Biology Reference
In-Depth Information
Cellulose
OH
OH
OH
OH
O
O
HO
HO
O
OH
HO
O
O
HO
HO
O
O
OH
OH
OH
OH
n
β
-(1
�
4)-glycosidic linkage
Starch
Amylose
OH
O
OH
O
OH
O
HO
OH
OH
HO
O
O
OH
OH
HO
O
HO
OH
O
HO
OH
n
α
-(1
�
4)-glycosidic linkage
Amylopectin
OH
OH
O
OH
O
O
α
-(1
�
6)-glycosidic linkage
(branching pont)
O
OH
HO
HO
OH
OH
O
HO
O
m
O
OH
O
OH
O
O
OH
O
O
OH
HO
HO
OH
OH
O
HO
O
O
O
HO
OH
n
α
-(1
�
4)-glycosidic linkage
Chitin
OH
OH
NHAc
NHAc
O
HO
HO
O
OH
O
HO
O
O
HO
O
O
HO
NHAc
NHAc
OH
OH
n
Ac =
C
O
CH
3
β
-(1
�
4)-glycosidic linkage
Figure 1.2
Structures of cellulose, starch, and chitin.
well-defined structure, but only a few approaches successfully led
to the production of such polysaccharides. One approach is cationic
ring-opening polymerization of anhydrosugar monomers [13]. After
many attempts for this polymerization using various anhydrosugar
monomers have been made, cellulose with degree of polymerization
(DP) equal to 19.3 was synthesized by the cationic ring-opening
polymerization of 3,6-di-
α
O
-benzyl-
-d-glucose 1,2,4-orthopivalate
