Keywords: زمان آرام سازی شبکه ی اسپین; DMPC; dimyristoylphosphatidylcholine; DSC; differential scanning calorimetry; egg PC; egg yolk phosphatidylcholine; ÎH; enthalpy variation; FTIR; Fourier transform infrared spectroscopy; HATR-FTIR; horizontal attenuated total reflectance-Fourier tran