EMAL
sweetgumEMAL
sweetgumSwitchgrass5.5 5.0 4.5 4.0 3.5 3.0807060(^1) H [ppm]
4.24.44.64.85.05.25.4^1 H [ppm] 4.24.44.64.85.05.25.4^1 H [ppm]
95
(1-4)-β-D-Xylp^100
β-D-Xylp(R)
α-D-Xylp(R)
α-L-Araf
α-D-Glcp(R)
(1-4)-β-D-Xylp
α β
γ
(1-4)-β-D-Glcp
2-O-Ac-β-D-Xylp(R)
3-O-Ac-β-D-Xylp(R)
105
13 C [ppm]
95
100
105
13 C [ppm]
100
S: 78.5%G: 21.5%
(H3,5 & pCA3,5)^110
120
7.5 7.0 6.5 6.0^1 H [ppm]
EMAL
sweetgum
Unresolved,unassigned,
polysaccharides, etc.
Phenylcoumaran (β-5) Resinol (β-β)
Dibenzodioxocin (DBZO)
(d)
(a) (b)
(e)
p-Hydroxyphenyl
FerulatesFA p-CoumaratespCA SyringylS
OMe
MeO OMe
O
(^6) S 2
OH
FA
β
β
α
α
γ
γ
OH
OH
4 ʹOO 4 ʺ
5 ʹ 5 ʺ
MeO OMe S/G
βα βα
β γ
α
γ
βʹαʹγʹγ
SG
S/G S/G S/G
S/G
4 ʹOMe (^4) OMe
5 ʹG
O O
O
O
HO HO
HO
OO
α β α
γ
OH
OH
OMe
O
G^26
αOH
O
(^6) H 2
αOH
pCA
O O
(h) Guaiacyl(g)
Cinnamyl alcoholend-groups
β-Aryl ether (β-O-4)
(a) (b)
(c) (d)
MeO
S2,6
G 2
G 5
G 6
S’2,6
Bβ
Bα Cα
Aβ(G)
Aβ(S)
Cβ
Eγ
Aα
Dα
Cγ
13 C [ppm]^13 C [ppm]
Figure 4.7The 2D HSQC spectra of enzymatic mild acidolysis lignin (EMAL) isolated from hardwood [108].