Synthesis and characterization of novel bactericidal Cu/HPMC BNCs using chemical reduction method for food packaging

Abstract

In this research copper nanoparticles (Cu NPs) were incorporated in the biodegradable hydroxypropyl methylcellulose (HPMC) matrix using the simple and low cost chemical reduction method for application as food packaging material. The properties of Cu/HPMC bionanocomposites (BNCs) were studied as a function of the CuSO 4 concentration. Surface morphology of the film was investigated by scanning electron microscopy. Mechanical analysis and water vapor barrier properties of HPMC/Cu nanocomposites were analyzed. It was observed that mechanical and water vapor barrier properties of the films were improved by the concentration of CuSO 4 . The antibacterial activity of HPMC/Cu thin films were evaluated based on the diameter of inhibition zone in a disk diffusion test against Gram positive bacteria, ie, Streptococus A., S. epidermidis, S.aureus , B.cereus and Gram negative bacteria, ie, E. coli, E. faecalis, Salmonella, P. aeruginosa using Mueller Hinton agar at different concentration of CuSO 4 . The results revealed a greater bactericidal effectiveness for nanocomposite films containing 5 % of CuSO 4 . Packages prepared from HPMC/Cu nanocomposite films were used for meat packaging. The films were filled with meat and then stored at 4°C. Microbial stability of the meat was evaluated after 3, 7, 10 and 15 days of storage. The results showed that microbial growth rate significantly reduced as a result of using this nanocomposite packaging material.

New technique for improving fish packaging hygiene and prolonged shelf life

“…The fish were incubated between 28±2°C/examined daily for 7, 14, and 18 days and 18±2°C/examined daily for 18 days. The experiments were repeated at least 5 times using each concentration for results confirmation (Ebrahimiasl and Rajabpour, 2015;Al-Naamani et al, 2016).…”

Recent advances in polymer-metallic composites for food packaging applications

“…This film was prepared by mixing pre-synthesized CuNPs using a microwave assisted method with the LDPE polymer solution. In another study, a CuNPs-HPMC binary film showed potential for food packaging due to the increased antimicrobial activity, gas barrier properties, and the inhibition of the total bacteria count in a packed sample of minced meat (Table 1) (Ebrahimiasl & Rajabpour, 2015).…”

Employing Nanosilver, Nanocopper, and Nanoclays in Food Packaging Production: A Systematic Review

“…The obtained articles were selected based on the following eligibility criteria according to our search strategy (Figure 1): (1) only articles published in the recent 10 years were considered; (2) only English articles were selected (studies in other languages were excluded); (3) only original research articles were chosen (review articles were removed); (4) only full text and peer-reviewed journal articles were considered; (5) only research articles directly associated with NPs for food packaging were selected. In the end, 19 articles were included in the literature review part of this study [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”