Influence of lipid shell physicochemical properties on ultrasound-induced microbubble destruction

Mark A. Borden, Dustin E. Kruse, Charles F. Caskey, Shukui Zhao, Paul A. Dayton, Katherine W. Ferrara

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

We present the first study of the effects of monolayer shell physicochemical properties on the destruction of lipld-coated mi crobubbles during insoniflcation with single, one-cycle pulses at 2.25 MHz and low-duty cycles. Shell cohesiveness was changed by varying phospholipid and emulsifier composition, and shell microstructure was controlled by postproduction processing. Individual microbubbles with initial resting diameters between 1 and 10 μm were Isolated and recorded during pulsing with bright-field and fluorescence video microscopy. Microbubble destruction occurred through two modes: acoustic dissolution at 400 and 600 kPa and fragmentation at 800 kPa peak negative pressure. Lipid composition significantly impacted the acoustic dissolution rate, fragmentation propensity, and mechanism of excess lipid shedding. Less cohesive shells resulted in micron-scale or smaller particles of excess lipid material that shed either spontaneously or on the next pulse. Conversely, more cohesive shells resulted in the buildup of shell-associated lipid strands and globular aggregates of several microns in size; the latter showed a significant increase in total shell surface area and lability. Lipid-coated microbubbles were observed to reach a stable size over many pulses at intermediate acoustic pressures. Observations of shell microstructure between pulses allowed interpretation of the state of the shell during oscillation. We briefly discuss the implications of these results for therapeutic and diagnostic applications involving lipid-coated microbubbles as ultrasound contrast agents and drug/gene delivery vehicles.

Original languageEnglish (US)
Pages (from-to)1992-2002
Number of pages11
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume52
Issue number11
DOIs
StatePublished - Nov 2005

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Lipids
destruction
lipids
Ultrasonics
pulses
acoustics
fragmentation
dissolving
Dissolution
Acoustics
sheds
microstructure
Microstructure
cycles
Phospholipids
Chemical analysis
genes
strands
Monolayers
delivery

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

Cite this

Influence of lipid shell physicochemical properties on ultrasound-induced microbubble destruction. / Borden, Mark A.; Kruse, Dustin E.; Caskey, Charles F.; Zhao, Shukui; Dayton, Paul A.; Ferrara, Katherine W.

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 52, No. 11, 11.2005, p. 1992-2002.

Research output: Contribution to journalArticle

Borden, Mark A. ; Kruse, Dustin E. ; Caskey, Charles F. ; Zhao, Shukui ; Dayton, Paul A. ; Ferrara, Katherine W. / Influence of lipid shell physicochemical properties on ultrasound-induced microbubble destruction. In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 2005 ; Vol. 52, No. 11. pp. 1992-2002.
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