NGHIÊN CỨU CHẾ TẠO MÀNG SINH HỌC TRÊN CƠ SỞ TINH BỘT SẮN KẾT HỢP VỚI NANO Ag VÀ SiO2 ỨNG DỤNG TRONG BẢO QUẢN CAM THIÊN AN

Abstract

Fabrication of biofilm based on cassava starch, PVA (Polyvinyl alcohol), nano Ag and nano SiO₂. The properties of the membrane are determined by the criteria of tensile strength, antibacterial ability of the membrane, and the ability to prolong the preservation time of Thien An oranges. Research results show that: The tensile strength of the starch/PVA film reaches a value of 10 N/mm², when adding 25 mL of SiO₂ sol and Ag 3% by weight in the process of creating the starch/PVA nano Ag film, SiO₂, tensile strength of starch/PVA/Ag film, SiO₂ achieved 19.7 N/mm², the film has antibacterial ability on two bacterial strains Bulgaricus subtilis and Staphylococcus aureus. When using manufactured packaging to preserve Thien An oranges, after a period of storage, the properties of weight loss and vitamin C content are superior to samples without biological packaging.