Essential oil was initially used in Egypt, India and Persia more
than 2000 years ago. Its antimicrobial inhibitory was discovered
around a century ago [12]. Nowadays, many types of essential oils
were used as antimicrobial agent in food packaging materials. The
essential oil extracted from cinnamon was used as an antimicrobial
agent in poly(ethylene terephthalate) (PET) film. It was found that
the active PET showed the inhibition of Aspergillus flavus growth
[13]. After incorporated to poly(lactic acid) (PLA)/poly(trimethylene
carbonate) (PTMC) film, thymol was found to inhibit the growth of
Escherichia coli, Staphylococcus aureus, Listeria, Bacillus subtilis, and
Salmonella [14].