Biomedical Engineering Reference
In-Depth Information
O
CH
3
O
R
O
OCHC
OCH
2
C
OCH
C
n
n
n
14
15
16
O
CH
3
O
CH
3
O
O
C
CH
OC
CH
O
C CH
2
OCCH
2
O
m
n
17
R
O
OO
NP
C(CH
2
)
5
O
n
OCRCO
R
n
n
20
18
19
CH
3
O
OH
H
3
CH
2
C
O
O
O
C
C
C
C
O
OO
CH
2
CH
3
R
O
CH
3
HO
O
n
n
O
21
22
O
O(CH
2
)
2
OCH
2
C
n
23
(B)
(B) Synthetic biodegradable: 14. poly(glycolicacid), 15. poly(lactic acid),
16. poly(hydroxyalkanoate), 17. poly(lactide-
co
-glycolide), 18. poly
(
-caprolactone), 19. polyanhydride, 20. polyphsphazene, 21. poly(ortho-
ester), 22.poly(propylene fumarate),and 23.poly(dioxanone).
ε
O
OH
CH
2
OH
-
O
OH
COOH
OH
CH
2
OSO
3
H
O
O
O
O
O
O
OH
O
O
HO
HNCOCH
3
NH
2
OH
n
n
25
26
O
O
-
n
24
NH
2
HO
COOH
OH
CH
2
OH
O
O
O
O
N
O
H
N
H
N
OH
N
H
HNCOCH
3
O
O
OH
O
n
n
n
27
28
29
H
2
C
CH
2
CH
2
O
O
O
OH
OH
O
O
O
O
CH
2
OSO
3
H
OH
COOH
CH
2
OSO
3
H
O
OH
OH
OH
O
O
O
COOH
OH
n
O
O
O
CH
2
OH
OH
H
O
OH
OSO
3
H
O
OH
HNSO
3
H
OH
HNSO
3
H
n
OH
31
30
(C)
(C) Natural polymers: 24. alginate, 25. chindroitin-6-sulfate, 26. chitosan,
27. hyarunonan, 28. collagen, 29. polylysine, 30. dextran and 31. heparin.
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