Skip to main content

Table 2 Assignments of 13C–1H correlation signals in the HSQC spectrum of lignin samples

From: Laccase pretreatment of wheat straw: effects of the physicochemical characteristics and the kinetics of enzymatic hydrolysis

Label

δCH (ppm)

Assignment

Bβ

53.4/3.11

Cβ–Hβ in β–β (resinol) (B)

–OMe

56.2/3.78

C–H in methoxyls

Aγ

59.5–59.7/3.25–3.73

Cγ–Hγ in β-O-4 substructures (A)

Bγ

71.45/4.17–3.78

Cγ–Hγ in β–β resinol (B)

Aα

71.59/4.83

Cα–Hα in β-O-4 unit (A)

Aβ

84.78/4.32

Cβ–Hβ in β-O-4′ substructures linked to a G unit (A)

Bα

85.55/4.62

Cα–Hα in β–β resinol (B)

Cα

86.6/5.49

Cα–Hα in β-5 (phenylcoumaran) substructures

G2

110.89/6.94

C2–H2 in guaiacyl units (G)

FA2

110.9/7.26

C2–H2 in FA

G5

115.74/6.79

C5–H5 in guaiacyl units (G)

G6

119.33/6.8

C6–H6 in guaiacyl units (G)

FA6

122.6/7.03

C6–H6 in FA

H2,6

127.5/7.23

C2,6–H2,6 in H units (H)