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Platycodin D (PD) is the active metabolite of Platycodon grandiflorum. The main purpose of this study was to develop and evaluate a water‐in‐oil (W/O) microemulsion formulation of PD (PD‐ME). The PD‐ME was successfully prepared by the water titration method at Km = 2, to draw the pseudoternary phase diagrams. Physical characterization including the particle size, pH, refractive index, average viscosity,...
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