Table 3. Pyrolysis-GC-MS Base Peak Integrals of Known Lignin Fragments^a.

compounds	RT (min)	IBL	IEL	IML	IFL	SEL
phenol	7.20	12.04	40.03	53.16	30.14	40.57
2-methylphenol	8.50	0.72	0.88	1.19	1.92	2.11
4-methylphenol	8.61	0.46	0.67	1.01	1.90	2.42
2-methoxyphenol	8.94	20.25	29.08	24.93	38.19	29.55
2-methoxy-6-methylphenol	10.40	6.00	0.96	1.25	2.45	1.73
4-methyl-2-methoxyphenol	10.58	7.38	4.62	4.14	9.69	8.41
3,4-dimethoxytoluene	11.30	0.19	0.21	0.28	0.38	0.36
3-methoxy-1,2-benzenediol	11.46	0.63	0.02	0.01	0.12	0.31
4-ethyl-2-methoxyphenol	11.84	2.92	1.08	1.52	2.14	3.10
2-methoxy-4-vinylphenol	12.35	9.03	5.81	6.45	3.01	2.76
2,6-dimethoxyphenol	12.84	19.95	7.86	3.49	4.88	2.13
eugenol	12.91	0.87	0.61	0.51	0.34	0.48
2-methoxy-4-propylphenol	13.04	0.68	0.21	0.18	0.42	0.45
vanillin	13.62	1.19	1.31	0.10	0.39	0.52
cis-isoeugenol	13.65	0.55	0.24	0.18	0.14	0.09
2,6-dimethoxy-4-methylphenol	14.11	6.16	0.71	0.24	0.61	0.68
trans-isoeugenol	14.22	2.97	0.94	0.39	0.29	0.37
acetovanillone	14.62	0.64	0.54	0.06	0.15	0.36
1-(4-hydroxy-3-methoxyphenyl) 2-propanone	15.17	0.79	0.20	0.03	0.12	0.17
4-ethylsyringol	15.19	1.17	0.07	0.01	0.06	0.17
4-vinylsyringol	15.48	3.55	0.20	0.04	0.11	0.68
5-methoxyeugenol	16.04	0.82	0.04	0.01	0.03	0.17
cis-isomethoxyeugenol	16.42	0.27	0.02	0.00	0.01	0.08
syringaldehyde	16.55	0.01	1.82	0.42	1.26	1.15
trans-isomethoxyeugenol	17.18	0.72	0.12	0.03	0.11	0.60
acetosyringone	17.61	0.02	1.77	0.37	1.16	0.57
SUM		100	100	100	100	100
SUM C0–C2b		92.3	97.6	98.7	98.5	97.6
SUM C3c		7.7	2.4	1.3	1.5	2.4

^aAnalysis shows relative abundance of the most important lignin pyrolysis fragments. Abundances of compounds having side chains of less than three carbons (C0–C2) were added together and compared to the sum of compounds with three carbon (C3) side chains. RT shows the retention time of each fragmented compound.

^bC0–C2 represents lignin fragments with 0–2 carbon aliphatic side chains.

^cC3 represents lignin fragments with three carbon aliphatic side chains.