Table 2.

Retention time, molecular weight and enthalpy of vaporization [31, 32].

Compound	Retention time (min)	Molecular weight (g/mol)	ΔH V   (KJ/mol)
γ-Butyrolactone	15.97	86.04	54.40 ± 0.40
γ-Hexalactone	17.09	114.14	57.20 ± 0.30
γ-Heptalactone (IS)	18.60	128.17	62.30 ± 0.30
Whiskey-lactone I (trans-whiskey-lactone)	19.73	156.22	48.36
γ-Octalactone	20.31	142.20	66.46 ± 0.40
Whiskey-lactone II (cis-whiskey-lactone)	20.74	156.22	48.36
γ-Nonalactone	21.67	156.22	70.30 ± 0.20
γ-Decalactone	23.14	170.25	75.60 ± 0.30
3,4-Dimethylphenol (IS)	23.86	122.16	85.70 ± 0.10***
δ-Decalactone	24.01	170.25	74.20 ± 0.25
γ-Undecalactone	24.73	184.28	79.51 ± 0.40

***Enthalpy of sublimation.