*3.2. Capsule Morphology*

SEM images demonstrated the ability of HDPAF to form capsules when HDPAF concentrations between 10% and 50% (*w*/*w*) were used as shown in Figure 1. Nanocapsules with spherical morphology and sizes between 650 nm and 760 nm, without cracks, dents or deformations and without being agglomerated (Figure 1) were obtained. The absence of pores or cracks on the capsule surface is important to ensure low oxygen permeability which could lead to the degradation of the encapsulated antioxidant compounds [24]. However, Ortiz-Basurto et al. [6] observed an irregular surface and several indentations on the microparticles of HDPAF encapsulating pitanga juice obtained by spray drying.

**Figure 1.** Micrographs obtained by scanning electron microscopy (SEM) of HDPAF nanocapsules at different HDPAF concentrations (% *w*/*w*: 10, 20, 30, 40 and 50) obtained by electrospraying.
