Trans 3 octen 2 one

Standards of all analyzed compounds: 2,3-butanedione, 2-butanone, thiophene, dimethyl disulfide, hexanal, 4-heptanone, 2-heptanone, 2-pentylfuran, dimethyl trisulfide, 6-methyl-5-hepten-2-one, benzaldehyde, octanal, trans-3-octen-2-one, p-cresol and 1,3-di-tert-butylbenzene, internal standard: 4-methyl-2-phenol and saturated alkanes (C₇–C₄₀) were supplied by Sigma-Aldrich (Saint Louis, USA). Retention indexes for selected compounds were calculated according to Zellner and co-authors.^{23 (link)} MilliQ water (Millipore, Bedford, USA) was used for the preparation of standards. Sodium chloride (NaCl, ≥99.5%) was purchased from Sigma-Aldrich (Saint Louis, USA), sodium hydroxide (NaOH, 99%) from POCH (Gliwice, Poland) and hydrochloric acid (HCl, 37%) was purchased from Chempur (Piekary Śląskie, Poland). The SPME fibers used in the experiments were: 50/30 μm divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) (stable flex), 65 μm polydimethylsiloxane/divinylbenzene (PDMS/DVB) (stable flex), 7 μm polydimethylsiloxane (PDMS7), 100 μm polydimethylsiloxane (PDMS100), 75 μm carboxen/polydimethylsiloxane (CAR/PDMS) (stable flex), 85 μm polyacrylate (PA) (stable flex) and 60 μm carbowax-polyethylene glycol (PEG), purchased from Supelco (Bellefonte, PA, USA).