Stable Thermally-Modulated Nanodroplet Ultrasound Contrast Agents.
biosensor
contrast agent
nanodroplet
nanoemulsion
nanotechnology
perfluorocarbon
phase-shift
thermally-responsive
ultrasound
Journal
Nanomaterials (Basel, Switzerland)
ISSN: 2079-4991
Titre abrégé: Nanomaterials (Basel)
Pays: Switzerland
ID NLM: 101610216
Informations de publication
Date de publication:
29 Aug 2021
29 Aug 2021
Historique:
received:
02
07
2021
revised:
22
08
2021
accepted:
25
08
2021
entrez:
28
9
2021
pubmed:
29
9
2021
medline:
29
9
2021
Statut:
epublish
Résumé
Liquid perfluorocarbon-based nanodroplets are stable enough to be used in extravascular imaging, but provide limited contrast enhancement due to their small size, incompressible core, and small acoustic impedance mismatch with biological fluids. Here we show a novel approach to overcoming this limitation by using a heating-cooling cycle, which we will refer to as thermal modulation (TM), to induce echogenicity of otherwise stable but poorly echogenic nanodroplets without triggering a transient phase shift. We apply thermal modulation to high-boiling point tetradecafluorohexane (TDFH) nanodroplets stabilized with a bovine serum albumin (BSA) shell. BSA-TDFH nanodroplets with an average diameter under 300 nanometers showed an 11.9 ± 5.4 mean fold increase in echogenicity on the B-mode and a 13.9 ± 6.9 increase on the nonlinear contrast (NLC) mode after thermal modulation. Once activated, the particles maintained their enhanced echogenicity (
Identifiants
pubmed: 34578541
pii: nano11092225
doi: 10.3390/nano11092225
pmc: PMC8469504
pii:
doi:
Types de publication
Journal Article
Langues
eng
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