Table 2.

The pine resin VOCs composition obtained by HS-SPME and from the resin CH₂Cl₂ solution after direct GC and GC-MS analysis.

No.	Compound	RI	A	B	C
1.	Toluene	< 900	0.3	3.2	-
2.	α-Pinene	941	73.4	66.2	52.0
3.	Camphene	958	2.1	3.8	4.2
4.	Verbenene	961	0.6	0.7	3.5
5.	Benzaldehyde	965	-	0.2	-
6.	β-Pinene	983	1.0	0.9	0.3
7.	Myrcene	994	0.4	0.2	-
8.	Δ-3-Carene	1016	0.3	0.2	-
9.	p-Cymene	1032	0.5	1.4	0.9
10.	Limonene	1035	2.9	4.4	1.5
11.	α-Terpinolene	1093	0.3	0.3	-
12.	p-Cymenyl	1095	0.4	2.3	1.5
13.	Fenchol	1123	0.1	0.2	0.7
14.	α-Campholene aldehyde	1133	0.4	0.4	0.9
15.	trans-Pinocarveol	1148	0.3	0.4	1.0
16.	Camphor	1153	0.2	0.1	0.3
17.	Borneol	1175	0.2	0.3	3.8
18.	Terpinen-4-ol	1185	0.1	0.1	-
19.	p-Cymen-8-ol	1194	0.2	0.4	0.6
20.	α-Terpineol	1198	0.7	1.1	2.3
21.	Estragole	1204	0.8	0.9	-
22.	Verbenone	1217	0.4	0.6	2.4
23.	β-Caryophyllene	1425	5.7	2.0	3.0
24.	β-Selinene	1460	1.1	0.4	-
25.	α-Muurolene	1506	2.3	1.6	2.0
26.	Caryophyllene oxide	1589	0.8	0.2	-
27.	Methyl dehydroabietate	2477	-	-	2.7
	Total identified (%)		95.5	92.5	83.6

RI = retention indices on HP-5MS column; A = solvent-free HS-SPME with the fiber PDMS/DVB; B = solvent-free HS-SPME with the fiber DVB/CARPDMS; C – the residue dissolved in CH₂Cl₂; - = not identified; ^* – tentatively identified; ^** – correct isomer not identified.