Table 5.

Keto acids in self-made and commercial attractants (percentage of the total peak area).

Keto Acids	Self-Made Attractants		Commercial Attractants
	Volatile Compounds	Relative Content (%)	Volatile Compounds	Relative Content (%)
1	2-Octanone	0.168 ± 0.02 e	2-Octanone	0.160 ± 0.02 c
2	1-Octene-3-ketone	2.620 ± 0.31 b,c	1-Octene-3-ketone	0.517 ± 0.05 b
3	N -caprylic acid	6.834 ± 0.75 a	N -caprylic acid	2.667 ± 0.31 a
4	Nonanoic acid	0.198 ± 0.25 e	Nonanoic acid	0.082 ± 0.00 d
5	Heptylic acid	1.690 ± 0.15 c	Heptylic acid	0.169 ± 0.02 c
6	3-Hexene-2-ketone	0.655 ± 0.77 d	2,3-Pentarone	0.251 ± 0.01 c
7	2-Heptanone	0.589 ± 0.60 d	2-Hydroxy-acetone	0.387 ± 0.03 b,c
8	3-Octene-2-ketone	0.283 ± 0.03 e	Hydroxy acetone	0.679 ± 0.00 b
9	3-Nonene-2 ketone	0.240 ± 0.02 e	2,2,6-Trimethyl-cyclohexanone	0.242 ± 0.02 c
10	Linolenic acid	0.369 ± 0.05 e	2,3-Diketone	1.603 ± 0.08 a
11	Hexanoic acid	1.841 ± 0.21 c	6-Methyl-5-heptene-2-ketone	0.498 ± 0.05 b
12	Acetic acid	1.413 ± 0.17 c	2-Nonyl ketone	0.098 ± 0.01 c,d
13			3,6-Dimethyl-oct-2-ketone	0.050 ± 0.00 d
14			Geranylacetone	0.041 ± 0.00 d
15			2-Pyrrolidone	0.063 ± 0.01 d
16			2-Methyl-2-ethyl-1-propyl propionic acid	0.329 ± 0.05 b,c
17			2-Isobutyric acid	0.192 ± 0.02 c
18			N-decanoic acid	0.981 ± 0.05 a
19			9-Decanoic acid	0.103 ± 0.02 c
20			Pentanoic acid	1.011 ± 0.04 a
21			4-Methylvaleric acid	0.450 ± 0.05 b
Total		16.900 ± 1.33		10.574 ± 1.45

Data are means ± SEM (n = 4). Data with different letters in the same row are significantly different (p < 0.05).