期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 7, 页码 5793-5802出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15005
关键词
hyperbranched polymers; thermo-sensitivity; pH sensitivity; coacervate forming; selective cell binding
资金
- Science Foundation Ireland (SFI) Industry Fellowship [15/IFA/3037]
- SFI Principal Investigator Program [13/IA/1962]
- Health Research Board of Ireland [HRA-POR-2013-412]
- [12/IP/1688]
- Science Foundation Ireland (SFI) [15/IFA/3037, 13/IA/1962] Funding Source: Science Foundation Ireland (SFI)
We report a new type of thermo- and pH-responsive, coacervate-forming highly degradable polymer-hyperbranched poly(beta-amino esters) (HPAEs) and its selective cell binding behaviors. The HPAEs were synthesized from 5-amino-1-pentanol (SS) and trimethylolpropane ethoxylate triacrylate (TMPETA) via an A2+B3 type Michael addition. The existence of multiple hydrogen bond pairs as well as tertiary amines makes the S5-TMPETA polymers manifest temperature- and pH-dependent phase transition. By varying the length of the ethylene glycol (EG) spacers in the TMPETA, polymer molecular weight, concentration, and pH value, the phase transition of the S5-TMPETA can be easily tuned in aqueous and buffer solutions, as evidenced by UV vis spectroscopy and DLS measurements. Especially, the S5-TMPETA prepared from SS and trimethylolpropane ethoxylate triacrylate 692 (S5-TMPETA692) shows a lower critical solution temperature (LCST) around 33 degrees C, above which the S5-TMPTEA can form coacervate particles able to encapsulate functional molecules effectively. Importantly, when incubation with HeLa cells, the S5-TMPTETA692 exhibits a temperature- and pH-responsive selective cell binding behaviors. In addition, the S5-TMPETA are highly hydrolyzable and elicit negligible cytotoxicity. This new type of smart polymer should find use in a variety of biomedical applications.
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