Control of aggregation temperatures in mixed and blended cytocompatible thermoresponsive block co-polymer nanoparticles

Foralosso, Ruggero and Moir, Lee and Mastrotto, Francesca and Sasso, Luana and Tchoryk, Aleksandra and Abouselo, Amjad and Grabowska, Anna M. and Ashford, Marianne B. and Aylott, Jonathan W. and Gellert, Paul R. and Spain, Sebastian G. and Alexander, Cameron (2017) Control of aggregation temperatures in mixed and blended cytocompatible thermoresponsive block co-polymer nanoparticles. Soft Matter . ISSN 1744-6848

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under Licence Creative Commons Attribution.
Download (4MB) | Preview

Abstract

A small library of thermoresponsive amphiphilic copolymers based on polylactide-block-poly((2-(2-methoxyethoxy)ethyl methacrylate)-co-(oligoethylene glycol methacrylate)) (PLA-b-P(DEGMA)-co-(OEGMA)), was synthesised by copper-mediated controlled radical polymerisation (CRP) with increasing ratios of OEGMA:DEGMA. These polymers were combined in two ways to form nanoparticles with controllable thermal transition temperatures as measured by particle aggregation. The first technique involved the blending of two (PLA-b-P(DEGMA)-co-(OEGMA)) polymers together prior to assembling NPs. The second method involved mixing pre-formed nanoparticles of single (PLA-b-P(DEGMA)-co-(OEGMA)) polymers. The observed critical aggregation temperature Tt did not change in a linear relationship with the ratios of each copolymer either in the nanoparticles blended from different copolymers or in the mitures of pre-formed nanoparticles. However, where co-polymer mixtures were based on (OEG)9MA ratios within 5-10 mole% , a linear relationship between (OEG)9MA composition in the blends and Tt was obtained. The data suggest that OEGMA-based copolymers are tunable over a wide temperature range given suitable co-monomer content in the linear polymers or nanoparticles. Moreover, the thermal transitions of the nanoparticles were reversible and repeatable, with the cloud point curves being essentially invariant across at least three heating and cooling cycles, and a selected nanoparticle formulation was found to be readily endocytosed in representative cancer cells and fibroblasts.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Cancer and Stem Cells
University of Nottingham, UK > Faculty of Science > School of Pharmacy
Identification Number: 10.1039/c7sm00920h
Depositing User: Eprints, Support
Date Deposited: 11 Aug 2017 09:39
Last Modified: 18 Oct 2017 17:55
URI: http://eprints.nottingham.ac.uk/id/eprint/44849

Actions (Archive Staff Only)

Edit View Edit View