Research Article

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

Figure 2

The normal probability plot of the studentized residuals for (a) total phenolic content (TPC) and (b) antioxidant capacity (ABTS radical scavenging activity) of the R.A. Poir extract.
(a)
(b)