scholarly journals Supermolecule-assisted imaging of low-molecular-weight quaternary-ammonium compounds by MALDI-MS of their non-covalent complexes with cucurbit[7]uril

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 34261-34265
Author(s):  
Di Chen ◽  
Jun Han ◽  
Juncong Yang ◽  
David Schibli ◽  
Zhenzhong Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Compounds ◽  
Maldi Ms ◽  
Low Molecular Weight ◽  
Indirect Analysis ◽  
Ammonium Compounds

Cucurbit[7]uril was used to form non-covalent complexes with low-molecular-weight quaternary-ammonium compounds for their indirect analysis by MALDI-MS.

Determination of High Molecular Weight Quaternary Ammonium Compounds as Triiodides

1947 ◽  
Vol 19 (11) ◽  
pp. 885-888 ◽  
Author(s):  
O. B. Hager ◽  
E. M. Young ◽  
T. L. Flanagan ◽  
H. B. Walker
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Compounds ◽  
Ammonium Compounds

Determination of quaternary ammonium compounds in food products by the method of ultra-performance liquid chromatography/high resolution mass-spectrometry

2020 ◽  
Vol 86 (8) ◽  
pp. 23-31
Author(s):  
V. G. Amelin ◽  
D. S. Bolshakov
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Quaternary Ammonium ◽  
High Resolution Mass Spectrometry ◽  
Food Products ◽  
Quaternary Ammonium Compounds ◽  
High Resolution Mass ◽  
Ammonium Compounds ◽  
Resolution Mass

The goal of the study is developing a methodology for determination of the residual amounts of quaternary ammonium compounds (QAC) in food products by UHPLC/high-resolution mass spectrometry after water-acetonitrile extraction of the determined components from the analyzed samples. The identification and determination of QAC was carried out on an «UltiMate 3000» ultra-high-performance liquid chromatograph (Thermo Scientific, USA) equipped with a «maXis 4G» high-resolution quadrupole-time-of-flight mass spectrometric detector and an ion spray «ionBooster» source (Bruker Daltonics, Germany). Samples of milk, cheese (upper cortical layer), dumplings, pork, chicken skin and ground beef were used as working samples. Optimal conditions are specified for chromatographic separation of the mixture of five QAC, two of them being a mixture of homologues with a linear structure (including isomeric forms). The identification of QAC is carried out by the retention time, exact mass of the ions, and coincidence of the mSigma isotopic distribution. The limits for QAC detection are 0.1 – 0.5 ng/ml, the determination limits are 1 ng/ml for aqueous standard solutions. The determinable content of QAC in food products ranges within 1 – 100 ng/g. The results of analysis revealed the residual amount of QAC present in all samples, which confirms data of numerous sources of information about active use of QAC-based disinfectants in the meat and dairy industry. The correctness of the obtained results is verified by introduction of the additives in food products at a level of 10 ng/g for each QAC. The relative standard deviation of the analysis results does not exceed 0.18. The duration of the analysis is 30 – 40 min.

scholarly journals A study of the application of graphite MALDI to the analysis of short-chain polyethylene glycols

2021 ◽  
Author(s):  
Ulric Conway ◽  
Alexander D. Warren ◽  
Christopher J. Arthur ◽  
Paul J. Gates
Keyword(s):  
Molecular Weight ◽  
Lithium Chloride ◽  
Maldi Ms ◽  
Short Chain ◽  
Polyethylene Glycols ◽  
Low Molecular Weight ◽  
Colloidal Graphite ◽  
Graphite Matrix ◽  
Successful Analysis

MALDI-MS using colloidal graphite matrix doped with lithium chloride for the successful analysis of low molecular weight polymers.

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