High-resolution Orbitrap mass spectrometry for the analysis of carotenoids in tomato fruit: validation and comparative evaluation towards UV-VIS and tandem mass spectrometry

Anal Bioanal Chem. 2014 Apr;406(11):2613-26. doi: 10.1007/s00216-014-7654-6. Epub 2014 Feb 20.

Abstract

In this study, a generic extraction protocol and full-scan high-resolution Orbitrap-mass spectrometry (MS) detection method were developed, enabling the metabolomic screening for carotenoids in tomato fruit tissue. To this end, the carotenoids lutein, zeaxanthin, α-carotene, β-carotene, and lycopene (representing both xanthofylls and carotenes) were considered. The extraction procedure was optimized by means of a D-optimal design and consisted of a liquid-liquid extraction with methanol/tert-butyl methyl ether (1:1, v/v). The considered compounds were detected by a single-stage Exactive(TM) mass spectrometer, operating at a mass resolution of 100,000 full width at half maximum. The validation study demonstrated excellent performance in terms of linearity (R (2) > 0.99), repeatability (CV ≤ 10.6 %), within-laboratory reproducibility (CV ≤ 12.2 %), and mean corrected recovery (ranging from 85 to 106 %). Additionally, a comparative evaluation towards well-established detection techniques, i.e., tandem mass spectrometry (MS/MS) and ultraviolet-visible spectroscopy (UV-VIS) photodiode array, indicated superior performance of high-resolution Orbitrap-MS with regard to specificity/selectivity and sensitivity (with limits of detection ranging from 1.0 to 3.8 pg μL(-1)). As a result, it may be concluded that high-resolution Orbitrap-MS is a suited alternative for UV-VIS or MS/MS in analyzing carotenoids and may offer significant value in carotenoid research because of the metabolomic screening possibilities.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Carotenoids / chemistry*
  • Fruit / chemistry
  • Plant Extracts / chemistry*
  • Solanum lycopersicum / chemistry*
  • Spectrophotometry / methods*
  • Spectrophotometry, Ultraviolet / methods
  • Tandem Mass Spectrometry / instrumentation
  • Tandem Mass Spectrometry / methods*

Substances

  • Plant Extracts
  • Carotenoids