Heptan 2 one

Dichloromethane, ethyl acetate, absolute ethanol (99%), and anhydrous sodium sulfate were purchased from VWR International (Leuven, Belgium). Standards of ethyl benzoate, methyl anthranilate, phenylacetaldehyde, 2-methylbutanal, 3-methylbutanal, heptan-2-one, heptan-2-ol, 2-methylbutyl acetate, trans-2-nonenal, methional, isobutyl acetate, benzaldehyde, myrcene, linalool, ethyl heptanoate, ethyl octanoate, 2-phenylethyl acetate, ethyl acetate, ethyl butanoate, isoamyl propionate, acetophenone, and 2-acetylthiophene were purchased from Sigma-Aldrich (Bornem, Belgium). Standard of nonan-2-one was purchased from Janssen Chimica (Geel, Belgium). Standards of dimethyltrisulfide and 1-octen-3-ol were purchased from Acros Organics (Geel, Belgium). Standard of 3-methylbutan-1-ol was purchased from Merck Millipore (Burlington, NJ, USA). Standard of acetoin was purchased from Supelco (Bellefonte, PA, USA).

Chemical standards of acetone, butane-2,3-dione, butan-2-one, thiophene, dimethyl disulfide, hexanal, heptan-4-one, heptan-2-one, 2-pentylfuran, dimethyl trisulfide, 6-methylhept-5-en-2-one, benzaldehyde, octanal, d-limonene, trans-3-octen-2-one, linalool, 4-methylphenol, 1,3-di-tert-butylbenzene, internal standard (4-methylpentan-2-ol), and sodium chloride (NaCl, ≥99.5%) were supplied by Sigma-Aldrich (Saint Louis, MO, USA). MilliQ water (Millipore, Bedford, MO, USA) was used for the preparation of standards. Hydrochloric acid (HCl, 37%) was purchased from Chempur (Piekary Śląskie, Poland). The 75-μm carboxen/polydimethylsiloxane (CAR/PDMS) (stable flex) solid-phase microextraction (SPME) fibers were purchased from Supelco (Bellefonte, PA, USA).