PTSO, the main organosulfur compound of Proallium®, was
extracted from the PLA films by immersing the films in isopropanol
in the following manner: 0.5 g of each PLA film was accurately
weighed and extracted with 10 mL of isopropanol for 24 h with
constant shaking at 100 min1
. Then, the solvent extract was
recovered and filtered through a Teflon filter of 0.22 microns.