Table 2.

Composition, retention time, formula, molecular weight (M_w) and relative molar abundance (%) of the compounds released after Py-GC/MS of bamboo.

Label	R.T. (min)	Compound name	Formula	Mw	Untreated	Pretreated
Carbohydrate derived compounds
1	2.82	2-Cyclopenten-1-one, 2-hydroxy-	C5H6O2	98	0.9	1.6
2	4.63	2-Hydroxy-gamma-butyrolactone	C4H6O3	102	6.5	2.2
3	5.88	Furan, 2,5-dimethyl-	C6H8O	96	3.3	2.2
4	6.49	2-Furanmethanol	C5H6O2	98	0.8	0.5
5	7.97	2(5H)-furanone	C4H4O2	84	2.3	0.6
6	8.42	2-Cyclopenten-1-one, 2-hydroxy-	C5H6O2	98	4.5	2.3
8	10.89	2-Cyclopenten-1-one, 2-hydroxy-3-methyl-	C6H8O2	112	0.3	0.6
9	11.20	1,2-Cyclopentanedione, 3-methyl-	C6H8O2	112	1.8	0.6
13	13.87	2,4(3H,5H)-furandione, 3-methyl-	C5H6O3	114	1.4	1.1
17	16.38	2-Furancarboxaldehyde, 5-(hydroxymethyl)-	C6H6O3	126	1.1	2.3
28	22.67	β-D-Glucopyranose, 1,6-anhydro-	C6H10O5	162	21.0	65.8
	Sum				43.9	79.9
Lignin guaiacyl-type
10	12.00	Phenol, 2-methyl-	C7H8O	108	1.2	0.4
12	12.85	Phenol, 2-methoxy-	C7H8O2	124	1.5	0.4
14	15.49	Phenol, 2-methoxy-4-methyl-	C8H10O2	138	0.9	0.3
15	15.59	1,2-Benzenediol	C6H6O2	110	1.8	0.5
20	17.80	1,2-Benzenediol, 4-methyl-	C7H8O2	124	0.9	0.5
21	18.37	2-Methoxy-4-vinylphenol	C9H10O2	150	2.8	0.9
24	20.25	Vanillin	C8H8O3	152	1.1	0.4
25	21.23	1,2,4-Trimethoxybenzene	C9H12O3	168	0.7	0.4
26	21.37	Phenol, 2-methoxy-4-(1-propenyl)-	C10H12O2	164	1.2	0.4
27	22.07	Ethanone, 1-(4-hydroxy-3-methoxyphenyl)-	C9H10O3	166	1.6	0.3
30	22.92	2-Propanone, 1-(4-hydroxy-3-methoxyphenyl)-	C10H12O3	180	0.4	Trace
36	25.27	2-Butanone, 4-(4-hydroxy-3-methoxyphenyl)-	C11H14O3	194	0.5	0.2
40	26.84	2-Propenal, 3-(4-hydroxy-3-methoxyphenyl)-	C10H10O3	178	1.6	0.2
41	26.94	4-((1E)-3-Hydroxy-1-propenyl)-2-methoxyphenol	C10H12O3	180	6.4	0.4
	Sum				22.7	5.3
Lignin syringyl-type
18	17.08	1,2-Benzenediol, 3-methoxy-	C7H8O3	140	1.1	0.3
22	19.17	Phenol, 2,6-dimethoxy-	C8H10O3	154	1.9	0.4
29	22.82	Benzene, 1,2,3-trimethoxy-5-methyl-	C10H14O3	182	0.5	Trace
32	23.63	3′,5′-Dimethoxyacetophenone	C10H12O3	180	2.4	0.7
37	25.43	Benzaldehyde, 4-hydroxy-3,5-dimethoxy-	C9H10O4	182	0.9	0.4
38	26.25	Phenol, 2,6-dimethoxy-4-(2-propenyl)-	C11H14O3	194	1.6	0.5
39	26.76	Ethanone, 1-(4-hydroxy-3,5-dimethoxyphenyl)-	C10H12O4	196	0.7	0.3
43	30.25	3,5-Dimethoxy-4-hydroxycinnamaldehyde	C11H12O4	208	0.6	0.4
	Sum				9.7	3.1
Other lignin derived products
7	10.01	Phenol	C6H6O	94	1.4	0.5
11	12.57	Phenol, 3-methyl-	C7H8O2	108	1.0	0.5
16	16.19	4-Methyl-benzaldehyde	C8H8O	120	10.0	2.6
19	17.52	Hydroquinone	C6H6O2	110	0.9	0.2
23	19.47	Benzaldehyde, 4-hydroxy-	C7H6O2	122	0.7	0.3
31	23.31	4-Acetylbenzoic acid	C9H8O3	164	0.9	1.2
33	23.69	1,4-Benzenedicarboxylic acid, methyl ester	C9H8O4	180	0.9	1.3
34	24.07	trans-Cinnamic acid	C9H8O2	148	0.3	0.1
35	25.07	1,4-Benzenedicarboxylic acid	C8H6O4	166	0.9	0.6
	Sum				16.8	7.4
	S/G				0.4	0.6