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Keywords:

  • Headspace analysis;
  • solid-phase microextraction;
  • aroma analysis;
  • maté tea;
  • Ilex paraguariensis HS-SPME

Abstract

Volatile and semi-volatile components of maté (Ilex paraguariensis St. Hil.) were analysed by headspace solid-phase microextraction (HS-SPME) coupled to gas chromatography and mass spectrometry. Five SPME fibres coated separately with 100 µm poly(dimethylsiloxane) (PDMS), 65 µm PDMS–divinylbenzene (DVB), 70 µm carbowax (CW)–DVB, 85 µm carboxen (CAR)–PMDS or 50/30 µm DVB–CAR, were tested. Seventy compounds were identified in the sample headspace, including propanal, (E)-2-pentenal, hexanal, (E)-2-hexenal, 6-methyl-5-hepten-2-one, (E,Z)-2,4-heptadienal, (E,E)-2,4-heptadienal, (E,Z)-3,5-octadien-2-one, β-cyclocitral, 3-ethyl 4-methyl-(1H)-pyrrole-2,5-dione, α-ionone, geranylacetone, β-ionone, dihydroactinidiolide and caffeine. Extraction parameters such as temperature, time and sample mass were studied and optimized. The best conditions for trapping volatile and semi-volatile compounds were obtained using a DVB–CAR fibre at 80°C for 60 min with a sample mass starting from 100 mg in a vial of 4 mL. Copyright © 2007 John Wiley & Sons, Ltd.