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Figure 5 | Biotechnology for Biofuels

Figure 5

From: The fate of lignin during hydrothermal pretreatment

Figure 5

HSQC NMR spectra of raw and pretreated cellulolytic enzyme lignin in the aromatic region: (a) raw; (b) 20 mL/min, 140°C, 12 min; (c) 20 mL/min, 140°C, 192 min; (d) 20 mL/min, 180°C, 12 min; (e) 20 mL/min, 180°C, 192 min; (f) 0 mL/min, 140°C, 192 min; (g) 0 mL/min, 180°C, 12 min. Identified units include p-hydroxyphenyl (PB2, 6), guaiacyl (G2, G5, G6), syringyl (S2, 6), and oxidized syringyl (S’2, 6) units. Signal assignments are presented in Table 4.

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