Geranyl acetone

Hexanal (≥99%), (E)-2-hexenal (98.0%), benzaldehyde (>99%), 1-octen-3-ol (98%), 2-pentyl-furan (98%), D-limonene (≥99%), benzeneacetaldehyde (95%), linalool (98%), L-borneol (98%), epoxylinalol (>98%), methyl salicylate (≥99 %), β-cyclocitral (95%), (3Z)-3-hexenyl 2-methylbutanoate (98%), 1-methyl-naphthalene (98%), geranic acid (90%), n-hexyl caproate (≥98%), dihydroactinidiolide (98%), and (E)-nerolidol (95%) were purchased from Macklin (Shanghai, China). linalool oxide I (99%), linalool oxide II (96%), caryophyllene (90%), geranyl acetone (99%), and n-alkanes solution (C₈-C₃₂) were purchased from J&K Chemical (Beijing, China). Hexanoic acid (≥99.5%), phenylethyl alcohol (≥99%), α-terpineol (>95%), (Z)-geraniol (>98%), (E)-geraniol (≥99%), (E)-2-decenal (95%), α-ionone (≥90%), β-ionone (97%) and butylated hydroxytoluene (>99.7%) were purchased from Aladdin (Shanghai, China). Safranal (90%), theaspirane (≥95%), (E)-β-damascenone (≥95%), and dihydro-β-ionone (≥90%) were purchased from Bidepharm (Shanghai, China). Sodium chloride (99.5%, analytical grade). Water used in this study was purified by Milli-Q purification system (Millipore, Bedford, MA, USA).

2,6-dimethylpyrazine, nonanal, (E)-2-octenal, 2,3-dimethylpyrazine, 3-ethyl-2-methylpyrazine, 2,3,5-trimethylpyrazine, 2-ethyl-3,5-dimethylpyrazine, benzaldehyde, (E)-2-nonanal, β-caryophyllene, γ-butyrolactone, phenylacetaldehyde, furfuryl alcohol, 2,4-decadienal, geranyl acetone, guaiacol, 4-ethyl-2-methoxyphenol, γ-nonanolactone, 2-methoxy-4-vinylphenol, hexanal, 2-phenyl-2-butenal (all of them are chromatographic purity with at least 97% purity, J&K Scientific Ltd.). A C7−C30 n-alkane mixture was purchased from J&K Scientific Ltd., Beijing, China. The internal standard 2-octanol (chromatographic purity with 98.0% purity), anhydrous ethanol (chromatography grade), and sodium chloride (analytical purity) were purchased from China National Pharmaceutical Group Corp. (Shanghai, China). High purity helium (99.999%) was purchased from Beijing Yanglilai Chemical Gas Co., Ltd. (Beijing, China).