HPLC conditions for assay of PP in spray-dried powder were HiQ sil C18HS column (250 x 4.6 mm x 5 μm); column temperature of 30 oC; wavelength of 268 nm; mobile phase containing ACN 100%; flow rate of 1mL / min; injection volume of 20 μL; this method met requirements of system suitability, repeatability, linearity and accuracy.