The method 1, wherein the free radical depolymerization is carried out by adding to the native EPS a solution of an oxidizing agent selected from the group consisting of peroxides and peracides, in the presence of a metal catalyst selected from {HEAD ~ the group} consisting of Cu2+, {TAIL ~ Fe2+}, Cr3+ and Cr2O7 2− 
The method 1 , wherein the free radical depolymerization is carried out by adding to the native EPS a solution of an oxidizing agent selected from the group consisting of peroxides and peracides , in the presence of a metal catalyst selected from { HEAD ~ the group } consisting of Cu2 + , { TAIL ~ Fe2 + } , Cr3 + and Cr2O7 2−
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