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The effect of cisplatin on the nanoscale structure of aqueous PEO-PPO-PEO micelles of varying hydrophilicity observed using SAXS

Abstract

Aqueous solutions of polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) copolymers form micelles and cubic lattices as their temperature is raised. The presence of added solutes within the dispersions can also affect the kinetics of structure formation. Here, we investigate the structures formed in the amphiphiles P104, P105, and F108 solutions at 31% mass/v both neat and co-formulated with the drug cisplatin (0.02% to 0.1% mass/v) using small-angle X-ray scattering. P104 formed BCC colloidal crystals while P105 and F108 formed FCC structures. Cisplatin had a minor influence of the formation and stability of the crystals during these thermal excursions. The largest interaction between the amphiphiles and cisplatin was with P104 where there was a 2% reduction in the BCC lattice parameter of P104 as cisplatin loading rose from 0-0.1% at 28oC. The F108 unit cell swelled ~2% due to cisplatin loading of 0.1% at 28oC. A progressive evolution and breakdown of these structures was noted as temperature rose from 10oC to 35oC. For the different amphiphiles, crystal thermal expansion coefficients of ~1x10-2/oC were determined in neat and loaded amphiphiles with cisplatin and all the crystals swelled with increasing temperature.

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Publication details

The article was received on 11 Jan 2019, accepted on 15 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9SM00071B
Citation: Soft Matter, 2019, Accepted Manuscript

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    The effect of cisplatin on the nanoscale structure of aqueous PEO-PPO-PEO micelles of varying hydrophilicity observed using SAXS

    A. L. Thompson, L. Mensah and B. Love, Soft Matter, 2019, Accepted Manuscript , DOI: 10.1039/C9SM00071B

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