Fig. 1
From: Alkylated EDTA potentiates antibacterial photodynamic activity of protoporphyrin
Properties of PpIX at different concentrations. a Fluorescence intensity of PpIX at different concentrations. b Fluorescence intensity of PpIX at three representative concentrations in aqueous solutions at different pH values. c Size distribution of PpIX formed at three different concentrations (pH 10.0) measured by DLS. d SEM images of the PpIX particles. e Antibacterial activity of PpIX at the three concentrations against S. aureus after 2 h illumination; Data are presented as mean ± SD (n = 3). **P < 0.01, ****P < 0.0001