Table 2. VOCs identified in donkey meat by HS–GC–IMS

Count	Compound	Category	CAS#	Formula	MW	RI	Rt/s	Dt/ms	Comment
1	Nonanal	Aldehydes	C124196	C9H18O	142.2	1,105.6	502.978	1.48428
2	Octanal	Aldehydes	C124130	C8H16O	128.2	1,005.8	354.803	1.41251
3	Heptanal	Aldehydes	C111717	C7H14O	114.2	898.3	262.121	1.34213	Monomer
4	Hexanal	Aldehydes	C66251	C6H12O	100.2	792.1	204.268	1.27312	Monomer
5	Hexanal-D	Aldehydes	C66251	C6H12O	100.2	788.7	202.649	1.55761	Dimer
6	Methyl isobutyl ketone	Ketones	C108101	C6H12O	100.2	727.7	175.835	1.17469	Monomer
7	3-Hydroxybutan-2-one	Ketones	C513860	C4H8O2	88.1	710.0	168.727	1.07193	Monomer
8	2-Pentanone	Ketones	C107879	C5H10O	86.1	683.2	158.874	1.12061	Monomer
9	2-Pentanone-D	Ketones	C107879	C5H10O	86.1	682.7	158.713	1.36939	Dimer
10	2-Hexanone	Ketones	C591786	C6H12O	100.2	778.6	197.964	1.18875
11	3-Hydroxybutan-2-one-D	Ketones	C513860	C4H8O2	88.1	710.0	168.727	1.32937	Dimer
12	Benzaldehyde	Aldehydes	C100527	C7H6O	106.1	960.6	311.121	1.15045
13	2-Heptanone	Ketones	C110430	C7H14O	114.2	886.0	254.071	1.26139
14	Pentan-1-ol	Alcohols	C71410	C5H12O	88.1	759.6	189.382	1.25449	Monomer
15	Unidentified 1	Unidentifieds	-	-	-	650.8	149.312	1.11744
16	Oct-1-en-3-ol	Alcohols	C3391864	C8H16O	128.2	983.2	331.172	1.15854
17	3-Pentanol	Alcohols	C584021	C5H12O	88.1	691.4	161.591	1.20205
18	Unidentified 2	Unidentifieds	-	-	-	767.8	193.044	1.47531
19	Unidentified 3	Unidentifieds	-	-	-	724.7	174.613	1.4017
20	2-Octanol	Alcohols	C123966	C8H18O	130.2	987.4	335.015	1.43633
21	Unidentified 4	Unidentifieds	-	-	-	758.0	188.677	1.40605
22	Pentanal	Alcohols	C110623	C5H10O	86.1	689.1	160.717	1.42126
23	3-Methylbutanal-D	Aldehydes	C590863	C5H10O	86.1	648.2	148.573	1.40308	Dimer
24	Unidentified 5	Unidentifieds	-	-	-	683.9	159.079	1.39323
25	3-Methylbutanal	Aldehydes	C590863	C5H10O	86.1	642.6	146.988	1.18936	Monomer
26	Pentan-1-ol-D	Alcohols	C71410	C5H12O	88.1	758.7	189.013	1.51542	Dimer
27	Heptanal-D	Aldehydes	C111717	C7H14O	114.2	896.0	260.471	1.69323	Dimer
28	Unidentified 6	Unidentifieds	-	-	-	722.2	173.588	1.43839
29	Methyl isobutyl ketone-D	Ketones	C108101	C6H12O	100.2	725.2	174.796	1.48144	Dimer
30	2-Methyl-1-propanol	Alcohols	C78831	C4H10O	74.1	620.1	140.782	1.17277
31	Ethyl Acetate	Esters	C141786	C4H8O2	88.1	601.1	135.745	1.09362
32	2-Butanone	Ketones	C78933	C4H8O	72.1	579.2	130.193	1.06013	Monomer
33	2-Butanone-D	Ketones	C78933	C4H8O	72.1	578.5	130.021	1.24355	Dimer
34	Unidentified 7	Unidentifieds	-	-	-	542.1	121.264	1.1233
35	Unidentified 8	Unidentifieds	-	-	-	488.8	109.494	1.17888
36	Isopropyl alcohol	Alcohols	C67630	C3H8O	60.1	491.4	110.034	1.09142	Monomer
37	Acetone	Ketones	C67641	C3H6O	58.1	486.2	108.954	1.11527
38	Isopropyl alcohol-D	Alcohols	C67630	C3H8O	60.1	487.9	109.314	1.22747	Dimer
39	Unidentified 9	Unidentifieds	-	-	-	558.6	125.151	1.30434
40	1-Butanol	Alcohols	C71363	C4H10O	74.1	662.4	152.685	1.18153

VOCs, volatile organic compounds; HS–GC–IMS, headspace–gas chromatography–ion mobility spectrometry; MW, molecular weight; RI, retention index; Rt, retention time; Dt, drift time.