期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 362, 期 2, 页码 584-593出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.06.079
关键词
pH; Thermo-sensitive copolymer; TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl); Micelles; Electron spin resonance (ESR)
资金
- Ministry of Science and Technology of the People's Republic of China [2010DFA44300]
- National Natural Science Foundation of China (NSFC) [21074033]
- Science and Technology Commission of Shanghai Municipality (STCSM) [10dz2220500, 09520703200]
The fabrication of a new amphiphilic block copolymer composed of a poly DL-lactic acid (PLA) hydrophobic backbone and pH dependent thermo-sensitive poly (N-isopropyl) methacrylamide-co-N-isopropylmaleamic acid-co-10-undecenoic acid (PNIPAAm-co-NIPMMA-co-UA) entities as hydrophilic domains as well as carrying 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) residues for electron spin resonance (ESR) labeling is reported. The lower critical solution temperature (LCST) of the copolymer was determined by optical absorbance measurements. The LCST was pH dependent and varied in a narrow practical range, 35.4 degrees C at pH 5.0, 37.5 degrees C at pH 6.5 and 39.4 degrees C at pH 7.4, which was below, near and above nominal physiological temperature respectively. The assembly of the copolymer into micelles in aqueous solution at temperatures below the LCST was confirmed by FT-IR, H-1 NMR and fluorescence spectroscopy. It is demonstrated that the anticancer drug, 5-fluorouracil (5-FU) can be loaded effectively within the polymeric micelles and released in response to environmental stimuli- namely, pH and temperature. Crown Copyright (C) 2011 Published by Elsevier Inc. All rights reserved.
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