Synthesis of 2-arylbenzimidazoles under mild conditions catalyzed by a heteropolyacid-containing task-specific ionic liquid and catalyst investigation by electrospray (tandem) mass spectrometry

RSC Advances ◽  
2015 ◽  
Vol 5 (85) ◽  
pp. 69418-69422 ◽  
Author(s):  
Haline G. O. Alvim ◽  
Heibbe C. B. de Oliveira ◽  
Giovana A. Bataglion ◽  
Marcos N. Eberlin ◽  
Luciana M. Ramos ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquid ◽  
Tandem Mass Spectrometry ◽  
Condensation Reaction ◽  
Tandem Mass ◽  
Hydrogen Sulfate ◽  
Electrospray Tandem Mass Spectrometry ◽  
Mild Conditions ◽  
Brönsted Acid ◽  
Task Specific Ionic Liquid

A task-specific ionic liquid constituted by a Bronsted acid (1-(3-sulfopropyl)-3-methyl-imidazolium hydrogen sulfate), namely MSI, and by [PW12O40]3−, namely PW, was used for the condensation reaction in the synthesis of 2-arylbenzimidazoles.

Analysis of Brassinosteroids in Soybean Seeds and Leaves by Liquid Chromatography-Tandem Mass Spectrometry

2017 ◽  
Vol 10 (1) ◽  
pp. 100-109
Author(s):  
Hongxia Li ◽  
Natasha Trzaskalski ◽  
R.J. Neil Emery
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
High Performance ◽  
Soybean Seeds ◽  
Tandem Mass ◽  
Electrospray Tandem Mass Spectrometry ◽  
Aqueous Methanol ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

Objective:A simple and fast high performance liquid chromatography-electrospray tandem mass spectrometry (LC-ESI-MS/MS) method has been developed for the analysis of brassinosteroids (BRs) in plants without derivatization.Materials:The BRs (including castasterone, 24-epicastasterone, brassinolide and 24-epibrassinolide) have been extracted with ice cold 80% aqueous methanol solution.Method:Five different purification strategies have been tested for the purification and enrichment of BRs.Conclusion:This analytical method was sensitive, reliable, rapid and applicable to trace analysis in complex plant samples.

Determination of Mildronate in Human Plasma and Urine by UPLC–Positive Ion Electrospray Tandem Mass Spectrometry

2011 ◽  
Vol 73 (7-8) ◽  
pp. 659-665 ◽  
Author(s):  
Li-Jing Cai ◽  
Jun Zhang ◽  
Wen-Xing Peng ◽  
Rong-Hua Zhu ◽  
Jian Yang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Human Plasma ◽  
Tandem Mass ◽  
Electrospray Tandem Mass Spectrometry ◽  
Human Plasma And Urine ◽  
Positive Ion
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