Biosynthesis of MgO Nanoparticles and Their Impact on the Properties of the PVA/Gelatin Nanocomposites for Smart Food Packaging Applications
Marwa Rabee,
Soma Ahmed Elmogy,
Mohamed Morsy
et al.
Abstract:Fabricating active and intelligent packaging materials has become the highest demand for catering to market needs, especially after the COVID-19 pandemic, for ensuring food safety. Thus, the wider objective of this article was to promote active and smart packaging biofilms possessing antibacterial and humidity-sensing properties for sustainable poly(vinyl alcohol) (PVA)/gelatin (Ge) reinforced with biosynthesized magnesium nanoparticles (MgO NPs) by a solvent-casting route. The UV−visible spectrum has been uti… Show more
“…The dumbbell specimen's preparation and its environmental conditions were adjusted as described elsewhere. 36,38 The mean value of ve replicates for each lm was recorded.…”
“…The dumbbell specimen's preparation and its environmental conditions were adjusted as described elsewhere. 36,38 The mean value of ve replicates for each lm was recorded.…”
“…The extensive use of nonbiodegradable plastics in food packaging raises significant environmental concerns due to the large amount of waste generated. , Additionally, microbial contamination throughout the food supply chain poses a critical risk to both human health and the food industry. , This highlights the urgent need for developing biocompatible or biodegradable packaging materials with potential antibacterial properties. In the case of chitosan (CS) and cellulose, their remarkably akin molecular structures allow for the creation of homogeneous blends, making them an intriguing option .…”
Section: Introductionmentioning
confidence: 99%
“…They incorporated folic acid functionalized graphene oxide (GO-FA) into a CS/poly(vinyl alcohol) (PVA) blend, significantly improving the sensor’s sensitivity and response/recovery times compared to unmodified sensors. Rabee et al 4 addresses the growing demand for active and intelligent food packaging materials. They developed biofilms made from PVA/gelatin reinforced with biosynthesized magnesium NPs (MgO NPs).…”
The synthesis of
nanoparticles using environmentally friendly methods
for applications in fields such as food packaging and biomedicine
has been gaining increasing attention. Organic–inorganic nanostructures
offer opportunities to create innovative materials suitable for use
in optoelectronics and biological applications. In this study, we
focused on producing nanocomposite films by blending carboxymethyl
cellulose (CMC) and chitosan (CS) polymers in equal proportions (50/50
wt %) and adding silver nanoparticles (Ag NPs) through a solution
casting process. Our objective was to examine how the introduction
of Ag NPs influenced the structural, optical, mechanical, electrical,
and antibacterial properties of the virgin CMC/CS composites. XRD
patterns of the prepared samples indicated the presence of crystalline
Ag phases within the CMC/CS blend. FT-IR spectroscopy showed the primary
vibrational peaks associated with CMC and CS, which exhibited reduced
intensity after the addition of Ag NPs. The UV absorption of the nanocomposites
exhibited a gradual increase and a shift toward longer wavelengths.
The electrical properties are enhanced with higher concentrations
of Ag NPs. An increase in the content of Ag NPs resulted in a corresponding
enhancement of antibacterial activity against both Staphylococcus aureus and Escherichia
coli. The CMC/CS-Ag-doped films demonstrated significant
enhancements in Young’s modulus (Y), tensile stress (σt), and elongation at break (εB). These findings
suggest that these nanocomposite films hold promise for potential
applications in optoelectronics and biological fields.
“…BNC conveys zero toxicity and perfect biocompatibility, which promotes its biomedical applicability 17 . Applications of nanocellulose encompass plastic reinforcement, chemical modification, transparent plastics for lenses, hygiene pads, dental implants, and wound healing 18 , 19 .…”
Chemical processing is among the significant keys to tackle agro-residues utilization field, aiming to obtain value-added materials. Extraction of cellulose nanocrystals (CNCs) is an emerging route to valorize lignocellulosic wastes into high value particles. In this investigation, effect of acidic hydrolysis duration was monitored on size and morphology of obtained crystals; namely: CNCs from Nile roses fibers (NRFs) (Eichhornia crassipes). Different acidic hydrolysis duration range or different characterization techniques set this article apart from relevant literature, including our group research articles. The grinded NRFs were firstly subjected to alkaline and bleaching pretreatments, then acid hydrolysis process was carried out with varied durations ranging from 5 to 30 min. Microcrystalline cellulose (MCC) was used as reference for comparison with NRFs based samples. The extracted CNCs samples were investigated using various techniques such as scanning electron microscopy (SEM), Atomic force microscopy (AFM), Raman spectroscopy, and thermogravimetric (TGA) analysis. The figures gotten from SEM and AFM depicted that NRFs based CNCs appeared as fibril-like shapes, with reduced average size when the NRFs underwent pulping and bleaching processes. This was indicated that the elimination of hemicellulose and lignin components got achieved successfully. This outcome was proven by chemical composition measurements and TGA/DTG curves. On the other hand, AFM-3D images indicated that CNCs topology and surface roughness were mostly affected by increasing hydrolysis durations, besides smooth and homogeneous surfaces were noticed. Moreover, Raman spectra demonstrated that the particle size and crystallinity degree of NRFs based CNCs can be affected by acidic hydrolysis durations and optimum extraction time was found to be 10 min. Thermal stability of extracted CNCs-NRFs and CNCs-MCC was measured by TGA/DTG and the kinetic models were suggested to identify the kinetic parameters of the thermal decomposition of CNCs for each acid hydrolysis duration. Increasing hydrolysis duration promoted thermal stability, particularly for NRFs based CNCs. Results showcased in this article add new perspective to Nile rose nanocellulose and pave down the way to fabricate NRFs based humidity nano-sensors.
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