At the present time most packaging materials are thermoplastic based on olefin polymers, for example, high
density polyethylene, low density polyethylene, polypropylene, and linear low-density polyethylene. They tended to
be superior to other kinds of materials because of their low cost, durability, light weight, and high corrosion
resistance [1,2]. Low density polyethylene (LDPE) is one of the most suitable materials applicable for agro-food
product because of its high flexibility and toughness. However, one of its major drawbacks of LDPE used in food
packaging is lack of antimicrobial property. There had been many attempts to improve this property by the addition
of various antimicrobial agents such as organic acid, inorganic gases, bacteriocins, silver metal, and others [2].
Nevertheless, the use of synthetic materials or chemicals as the antimicrobial agents in food packaging brought up
concerns amongst consumers as well as environmental issues. Natural plant extract is predominantly safe alternative
to improve antimicrobial property in food packaging such as LDPE film instead of using synthetic chemical [2-4].
Numerous natural ingredients in herbal extracts illustrated outstanding antimicrobial activity such as clove leaf oil
(CL), sweet basil oil (SB) and cinnamon bark oil (CB) [4-10]. Major constituent of these essential oils (EOs) and
their structure are shown in Table 1. Therefore, they were chosen to combine in the film to achieve antimicrobial
activity of this food packaging.