. 2018 Dec;56(4):562–572. doi: 10.17113/ftb.56.04.18.5738

Table 3. Volatile components of cold-pressed rapeseed oil (CPRO) and virgin rapeseed oil (VRO) produced after conditioning of the seeds at 60, 80 and 100 °C.

Component		Sample						Kovats index
		CPRO	VRO-60	VRO-80	VRO-100
		Peak area∙10⁷
Isothiocyanates						CPRO	VRO-60	VRO-80	VRO-100
1-isothiocyanatobutane^*#	929¹	(8.3±0.1)^b	(9.7±1.0)^c	nd^a	nd^a
4-isothiocyanato-1-butene^*#	982¹	(2744.6±124.0)^b	(4181.6±188.8)^c	(553.3±49.5)^a	(910. 9±104.9)^a
4-methypentylisothiocyanate^*§	1161	(10.6±0.2)^b	(13.0±1.9)^c	nd^a	nd^a
Eprithionitriles
1-cyano-3,4-epithiobutane^*#	1118²	(132.3±1.5)^d	(29.1±6.5)^c	nd^a	(15.9±7.0)^b
1-cyano-4,5-epithiopentane*	1195	nd^a	nd^a	nd^a	(22.3±9.3)^b
Nitriles
2-methyl-2-butenenitrile*	<800	(172.9±3.5)^a	(193.1±4.5)^a	(234.3±27.1)^a	(2680.6±145.5)^b
2,4-pentadienenitrile*	<800	nd^a	nd^a	(5.7±0.7)^a	(190.6±9.7)^b
2-methyl-5-hexenenitrile*	869	(73.1±6.5)^a	(107.6±7.9)^a	(168.9±28.9)^a	(2421.4±245.9)^b
5-methylhexanenitrile*	948	nd^a	nd^a	nd^a	(17.8±2.1)^b
heptanenitrile^*§	953	(63. 7±0.7)^a	(59.6±5.0)^a	(58.5±9.4)^a	(178.2±2.2)^b
benzenepropanenitrile^*§	1234	nd^a	nd^a	nd^a	(25.0±5.3)^b
Sulfur components
carbonil sulfide*	<800	(39.4±2.0)^b	(40.7±1.9)^b	nd^a	(62.6±5.2)^c
ethanethiol*	<800	(21.4±1.7)^a	(15.1±3.0)^a	(14.1±5.2)^a	(283.3±15.0)^b
dimethyl sulfide*	<800	(62.4±2.9)^b	(26.9±8.4)^a	(34.4±4.2)^a	(54.7±9.4)^b
carbon disulfide*	<800	(114.5±9.5)^c	(7.7±1.4)^a	(87.4±9.5)^b	nd^a
dimethyl sulfone^*§	915	nd	5.3±1.2	9.9±4.8	nd
4-ethyl-5-methyl thiazole^*§	1079	(450.7±9.0)^c	(692.4±33.5)^d	(132.2±22.0)^a	(270.5±17.1)^b
Pyrazines
2-methylpyrazine^*§	820	nd^a	nd^a	nd^a	(135.7±3.1)^b
2,5-dimethylpyrazine^*§	911	nd^a	nd^a	nd^a	(205.1±13.6)^b
2-ethylpyrazine^*§	915	nd^a	nd^a	nd^a	(57.3±6.6)^b
2,6-dimethylpyrazine^*§	916	nd^a	nd^a	nd^a	(78.3±3.7)^b
2-ethyl-6-methylpyrazine^*§	996	nd^a	nd^a	nd^a	(58.0±12.6)^b
2-ethyl-3-methylpyrazine^*§	998	nd^a	nd^a	nd^a	(51.2±4.5)^b
2-ethyl-5-methylpyrazine^*§	999	nd^a	nd^a	nd^a	(79.0±7.6)^b
3-ethyl-2,5-dimethylpyrazine^*#	1075¹	nd^a	nd^a	nd^a	(67.9±6.9)^b
Other nitrogen components
urea*	<800	nd^a	nd^a	nd^a	(159.7±23.5)^b
2,5-dimethylpyrroline*	<800	nd	6.9±1.4	nd	nd
isopropyl-1-butanamine*	806	nd^a	nd^a	nd^a	(26.6±1.8)^b
4-methyl-2-pyrrolidinone*	880	(20.4±1.9)^b	(34.5±7.7)^c	nd^a	nd^a
1-(1H-pyrrol-2-yl)ethanone^*§	1063	nd^a	nd^a	nd^a	(10.5±1.1)^b
Furan derivatives
furfural^*§	828	nd^a	nd^a	nd^a	(719.2±23.5)^b
2-furanmethanol^*§	858	nd^a	nd^a	nd^a	(96.5±4.5)^b
dihydro-2(3H-)-furanone^*§	907	(6.8±1.9)^a	(13.6±1.6)^a	(12.9±4.1)^a	(78.7±7.1)^b
5-methyl-2-furfural^*§	962	nd^a	nd^a	nd^a	(177.6±11.5)^b
5-ethyldihydrofuran-2(3H)-one^*§	1049	(5.6±0.7)^ab	(9.3±1.0)^c	(5.5±3.7)^bc	nd^a
Aldehydes
propanal*	<800	nd^a	nd^a	nd^a	(42.6±2.9)^b
3-methylbutanal*	<800	nd^a	(1.5±0.1)^a	(15.5±4.2)^b	(39.1±4.1)^c
2-methylbutanal*	<800	nd^a	nd^a	(23.3±4.4)^b	(76.7±17.2)^c
hexanal^*§	801	(350.5±14.6)^b	(179.2±2.4)^a	(316.5±27.1)^b	(248.2±9.5)^a
heptanal^*§	902	(57.3±6.0)^abc	(44.6±3.1)^ab	(69.9±5.4)^abc	(75.1±11.8)^ac
2-heptenal^*§	960	10.3±3.4	8.4±0.4	14.6±2.0	nd
octanal^*§	1003	(29.7±1.6)^a	(34.6±6.8)^a	(40.6±5.2)^a	(57.4±4.9)^b
phenylacetaldehyde^*#	1042³	nd^a	nd^a	(10.6±2.1)^a	(52.0±4.0)^b
2-octenal^*§	1058	nd	1.6±0.6	2.4±0.9	10.4±1.3
nonanal^*§	1103	(21.7±0.9)^a	(33.1±5.4)^a	(50.2±6.0)^b	(79.1±7.7)^c
Ketones
2,3-pentadione*	<800	nd^a	nd^a	(34.0±5.0)^a	(99.7±12.5)^b
2-heptanone^*§	891	nd^a	(1.4±0.4)^a	(4.2±1.8)^a	(21.0±4.4)^b
6-methyl-5-hepten-2-one^*§	987	23.2±8.5	38.1±2.6	30.7±8.8	36.7±2.8
3-octen-2-one^*§	1039	(9.2±1.2)^abc	(6.3±1.2)^ab	(8.5±2.7)^abc	(17.0±4.4)^ac
1-phenylethanone^*§	1065	(8.0±0.2)^b	nd^a	nd^a	nd^a
Alcohols
2-methylbutanol*	<800	nd	4.9±0.5	2.9±1.7	nd
n-pentanol*	<800	(96.1±3.4)^c	(73.8±8.9)^b	(70.8±9.7)^b	nd^a
n-hexanol^*§	874	(157.9±6.5)^b	(114.0±19.9)^b	(135.3±37.1)^b	(16.1±2.2)^a
3-hepten-1-ol*	880	nd^a	nd^a	nd^a	(61.5±17.0)^b
n-heptanol^*§	976	(9.6±1.6)^b	(17.7±2.0)^c	(2.6±1.2)^ab	nd^a
2-methyl-6-hepten-1-ol^*§	997	(56.0±5.2)^b	(58.2±11.2)^b	(43.0±8.7)^b	nd^a
2,5-dimethylcyclohexanol^*§	1094	(6.8±2.1)^b	nd^a	nd^a	nd^a
Other components
2,2,3,3-tetramethylbutane*	<800	18.0±3.2	5.4±4.7	12.3±2.3	6.2±1.6
2,2,4-trimethylpentane*	<800	(72.8±3.9)^b	(35.2±7.1)^a	(81.3±7.3)^b	(28.3±4.8)^a
limonene^*§	1027	(11.0±2.5)^a	(11.3±1.5)^ab	(14.8±0.7)^b	(18.4±0.9)^c
2-methoxy-4-vinylphenol^*§	1305	nd^a	nd^a	nd^a	(23.6±6.9)^b

nd=not detected

*The compound was identified by comparison of mass spectra with mass spectra from NIST 05 (21)

^§The compound was identified by comparison of retention indices with the ones obtained from the NIST 05 mass spectra library (21)

^#The compound was identified by comparison of retention indices with the ones in the literature (¹Wei et al. (14), ²Kato et al. (22), ³Siegmund and Murkovic (10)). Different lowercase letters in the same row indicate significant difference between samples (Tukey’s test, p≤0.05)