Table 5.

Volatile organic compounds of the microalgae P. autumnale and S. obliquus.

LRI DB-Waxa	Compounds	Relative Peak Area (%)b
		P. autumnale	S. Obliquus
611	acetaldehyde	0.29 ± 0.02	0.24 ± 0.02
626	propanal	0.01 ± 0.00	0.21 ± 0.00
632	2-methyl propanal	ndc	0.06 ± 0.01
634	2-propanone	4.77 ± 0.34	0.55 ± 0.05
639	4-methyl-3-pentenal	0.01 ± 0.00	nd
643	2-propenal	nd	0.02 ± 0.00
653	2-methyl furan	0.17 ± 0.01	0.10 ± 0.01
656	butanal	0.12 ± 0.01	0.32 ± 0.02
670	2-butanone	0.89 ± 0.03	0.58 ± 0.02
673	methyl propionate	nd	0.38 ± 0.01
676	2-methyl butanal	0.09 ± 0.00	0.07 ± 0.01
679	3-methyl butanal	0.09 ± 0.00	0.67 ± 0.03
693	2-propanol	0.15 ± 0.00	nd
1018	ethyl propanoate	nd	1.46 ± 0.11
1031	ethyl isobutanoate	nd	0.47 ± 0.03
1047	pentanal	0.72 ± 0.02	2.49 ± 0.18
1086	2,6-dimethyl nonane	0.31 ± 0.00	0.22 ± 0.01
1115	toluene	0.99 ± 0.01	0.78 ± 0.02
1123	propanol	0.15 ± 0.00	5.33 ± 0.24
1124	3-methyl-1-buten-3-ol	0.20 ± 0.01	nd
1129	ethyl 2-methylbutyrate	nd	0.04 ± 0.00
1133	2,3-pentanedione	0.04 ± 0.00	0.16 ± 0.00
1137	2-ethyl-3-methylbutanal	0.01 ± 0.00	0.03 ± 0.00
1146	hexanal	3.90 ± 0.23	3.16 ± 0.15
1149	methyl pentanoate	nd	0.29 ± 0.03
1170	3-pentanol	nd	0.04 ± 0.00
1178	2-nonanol	0.07 ± 0.01	nd
1179	2-pentenal	nd	1.64 ± 0.08
1190	2-ethyl-trans-2-butenal	nd	0.18 ± 0.02
1193	butanol	0.98 ± 0.03	3.02 ± 0.08
1215	2-nonanone	0.04 ± 0.00	nd
1230	limonene	0.43 ± 0.02	0.32 ± 0.01
1233	3-penten-2-ol	nd	0.12 ± 0.01
1246	1,8-cineole	0.12 ± 0.00	0.14 ± 0.01
1251	3-methyl butanol	0.84 ± 0.07	8.01 ± 0.69
1258	2-hexenal	nd	3.31 ± 0.20
1266	2-pentyl furan	0.63 ± 0.03	0.03 ± 0.00
1274	ethyl hexanoate	0.09 ± 0.00	1.52 ± 0.11
1278	6-methyl-2-heptanone	0.47 ± 0.04	nd
1294	1-pentanol	3.37 ± 0.22	4.28 ± 0.18
1325	3-penten-1-ol	nd	0.20 ± 0.02
1330	octanal	0.31 ± 0.02	0.17 ± 0.02
1362	2-butyl octanol	nd	2.46 ± 0.17
1363	2-propyl heptanol	4.46 ± 0.28	4.50 ± 0.20
1385	6-methyl-hept-5-en-2-one	2.22 ± 0.04	0.61 ± 0.02
1407	hexanol	11.77 ± 0.59	11.05 ± 0.24
1461	3-hexen-1-ol	nd	0.03 ± 0.00
1473	nonanal	0.41 ± 0.02	nd
1500	2-hexen-1-ol	nd	0.88 ± 0.04
1529	1-octen-3-ol	1.15 ± 0.02	1.76 ± 0.20
1535	heptanol	1.24 ± 0.15	0.89 ± 0.05
1543	2-cyclohexen-1-one	0.14 ± 0.01	0.39 ± 0.02
1558	2-ethyl hexanol	4.36 ± 0.27	nd
1577	2-ethyl-2-pentenal	nd	0.36 ± 0.05
1586	n-tridecanol	0.34 ± 0.04	nd
1596	linalool	0.28 ± 0.01	nd
1606	octanol	0.99 ± 0.10	nd
1621	3,5-octadien-2-one	0.18 ± 0.00	0.73 ± 0.01
1647	β-caryophyllene	nd	0.67 ± 0.07
1658	oct-3-en-2-ol	35.68 ± 0.78	18.42 ± 1.29
1663	nonadecanol	0.43 ± 0.02	nd
1671	β-cyclocitral	5.77 ± 0.26	1.15 ± 0.14
1682	butyrolactone	0.05 ± 0.01	1.91 ± 0.10
1695	safranal	0.66 ± 0.03	1.11 ± 0.06
1707	nonanol	1.53 ± 0.05	nd
1702	1,4-cyclohexanedione	nd	0.19 ± 0.02
1715	3-ethyl-2,4-pentanedione	0.83 ± 0.02	nd
1724	γ-valerolactone	0.17 ± 0.00	0.47 ± 0.05
1747	keto-Isophorone	nd	2.71 ± 0.35
1759	γ-hexalactone	nd	2.64 ± 0.31
1784	tetradecanol	nd	0.55 ± 0.07
1786	l-carvone	nd	0.07 ± 0.01
1835	3,4-dimethylcyclohexanol	0.86 ± 0.04	0.14 ± 0.01
1855	2,5-dimethyl-1-hepten-4-ol	0.05 ± 0.00	0.10 ± 0.00
1855	2-ethyl butanal	nd	0.13 ± 0.00
1869	γ-heptalactone	0.02 ± 0.00	0.13 ± 0.01
1892	furan	0.10 ± 0.01	0.05 ± 0.00
1889	α-ionone	nd	1.42 ± 0.20
1918	4,8-dimethyl-1,7-nonadien-4-ol	1.14 ± 0.01	1.86 ± 0.21
1988	trans-β-ionone	3.83 ± 0.32	2.09 ± 0.28
2000	benzothiazole	0.12 ± 0.01	0.18 ± 0.02
2002	6-methyl-7-octen-2-one	0.04 ± 0.01	0.61 ± 0.01
2006	dodecanol	0.09 ± 0.00	0.07 ± 0.01
2028	7,8-epoxy-α-ionone	nd	0.08 ± 0.00
2038	phenol	0.03 ± 0.00	0.17 ± 0.02
2044	β-ionone epoxide	0.92 ± 0.03	1.17 ± 0.15

^aLinear Retention Indices in the DB-Wax column.

^bMean and standard deviation often independent experiments.

^cnd: not detected.