Table 7. Concentration (µg/g) of aroma volatile compounds of WHD meat by feeding diets

Compounds	Retention time (min)	Loin		Belly		IM1)
		CD2)	ED	CD	ED
Aldehydes
2-Methyl pentanal	1.611	0.013 ± 0.005	0.010 ± 0.005	0.031 ± 0.003	0.043 ± 0.002	MS + STD
2-Methyl propanal	1.867	0.004 ± 0.000	0.003 ± 0.000	0.003 ± 0.000	0.003 ± 0.000	MS + STD
Butanal	1.994	0.001 ± 0.000	ND	0.002 ± 0.000	0.002 ± 0.000	MS + STD
3-Methyl butanal	2.435	0.009 ± 0.000	0.007 ± 0.000	0.005 ± 0.000	0.010 ± 0.002	MS + STD
2-Methyl butanal	2.610	0.010 ± 0.001	0.007 ± 0.000	0.004 ± 0.000	0.007 ± 0.000	MS + STD
Petanal	3.036	0.041 ± 0.004	0.018 ± 0.001	0.180 ± 0.012	0.199 ± 0.093	MS + STD
Hexanal	5.654	0.673 ± 0.093a	0.127 ± 0.012b	2.381 ± 0.231	2.745 ± 0.265	MS + STD
Heptanal	8.808	0.043 ± 0.005a	0.017 ± 0.009b	0.112 ± 0.002	0.118 ± 0.004	MS + STD
E,2-Heptenal	10.291	0.002 ± 0.000a	0.0001 ± 0.000b	0.016 ± 0.003	0.017 ± 0.001	MS + STD
Benzaldehyde	10.375	0.014 ± 0.006	0.013 ± 0.001	0.035 ± 0.003b	0.052 ± 0.001a	MS + STD
E,E-2,4-Decadienal	11.136	0.024 ± 0.003a	0.007 ± 0.000b	0.077 ± 0.007	0.099 ± 0.004	MS + STD
Benzeneacetaldehyde	12.405	0.002 ± 0.000	0.003 ± 0.000	0.003 ± 0.000	0.003 ± 0.000	MS + STD
E,2-Octenal	12.728	0.002 ± 0.000	0.001 ± 0.000	0.012 ± 0.009	0.014 ± 0.008	MS + STD
Nonanal	13.712	0.038 ± 0.003	0.022 ± 0.009	0.078 ± 0.004	0.085 ± 0.003	MS + STD
E,2-Nonenal	14.834	0.003 ± 0.000	0.004 ± 0.000	0.005 ± 0.000	0.007 ± 0.000	MS + STD
Decanal	15.720	0.002 ± 0.000	0.002 ± 0.000	0.001 ± 0.000	0.001 ± 0.000	MS + STD
E,E-2,4-Nonadienal	15.872	0.001 ± 0.000	0.001 ± 0.000	ND	ND	MS + STD
E,2-Dodecenal	16.757	0.001 ± 0.000	0.001 ± 0.000	0.004 ± 0.000	0.004 ± 0.000	MS + STD
2-Undecenal	18.527	0.001 ± 0.000	0.001 ± 0.000	0.002 ± 0.001	0.002 ± 0.000	MS + STD
Total aldehydes		0.882 ± 0.086a	0.242 ± 0.001b	2.944 ± 0.139	3.409 ± 0.149
Alcohols
1-Penten-3-ol	2.839	0.001 ± 0.000	0.003 ± 0.000	0.006 ± 0.000	0.003 ± 0.001	MS + STD
1-Pentanol	4.601	0.026 ± 0.005a	0.005 ± 0.001b	0.140 ± 0.005	0.130 ± 0.004	MS + STD
1-Hexanol	7.905	0.006 ± 0.000	0.003 ± 0.000	0.048 ± 0.008	0.014 ± 0.006	MS + STD
1-Hexen-3-ol	8.083	ND	0.001 ± 0.000	0.003 ± 0.000	0.003 ± 0.000	MS + STD
1-Heptanol	10.668	0.008 ± 0.000a	0.003 ± 0.000b	0.018 ± 0.001	0.018 ± 0.001	MS + STD
1-Octen-3-ol	10.892	0.012 ± 0.001	0.003 ± 0.000	0.034 ± 0.003	0.030 ± 0.001	MS + STD
2-Ehyl-1-hexanol	12.072	0.004 ± 0.001	0.003 ± 0.000	0.008 ± 0.001	0.011 ± 0.001	MS
1-Octanol	13.004	0.004 ± 0.000	0.003 ± 0.000	0.009 ± 0.000	0.007 ± 0.001	MS + STD
Total alcohols		0.060 ± 0.003a	0.022 ± 0.003b	0.263 ± 0.020	0.214 ± 0.005
Ketones
2,3-Butanedione	1.940	0.001 ± 0.000	0.001 ± 0.000	ND	0.003 ± 0.000	MS + STD
2-Butanone	2.027	0.004 ± 0.000	0.003 ± 0.001	0.010 ± 0.001	0.009 ± 0.001	MS + STD
2-Heptanone	8.507	0.009 ± 0.001	0.006 ± 0.000	0.017 ± 0.001	0.014 ± 0.005	MS + STD
Total ketones		0.013 ± 0.006	0.010 ± 0.005	0.027 ± 0.007	0.024 ± 0.006
Sulfur and nitrogen-containing compounds
Carbon disulfide	1.754	ND	0.005 ± 0.000	ND	0.015 ± 0.001	MS + STD
Methional	8.912	0.001 ± 0.000b	0.004 ± 0.000a	ND	0.020 ± 0.005	MS + STD
Dimethyl trisulfide	10.570	0.008 ± 0.000	0.005 ± 0.000	0.004 ± 0.000	0.009 ± 0.000	MS + STD
2-Acethylthiazole	11.810	ND	0.006 ± 0.001	ND	0.009 ± 0.000	MS + STD
Total sulfur and nitrogen		0.006 ± 0.000b	0.020 ± 0.009a	0.005 ± 0.000b	0.055 ± 0.001a
Pyrazines
Methylpyrazine	6.377	0.003 ± 0.000	0.003 ± 0.001	0.001 ± 0.000b	0.015 ± 0.001a	MS + STD
2,5-Dimethylpyrazine	9.158	0.012 ± 0.001	0.012 ± 0.002	0.005 ± 0.001	0.025 ± 0.001	MS + STD
2-Ethyl-6-methylpyrazine	11.357	0.0005 ± 0.000b	0.001 ± 0.000a	0.003 ± 0.000	0.004 ± 0.001	MS
3-Ethyl-2,5-dimethylpyrazine	13.187	0.003 ± 0.000	0.004 ± 0.000	0.008 ± 0.002	0.008 ± 0.000	MS
2,5-Dimethyl-3-methylbutylpyrazine	17.717	0.001 ± 0.000	0.001 ± 0.002	ND	ND	MS
Total pyrazines		0.014 ± 0.002	0.020 ± 0.002	0.005 ± 0.001b	0.031 ± 0.004a
Hydrocarbons
Toluene	4.546	0.001 ± 0.000	0.001 ± 0.000	0.004 ± 0.000a	0.001 ± 0.000b	MS + STD
Ethylbenzene	7.574	0.001 ± 0.000	0.001 ± 0.000	0.002 ± 0.000	0.002 ± 0.000	MS + STD
1,3-Dimethylbenzene	7.815	0.006 ± 0.001	0.006 ± 0.001	0.008 ± 0.001	0.007 ± 0.001	MS
2,4,6-Dimethyldecane	11.368	0.001 ± 0.000	ND	0.006 ± 0.000	0.003 ± 0.000	MS
2,6,6-Trimethylheptane	12.517	0.002 ± 0.000	0.001 ± 0.001	0.002 ± 0.000	0.002 ± 0.000	MS
Total hydrocarbons		0.010 ± 0.005	0.008 ± 0.005	0.017 ± 0.009a	0.012 ± 0.004b

IM, by MS from a library or STD.
CD (control diet): pigs were fed a basal diet; ED (experiment diet): pigs were fed a basal diet + 4% lysine, isoleucine, methionine, threonine, valine and tryptophan during growing phase and supplemented with 0.1% chromium picolinate during finishing phase.
Means within a row with different superscripts are significantly different (p < 0.05).
WHD, Woori heukdon; MS, mass spectra; STD, external standards; ND, not detectable.