Table 4 Assignment of 13C-1H correlation signals detected in HSQC spectra of cellulolytic enzyme lignin isolated from Populus trichocarpa x P. deltoides wood samples[37]
δC/δH(ppm) | Assignment |
|---|---|
53.2/3.5 | Cβ/Hβ in phenylcoumarin substructure (Bβ) |
53.6/3.1 | Cβ/Hβ in resinol (β-β) substructure |
55.7/3.8 | C/H in methoxyl group (Methoxy) |
60.2/3.6 | Cγ/Hγ in β-O-4 substructure (Aγ) |
62.8/3.8 | Cβ/Hβ in phenylcoumarin substructure (Bβ) |
71.5/4.8 | Cα/Hα in β-O-4 linkage (Aα) |
84.8/4.3 | Cβ/Hβ in β-O-4 linkage (Aβ) |
81.4/5.1 | Cβ/Hβ in spirodienone substructure (Cβ) |
84.7/4.7 | Cα/Hα in spirodienone substructure (Cα) |
87.1/5.5 | Cα/Hα in phenylcoumarin substructure (Bα) |
104.3/6.7 | C2,6/H2,6 in etherified syringyl units (S2,6) |
105.5/7.3 | C2,6/H2,6 in oxidized Cα=O (S'2,6) |
113.7/6.3 | Cβ/Hβ in cinnamate unit (Eβ) |
111.4/7.0 | C2/H2 in guaiacyl units (G2) |
115.4/6.77 | C5/H5 in guaiacyl units (G5) |
119.3/6.82 | C6/H6 in guaiacyl units (G6) |
130.0/7.5 | C2,6/H2,6 in p-hydroxybenzoate units (PB2,6) |
144.7/7.5 | Cα/Hα in cinnamate unit (Eα) |