Microwave-Assisted Simultaneous Extraction of Luteolin and Apigenin from Tree Peony Pod and Evaluation of Its Antioxidant Activity

Figure 5

SEM images (20.0 lm, 15.0 kV) of untreated tree peony pod sample (a), sample after ME (b), sample after HRE (c), and sample after MAE (d).

(a)

(b)

(c)

(d)