Selective Purge-and-Trap Method for the Analysis of Volatile Pyrazines

May chien Kuo, Yuangang Zhang, Thomas G. Hartman, Robert T. Rosen, Chi tang Ho

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A simple and selective purge-and-trap method for isolation, concentration, and fractionation of volatile pyrazines from a matrix with complex volatiles was developed. A dilute HC1 aqueous solution was used to selectively trap pyrazines from total headspace components from a model system generated product and potato chips. After being titrated to pH 13, the acid-trapped pyrazines were then recovered by the headspace technique and analyzed by GC and GC-MS. Not only can the method quantify minor or trace pyrazines from a very small amount of sample with complex volatiles but also it is much less laborious and time-consuming compared with other traditional isolation, fractionation methods.

Original languageEnglish (US)
Pages (from-to)1020-1022
Number of pages3
JournalJournal of agricultural and food chemistry
Issue number4
StatePublished - Jul 1 1989

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)


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