Yield, Quality, and Antioxidant Activity of Clove (Syzygium aromaticum L.) Bud Oil at the Different Phenological Stages in Young and Mature Trees

Table 2

Chemical composition and concentration of clove bud oil at different bud stages and tree ages.

No.	RT^∗	SI^∗∗	Compound name^∗∗∗	Chemical formula	Concentration (%)
					Young trees			Mature trees
					Budding-3	Full budding	Flowering	Budding-3	Full budding	Flowering
1.	5.166	76	Mesitylene	C9H12	—	—	—	—	0.93	—
2.	5.916	95	Psi-cumene	C9H12	3.72	3.58	2.93	2.01	3.03	2.50
3.	6.810	84	Hemimellitene	C9H12	1.58	1.69	1.24	0.81	1.29	1.14
4.	7.658	70	2-Indanol	C9H10O	—	—	1.15	—	—	0.32
5.	7.885	80	p-Cymene	C10H14	0.53	0.70	1.35	—	1.18	—
6.	8.484	86	3-Ethyl-o-xylene	C10H14	0.98	1.05	-	0.67	—	1.42
7.	8.709	91	4-Ethyl-o-xylene	C10H14	2.25	2.30	1.75	1.10	2.14	1.51
8.	9.631	87	1,2,3,4-Tetramethylfulvene	C10H14	1.76	2.10	1.42	1.04	2.02	1.22
9.	9.762	91	Prehnitene	C10H14	2.17	2.87	1.67	1.44	2.73	1.68
10.	10.329	49	Isolongifolene	C15H24	0.99	—	—	—	—	—
11.	16.222	96	Eugenol	C10H12O2	68.05	74.62	81.33	71.89	77.61	82.38
12.	17.653	90	β-cis-Caryophyllene	C15H24	7.70	4.46	2.44	5.57	2.53	3.21
13.	18.447	60	α-Humulene	C15H24	—	—	0.21	—	—	0.39
14.	20.013	89	Eugenol acetate	C12H14O3	10.26	6.62	4.32	15.47	6.54	3.93
15.	21.290	61	Caryophyllene oxide	C15H24O	—	—	0.18	—	—	0.30
Total					100.00	100.00	100.00	100.00	100.00	100.00

^∗RT: retention time (minute); ^∗∗SI: similarity index based on mass spectrometry. Compound names were identified ^∗∗∗by NIST11 Library. The results were average from three replications.