Expanding 3D geometry for enhanced on-chip microbubble production and single step formation of liposome modified microbubbles

Sally A. Peyman, Radwa H. Abou-Saleh, James R. McLaughlan, Nicola Ingram, Benjamin R. G. Johnson, Kevin Critchley, Steven Freear, J. Anthony Evans, Alexander F. Markham, P. Louise Coletta, Stephen D. Evans*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Micron sized, lipid stabilized bubbles of gas are of interest as contrast agents for ultra-sound (US) imaging and increasingly as delivery vehicles for targeted, triggered, therapeutic delivery. Microfluidics provides a reproducible means for microbubble production and surface functionalisation. In this study, microbubbles are generated on chip using flow-focussing microfluidic devices that combine streams of gas and liquid through a nozzle a few microns wide and then subjecting the two phases to a downstream pressure drop. While microfluidics has successfully demonstrated the generation of monodisperse bubble populations, these approaches inherently produce low bubble counts. We introduce a new micro-spray flow regime that generates consistently high bubble concentrations that are more clinically relevant compared to traditional monodisperse bubble populations. Final bubble concentrations produced by the micro-spray regime were up to 1010 bubbles mL−1. The technique is shown to be highly reproducible and by using multiplexed chip arrays, the time taken to produce one millilitre of sample containing 1010 bubbles mL−1 was ∼10 min. Further, we also demonstrate that it is possible to attach liposomes, loaded with quantum dots (QDs) or fluorescein, in a single step during MBs formation.
Original languageEnglish
Pages (from-to)4544-4552
Number of pages9
JournalLab on a Chip
Volume12
Issue number21
DOIs
Publication statusPublished - 7 Nov 2012

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • General Chemistry
  • Biomedical Engineering

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