Effect of Ultrasound Parameters on the Release of Liposomal Calcein
| Autor: | Tonni Franke Johansen, Rune Hansen, Mercy Afadzi, Esben A. Nilssen, Svein-Erik Måsøy, Yngve Hofstad Hansen, Catharina de Lange Davies, Oyvind K.-V. Standal, Bjorn A. J. Angelsen |
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| Rok vydání: | 2012 |
| Předmět: |
medicine.medical_specialty
Acoustics and Ultrasonics Kinetics Biophysics Ultrasound exposure Radiation Dosage Diffusion Sonication chemistry.chemical_compound medicine Radiology Nuclear Medicine and imaging Liposome Chromatography Radiological and Ultrasound Technology Chemistry business.industry Ultrasound Dose-Response Relationship Radiation Fluoresceins Surgery Calcein Delayed-Action Preparations Liposomes Drug release Hydroxide business Mechanical index |
| Zdroj: | Ultrasound in Medicine & Biology. 38:476-486 |
| ISSN: | 0301-5629 |
| DOI: | 10.1016/j.ultrasmedbio.2011.11.017 |
| Popis: | The ultrasound exposure parameters that maximize drug release from dierucoyl-phosphatidylcholine (DEPC)-based liposomes were studied using two transducers operating at 300 kHz and 1 MHz. Fluorescent calcein was used as a model drug, and the release from liposomes in solution was measured using a spectrophotometer. The release of calcein was more efficient at 300 kHz than at 1 MHz, with thresholds of peak negative pressures of 0.9 MPa and 1.9 MPa, respectively. Above this threshold, the release increased with increasing peak negative pressure, mechanical index (MI), and duty cycle. The amount of drug released followed first-order kinetics and increased with exposure time to a maximal release. To increase the release further, the MI had to be increased. The results demonstrate that the MI and the overall exposure time are the major parameters that determine the drug’s release. The drug’s release is probably due to mechanical (cavitation) rather than thermal effects, and that was also confirmed by the detection of hydroxide radicals. |
| Databáze: | OpenAIRE |
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