The analytical method was reproduced from and based on a three solvent exchange process: water/methanol/DMAc. The chromatographic system was from Malvern company, using the data collection software OmniSEC. Dual angle laser light scattering detectors Viscotek 270 (RALS/LALS) were coupled with a Viscotek VE 3580 Refractive Index (RI) detector. Two PL gel Mixed-A LS (20 µm porosity, 300x7.5mm) columns preceded by a guard column (10 µm porosity, 50x7.5mm) from Agilent were used as stationary phase. SEC chromatograms were smoothed (Savitsky-Golay) with SciDAVis. Where x is Log(M), k n the degree of Gaussian or Lorentzian profile of peak n (0<k n <1), Am n the amplitude of peak n, w n the full width at half maximum of the peak n, xc n the Log(M) value of the centre of peak n.