The Optimized Fabrication of Nanobubbles as Ultrasound Contrast Agents for Tumor Imaging

• DOI: 10.1038/srep13725
• Publication Date: 2015-09-03T08:56:38Z
• Authors: Wen Bin Cai; Heng Li Yang; Jian Zhang; Ji Kai Yin; Yi Lin Yang; Li Jun Yuan; Li Zhang; Yun You Duan
• Keywords: 0303 health sciences; Microbubbles; Drug Compounding; Contrast Media; Mice, Nude; Reproducibility of Results; Breast Neoplasms; Image Enhancement; Sensitivity and Specificity; Article; Mice; 03 medical and health sciences; Cell Line, Tumor; Animals; Humans; Nanoparticles; Particle Size; Ultrasonography

AbstractNanobubbles, which have the potential for ultrasonic targeted imaging and treatment in tumors, have been a research focus in recent years. With the current methods, however, the prepared uniformly sized nanobubbles either undergo post-formulation manipulation, such as centrifugation, after the mixture of microbubbles and nanobubbles, or require the addition of amphiphilic surfactants. These processes influence the nanobubble stability, possibly create material waste and complicate the preparation process. In the present work, we directly prepared uniformly sized nanobubbles by modulating the thickness of a phospholipid film without the purification processes or the addition of amphiphilic surfactants. The fabricated nanobubbles from the optimal phospholipid film thickness exhibited optimal physical characteristics, such as uniform bubble size, good stability and low toxicity. We also evaluated the enhanced imaging ability of the nanobubbles both in vitro and in vivo. The in vivo enhancement intensity in the tumor was stronger than that of SonoVue after injection (UCA; 2 min: 162.47 ± 8.94 dB vs. 132.11 ± 5.16 dB, P < 0.01; 5 min: 128.38.47 ± 5.06 dB vs. 68.24 ± 2.07 dB, P < 0.01). Thus, the optimal phospholipid film thickness can lead to nanobubbles that are effective for tumor imaging.