Enhanced drug-loading and therapeutic efficacy of hydrotropic oligomer-conjugated glycol chitosan nanoparticles for tumor-targeted paclitaxel delivery

Heebeom Koo, Kyung Hyun Min, Sang Cheon Lee, Jae Hyung Park, Kinam Park, Seo Young Jeong, Kuiwon Choi, Ick Chan Kwon, Kwangmeyung Kim

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81 Citations (Scopus)


Enhanced drug-loading and therapeutic efficacies are highly essential properties for nanoparticles as tumor-targeting drug carriers. Herein, we developed the glycol chitosan nanoparticles with hydrotropic oligomers (HO-CNPs) as a new tumor targeting drug delivery system. For enhancing drug-loading efficiency of paclitaxel in drug carriers, hydrotropic 2-(4-(vinylbenzyloxy)-N, N-diethylnicotinamide) (VBODENA-COOH) oligomers, that were used for enhancing the aqueous solubility of paclitaxel, were directly conjugated to glycol chitosan polymers. The amphiphilic conjugates readily formed nanoparticle structure (average size = 302 ± 22 nm) in aqueous condition. Water-insoluble paclitaxel (PTX) was readily encapsulated into HO-CNPs with a high drug-loading amount up to 24.2 wt.% (2.4 fold higher than other polymeric nanoparticles) by a simple dialysis method. The PTX encapsulated HO-CNPs (PTX-HO-CNPs; average size = 343 ± 12 nm) were very stable in aqueous media up to 50 days. Also, PTX-HO-CNPs presented rapid cellular uptake and lower cytotoxicity in cell culture system, compared to Cremophor EL/ethanol formulation of PTX. In tumor-bearing mice, the extravasation and accumulation of PTX-HO-CNPs in tumor tissue were precisely observed by intravital fluorescence imaging techniques. Furthermore, PTX-HO-CNPs showed the higher therapeutic efficacy, compared to Abraxane®, a commercialized PTX-formulation. These overall results demonstrate its potential as a new nano-sized PTX carrier for cancer treatment.

Original languageEnglish
Pages (from-to)823-831
Number of pages9
JournalJournal of Controlled Release
Issue number3
Publication statusPublished - 2013 Nov 13



  • Cancer therapy
  • Drug delivery
  • Glycol chitosan nanoparticles
  • Hydrotropic oligomer
  • Paclitaxel
  • Tumor-targeting

ASJC Scopus subject areas

  • Pharmaceutical Science

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