True ion pick (TIPick): A denoising and peak picking algorithm to extract ion signals from liquid chromatography/mass spectrometry data

Tsung Jung Ho, Ching Hua Kuo, San Yuan Wang, Guan Yuan Chen, Yufeng J. Tseng

Research output: Contribution to journalArticle

20 Citations (Scopus)


Liquid Chromatography - Time of Flight Mass Spectrometry has become an important technique for toxicological screening and metabolomics. We describe TIPick a novel algorithm that accurately and sensitively detects target compounds in biological samples. TIPick comprises two main steps: background subtraction and peak picking. By subtracting a blank chromatogram, TIPick eliminates chemical signals of blank injections and reduces false positive results. TIPick detects peaks by calculating the S(CCINI) values of extracted ion chromatograms (EICs) without considering peak shapes, and it is able to detect tailing and fronting peaks. TIPick also uses duplicate injections to enhance the signals of the peaks and thus improve the peak detection power. Commonly seen split peaks caused by either saturation of the mass spectrometer detector or a mathematical background subtraction algorithm can be resolved by adjusting the mass error tolerance of the EICs and by comparing the EICs before and after background subtraction. The performance of TIPick was tested in a data set containing 297 standard mixtures; the recall, precision and F-score were 0.99, 0.97 and 0.98, respectively. TIPick was successfully used to construct and analyze the NTU MetaCore metabolomics chemical standards library, and it was applied for toxicological screening and metabolomics studies.

Original languageEnglish
Pages (from-to)234-242
Number of pages9
JournalJournal of Mass Spectrometry
Issue number2
Publication statusPublished - Feb 1 2013
Externally publishedYes



  • algorithm
  • chemometrics
  • Liquid Chromatography - Time of Flight Mass Spectrometry
  • metabolomics
  • toxicological screening

ASJC Scopus subject areas

  • Spectroscopy

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