The weight losses of PLA blend films were determined, as shown in Fig. 2. The PLA blend films from
Lecitase Ultra and Lipozyme TL IM as biocatalysts, deteriorated as a function of degradation time.
Different ratios directly affected on degradable behavior, the PLA products resulted from either Lecitase
Ultra or Lipozyme TL IM blended with the commercial PLA beads showed the highest weight loss
initially during soil burial experiment. Then, their weight losses decreased slowly until the 8 days of soil
burial time and increased again after 8 days of soil burial condition. This result was observed that there
was water removal from the structure of PLA blend film at the initial of soil burial condition until kept
constantly. Then after 8 days, there was degradation of the structure of film further. Interestingly, these
were greater than that obtained from only commercial PLA film (PLA com). Due to the higher molecular
weight of commercial PLA film which affect to the structures were stronger than PLA blend film.
Therefore, there was the degradable behavior of commercial PLA film less than PLA blend film in short
times. For a pure synthesized PLA, could not be casted for PLA film due to its low molecular weight.