One-step preparation of banana powder/silver nanoparticles composite films

Abstract

Silver nanoparticles (Ag-NPs) were synthesized using banana powder as a reducing and stabilizing agent, and banana/Ag-NPs composite films with different concentration of Ag-NPs were prepared simultaneously. The composite films were yellowish brown and exhibited characteristic plasmon resonance peak of Ag-NPs at 430 nm. The optical, mechanical, water vapor barrier, thermal stability, and antimicrobial properties of the composite films were greatly influenced by the concentration of Ag-NPs. The composite film with a silver concentration of 1.0 mM demonstrated the highest tensile strength, thermal stability, transparency, and water contact angle with the lowest water vapor permeability (1.36 ± 0.10 9 10 -9 g m/m 2 Pa s). Also, the composite films incorporated with 1.0 mM of Ag-NPs exhibited a strong antibacterial activity against both Gram-positive (Listeria monocytogenes) and Gram-negative (Escherichia coli) food-borne pathogenic bacteria.

Biopolymers-Based Materials Containing Silver Nanoparticles as Active Packaging for Food Applications–A Review

“…Several studies have shown that the addition of silver nanoparticles caused a significant reduction in the water vapour permeability values of biopolymer nanofilms [21,22,24,25,50,55,56,58,59]. The decrease in the water vapour permeability of investigated films was attributed to the distribution of silver nanoparticles as a discontinuous phase in the polymer matrix, which affected lower diffusion of water molecules through the films.…”

“…Similar results of a weakened water vapour barrier property due to the addition of silver nanoparticles were obtained by Shankar et al [49] for agar films. Moreover, Kanmani et al [48] and Orsuwan et al [24] found no changes in the water vapour permeability values due to the presence of silver nanoparticles when gelatin nanocomposite films and agar/banana powder films, respectively, were investigated. Similar observations were made by Shankar et al [37] for pectin films.…”

“…Several studies have confirmed that depending on the silver nanoparticles' concentration, nanocomposite materials exhibited bacteriostatic or bactericidal activity. In particular, a higher concentration of silver nanoparticles is required to achieve higher antimicrobial activity [22][23][24][25][26]. For example, Bahrami et al [22] and Youssef et al [26] demonstrated that adding a higher percentage of AgNPs to biopolymer cause greater inhibition zones diameter against tested microorganisms.…”

Food waste as a source of value‐added chemicals and materials: a biorefinery perspective

“…Also, using banana peels, not only could AgNO 3 be reduced to NPs but also banana/AgNPs composite films could be fabricated using a solvent casting method. The films showed good features as UV light barrier as well as an antimicrobial, for which they could be used in food packaging (Orsuwan et al, 2017).…”

Reinforcement of banana flour biocomposite film with beeswax and montmorillonite and effects on water barrier and physical properties

“…Banana ( Musa sapientum Linn, ABB group ‘Kluai Namwa’) grows well in tropical and subtropical countries in South‐East Asia, especially Thailand. Unripe banana is a potential source of flour production during the overproduction season (Sothornvit & Pitak, ; Pelissari et al ., ; Orsuwan et al ., , ). Banana flour can be classified as a hydrocolloid material due to its property of forming viscous dispersions and gels when dispersed in hot water.…”