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Comb-like temperature-responsive polyhydroxyalkanoate--poly(2-dimethylamino-ethylmethacrylate) for controllable protein adsorption
Polyhydroxyalkanoates (PHA) are a family of diverse biopolyesters produced by many bacteria grown on sustainable bio-resources such as glucose or fatty acids. A PHA copolymer P(3HDD- co -3H9D) consisting of 3-hydroxydodecanoate (3HDD) and 3-hydroxy-9-decenoate (3H9D) was synthesized by the engineere...
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Published in: | Polymer chemistry 2016-09, Vol.7 (38), p.5957-5965 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | Polyhydroxyalkanoates (PHA) are a family of diverse biopolyesters produced by many bacteria grown on sustainable bio-resources such as glucose or fatty acids. A PHA copolymer P(3HDD-
co
-3H9D) consisting of 3-hydroxydodecanoate (3HDD) and 3-hydroxy-9-decenoate (3H9D) was synthesized by the engineered bacterium
Pseudomonas entomophila
. The PHA was used to generate a comb-like temperature-responsive graft polymer P(3HDD-
co
-3H9D)-
g
-poly(2-dimethylamino-ethylmethacrylate), abbreviated as (PHA-
g
-PDMAEMA),
via
a three-step reaction developed for this study. Uniform "side chain" PDMAEMA oligomers were first prepared
via
reversible addition-fragmentation chain transfer (RAFT) polymerization. Each PDMAEMA oligomer was subsequently added with a thiol group at the end of the chain
via
aminolysis. Thiol PDMAEMA was then grafted onto unsaturated P(3HDD-
co
-3H9D), with a tunable grafting density from 2.5 to 10 mol%. Graft copolymer PHA-
g
-PDMAEMA showed enhanced thermal stability, biocompatibility and controllable hydrophilicity compared with non-grafted P(3HDD-
co
-3H9D). The grafted material presented an obvious tendency of increasing protein adsorptions over the lower critical solution temperature (LCST 47.5 °C) on PHA-
g
-PDMAEMA with an increasing percentage of DMAEMA in the copolymers. At a temperature below LCST, PHA-
g
-PDMAEMA presented poor protein absorption in contrast to P(3HDD-
co
-3H9D). The temperature-responsive properties of the comb-like graft polymer PHA-
g
-PDMAEMA can be manipulated toward controllable protein adsorption for biomedical usages.
Polyhydroxyalkanoates (PHA) are a family of diverse biopolyesters produced by many bacteria grown on sustainable bio-resources such as glucose or fatty acids. |
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ISSN: | 1759-9954 1759-9962 |
DOI: | 10.1039/c6py01235c |