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The production of biodegradable and biocompatible poly-l-lactide has been successfully achieved by enzymatic ring-opening polymerization of l-lactide in subcritical and supercritical 1,1,1,2-tetrafluoroethane (scR134a). Best results were obtained in scR134a at 105°C and 50bar using the thermostable lipase from Burkholderia cepacia with a maximum PLLA yield above 50%. The media at supercritical conditions...