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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Studies on chitosan-g-polyethyleneimine copolymer as drug carriers for PolyI:C

Kai Zhang A , Qian Sun A , Peng Liu A , Xiaoyu Bai A , Xingtong Gao A , Kai Liu A , Aixiang Li https://orcid.org/0000-0001-9271-5537 A * , Zijian LYu A and Qiuhong Li A
+ Author Affiliations
- Author Affiliations

A School of Material Science and Engineering, Shandong University of Technology, Zibo, 255049, People’s Republic of China.

* Correspondence to: axl@sdut.edu.cn

Handling Editor: Charlotte Conn

Australian Journal of Chemistry 75(7) 467-476 https://doi.org/10.1071/CH22076
Submitted: 4 April 2022  Accepted: 27 June 2022   Published: 11 August 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

PolyI:C is an immunomodulatory agent that can be used in immunotherapy, but its transportation in the body is hindered. In this study, a chitosan (CS)-graft-polyethyleneimine (PEI) copolymer (C-g-P) is prepared by an N,N′-carbonyl diimidazole (CDI) coupling method as a drug carrier for PolyI:C and simulated antigen ovalbumin (OVA). The results of FT-IR, 1H NMR, elemental analysis and cytotoxicity studies show that PEI is successfully grafted onto CS, and a low cytotoxicity of C-g-P-x (x = 1, 2, 3) with different PEI grafting rates are obtained. C-g-P-x-PolyI:C/OVA (C-g-P-x-PO) (x = 1, 2, 3) nanoparticles are prepared by combining C-g-P-x (x = 1, 2, 3), PolyI:C and OVA by electrostatic self-assembly. The results of agarose gel electrophoresis show that PolyI:C is well coated by the graft copolymer and protected from nuclease degradation. The results show that C-g-P-1-PO nanoparticles with graft copolymer to PolyI:C (N/P) ratios of 80:1 have the best solution stability, and the OVA encapsulation efficiency is 60.6%. The nanoparticles also have a suitable size and regular shape to be absorbed by cells. In vitro immunoassay results show that PolyI:C and OVA-loaded nanoparticles promote the secretion of tumor necrosis factor α (TNF-α) and interferon γ (IFN-γ). CS-g-PEI is a reliable drug carrier for the delivery of PolyI:C and OVA, and it also provides the possibility to carry other drugs.

Keywords: chitosan, copolymerization, CS-graft-PEI copolymer, drug delivery, electrostatic interactions, nanochemistry and supramolecular chemistry, PolyI:C, self-assembly.


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