Question

Surface modification of pet film grafting with chitosan and its antifungal activity

Answer 1

Answer:

The antimicrobial coating on plasma-treated packaging polymer materials is a potential and alternative technique for extending the post-harvest life of fresh fruits and vegetables. The present work is to evaluate the shelf life of post-harvest grapes stored in different plasma (air, argon, and oxygen) treated and chitosan-coated polystyrene (PS) Petri plates at atmospheric condition (room temperature 28 °C). The plasma treatments were used to activate the inert PS film surface to enhance the adhesion of the chitosan coating. Plasma treatments on the PS film changed the chemical and morphological properties were investigated by ATR-FTIR, EDS, and FE-SEM analyses. The contact angle measurement confirms that the air, argon, and oxygen plasma treatments greatly enhanced the hydrophilicity of PS and the greater decrease was found in oxygen plasma treatment. Further, the chitosan was immobilized onto PS surface utilizing dip coating and it was characterized by the contact angle, ATR-FTIR, and FE-SEM evaluations. XPS result indicates the chitosan was efficiently immobilized on the PS film. Subsequently, the shelf lifetime and weight loss (%) was calculated for table grapes stored in the air, argon, and oxygen plasma-treated with chitosan-coated PS. The result suggests that oxygen plasma treatment along with chitosan coating on PS demonstrates the active packaging to extend the self-life time of grapes than the other PS

Explanation:

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