title: Studies on the aroma of maté (Ilex paraguariensis St. Hil.) using headspace solid-phase microextraction.
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 microm poly(dimethylsiloxane) (PDMS), 65 microm PDMS-divinylbenzene (DVB), 70 microm carbowax (CW)-DVB, 85 microm carboxen (CAR)-PMDS or 50/30 microm 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, beta-cyclocitral, 3-ethyl 4-methyl-(1H)-pyrrole-2,5-dione, alpha-ionone, geranylacetone, beta-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 degrees C for 60 min with a sample mass starting from 100 mg in a vial of 4 mL.
authors.affiliation: Centro Federal de Educação Tecnológica de Química (CEFET Química), Unidade Rio de Janeiro, Rua Senador Furtado, 121 Maracana, CEP 20270-021, Rio de Janeiro, RJ, Brasil. hiramar@uol.com.br
authors.forename: Hiram Costa
authors.initials: HC
authors.lastname: Araújo
authors.forename: Maria Elisa Gonçalves
authors.initials: ME
authors.lastname: Lacerda
authors.forename: Daíse
authors.initials: D
authors.lastname: Lopes
authors.forename: Humberto Ribeiro
authors.initials: HR
authors.lastname: Bizzo
authors.forename: Maria Auxiliadora Coelho
authors.initials: MA
authors.lastname: Kaplan
mesh_terms: D001628:Beverages / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D005740:Gases / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification*; D030019:Ilex paraguariensis / Q000737:chemistry*; D009812:Odorants / Q000032:analysis*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014835:Volatilization
chemical_list: D005740:Gases