandem Mass Spectrometry ◽  
Corneal Epithelium ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Epithelium Cells

Comparison of different sample preparation procedures for multiclass determination of selected veterinary drug, coccidiostat and insecticide residues in eggs by liquid chromatography-tandem mass spectrometry

2014 ◽  
Vol 6 (9) ◽  
pp. 3034-3044 ◽  
Author(s):  
Marta Piatkowska ◽  
Piotr Jedziniak ◽  
Jan Zmudzki
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Sample Preparation ◽  
Tandem Mass Spectrometry ◽  
Veterinary Drug ◽  
Tandem Mass ◽  
Insecticide Residues ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

QuEChERS and zirconium-coated silica SPE in a multiresidue method for the analysis of veterinary drug residues and other contaminates in eggs by LC-MS/MS.

scholarly journals Determination of Cyclamate in Foods by Ultraperformance Liquid Chromatography/Tandem Mass Spectrometry

2008 ◽  
Vol 91 (5) ◽  
pp. 1095-1102 ◽  
Author(s):  
Robert Sheridan ◽  
Thomas King
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Sample Preparation ◽  
Tandem Mass Spectrometry ◽  
Limit Of Detection ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Limit Of Quantitation ◽  
Liquid Chromatography Tandem Mass

Abstract A highly sensitive and selective method that requires minimal sample preparation was developed for the confirmation and quantitation of cyclamate in a variety of foods by high-performance liquid chromatography/tandem mass spectrometry (HPLC/MS/MS). Sample preparation consisted of homogenization followed by extraction and dilution of cyclamate with water. HPLC separation was achieved using a bridged ethyl hybrid C18 high-pressure column with a mobile phase consisting of 0.15 acetic acid and methanol. Under electrospray ionization negative conditions, quantitation was achieved by monitoring the fragment m/z 79.7 while also collecting parent ion m/z 177.9. Two food matrixes, diet soda and jelly, were subjected to a validation procedure in order to evaluate the applicability of the method. The cyclamate limit of detection for both matrixes was determined to be 0.050 g/g with a limit of quantitation of 0.150 g/g. The correlation coefficient of the calibration curves was >0.9998 from 0.0005 to 0.100 g/mL. The method has been used for the determination of cyclamate in several foods and the results are presented.

Method Validation for Quantitative Analysis of Metribuzin in Wheat by Liquid Chromatography–Tandem Mass Spectrometry

2020 ◽  
Vol 59 (1) ◽  
pp. 47-54
Author(s):  
Dipak Kumar Hazra ◽  
Aloke Purkait ◽  
Durgesh Raghuwanshi ◽  
K Sri Rama Murthy
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Sample Preparation ◽  
Tandem Mass Spectrometry ◽  
Accurate Determination ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Limit Of Quantitation ◽  
Liquid Chromatography Tandem Mass

Abstract A high-performance liquid chromatography–tandem mass spectrometry (LC–MS/MS) method was developed and validated for the accurate determination of metribuzin levels in wheat. The widespread use of this herbicide in the production of wheat is of concern and could follow as well as the need for methodology, which required simple sample preparation being needed. Validation of method was done as per single laboratory validation approach. Samples were extracted through a modified quick, cheap, effective, rugged and safe technique. Sample preparation includes extraction by acetonitrile solvent and cleans up by C18, primary secondary amine and anhydrous MgSO4 for dispersive solid-phase extraction. LC–MS/MS was calibrated at 5 calibration levels with high correlation coefficients (r2) >0.995. Limit of detection and limit of quantitation of metribuzin were 0.01 and 0.03 μg/g, respectively. The mean recovery percentages lie in the range of 87–97 with standard deviation for repeatability (RSDa) <10% at three spiking levels (0.03, 0.15 and 0.30 μg/g). Combined uncertainty (U = 0.0017) and expanded uncertainty (2U = 0.0033) were fairly consequential. The method may successfully be applied to other cereals samples for determination of metribuzin.

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