Table 6. Amount (μg/g) of volatile flavor compounds in coarsely-and finely-marbled 1⁺ grade Hanwoo loins

Volatile compounds (μg/g)	RT (min)	Marbling type		Identification method1)
		Coarseness	Fineness
Aldehydes
Propanal	1.701	0.01±0.00	0.01±0.00	MS+STD
Butanal	2.139	0.01±0.01	0.01±0.00	MS+STD
3-Methyl butanal	2.699	0.01±0.00	0.01±0.01	MS+STD
2-Methyl butanal	2.812	0.01±0.00	0.02±0.01	MS+STD
Pentanal	3.286	0.11±0.05	0.10±0.02	MS+STD
Hexanal	6.101	1.32±0.24a	0.77±0.01b	MS+STD
E,2-Hexenal	7.808	ND	0.01±0.00	MS
Heptanal	9.262	0.62±0.29	0.55±0.23	MS+STD
E,2-Heptenal	10.754	0.03±0.02	0.02±0.01	MS
Benzaldehyde	10.866	0.05±0.02	0.05±0.01	MS+STD
Octanal	11.921	0.47±0.02	0.53±0.03	MS+STD
Benzenacetaldehyde	12.873	0.01±0.00	0.01±0.01	MS
E,2-Octenal	13.185	0.05±0.05	0.03±0.01	MS+STD
Nonanal	14.198	0.76±0.04	0.73±0.31	MS+STD
E,2-Nonenal	15.334	0.14±0.07	0.19±0.06	MS+STD
E,4-Decenal	15.938	0.03±0.01	0.04±0.00	MS
Decanal	16.227	0.07±0.03	0.05±0.02	MS+STD
E,2-Decenal	17.267	0.21±0.12	0.14±0.07	MS+STD
Undecanal	18.088	0.03±0.01	0.03±0.00	MS
E,E,2,4-Decadienal	18.296	0.01±0.01	0.01±0.00	MS+STD
2-Undecenal	19.076	0.09±0.05	0.07±0.04	MS
Tridecanal	19.823	0.01±0.01	0.01±0.00	MS
2-Methyl-undecenal	20.651	0.01±0.00	0.01±0.00	MS
Alcohols
1-Pentanol	5.013	0.05±0.03	0.03±0.01	MS+STD
1-Hexenol	8.344	0.03±0.02	0.04±0.02	MS+STD
Ketones
3-Heptanone	8.775	0.01±0.00	0.01±0.00	MS
2-Heptanone	8.889	0.03±0.02	ND	MS+STD
2-Methyl-4-heptanone	10.458	0.03±0.00	0.03±0.00	MS
4-Octanone	11.134	0.05±0.05	0.04±0.02	MS
2,5-Octanedione	11.474	0.09±0.09	0.05±0.03	MS
2-Nonanone	13.887	0.04±0.02	0.03±0.00	MS
Hydrocarbons
Toluene	4.942	0.01±0.00	0.01±0.00	MS+STD
2-Octene	5.751	0.01±0.00	0.01±0.00	MS
1,3-Dimethylbenzene	8.253	0.01±0.00	0.01±0.01	MS
1-Nonene	8.934	ND	0.03±0.02	MS
Nonane	9.193	0.01±0.00	0.01±0.00	MS
2-Methyl hexane	11.091	0.005±0.00	0.01±0.00	MS
Hexanoic acid	11.34	0.02±0.01	0.03±0.02	MS
Decane	11.832	0.02±0.01	0.03±0.02	MS
2-Methyl decane	12.346	ND	0.01±0.00	MS
3-Ethyl-2-methyl-1,3-hexadiene	12.565	0.007±0.01b	0.01±0.00a	MS+STD
2,2-Dimethyl octane	13.289	ND	0.01±0.00	MS
Undecane	14.088	0.01±0.01	0.02±0.01	MS
Z-3-Dodecene	14.758	0.01±0.01	0.02±0.00	MS
Benzoic acid	15.48	0.23±0.13	0.09±0.03	MS
Furans
2-Pentyl furan	11.586	0.10±0.08	0.06±0.03	MS+STD
2-Heptyl furan	16.097	0.02±0.01	0.02±0.00	MS+STD
2-n-Octyl furan	17.887	0.02±0.01	0.01±0.01	MS+STD
Sulfur and nitrogen compounds
Carbon disulfide	1.867	0.003±0.00	0.004±0.00	MS
2,5-Dimethyl pyrazine	9.534	0.02±0.01	0.03±0.02	MS+STD
2-Ethyl-3,5-dimethyl pyrazine	13.568	0.01±0.00	0.02±0.00	MS+STD
5-Butylhydro-2(3H)-furazone	17.161	0.01±0.01	ND	MS

The flavor compounds were identified by mass spectra (MS) from library or external standard (STD).
Means within a same row with different superscripts differ significantly p<0.05.
ND, not detectable.