PLA incorporated with different substances such us nisin silver nanoparticles alpha-tocopherol, BHT or polyethylene glycol (Byun, Kim, &Whiteside, 2010) have been developed in order to improve antimicrobial
or antioxidant properties of food packaging with the aim
of increasing the length of time that perishable products remain
useful. However, the incorporation of natural extracts is less
widespread. Film casting method is frequently used to incorporate
natural extracts into PLA; however, this method it is normally not
feasible for commercial film production