Direct Insertion Probe Mass Spectrometry of Polymers

2011 ◽  
pp. 69-103 ◽  
Author(s):  
Jale Hacaloglu
Keyword(s):  
Mass Spectrometry ◽  
Direct Insertion Probe

Thermal and structural characterization of polypyrrole by direct-insertion probe pyrolysis mass spectrometry

2001 ◽  
Vol 119 (1-3) ◽  
pp. 307-308 ◽  
Author(s):  
T. Uyar ◽  
L. Toppare ◽  
J. Hacaloğlu
Keyword(s):  
Mass Spectrometry ◽  
Structural Characterization ◽  
Pyrolysis Mass Spectrometry ◽  
Direct Insertion Probe

Analysis of Illegally Distributed Anabolic Steroid Products by Liquid Chromatography with Identity Confirmation by Mass Spectrometry or Infrared Spectrophotometry

1990 ◽  
Vol 73 (6) ◽  
pp. 904-926 ◽  
Author(s):  
Milda J Walters ◽  
Russell J Ayers, ◽  
Daniel J Brown
Keyword(s):  
Mass Spectrometry ◽  
Anabolic Steroid ◽  
Infrared Spectrophotometry ◽  
Uv Detector ◽  
Tentative Identification ◽  
Analytical Scheme ◽  
Mobile Phases ◽  
Phase Liquid ◽  
Liquid Chromatographic ◽  
Direct Insertion Probe

Abstract Anabolic steroid products found in the Illegal market are primarily oil-based Injectables or tablets and often do not contain the Ingredients declared on the label. An analytical scheme based on a reverse-phase liquid chromatographic (LC) system for screening, tentative Identification, and quantitation Is presented. Methanolic sample extracts are chromatographed on an octadecyl column using 2 mobile phases (methanol and (75+25) methanol-water) and tracked at 3 wavelengths (240, 210, and 280 nm) or with a photodlode array UV detector. Retention time ratios (RR) relative to testosterone and UV data are used for tentative Identification. The same LC system serves as a cleanup and Isolation step for Identity confirmation by direct Insertion probe mass spectrometry (MS) or Fourier transform Infrared spectrophotometry (FTIR). Recoveries range from 96.2 to 100.2% for 11 different steroids extracted from sesame oil. LC RR values for over 40 steroids, analytical results for typical products, and MS and FTIR spectra for selected compounds are presented.

Volatile organic compounds analyzed by direct insertion probe mass spectrometry

2011 ◽  
Vol 89 (12) ◽  
pp. 1539-1541 ◽  
Author(s):  
Jian Jun Li
Keyword(s):  
Mass Spectrometry ◽  
Volatile Organic Compounds ◽  
Aluminum Oxide ◽  
Organic Compounds ◽  
Capillary Tube ◽  
High Vacuum ◽  
Boiling Points ◽  
Volatile Organic ◽  
Evaporative Loss ◽  
Direct Insertion Probe

A modified approach for analyzing volatile organic compounds through standard direct insertion probe mass spectrometry is presented. With aluminum oxide or silica powder packed in a capillary tube, the sample’s evaporative loss in a high vacuum instrument chamber is significantly reduced and the retention time is increased accordingly. With this technique, organic compounds with lower boiling points (e.g., 2-butanol at 99 °C) can be readily detected and analyzed.

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