Numerical Simulation Of Collision-Induced Dissociation Of Large Molecular Ions In Mass-Selective Detector With Atmospheric Pressure Chemical Ionization

2005 ◽  
Author(s):  
A. S. Kudryavtsev
Keyword(s):  
Numerical Simulation ◽  
Atmospheric Pressure ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Molecular Ions ◽  
Collision Induced Dissociation ◽  
Mass Selective Detector ◽  
Selective Detector ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical

scholarly journals An Organic Chemist’s Guide to Electrospray Mass Spectrometric Structure Elucidation

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 611 ◽  
Author(s):  
Arnold Steckel ◽  
Gitta Schlosser
Keyword(s):  
Atmospheric Pressure ◽  
Structure Elucidation ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Collision Induced Dissociation ◽  
Tandem Mass ◽  
Tandem Mass Spectra ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical

Tandem mass spectrometry is an important tool for structure elucidation of natural and synthetic organic products. Fragmentation of odd electron ions (OE+) generated by electron ionization (EI) was extensively studied in the last few decades, however there are only a few systematic reviews available concerning the fragmentation of even-electron ions (EE+/EE−) produced by the currently most common ionization techniques, electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI). This review summarizes the most important features of tandem mass spectra generated by collision-induced dissociation fragmentation and presents didactic examples for the unexperienced users.

Brown Carbon Sources in Singapore Identified by Factor Analysis of Atmospheric Pressure Chemical Ionization Mass Spectra

2021 ◽  
Author(s):  
LiuDongQing Yang ◽  
Xianfeng Wang ◽  
Mikinori Kuwata Kuwata
Keyword(s):  
Atmospheric Pressure ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Molecular Ions ◽  
Water Soluble ◽  
Ionization Mass ◽  
Combustion Source ◽  
Brown Carbon ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical

<p>Brown carbon (BrC) is an important candidate for the direct radiative effects of aerosol particles. It has been demonstrated that positive matrix factorization (PMF) is useful in analyzing Aerosol Mass Spectrometer (AMS) data for BrC source apportionment. However, fragmentation of molecular ions in AMS has been limiting its capability to categorize BrC sources. Soft-ionization mass spectrometric techniques are known to retain molecular information of chemical species. In this study, we applied atmospheric pressure chemical ionization mass spectrometry (APCI-MS) to identify the sources of water-soluble BrC. PM2.5 filter samples were collected at a site in Singapore during March-May of 2019. The extracted water-soluble organic matter (WSOM) was analyzed using APCI-MS, time-of-flight aerosol chemical speciation monitor (ToF-ACSM) and ultraviolet-visible spectrophotometer (UV-Vis). Five factor components were obtained by PMF analysis of the APCI-MS data. The PMF output and UV-Vis data were subsequently used to estimate the absorption Ångstrom exponents (AAE) of WSOM in each component. The estimated values of AAE ranged from 3.95 to 8.71. When comparing the factor contributions with simultaneously monitored gas and aerosol data, we found that the factor with the lowest value of AAE was likely emitted from a methane-rich combustion source, located east of the observation site. </p>

scholarly journals Application of High-Performance Liquid Chromatography for Simultaneous Identification of Integristerone A, 20-Hydroxyecdysone, Ecdysone and 2-Deoxy-20-hydroxyecdysone

2007 ◽  
Vol 2 (11) ◽  
pp. 1934578X0700201 ◽  
Author(s):  
Viatcheslav Rybin ◽  
Eugene Boltenkov ◽  
Elena Novozhilova
Keyword(s):  
Atmospheric Pressure ◽  
High Performance ◽  
Chemical Ionization ◽  
Atmospheric Pressure Chemical Ionization ◽  
Reversed Phase ◽  
Molecular Ions ◽  
Selective Detection ◽  
Pressure Chemical Ionization ◽  
Pressure Chemical ◽  
Simultaneous Identification

Conditions for separation and identification of integristerone A (1), 20-hydroxyecdysone (2), ecdysone (3) and 2-deoxy-20-hydroxyecdysone (4) by reversed-phase HPLC with UV and mass-selective detection at atmospheric pressure chemical ionization have been developed. Correlation between quasi-molecular ions fragmentation and structure peculiarities of the studied ecdysteroids has been shown. Application of these conditions for the analysis of extract from the inflorescences of Serratula komarovii made it possible to reveal and to identify compounds 1, 2 and 4.

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