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      Oxidation and pH responsive nanoparticles based on ferrocene-modified chitosan oligosaccharide for 5-fluorouracil delivery.

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          Abstract

          Stimuli-responsive nanoparticles based on biodegradable and biocompatible saccharides are potentially superior carriers under different physical conditions. In this study, we present a detailed investigation on the oxidation and pH responses of ferrocene-modified chitosan oligosaccharide (FcCOS) nanoparticles for 5-Fluorouracil (5-FU) Delivery. The dispersion of FcCOS nanoparticles depends strongly on pH change. NaClO, H2O2 and oxygen, as oxidant models, in a weak acid solution displayed varying accelerations as the disassembly progressed. 5-FU, as a drug model, is efficiently uploaded in FcCOS nanoparticle (approximately 238 nm). The in vitro release of 5-FU from FcCOS nanoparticles studies show that the accumulative release increased with the decrease of pH under bubbled N2. Interestingly, the sample under bubbled air has a higher accumulative release up to 59.64% at pH 3.8, compared with samples under bubbled N2 just 49.02%. The results suggested that FcCOS nanoparticles disassembled faster and the release of drug molecules was accelerated because of the synergistic effect of oxidative agent and low pH. Thus, FcCOS can be developed as an effective pH and oxidation dual-responsive carrier to enhance drug efficacy for cancer treatment.

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          Author and article information

          Journal
          Carbohydr Polym
          Carbohydrate polymers
          Elsevier BV
          1879-1344
          0144-8617
          Dec 19 2014
          : 114
          Affiliations
          [1 ] School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
          [2 ] School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: wang-caiqi@ucas.ac.cn.
          S0144-8617(14)00754-1
          10.1016/j.carbpol.2014.08.003
          25263860

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