Effect of alkaline lignin modification on cellulase–lignin interactions and enzymatic saccharification yield

Table 2 Signal assignments of lignin samples in the ¹³C NMR spectrum [25, 26]

δ (ppm)	Assignments	δ (ppm)	Assignments
178-168	Aliphatic COOR	115.6	C₅ in G unit
152.3	C₃/C₅ in S unit	110.6	C₂ in G unit
140-123	Condensed aromatics	103	C_2,6 in S unit
129.2	C₆ in H unit	50–90	Interunit linkages
128	C₂/C₆ H unit		(β-β′, β-5 and β-O-4′)
119	C₆/C₅ in G unit	56.5	OCH₃ in G and S unit

ISSN: 2731-3654