PLA molecular weight estimation (size exclusion chromatography). After solubilization of thePLA in tetrahydrofuran (THF, 0.2 %), a pumping system associated with an injector introduced thesample into the column at a constant and reproducible rate (THF flow rate of 1 ml.min-1, at 40 °C).Macromolecules were then detected by a refractive index detector at the exit of the column (AgilentTechnologies, PL-GPC50 Plus; TOSOH TSK, G4000HXL) using polystyrene calibration.