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Dual-responsive semi-IPN copolymer nanogels based on poly (itaconic acid) and hydroxypropyl cellulose as a carrier for controlled drug release

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Abstract

Dual-responsive nanogels were prepared by polymerization of itaconic acid (IA) and copolymerization with methacrylic acid (MA) in aqueous solution of hydroxypropyl cellulose (HPC) and cross-linking with N, N′-methylenebisacrylamide (MBAm) through an easy and green process. FTIR spectroscopy, TEM, AFM, DLS and zeta potential studies confirmed the semi-interpenetrating (semi-IPN) polymer network structure of nanogels. The LCST of HPC was increased to a higher temperature than HPC’s intrinsic LCST, while the presence of the MA comonomer improved the hydrophobicity of the copolymer and reduced LCST to about body temperature and suppressed the excessive nanogel aggregation. It was found that the concentration of reactants impacted the process of nanogel formation. Additionally, an increasing of cross-linker concentration led to a reduced size of HPC nanogels. Besides, the diameter of nanogels was changed with the temperature and pH. TEM and AFM photographs of copolymer nanogels illustrated that the nanoparticles with small diameters (<100 nm) were prepared. With loading the doxorubicin into the copolymer nanogels, the particle size became larger (about 150 nm) and due to the electrostatic interaction of the cationic drug with anionic particles, the zeta potential was increased. Drug release processes were followed at pH = 5.0 and 7.4 and with 37- and 41-°C temperatures, respectively. The maximum in-vitro release studies of drug-loaded nanogels, which is 91% for the pH 5.0 buffer solution at 41 °C, demonstrated the temperature- and pH-sensitivity of prepared copolymer nanogels.

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Acknowledgements

We thank the Vice Chancellor of Research of Azarbaijan Shahid Madani University for financially supporting this research.

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Authors and Affiliations

  1. Chemistry Department, Science Faculty, Azarbaijan Shahid Madani University, P.O. Box: 53714-161, Tabriz, 5375171379, Iran

    Soraya Hassanpour & Massoumeh Bagheri

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  1. Soraya Hassanpour
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  2. Massoumeh Bagheri
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Correspondence to Massoumeh Bagheri.

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Hassanpour, S., Bagheri, M. Dual-responsive semi-IPN copolymer nanogels based on poly (itaconic acid) and hydroxypropyl cellulose as a carrier for controlled drug release. J Polym Res 24, 91 (2017). https://doi.org/10.1007/s10965-017-1246-z

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