Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films

AbstractWith the increasing application of polyvinyl alcohol (PVA) films in the field of food packaging, it is important to improve its mechanical and antibacterial properties. This paper focuses on the preparation of PVA nanocomposite films and how their properties are affected by a silver-loaded nanocellulose solution. Cellulose nanocrystals (CNCs) were used as both the carrier and the dispersant of silver nanoparticles (AgNPs) prepared using glucose as the reducing agent. Ag+ was stabilized by the many hydroxyl groups located in the CNCs, and then the Ag+ was reduced to AgNPs in situ. After addition of silver-loaded nanocellulose, the tensile strength of the CNC-PVA-AgNP films increased from 47 MPa to 73 MPa, and the nanocomposite films displayed reduced moisture absorption and good antibacterial properties.

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Ionic Liquids as Delaminating Agents of Layered Double Hydroxide during In-Situ Synthesis of Poly (Butylene Adipate-co-Terephthalate) Nanocomposites

Nanomaterials ◽

10.3390/nano9040618 ◽

2019 ◽

Vol 9 (4) ◽

pp. 618 ◽

Cited By ~ 4

Author(s):

Hynek Beneš ◽

Jana Kredatusová ◽

Jakub Peter ◽

Sébastien Livi ◽

Sonia Bujok ◽

...

Keyword(s):

Food Packaging ◽

Water Vapor Permeability ◽

Nanocomposite Films ◽

Precipitation Method ◽

Vapor Permeability ◽

Inorganic Particles ◽

In Situ Preparation ◽

End Use ◽

Co Precipitation

Currently, highly demanded biodegradable or bio-sourced plastics exhibit inherent drawbacks due to their limited processability and end-use properties (barrier, mechanical, etc.). To overcome all of these shortcomings, the incorporation of lamellar inorganic particles, such as layered double hydroxides (LDH) seems to be appropriate. However, LDH delamination and homogenous dispersion in a polymer matrix without use of harmful solvents, remains a challenging issue, which explains why LDH-based polymer nanocomposites have not been scaled-up yet. In this work, LDH with intercalated ionic liquid (IL) anions were synthesized by a direct co-precipitation method in the presence of phosphonium IL and subsequently used as functional nanofillers for in-situ preparation of poly (butylene adipate-co-terephthalate) (PBAT) nanocomposites. The intercalated IL-anions promoted LDH swelling in monomers and LDH delamination during the course of in-situ polycondensation, which led to the production of PBAT/LDH nanocomposites with intercalated and exfoliated morphology containing well-dispersed LDH nanoplatelets. The prepared nanocomposite films showed improved water vapor permeability and mechanical properties and slightly increased crystallization degree and therefore can be considered excellent candidates for food packaging applications.

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Fabrication, Characterization, and Antibacterial Properties of Electrospun Membrane Composed of Gum Karaya, Polyvinyl Alcohol, and Silver Nanoparticles

Journal of Nanomaterials ◽

10.1155/2015/750726 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 14

Author(s):

Vinod Vellora Thekkae Padil ◽

Nhung H. A. Nguyen ◽

Alena Ševců ◽

Miroslav Černík

Keyword(s):

Electron Microscopy ◽

Silver Nanoparticles ◽

Polyvinyl Alcohol ◽

Food Packaging ◽

Chemical Reduction ◽

Antibacterial Properties ◽

Hydroxyl Groups ◽

Ag Nps ◽

Gum Karaya ◽

Nanofiber Membranes

Gum karaya (GK), a natural hydrocolloid, was mixed with polyvinyl alcohol (PVA) at different weight ratios and electrospun to produce PVA/GK nanofibers. An 80 : 20 PVA/GK ratio produced the most suitable nanofiber for further testing. Silver nanoparticles (Ag-NPs) were synthesised through chemical reduction of AgNO3(at different concentrations) in the PVA/GK solution, the GK hydroxyl groups being oxidised to carbonyl groups, and Ag+cations reduced to metallic Ag-NPs. These PVA/GK/Ag solutions were then electrospun to produce nanofiber membranes containing Ag-NPs (Ag-MEMs). Membrane morphology and other characteristics were analysed using scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy, and UV-Vis and ATR-FTIR spectroscopy. The antibacterial activity of the Ag-NP solution and Ag-MEM was then investigated against Gram-negativeEscherichia coliandPseudomonas aeruginosaand Gram-positiveStaphylococcus aureus. Our results show that electrospun nanofiber membranes based on natural hydrocolloid, synthetic polymer, and Ag-NPs have many potential uses in medical applications, food packaging, and water treatment.

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Carboxymethyl cellulose/cellulose nanocrystals immobilized silver nanoparticles as an effective coating to improve barrier and antibacterial properties of paper for food packaging applications

Carbohydrate Polymers ◽

10.1016/j.carbpol.2020.117156 ◽

2021 ◽

Vol 252 ◽

pp. 117156 ◽

Cited By ~ 1

Author(s):

Yunqing He ◽

Hui Li ◽

Xiang Fei ◽

Lincai Peng

Keyword(s):

Silver Nanoparticles ◽

Cellulose Nanocrystals ◽

Carboxymethyl Cellulose ◽

Food Packaging ◽

Antibacterial Properties

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Effect of Na- and Organo-Modified Montmorillonite/Essential Oil Nanohybrids on the Kinetics of the In Situ Radical Polymerization of Styrene

Nanomaterials ◽

10.3390/nano11020474 ◽

2021 ◽

Vol 11 (2) ◽

pp. 474

Author(s):

Ioannis S. Tsagkalias ◽

Alexandra Loukidi ◽

Stella Chatzimichailidou ◽

Constantinos E. Salmas ◽

Aris E. Giannakas ◽

...

Keyword(s):

Essential Oil ◽

Radical Polymerization ◽

Food Packaging ◽

In Situ Polymerization ◽

Average Molecular Weight ◽

Monomer Conversion ◽

Hydroxyl Groups ◽

Modified Montmorillonite ◽

Kinetics Of

The great concern about the use of hazardous additives in food packaging materials has shown the way to new bio-based materials, such as nanoclays incorporating bioactive essential oils (EO). One of the still unresolved issues is the proper incorporation of these materials into a polymeric matrix. The in situ polymerization seems to be a promising technique, not requiring high temperatures or toxic solvents. Therefore, in this study, the bulk radical polymerization of styrene was investigated in the presence of sodium montmorillonite (NaMMT) and organo-modified montmorillonite (orgMMT) including thyme (TO), oregano (OO), and basil (BO) essential oil. It was found that the hydroxyl groups present in the main ingredients of TO and OO may participate in side retardation reactions leading to lower polymerization rates (measured gravimetrically by the variation of monomer conversion with time) accompanied by higher polymer average molecular weight (measured via GPC). The use of BO did not seem to affect significantly the polymerization kinetics and polymer MWD. These results were verified from independent experiments using model compounds, thymol, carvacrol and estragol instead of the clays. Partially intercalated structures were revealed from XRD scans. The glass transition temperature (from DSC) and the thermal stability (from TGA) of the nanocomposites formed were slightly increased from 95 to 98 °C and from 435 to 445 °C, respectively. Finally, better dispersion was observed when orgMMT was added instead of NaMMT.

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Sodium alginate-based nanocomposite films with strong antioxidant and antibacterial properties enhanced by polyphenol-rich kiwi peel extracts bio-reduced silver nanoparticles

Food Packaging and Shelf Life ◽

10.1016/j.fpsl.2021.100741 ◽

2021 ◽

Vol 29 ◽

pp. 100741

Author(s):

Xinyu Sun ◽

Hui Zhang ◽

Jiao Wang ◽

Mengna Dong ◽

Pei Jia ◽

...

Keyword(s):

Silver Nanoparticles ◽

Sodium Alginate ◽

Antibacterial Properties ◽

Nanocomposite Films

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Sustainable use of biowaste for synthesis of silver nanoparticles and its incorporation into gelatin‐based nanocomposite films for antimicrobial food packaging applications

Journal of Food Process Engineering ◽

10.1111/jfpe.13641 ◽

2021 ◽

Author(s):

Elumalai Kowsalya ◽

Kithiyon MosaChristas ◽

Pannerselvam Balashanmugam ◽

Veerasamy Manivasagan ◽

Thiyagarajan Devasena ◽

...

Keyword(s):

Silver Nanoparticles ◽

Food Packaging ◽

Sustainable Use ◽

Nanocomposite Films

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Evaluation of the Genotoxic and Oxidative Damage Potential of Silver Nanoparticles in Human NCM460 and HCT116 Cells

International Journal of Molecular Sciences ◽

10.3390/ijms21051618 ◽

2020 ◽

Vol 21 (5) ◽

pp. 1618 ◽

Cited By ~ 6

Author(s):

Mingxi Jia ◽

Wenjing Zhang ◽

Taojin He ◽

Meng Shu ◽

Jing Deng ◽

...

Keyword(s):

Oxidative Damage ◽

Food Packaging ◽

Antibacterial Properties ◽

Human Colon ◽

Ag Nps ◽

Damage Potential ◽

Human Colon Cancer ◽

Colon Cells ◽

Antibacterial Textiles ◽

The Many

Nano Ag has excellent antibacterial properties and is widely used in various antibacterial materials, such as antibacterial medicine and medical devices, food packaging materials and antibacterial textiles. Despite the many benefits of nano-Ag, more and more research indicates that it may have potential biotoxic effects. Studies have shown that people who ingest nanoparticles by mouth have the highest uptake in the intestinal tract, and that the colon area is the most vulnerable to damage and causes the disease. In this study, we examined the toxic effects of different concentrations of Ag-NPs on normal human colon cells (NCM460) and human colon cancer cells (HCT116). As the concentration of nanoparticles increased, the activity of the two colon cells decreased and intracellular reactive oxygen species (ROS) increased. RT-qPCR and Western-blot analyses showed that Ag NPs can promote the increase in P38 protein phosphorylation levels in two colon cells and promote the expression of P53 and Bax. The analysis also showed that Ag NPs can promote the down-regulation of Bcl-2, leading to an increased Bax/Bcl-2 ratio and activation of P21, further accelerating cell death. This study showed that a low concentration of nano Ag has no obvious toxic effect on colon cells, while nano Ag with concentrations higher than 15 μg/mL will cause oxidative damage to colon cells.

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