Stability of polymersomes prepared by size exclusion chromatography and extrusion

Julia E. Bartenstein, James Robertson, Giuseppe Battaglia, Wuge H. Briscoe

Research output: Contribution to journalArticle (Academic Journal)peer-review

19 Citations (Scopus)
302 Downloads (Pure)

Abstract

In this work, stability of poly(butadiene)-poly(ethylene oxide) (PBD-PEO) polymersomes, self-assembled from two polymers with different molecular weights (PBD32-PEO21 and PBD125-PEO80) in either pure H2O or phosphate buffered saline (PBS), is studied. Polymersome dispersions usually show large polydispersity, and it is thus desirable to separate different-sized vesicles if a narrow size distribution is required, e.g. for model systems in certain applications. This is typically achieved by extrusion through a membrane with a designated pore size or, less commonly, by size exclusion chromatography (SEC). Here, we find that both extrusion and SEC of polymersome dispersions with vesicle sizes ranging from 100–5000 nm and polydispersity index (PDI) = 1, can yield smaller vesicles with PDIs < 0.35. With SEC, it is possible to separate fractions of polymersomes with different sizes. However, the SEC polymersome size and particularly the spread in the size increase significantly over time, whereas the extruded polymersomes are shown to be more stable. We attribute this to possible dilution of the polymersome dispersion during the SEC elusion process. The effects of temperature and the PBD-PEO molecular weight on the stability of the extruded polymersomes against dilution in pure water and phosphate buffer are further studied. It is found that the polymersomes show higher stability when stored at lower temperature, undiluted, and prepared in phosphate buffer, whereas the polymer molecular weight does not have a large influence on the stability.
Original languageEnglish
Pages (from-to)739-746
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume506
Early online date25 Jul 2016
DOIs
Publication statusPublished - 5 Oct 2016

Keywords

  • Polymersomes
  • polymer vesicles
  • size exclusion chromatography

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