Biomedical Engineering Reference
In-Depth Information
O
O
O
O
O
O
O
O
O
O
O
O
HO
HO
CH
3
HO
HO
N
NH
2
N
+
NH
CH
3
N
COO
-
OH
CH
3
CH
3
R = -CH
2
CH
2
NH
2
R = CH
2
CH
2
NEt
2
H
3
C
CH
2
R
O
R= -CCl
3
, -CBr
3
, -CH
3
, -CH
2
CH
3
, -CH(CH
3
)
2
OR
OR
OH
O
O
R =
SO
2
O
NH
2
O
O
O
O
O
HO
O
HO
HO
NH
NH
H
3
C
SO
2
NH
SO
2
O
Cl
N
N
R
S
S
HO
OH
R =
=
SO
2
OH
NHCOCH
3
SO
3
OH
OH
OSO
3
H
O
OH
O
OH
O
O
O
O
O
O
HO
HO
O
O
O
NH
2
O
O
H
3
OSO
N
H
HO
HO
NHSO
3
H
H
2
CH
NH
n
NH
R
H/OH
OMe
SO
2
SO
2
OH
R =
H/OH
Cl
Figure 6.3
Chitosan derivatives evaluated for antioxidant activity (a) quaternizezd chitosan (b) chitosan-N-2-hydroxypropyl trimethyl ammonium
chloride (c) succinyl chitosan) (d) gallic acid conjugated chitosan (e) sulfanilamide derivative of chitosan (f ) 1,3,5-ththiadiazine-2-thione
substituted chitosan (g) 2-(4(or2)-hydroxyl-5-chloride-1,3-benzene-di-sulfanimide)-chitosan (h) sulfated chitosan (i) eugenol grat ed chitosan.
