A trigger non-contact antibacterial packaging based on modified basic magnesium hypochlorite (BMH) and application on preservation effect of fresh lotus seeds

Abstract

An antibacterial package material based on Basic Magnesium Hypochlorite (BMH) modified by epoxy soybean oil and monoglyceride was invented using a twin-screw extrusion device through the upper blowing method, and then produced to antibacterial bags by the bag making machine. Comparing the relevant properties of antibacterial bags with ordinary PE bags, antibacterial bag reduced the oxygen, carbon dioxide, and water vapor transmission rates of the films by 43 %, 29 %, and 13 %, respectively than ordinary PE bag. The antibacterial agents distribute evenly in plastic film and the addition of them does not have significant effect on the melting point of the film. Applied two bags to the preservation of fresh lotus seeds, and stored the packed lotus seeds at 4 ℃. total bacterial count (TBC), chromatic values, moisture content, soluble solids content, starch content, hardness, malondialdehyde (MDA) concentration, polyphenol oxidase (PPO) activity, and peroxidase (POD) activity of lotus seeds in each stage of the storage period were evaluated. Compared with ordinary PE bags, antibacterial bag packaging can reduce the total number of bacteria and water loss of lotus seeds, delay browning and increasing in hardness value, reduce the degradation of soluble solids and accumulation of starch, prevent MDA producing, and affect the activity of PPO and POD, length the shelf time to about 25days. These results suggest that antimicrobial bag is an effective package to delay the postharvest senescence of fresh lotus seeds.