Bulk and compound-specific stable isotope ratio analysis for authenticity testing of organically grown tomatoes

Research output: Contribution to journalJournal article

  • Luana Bontempo
  • Katryna A. van Leeuwen
  • Mauro Paolini
  • Laursen, Kristian Holst
  • Cristina Micheloni
  • Paul D. Prenzler
  • Danielle Ryan
  • Federica Camin

Until now, there has been a lack of analytical methods that can reliably verify the authenticity of organically grown plants and derived organic food products. In this study, stable isotope ratio analysis of hydrogen (H, δ2H), carbon (C, δ13C), nitrogen (N, δ15N), oxygen (O, δ18O) and sulfur (S, δ34S) was conducted along the tomato passata production process using organic and conventionally grown tomatoes from two Italian regions over two years. A gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) based method was developed and applied for analysis of C and N isotope ratios in amino acids derived from tomatoes. Of the bulk isotope ratios, δ15N was the most significant parameter for discriminating organic from conventional products. The classification power was improved significantly by compound-specific isotope analysis regardless of the production years and regions. We conclude that isotope analysis of amino acids is a novel analytical tool for complementing existing certification and control procedures in the organic tomato sector.

Original languageEnglish
Article number126426
JournalFood Chemistry
Volume318
Number of pages11
ISSN0308-8146
DOIs
Publication statusPublished - 2020

    Research areas

  • Amino acids, Compound-specific, Organic, Stable isotope ratios, Tomatoes

ID: 238678103