scholarly journals Erratum to: Investigation of metal-oligonucleotide complexes by nanoelectrospray tandem mass spectrometry in the positive mode

2005 ◽  
Vol 16 (5) ◽  
pp. 799-799
Author(s):  
Selina T. M. Monn ◽  
Stefan Schürch
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Tandem Mass ◽  
Positive Mode ◽  
Nanoelectrospray Tandem Mass Spectrometry

scholarly journals DEVELOPMENT AND VALIDATION OF LIQUID CHROMATOGRAPHY COUPLED WITH TANDEM MASS SPECTROMETRY METHOD FOR ESTIMATION OF LENVATINIB IN HUMAN PLASMA

2017 ◽  
Vol 10 (7) ◽  
pp. 120
Author(s):  
Srikanth I ◽  
Prameela Rani A
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Human Plasma ◽  
Internal Standard ◽  
Correlation Coefficients ◽  
Tandem Mass ◽  
Liquid Chromatography Tandem Mass ◽  
Positive Mode ◽  
Development And Validation

Objective: This study was to develop and validate a liquid chromatography–tandem mass spectrometry (LC–MS/MS) for the quantification of lenvatinib (LT) in human plasma.Methods: A simple, sensitive and specific LC–MS/MS method was developed for quantification of LT in human plasma using LTD4 as internal standard (IS). The analytical method consists of liquid–liquid extraction of plasma sample followed by the determination of LT by a LC–MS/MS. The analyte was separated on a Zorbax Eclipse XDB-C18 (150×4.6 mm, 5 μ) column with an isocratic mobile phase of acetontrile:0.1% formic acid (80:20 v/v) at a flow rate of 0.6 mL/minutes. The protonated ions were formed by a turbolon spray in a positive mode were used to detect analyte and IS. The MS/MS detection was made by monitoring the fragmentation of m/z 427.10→370.10 for LT and m/z 430.30→370.10 for IS on a MS.Result: The method was validated with the correlation coefficients of (r2) ≥0.995 over a linear concentration range of 10.20-501.60 pg/mL. This method demonstrated intra- and inter-day precision within 1.06-2.42% and 0.03-0.55% and accuracy within 95.64-100.08% and 97.16-100.07%.Conclusion: This method is suitable and convenient to pharmacokinetics and bioavailability studies for estimation of LT in biological samples by LC–MS/MS.

Structural Characterization of Nitrated 2′-Hydroxychalcones by Electrospray Ionization Tandem Mass Spectrometry

2009 ◽  
Vol 15 (5) ◽  
pp. 605-616 ◽  
Author(s):  
Ana I.R.N.A. Barros ◽  
Fernando M. Nunes ◽  
Cristina Barros ◽  
Artur M.S. Silva ◽  
M. Rosário M. Domingues
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Electrospray Ionization ◽  
Structural Information ◽  
Tandem Mass ◽  
Substitution Pattern ◽  
Esi Ms ◽  
Positive Mode ◽  
Fragmentation Patterns ◽  
Product Ion Spectra

Isomeric 2′-hydroxychalcones bearing nitro and methoxy groups in different positions of their skeleton were analyzed by tandem mass spectrometry (MS/MS) with electrospray ionization (ESI), in positive mode. Collision-induced dissociation of the protonated molecules, [M + H]+, formed under electrospray conditions were studied and it was found that the product ion spectra of these chalcones presented different fragmentation patterns depending on the position of the substituents on the molecule. The product ion spectra (ESI-MS/MS) of the B ring ortho-nitro substituted 2′-hydroxychalcone and of the 4′-methoxychalcones showed loss of OH•, 2OH• and combined losses of OH• and H2O. These fragment ions were absent in the spectra of the respective meta- and para isomers. The observed differences in the product ion spectra of these nitrochalcones allowed identification of the o-nitro derivatives. Distinction between the meta- and para-derivatives was not achieved. Chalcones bearing 6′-methoxy substituents showed distinct fragmentation from the one observed for their isomers, 4′-methoxychalcones, since they present only one fragment ion, a typical (0,αA – H)+ and, therefore, do not allow detailed structural information to be obtained, nor to differentiate between the o-, m- or p-nitro isomers. Overall, it was found that small changes in the substitution pattern of chalcones change their fragmentation considerably in the ESI-MS/MS, and that these features permit the differentiation of specific isomers of these 2′-hydroxynitrochalcones.

Enantioselective Plasma Pharmacokinetic Study of a Novel Anti- Sichistosomiasis Agent P96 in Rat by Liquid Chromatography-tandem Mass Spectrometry

2019 ◽  
Vol 15 (4) ◽  
pp. 379-387
Author(s):  
Ran Meng ◽  
Danlu Zhang ◽  
Jianbo Ji ◽  
Lingyun Hu ◽  
Dequn Sun ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Rat Plasma ◽  
Drug Candidate ◽  
Tandem Mass ◽  
Limit Of Quantification ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Positive Mode

Background: 2-Cyclopentanecarbonyl-1,2,3,6,7,11b-hexahydro-pyrazino[2,1- a]isoquinolin- 4-one (P96), was found to be a novel drug candidate with one chiral center to treat schistosomiasis caused by Schistosoma japonicum. </P><P> Objective: To study pharmacokinetic characteristics, a simple, rapid and sensitive liquid chromatography- tandem mass spectrometry (LC-MS/MS) method was developed and fully validated for the quantification analysis of P96 in rat plasma. Methods: Chromatographic separation was performed on a C18 column with gradient eluted mobile phase composed of acetonitrile and water at a flow rate of 0.5 mL/min. Detection was performed on a triple-quadrupole tandem mass spectrometer using positive mode electrospray ionization in the multiple reactions monitoring (MRM) mode. Results: Excellent linearity was observed in the range of 3-900 ng/mL with the lower limit of quantification of 3 ng/mL in rat plasma for P96. The intra- and inter-day precisions exhibited less than 6.6%. Mean recoveries ranged from 96.9% to 102.4%. This method was applied to investigate the enantioselective differences on the pharmacokinetics between (R,S)-P96 and its enantiomers in rats after oral administration. The enantioselective differences of (R)-P96, (S)-P96 and (R,S)-P96 were found and compared. Conclusion: The established method was found to be accurate, precise, and sensitive and can be applied to investigate the stereoselective differences on pharmacokinetics between rac-P96 and its enantiomers.

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