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1. chinaXiv:201605.01418 [pdf]

Linear-dendrimer type methoxy-poly (ethylene glycol)-b-poly (epsilon-caprolactone) copolymer micelles for the delivery of curcumin

Song, Zhimei; Zhu, Wenxia; Yang, Fengying; Liu, Na; Feng, Runliang; Zhu, Wenxia; Song, Jiarong; Wei, Peng
Subjects: Biology >> Biophysics

Purpose: To improve curcumin's pharmacokinetic, in vitro cytotoxicity and release property. Methods: A novel linear-dendrimer methoxy-poly (ethylene glycol)-b-poly (epsilon-caprolactone) copolymer was synthesized through O-alkylation, basic hydrolysis and ring-opening polymerization reaction with methoxy-poly (ethylene glycol), epichlorohydrin and epsilon-caprolactone as raw materials. Its structure was characterized by 1 H-NMR and GPC. The copolymer's hemolysis and micellar encapsulation for curcumin by thin-film hydration were studied. Curcumin-loaded micelles were evaluated by use of in vitro release, FT-IR and X-ray diffraction. Curcumin-loaded micelles' in vitro cytotoxic activities against Hela and HT-29 cells were done, and its pharmacokinetic parameters were also carried out. Results: Curcumin was encapsulated into the micelles with 92.54% of entrapment efficiency and 12.84% of drug loading in amorphous forms. The dissolubility of nanoparticulate curcumin was 1.70 x 10(5) times higher than that of curcumin in water. The obtained copolymer showed no hemolysis. In vitro drug release study indicated that, in all cases, the kinetics was adjusted well to the Makoid-Banakar model (R-abj(2) = 0.9984). In addition, data were analyzed by the Korsmeyer-Peppas model, n values were 0.43, indicating that the drug release was accomplished by the combination diffusion and polymer chain relaxation. The cytotoxicity experiment indicated that the nanoparticulate curcumin kept up its potent anti-cancer activities. The pharmacokinetic results showed that the MRT0-infinity, t(1/2z) and AUC(0-infinity) of Curcumin-loaded micelles were 1.64, 6.54 and 4.67 times higher than that of CUR control solution. Conclusions: The copolymeric micelles loading curcumin might act as a delivery vehicle for CUR.

submitted time 2016-05-12 Hits430Downloads269 Comment 0

2. chinaXiv:201605.01320 [pdf]

Y-shaped biotin-conjugated poly (ethylene glycol)-poly (epsilon-caprolactone) copolymer for the targeted delivery of curcumin

Zhu, Wenxia; Teng, Fangfang; Zhu, Wenxia; Teng, Fangfang; Song, Zhimei; Meng, Ning; Yang, Fengying; Liu, Na; Feng, Runliang; Wei, Peng
Subjects: Biology >> Biophysics

In order to improve curcumin's low water-solubility and selective delivery to cancer, we reported ligand-mediated micelles based on a Y-shaped biotin-poly (ethylene glycol)-poly (epsilon-caprolactone)(2) (biotin-PEG-PCL2) copolymer. Its structure was characterized by H-1 NMR. The blank and drug-loaded micelles obtained by way of thin-film hydration were characterized by dynamic light scattering, X-ray diffraction, infrared spectroscopy and hemolytic test. Curcumin was loaded into micelles with a high encapsulating efficiency (93.83%). Curcumin's water-solubility was enhanced 170,400 times higher than free curcumin. Biotin-PEG-PCL2 micelles showed slower drug release in vitro than H2N-PEG-PCL2 micelles. In vitro cellular uptake and cytotoxicity tests showed that higher dosage of curcumin might overcome the effect of slow release on cytotoxicities because of its higher uptake induced by biotin, resulting in higher anticancer activities against MDA-MB-436 cells. In brief, Y-shaped biotin-PEG-PCL2 is a promising delivery carrier for anticancer drug. (C) 2014 Elsevier Inc. All rights reserved.

submitted time 2016-05-11 Hits260Downloads178 Comment 0

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