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. 2019 May 18;24(10):1922. doi: 10.3390/molecules24101922

Figure 4.

Figure 4

Fluorescence spectra of native and ultrasonic-processed PPO at 20 W/mL for 5, 10, 15, 20 and 30 min (a); processed for 20 min at 10, 20, 30, 40 and 50 W/mL (b).