Comparison of MTBSTFA and BSTFA in derivatization reactions of polar compounds prior to GC/MS analysis

Claude Schummer*, Olivier Delhomme, Brice M.R. Appenzeller, Robert Wennig, Maurice Millet

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

239 Citations (Scopus)

Abstract

In this study, MTBSTFA and BSTFA, which are among the preferred derivatization reagents for silylation were both tested on derivatization of six different groups of polar chemicals to get information about usefulness in terms of sensitivity and specificity of both reagents. Tested compound groups were nitrophenols and methoxyphenols, sterols and sugars, dicarboxylic acids and hydroxylated polycyclic aromatic hydrocarbons. It was found that MTBSTFA-derivates produce characteristic fragmentation patterns presenting mainly the fragments [M]+, [M-57]+ and [M-131]+, of which [M-57]+ is generally dominant on the mass spectrogram. BSTFA-derivates mainly show the fragments [M]+, [M-15]+ and [M-89]+ whereof the molecular ion [M]+ is generally dominant. It was also found that steric hindrance and molecular mass play a very important role in the choice of the best suited derivatization reagent: compounds with sterically hindered sites derivatized with MTBSTFA produce very small analytical responses or no signal at all, and compounds with high molecular mass produce no characteristic fragmentation pattern when derivatization is performed with BSTFA. It was also found that MTBSTFA-derivatization facilitates separation of isomer analytes, suggesting its choice in combination to semi-polar columns, whilst BSTFA seems better for sterically hindered compounds. Findings were confirmed with applications of both reagents to biological and environmental matrices (urine and atmospheric aerosols).

Original languageEnglish
Pages (from-to)1473-1482
Number of pages10
JournalTalanta
Volume77
Issue number4
DOIs
Publication statusPublished - 15 Feb 2009

Keywords

  • BSTFA
  • Derivatization
  • MTBSTFA
  • Silylation

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