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Nano-Carriers Based on pH-Sensitive Star-Shaped Copolymers for Drug-Controlled Release

School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
Authors to whom correspondence should be addressed.
Materials 2019, 12(10), 1610;
Received: 2 April 2019 / Revised: 4 May 2019 / Accepted: 13 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Micro and Nanotechnologies in Biomedicines)
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Polymeric nano-carriers are considered as promising tools in biomedical applications due to multiple attractive characteristics including their low toxicity, high loading capacity, controlled drug release capabilities, and highly tunable chemical properties. Here, a series of pH-sensitive star-shaped copolymers, Ad-P[(EMA-co-MAA)-b-PPEGMA]4, was prepared via electron transfer atom radical polymerization (ARGETE ATRP) and selective hydrolysis. These star-shaped copolymers can be self-assembled into micelles (Dh = 150–160 nm) and their critical micelle concentrations (CMC) were estimated to be 3.9–5.0 mg/L. The pH-sensitiveness of the micelles was evidenced by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The maximal paclitaxel (PTX) loading efficiency (DLC) and entrapment efficiency (EE) were 18.9% and 36%, respectively. In vitro release studies revealed that about 19% of the PTX released at an acidic condition of pH 1.2 over 70 h, whereas more than 70% was released within the same time interval at pH 6.8. In vitro cytotoxicity suggested that the low cytotoxicity of the blank micelles, while the PTX-loaded micelles providing the cytotoxicity close to that of free PTX. These results indicated that this novel pH-sensitive nano-carriers have great potential applications for oral drug-controlled release. View Full-Text
Keywords: nano-carrier; pH-sensitive copolymer; drug release; adamantane nano-carrier; pH-sensitive copolymer; drug release; adamantane

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Jiang, W.; Guo, J.; Wen, W.; Jia, Y.-G.; Liu, S. Nano-Carriers Based on pH-Sensitive Star-Shaped Copolymers for Drug-Controlled Release. Materials 2019, 12, 1610.

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