. 2017 Sep 15;3(9):e1701735. doi: 10.1126/sciadv.1701735

Table 3. Structural characteristics (lignin interunit linkages, PB, aromatic units, and S/G ratio) from integration of ¹H–¹³C correlation peaks in the HSQC spectra of the WCW and three dissolved lignins from poplar wood.

Numbers for Lignin Interunit linkages are percent of the sum of the integrals for structures Aa and Ca is accounted for by the integral for each individual structure. Numbers for PB2/6 are percentage of total lignin content (G + S + S′ ) in each sample spectrum.

	WCW	P75T80t20	P70T65t20	P70T50t20
Lignin interunit linkages
β-O-4 aryl ethers (A)	93	—	87	87
Resinols (C)	7	—	13	13
p-Hydroxybenzoates (PB_2/6)	14	—	22	20
Lignin aromatic units
G (%)	36	—	30	34
S (%)	64	—	70	66
S/G ratio	1.8	—	2.3	1.9

Table 3. Structural characteristics (lignin interunit linkages, PB, aromatic units, and S/G ratio) from integration of 1H–13C correlation peaks in the HSQC spectra of the WCW and three dissolved lignins from poplar wood.

Table 3. Structural characteristics (lignin interunit linkages, PB, aromatic units, and S/G ratio) from integration of ¹H–¹³C correlation peaks in the HSQC spectra of the WCW and three dissolved lignins from poplar wood.