Table 1. VOCs composition emitted from plumeria tissues.

No.a	Compound	RTb	RIc	Formula	Concentrationd			RAe
					Leaf	Bud	Flower	Leaf	Bud	Flower
1	Ethyl propanoate	6.504	706	C5H10O2	–	0.92 ± 0.03	0.86 ± 0.10	–	2.77	0.41
2	8-Aminocaprylic acid	7.175	773	C5H11NO	8.01 ± 0.05	–	1.00 ± 0.02	9.79	–	0.48
3	β-Thujene	9.289	925	C10H16	–	0.29 ± 0.07	–	–	0.89	–
4	α-Pinene	9.455	935	C10H16	6.92 ± 0.19	3.03 ± 1.59	2.04 ± 0.13	8.46	9.07	0.98
5	Camphene	9.727	952	C10H16	2.39 ± 0.40	–	–	2.92	–	–
6	Benzaldehyde	9.896	962	C7H6O	–	–	24.26 ± 0.09	–	–	11.77
7	Sabinene	10.084	973	C10H16	2.65 ± 0.21	2.99 ± 0.13	2.44 ± 0.19	3.24	8.98	1.17
8	β-Pinene	10.193	980	C10H16	2.25 ± 0.01	0.69 ± 0.04	0.40 ± 0.01	2.75	2.08	0.19
9	β-Myrcene	10.259	984	C10H16	–	0.42 ± 0.04	0.63 ± 0.02	–	1.26	0.30
10	6-Methyl-5-octen-2-one	10.783	1,015	C9H16O	–	0.14 ± 0.02	–	–	0.43	–
11	Limonene	11.034	1,030	C10H16	1.36 ± 0.04	2.23 ± 0.08	2.24 ± 0.03	1.66	6.69	1.08
12	Eucalyptol	11.107	1,034	C10H18O	–	17.24 ± 1.71	10.36 ± 0.10	–	51.68	4.98
13	β-Ocimene	11.264	1,043	C10H16	45.43 ± 2.48	–	–	55.53	–	–
14	2-Phenylacetaldehyde	11.299	1,045	C8H8O	–	–	12.09 ± 0.12	–	–	5.82
15	β-Linalool	12.166	1,096	C10H18O	2.10 ± 0.00	–	–	2.56	–	–
16	Geranyl benzoate	12.194	1,098	C17H22O2	–	–	12.51 ± 0.12	–	–	6.02
17	2H-Pyran-3(4H)-one, 6-ethenyldihydro-2,2,6-trimethyl-	12.382	1,109	C10H16O2	–	0.14 ± 0.02	–	–	0.43	–
18	2-Phenylethyl alcohol	12.569	1,120	C8H10O	–	–	74.16 ± 1.06	–	–	35.67
19	Benzyl nitrile	12.979	1,144	C8H7N	–	–	14.57 ± 0.26	–	–	7.01
20	α-Terpineol	13.853	1,196	C10H18O	–	–	2.91 ± 0.11	–	–	1.40
21	Methyl salicylate	13.945	1,201	C8H8O3	–	–	5.84 ± 0.11	–	–	2.81
22	(E)-Phenylacetaldoxime	14.748	1,251	C8H9NO	–	–	3.36 ± 0.25	–	–	1.62
23	(Z)-Phenylacetaldoxime	15.094	1,272	C8H9NO	–	–	3.81 ± 0.23	–	–	1.84
24	2-Phenylnitroethane	15.632	1,305	C8H9NO2	–	0.11 ± 0.05	7.41 ± 0.29	–	0.34	3.56
25	Elemene isomer	16.254	1,346	C15H24	0.24 ± 0.05	0.11 ± 0.01	0.25 ± 0.02	0.29	0.32	0.12
26	α-Copaene	16.898	1,388	C15H24	0.99 ± 0.28	0.85 ± 0.02	0.95 ± 0.14	1.21	2.55	0.46
27	β-Elemene	17.086	1,400	C15H24	0.11 ± 0.03	–	0.21 ± 0.02	0.14	–	0.10
28	β-Caryophyllene	17.623	1,437	C15H24	4.41 ± 0.29	1.79 ± 0.03	0.72 ± 0.04	5.39	5.38	0.35
29	(E)-α-Bergamotene	17.700	1,442	C15H24	0.31 ± 0.02	0.14 ± 0.05	0.30 ± 0.01	0.37	0.42	0.15
30	(E)-β-Farnesene	17.862	1,453	C15H24	1.31 ± 0.06	0.60 ± 0.13	1.23 ± 0.00	1.60	1.81	0.59
31	α-Caryophyllene	18.117	1,471	C15H24	0.27 ± 0.06	0.17 ± 0.04	–	0.33	0.51	–
32	Germacrene D	18.497	1,497	C15H24	1.44 ± 0.05	0.29 ± 0.00	0.59 ± 0.01	1.77	0.88	0.28
33	α-Farnesene	18.603	1,504	C15H24	0.27 ± 0.06	–	3.68 ± 0.02	0.33	0.15	1.77
34	Bicyclogermacrene	18.712	1,512	C15H24	0.68 ± 0.11	0.34 ± 0.04	0.51 ± 0.01	0.83	1.01	0.25
35	(Z)-γ-Bisabolene	18.860	1,523	C15H24	0.26 ± 0.11	0.14 ± 0.00	0.28 ± 0.04	0.31	0.42	0.13
36	δ-Cadinene	19.008	1,533	C15H24	0.25 ± 0.09	0.30 ± 0.08	0.36 ± 0.09	0.31	0.90	0.17
37	(E)-γ-Bisabolene	19.069	1,538	C15H24	0.17 ± 0.13	–	0.19 ± 0.02	0.20	0.28	0.09
38	(E)-Nerolidol	19.423	1,563	C15H26O	–	–	0.38 ± 0.04	–	–	0.18
39	β-Caryophyllene epoxide	19.992	1,604	C15H24O	–	0.22 ± 0.03	–	–	0.67	–
40	Stearyl acetate	27.041	2,196	C20H40O2	–	–	0.86 ± 0.09	–	–	0.42
41	1-[(Trimethylsilyl)oxy]-2-methylanthraquinone	28.195	2,309	C18H18O3Si	–	–	0.87 ± 0.02	–	–	0.42
42	Advastab 405	29.369	2,430	C23H32O2	–	–	10.38 ± 0.34	–	–	4.99
43	Ethylhexyl phthalate	30.481	2,550	C24H38O4	–	–	4.98 ± 0.10	–	–	2.40

^aCompounds are listed in the same order as their elution from the HP-5MS column.

^bRetention time in minutes.

^cRetention indices calculated using C₇-C₃₀ n-alkanes on the HP-5MS column.

^dData (ng g⁻¹ fresh weight h⁻¹) are means ± se of three replicates.

^eRelative abundance in percentage.