In the presented work the simultaneous use of ultrasound in tracking and smart release was investigated. Hybrid microparticles based on an iron core coated by a polysaccharide were prepared and loaded with doxorubicin. The possibility to trigger and control the release of the payload was demonstrated by application of ultrasound cycles at different power and time length. Results clearly indicate a direct correlation between the intensity of the release with the two parameters. A preliminary test using Sus Domestic liver demonstrates the possibility to visualize the faith of the microparticles after injection at the target site by a linear array ultrasound transducer. The dual function of the ultrasound; to visualize the position of the microparticles and afterwards trigger the release by changing the frequency was demonstrated offering a great perspective for a future biomedical application.Keywords: Ultrasound, microparticles, stimuli-responsive release, doxorubicin, iron oxide
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