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Self-assembly of Novel Poly(d,l-Lactide-co-Glycolide)-b-Poly(N-Vinylpyrrolidone) (PLGA-b-PNVP) Amphiphilic Diblock Copolymers

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Abstract

Alkyne-terminated poly(d,l-lactide-co-glycolide) (PLGA) has been synthesized via ROP at room temperature. Amphiphilic PLGA-b-poly(N-vinylpyrrolidone) (PNVP) block copolymers have been synthesized via alkyne-azide click reaction of it with azide-terminated PNVPs prepared by RAFT polymerization of NVP using an azide-terminated RAFT agent. 1H NMR and gel permeation chromatography (GPC) confirmed the formation of block copolymers. Self-assembly of these block copolymers was confirmed by fluorescence study using pyrene as a probe and supported by 1H NMR, DLS and TEM studies. Hydrophobic drug doxorubicin was successfully encapsulated at the micellar core of PLGA46-b-PNVP89 with drug-loading content (DLC) and drug-loading efficiency (DLE) of 10.8 and 43.2 %, respectively. Sustained drug release of these drug-loaded micelles was observed at both pH of 6.4 and 7.4. Faster drug release was observed at pH 6.4. Such PLGA-b-PNVP amphiphilic block copolymer may find extensive application in sustained drug delivery, specifically in antitumor drug delivery.

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Acknowledgments

Present work is supported by Department of Science Technology, New Delhi, India, under Nanomission project as well as by Department of Biotechnology (DBT), New Delhi, India, through the sanction no.BT/PR889/NNT/28/570/2011. K. Ramesh gratefully acknowledges Indian Institute of Technology (BHU), Varanasi, India, for Teaching Assistantship.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India

    K. Ramesh, Shikha Singh, Kheyanath Mitra & Biswajit Ray

  2. School of Biomedical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    K. Ramesh & Nira Misra

  3. Department of Polymer Science and Technology, University of Calcutta, 92, A. P. C. Road, Kolkata, 700 009, India

    Dipankar Chattopadhyay

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  1. K. Ramesh
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  2. Shikha Singh
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  5. Nira Misra
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Correspondence to Biswajit Ray.

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Ramesh, K., Singh, S., Mitra, K. et al. Self-assembly of Novel Poly(d,l-Lactide-co-Glycolide)-b-Poly(N-Vinylpyrrolidone) (PLGA-b-PNVP) Amphiphilic Diblock Copolymers. Colloid Polym Sci 294, 399–407 (2016). https://doi.org/10.1007/s00396-015-3795-1

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  • DOI: https://doi.org/10.1007/s00396-015-3795-1

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