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Ultrasound-enhanced (1 MHz, CW, 2 W/cm2, 5 min), pH-triggered release from POPC liposomes encapsulating 400 mM ammonium bicarbonate at pH = 6.0 (A) and pH = 5.0 (B). The release values at a pH of 7.4 are included as the controls. Violet bars: release after 20 min with ultrasound application. Orange bars: release after 2 h with ultrasound application (n = 3).
