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Table 2 Lignin compounds in aqueous phase after WEx pretreatment determined by GC-MS: (a) 165 °C, 18 min; (b) 165 °C, 30 min; and (c) 175 °C, 24 min

From: Wet explosion pretreatment of loblolly pine leads to an increase in methoxylation of the lignin

S. no. Retention time Compound name Origin Peak area Structure
  (min)    (a) (b) (c)  
1. 6.81 Syringol S 8.18E+05 1.91E+06 1.74E+06
2. 7.45 Vanillin G 2.86E+07 4.10E+07 4.47E+07
3. 8.15 4-Propyl Guaiacol G n/d 5.55E+05 3.56E+06
4. 8.50 Acetovanillone G 9.42E+05 1.41E+06 1.70E+06
5. 9.01 Homovanillyl alcohol G n/d 1.63E+06 n/d
6. 9.44 Isovanillic acid G 4.67E+06 1.09E+07 1.05E+07
7. 10.46 4-Hydroxy-3-methoxyphenyl glycol G 8.34E+05 1.86E+06 n/d
8. 10.55 Syringaldehyde S 1.66E+07 2.42E+07 2.00E+07
9. 11.34 Guaiacyl acetone G n/d 3.62E+06 8.37E+06
10. 11.49 Coniferyl aldehyde G 5.38E+06 1.05E+07 1.81E+07
11. 12.40 Syringic acid S 1.42E+06 1.96E+06 1.94E+06
12. 14.84 Sinapaldehyde S 2.18E+06 2.38E+06 3.76E+06