Figure 2.

Size determination of NP-FePO₄ (200) during different stages of in vitro digestion. 1 mg/mL stock solutions in water were diluted to 30 µg/mL in digestion solutions, and visualised using TEM. Particle sizes were calculated using ImageJ software analysis (A) and particle size distributions reflected in the table (B). Representative TEM micrographs used in the analysis of size and size distributions at pH 2, t = 0 min (C), pH 2, t = 60 min (D), and pH 7, t = 30 min (E). Histogram of particle distribution based upon total particle population during stages of in vitro digestion (F).