The concentrations of targeted volatile organic compounds present in ethyl acetate extracts were quantified with external standards by liquid injection gas chromatography with triple-quad tandem mass spectrometry (LI-GC-TQ-MS/MS), using a Trace 1,300 gas chromatograph equipped with a Dbwax-etr column (Thermo Fisher Scientific) and coupled to a TSQ 8000 EVO triple quadrupole mass spectrometer (Interscience, Breda, Netherlands), as described previously (Díaz-Muñoz et al., 2021 (link)).
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