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Effect of high-intensity ultrasound treatment (20 kHz at 400 W for 0, 5, 20, 40 min) on the SEM micrographs of lyophilized CSPI and DGH. (A) CSPI-0 min, (B) CSPI-5 min, (C) CSPI-20 min, (D) CSPI-40 min; (E) DGH-0 min, (F) DGH-5 min, (G) DGH-20 min, (H) DGH-40 min.
