Optimization Conditions of Ultrasound-Assisted Extraction for Phenolic Compounds and Antioxidant Activity from Rubus alceifolius Poir Leaves

Figure 4

SEM images (×1,000) of (a) native, (b) at optimal UAE (320 W, 39.79°C, 35.32 min.), (c) extremely UAE (500 W, 60°C, and 55 min), (d) SE method, and (e) ME method.

(a)

(b)

(c)

(d)

(e)