Table 4.

Effect of aging time in the alcohols, carboxylic acids, nitrogen compounds, and sulphur compounds content, expressed as quantifier area units (AU × 10³/g), of donkey meat steaks aged for 14 days under vacuum conditions (n = 10 samples for each aging time).

			Ageing Time (Days)
Volatile Compound	m/z	LRI	1	3	6	9	14	SEM	p-Value
Cyclobutanol	44	504	143.69	169.85	147.22	138.39	143.89	4.76	0.957
1-Pentanol	55	847	2755.10	2733.92	1463.86	2160.24	1930.46	3.98	0.547
1-Hexanol	56	959	2130.13	2067.04	2218.5	1341.74	2341.82	1.12	0.729
1-Heptanol	70	1046	365.67	248.69	59.14	116.04	92.70	680.64	0.160
1-Octen-3-ol	57	1051	1418.47	1662.70	814.05	1001.59	1393.13	14.12	0.121
n-Tridecan-1-ol	55	1073	182.45	247.07	242.18	225.81	244.91	274.05	0.771
1-Heptanol, 2,4-diethyl-	69	1085	133.83	129.36	230.15	146.55	137.41	2488.83	0.601
1-Decanol	70	1027	21.60	25.42	34.15	26.52	20.61	42.70	0.488
1-Tetradecanol	68	1225	25.66	28.03	33.32	28.62	22.28	118.82	0.764
1-Decanol, 2-hexyl-	97	1241	21.03	22.45	28.21	24.67	16.65	16.25	0.491
1-Butanol, 2-methyl-	57	1243	18.14	16.15	19.77	17.15	17.39	22.01	0.943
Total Alcohols			7655.53	6345.87	3301.09	5243.44	4372.90	822.52	0.237
Butanoic acid	60	918	45.42	70.17	57.60	83.42	106.55	1.994	0.336
Hexanoic acid	60	1088	73.60	83.20	70.53	49.83	102.80	1.357	0.172
Formica cid, octyl ester	56	1133	47.48	110.11	92.78	122.76	108.28	1.44	0.282
Total Carboxylic Acids			169.82 a	217.63 a,b	208.69 ab	219.33 a,b	317.62 b	2797.109	0.003
Diazene, dimethyl-	15	532	213.87	202.38	140.06	237.28	245.35	9.366	0.487
Pyrazine, methyl-	94	893	79.65 a	57.10 a	100.68 a	163.72 b	165.78 b	6.782	0.019
2-Propen-1-amine	56	916	46.69	105.47	137.19	78.33	59.53	10.758	0.523
Pyrazine, 2,5-dimethyl-	42	982	223.78 a	168.44 a	277.77 a	475.65 b	668.82 b	14.637	0.009
Pyrazine, trimethyl-	122	1064	128.90 a	93.50 a	154.74 a	277.12 b	293.64 b	19.326	<0.001
Total Nitrogen Compound			606.07 a	626.90 a	810.43 a	1232.10 b	1633.13 b	11.795	0.004
Dimethylsulfide	62	534	26.63	21.63	15.03	24.71	17.47	17.208	0.558
Carbondisulfide	76	533	119.65	117.40	94.24	132.27	133.34	33.188	0.540
Total Sulfur Compound			136.65	146.63	123.96	144.38	157.85	16.872	0.761

Different letters in the same line show statistical differences (^a,b: p < 0.01). SEM: standard error of mean; m/z: Quantifier ion; LRI: Lineal Retention Index calculated for DB-624 capillary column (J&W scientific: 30 m × 0.25 mm id, 1.4 µm film thickness) installed on a gas chromatograph equipped with a mass selective detector. LRI: linear retention index in agreement with literature for the same chromatographic column [25,34,43].