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技術文章

測量應用案例-20211005

閱讀:144          發布時間:2021-11-16
 

文獻名: Phospholipid bilayer responses to ultrasound-induced microbubble cavitation phenomena

 

 

作者 Martin P.Walsha, Rohan V.Tikekarb, Nitin Nitinc, Steven Wrenna

aDepartment of Chemical and Biological Engineering, Drexel University, Philadelphia, PA, 19104, USA

bDepartment of Nutrition and Food Science, University of Maryland, College Park, MD, 20740, USA

cDepartment of Food Science and Technology, University of California, Davis, CA, 95616, USA

 

 

 

摘要:Using liposomal bilayers as a model for bacterial cell membranes, this study investigates the extents to which high-frequency (1.0 and 3.3 MHz) ultrasound-induced microbubble cavitation phenomena are effective for bacterial inactivation. Förster Resonance Energy Transfer (FRET), acoustic scattering and a mathematical model were used to quantify the proximity of microbubbles to liposomes, establish if liposomes affect microbubble cavitation and propose bilayer alterations' mechanisms. Addition of a positive charge on microbubbles increased their proximity to liposomes through electrostatic attraction, however, dampened microbubble's oscillation compared to freely-floating microbubbles. Alleviation of energy transfer due to phospholipid mixing between microbubbles and liposomes established that close-proximity is necessary for bilayer alterations. Approximately 19% mixing of phospholipids was observed at 3.3 MHz due to microstreaming from stable cavitation, while inertial cavitation at 1.0 MHz increased this mixing to 50%. This method can damage bacterial membrane; but, whether bacterial defense mechanisms can attenuate this effect remains to be understood.

 

關鍵詞:Ultrasound; Microbubble; Cavitation; Sonoporation; Electrostatic interaction; Liposome

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