scholarly journals Synthesis and characterization of nanocomposites based on polylactide/silver nanoparticles, obtained by thermochemical reduction of Ag+ ions by natural or synthetic polymers

2021 ◽  
Vol 12 (4) ◽  
pp. 365-373
Author(s):  
V. L. Demchenko ◽  
◽  
M. V. Iurzhenko ◽  
S. M. Kobylinskyi ◽  
L. A. Goncharenko ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Polymer Films ◽  
Food Packaging ◽  
Antimicrobial Properties ◽  
Chloroform Solution ◽  
Natural Polymers ◽  
Opportunistic Bacteria ◽  
Structure Morphology ◽  
Thermochemical Reduction

The addition of silver ions or nanoparticles to impart antimicrobial properties to polymeric or other materials is a widely used method. However, it should be noted that the antiviral and antimicrobial effect of silver nanoparticles that come into contact with the environment, associated with their size, with a decrease in the size of nanoparticles, their effectiveness increases sharply. In the present work, we used a biodegradable polymer polylactide (PLA), which is obtained by condensation of lactic acid or ring-opening polymerization of lactide. These studies will further contribute to the development of new safe materials, in particular for food packaging, which is undoubtedly an urgent problem. The work aims is to obtain the silver-containing polymer composites based on polylactide by thermochemical reduction of Ag+ ions using natural (chitosan) and synthetic (polyethyleneimine (PEI)) polymers and to study the structure, morphology, thermomechanical and antimicrobial properties of the obtained nanocomposites. Thermochemical reduction of Ag+ ions in the bulk of polymer films, containing PLA, silver palmitate as a precursor of Ag NP and reducing agent (PEI or chitosan), has been performed by keeping them at 100–170 °C within 5 minutes. The polymeric film composites, cast from chloroform solution, were heated in an oven using precise thermal regulator VRT-3. As a result of reduction, the films get attained silver color, the Ag content in the bulk of films varied from 1 to 4 wt. %, and the thickness of the films was 110 μm. Structure, morphology, thermomechanical and antimicrobial properties of two types of nanocomposites – PLA-Ag-PEI and PLA-Ag-chitosan, formed by the thermochemical reduction of Ag+ in polymer films have been studied using wide-angle X-ray scattering (WAXS) (a DRON-4-07 diffractometer), a transmission electron microscope (TEM) (JEM-1230 JEOL, Japan), and thermomechanical analysis (a UIP-70M device). Antimicrobial activity of the obtained nanocomposites was investigated applying reference strains of opportunistic bacteria Staphylococcus aureus and Escherichia coli. It has been found that thermochemical reduction of Ag+ ions in the bulk of polymer films, when using synthetic or natural polymers (PEI or chitosan) as a reducing and stabilizing agent of silver nanoparticles occurs at 160 °C during 5 minutes. It has been found that the average size of Ag nanoparticles in the polymeric matrix is equal to ~ 7 and ~ 4 nm for PEI and chitosan, respectively. It has been shown that PLA-Ag-chitosan nanocomposites have much higher antimicrobial activity against S. aureus and E. coli strains as compared to PLA-Ag-PEI nanocomposites.

scholarly journals Basil Essential Oil: Composition, Antimicrobial Properties, and Microencapsulation to Produce Active Chitosan Films for Food Packaging

Foods ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 121
Author(s):  
Ghita Amor ◽  
Mohammed Sabbah ◽  
Lucia Caputo ◽  
Mohamed Idbella ◽  
Vincenzo De Feo ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oil ◽  
Shelf Life ◽  
Food Packaging ◽  
Antimicrobial Properties ◽  
Edible Films ◽  
Biological Properties ◽  
Oil Composition ◽  
Packaging System ◽  
Cooked Ham

The essential oil (EO) from basil—Ocimum basilicum—was characterized, microencapsulated by vibration technology, and used to prepare a new type of packaging system designed to extend the food shelf life. The basil essential oil (BEO) chemical composition and antimicrobial activity were analyzed, as well as the morphological and biological properties of the derived BEO microcapsules (BEOMC). Analysis of BEO by gas chromatography demonstrated that the main component was linalool, whereas the study of its antimicrobial activity showed a significant inhibitory effect against all the microorganisms tested, mostly Gram-positive bacteria. Moreover, the prepared BEOMC showed a spheroidal shape and retained the EO antimicrobial activity. Finally, chitosan-based edible films were produced, grafted with BEOMC, and characterized for their physicochemical and biological properties. Since their effective antimicrobial activity was demonstrated, these films were tested as packaging system by wrapping cooked ham samples during 10 days of storage, with the aim of their possible use to extend the shelf life of the product. It was demonstrated that the obtained active film can both control the bacterial growth of the cooked ham and markedly inhibit the pH increase of the packaged food.

Evaluation of Antimicrobial Activity of Silver Nanoparticles for Carboxymethylcellulose Film Applications in Food Packaging

2014 ◽  
Vol 14 (7) ◽  
pp. 5512-5517 ◽  
Author(s):  
Maria C. Siqueira ◽  
Gustavo F. Coelho ◽  
Marcia R. de Moura ◽  
Joana D. Bresolin ◽  
Silviane Z. Hubinger ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Food Packaging

scholarly journals Exploiting the Potential of Moringa oleifera Oil/Polyvinyl Chloride Polymeric Bionanocomposite Film Enriched with Silver Nanoparticles for Antimicrobial Activity

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Musarat Amina ◽  
Nawal M. Al Musayeib ◽  
Nawal A. Alarfaj ◽  
Maha F. El-Tohamy ◽  
Hisham E. Orabi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Polyvinyl Chloride ◽  
Moringa Oleifera ◽  
Shigella Flexneri ◽  
Antimicrobial Properties ◽  
Salmonella Typhi ◽  
Gas Chromatography Mass Spectrometry ◽  
X Ray ◽  
Different Strains

The present study focused on the prospect of fabricating a polymeric naturally extracted Moringa oleifera oil bionanocomposite film enriched with silver nanoparticles for antimicrobial activity. In this study, a standard concentration of Moringa oleifera oil (5-10 wt%) was used to fabricate a polymeric bionanocomposite film using polyvinyl chloride (PVC) enriched with silver nanoparticles. The active constituents of the extracted Moringa oleifera oil were verified using gas chromatography-mass spectrometry. Spectroscopic and microscopic techniques, including scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray analysis, were employed to characterize and study the surface morphology of the fabricated bionanocomposite film. The antimicrobial activity of the fabricated bionanocomposite film was investigated using different strains of bacteria and fungus. The results revealed well-oriented and excellently dispersed silver nanoparticles in the PVC-Moringa oleifera oil matrix. The bionanocomposite was able to inhibit the growth of Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella typhi, Pseudomonas aeruginosa, Shigella flexneri, and Candida albicans. The combination of nanoparticles with polymers is opening new routes for engineering fixable composites, which showed antimicrobial properties.

Antimicrobial Activity of Allyl Isothiocyanate Used To Coat Biodegradable Composite Films as Affected by Storage and Handling Conditions†

2012 ◽  
Vol 75 (12) ◽  
pp. 2234-2237 ◽  
Author(s):  
WEILI LI ◽  
LINSHU LIU ◽  
TONY Z. JIN
Keyword(s):  
Antimicrobial Activity ◽  
Polylactic Acid ◽  
Food Packaging ◽  
Storage Time ◽  
Storage Temperature ◽  
Composite Films ◽  
Antimicrobial Properties ◽  
Allyl Isothiocyanate ◽  
Microbial Reduction ◽  
Biodegradable Composite

We evaluated the effects of storage and handling conditions on the antimicrobial activity of biodegradable composite films (polylactic acid and sugar beet pulp) coated with allyl isothiocyanate (AIT). Polylactic acid and chitosan were incorporated with AIT and used to coat one side of the film. The films were subjected to different storage conditions (storage time, storage temperature, and packed or unpacked) and handling conditions (washing, abrasion, and air blowing), and the antimicrobial activity of the films against Salmonella Stanley in tryptic soy broth was determined. The films (8.16 μl of AIT per cm2 of surface area) significantly (P < 0.05) inhibited the growth of Salmonella during 24 h of incubation at 22°C, while the populations of Salmonella in controls increased from ca. 4 to over 8 log CFU/ml, indicating a minimum inactivation of 4 log CFU/ml on films in comparison to the growth on controls. Statistical analyses indicated that storage time, storage temperature, and surface abrasion affected the antimicrobial activity of the films significantly (P < 0.05). However, the differences in microbial reduction between those conditions were less than 0.5 log cycle. The results suggest that the films' antimicrobial properties are stable under practical storage and handling conditions and that these antimicrobial films have potential applications in food packaging.

Chitosan based antimicrobial films for food packaging applications

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Shipra Tripathi ◽  
G. K. Mehrotra ◽  
P. K. Dutta
Keyword(s):  
Antimicrobial Activity ◽  
Food Packaging ◽  
Antimicrobial Properties ◽  
Food Preservation ◽  
Pathogenic Microorganisms ◽  
Packaging System ◽  
Antimicrobial Packaging ◽  
Wide Range ◽  
Chitosan Films ◽  
Antimicrobial Films

AbstractAntimicrobial packaging is one of the most promising active packaging systems. Antimicrobial packaging is the packaging system that is able to kill or inhibit spoilage and pathogenic microorganisms that are contaminating foods. A tremendous effort has been made over the last decade to develop and test films with antimicrobial properties to improve food safety and shelf life. For food preservation, chitosan films are very effective. Chitosan has widely been used in antimicrobial films, to provide edible protective coating, dipping and spraying for the food products due to its antimicrobial properties. Chitosan can be formed into fibers, films, gels, sponges, beads or nanoparticles. Chitosan films have been used as a packaging material for the quality preservation of a variety of food. Chitosan has great potential for a wide range of applications due to its biodegradability, biocompatibility, antimicrobial activity, non-toxicity and versatile chemical and physical properties. The present review outlines the preparation and antimicrobial activity of chitosan based films.

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

2020 ◽  
Vol 21 (3) ◽  
pp. 698 ◽  
Author(s):  
Karolina Kraśniewska ◽  
Sabina Galus ◽  
Małgorzata Gniewosz
Keyword(s):  
Silver Nanoparticles ◽  
Food Packaging ◽  
Antimicrobial Properties ◽  
Food Products ◽  
Active Packaging ◽  
Packaging Materials ◽  
Active Food Packaging ◽  
Food Applications ◽  
External Conditions ◽  
Packaged Food

Packaging is an integral part of food products, allowing the preservation of their quality. It plays an important role, protecting the packed product from external conditions, maintaining food quality, and improving properties of the packaged food during storage. Nevertheless, commonly used packaging based on synthetic non-biodegradable polymers causes serious environmental pollution. Consequently, numerous recent studies have focused on the development of biodegradable packaging materials based on biopolymers. In addition, biopolymers may be classified as active packaging materials, since they have the ability to carry different active substances. This review presents the latest updates on the use of silver nanoparticles in packaging materials based on biopolymers. Silver nanoparticles have become an interesting component of biodegradable biopolymers, mainly due to their antimicrobial properties that allow the development of active food packaging materials to prolong the shelf life of food products. Furthermore, incorporation of silver nanoparticles into biopolymers may lead to the development of materials with improved physical-mechanical properties.

scholarly journals Antimicrobial metal-based nanoparticles: a review on their synthesis, types and antimicrobial action

2020 ◽  
Vol 11 ◽  
pp. 1450-1469
Author(s):  
Matías Guerrero Correa ◽  
Fernanda B Martínez ◽  
Cristian Patiño Vidal ◽  
Camilo Streitt ◽  
Juan Escrig ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Food Packaging ◽  
Antimicrobial Agents ◽  
Cell Damage ◽  
Metal Oxide Nanoparticles ◽  
High Surface ◽  
Antimicrobial Properties ◽  
Antimicrobial Action ◽  
Oxide Nanoparticles ◽  
Synthesis Methods

The investigation of novel nanoparticles with antimicrobial activity has grown in recent years due to the increased incidence of nosocomial infections occurring during hospitalization and food poisoning derived from foodborne pathogens. Antimicrobial agents are necessary in various fields in which biological contamination occurs. For example, in food packaging they are used to control food contamination by microbes, in the medical field the microbial agents are important for reducing the risk of contamination in invasive and routine interventions, and in the textile industry, they can limit the growth of microorganisms due to sweat. The combination of nanotechnology with materials that have an intrinsic antimicrobial activity can result in the development of novel antimicrobial substances. Specifically, metal-based nanoparticles have attracted much interest due to their broad effectiveness against pathogenic microorganisms due to their high surface area and high reactivity. The aim of this review was to explore the state-of-the-art in metal-based nanoparticles, focusing on their synthesis methods, types, and their antimicrobial action. Different techniques used to synthesize metal-based nanoparticles were discussed, including chemical and physical methods and “green synthesis” methods that are free of chemical agents. Although the most studied nanoparticles with antimicrobial properties are metallic or metal-oxide nanoparticles, other types of nanoparticles, such as superparamagnetic iron-oxide nanoparticles and silica-releasing systems also exhibit antimicrobial properties. Finally, since the quantification and understanding of the antimicrobial action of metal-based nanoparticles are key topics, several methods for evaluating in vitro antimicrobial activity and the most common antimicrobial mechanisms (e.g., cell damage and changes in the expression of metabolic genes) were discussed in this review.

scholarly journals Antimicrobial Activity of Silver Nanoparticles against Clinical Biofilms from Patients with and without Dental Caries

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Alondra Jaqueline Jiménez-Ramírez ◽  
Rita Elizabeth Martínez-Martínez ◽  
José Luis Ayala-Herrera ◽  
Erasto Armando Zaragoza-Contreras ◽  
Rubén Abraham Domínguez-Pérez ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Dental Caries ◽  
Dental Plaque ◽  
Scientific Information ◽  
Antimicrobial Properties ◽  
Inhibitory Effect ◽  
Oral Bacteria ◽  
Oral Disease ◽  
Microbiological Analysis

Dental caries is an infectious oral disease originated by the presence of different microorganisms from well-defined biofilms. Many treatments for dental caries have been demonstrated to be successful protocols; however, incidence and prevalence remain still high. Although silver nanoparticles (AgNPs) have shown excellent antimicrobial properties, even against different oral bacteria, there is no available scientific information that has evaluated the antimicrobial activity of AgNPs against oral biofilms from subjects with active dental caries. The objective of this research was to evaluate the inhibitory effect of AgNPs in dental biofilms from subjects with and without dental caries. Two sizes of AgNPs were prepared and characterized. Dental plaque samples were collected from 30 subjects with dental caries and 30 subjects with no dental caries. Microbiological analysis was determined by the minimum inhibitory concentration (MIC) of nanoparticles, and the presence and distribution of microbial strains were identified by polymerase chain reaction (PCR) assay. AgNPs had significant antimicrobial effects against all samples of dental plaque; however, the physical properties of AgNPs, as well as specific sociodemographic and clinical conditions from patients, were also associated with bacterial growth inhibition of Ag particles ( p < 0.05 ). PCR confirmed the presence of oral bacteria associated with dental caries, such as S. mutans and S. sobrinus strains, principally. The AgNPs exhibited great potential to be used as an antimicrobial therapy for the control and prevention of dental caries.

scholarly journals Antimicrobial Food Packaging with Biodegradable Polymers and Bacteriocins

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3735
Author(s):  
Małgorzata Gumienna ◽  
Barbara Górna
Keyword(s):  
Food Packaging ◽  
Antimicrobial Properties ◽  
Chemical Properties ◽  
Natural Polymers ◽  
Global Trends ◽  
Wide Range ◽  
Promising Solution ◽  
Food And Drink ◽  
Packaged Food ◽  
Physical And Chemical

Innovations in food and drink packaging result mainly from the needs and requirements of consumers, which are influenced by changing global trends. Antimicrobial and active packaging are at the forefront of current research and development for food packaging. One of the few natural polymers on the market with antimicrobial properties is biodegradable and biocompatible chitosan. It is formed as a result of chitin deacetylation. Due to these properties, the production of chitosan alone or a composite film based on chitosan is of great interest to scientists and industrialists from various fields. Chitosan films have the potential to be used as a packaging material to maintain the quality and microbiological safety of food. In addition, chitosan is widely used in antimicrobial films against a wide range of pathogenic and food spoilage microbes. Polylactic acid (PLA) is considered one of the most promising and environmentally friendly polymers due to its physical and chemical properties, including renewable, biodegradability, biocompatibility, and is considered safe (GRAS). There is great interest among scientists in the study of PLA as an alternative food packaging film with improved properties to increase its usability for food packaging applications. The aim of this review article is to draw attention to the existing possibilities of using various components in combination with chitosan, PLA, or bacteriocins to improve the properties of packaging in new food packaging technologies. Consequently, they can be a promising solution to improve the quality, delay the spoilage of packaged food, as well as increase the safety and shelf life of food.

scholarly journals pH effect on the synthesis of different size silver nanoparticles evaluated by DLS and their size-dependent antimicrobial activity

2020 ◽  
Vol 25 (4) ◽  
Author(s):  
Leiriana Aparecida Pinto Gontijo ◽  
Ellen Raphael ◽  
Daniela Pereira Santos Ferrari ◽  
Jefferson Luis Ferrari ◽  
Juliana Pereira Lyon ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Size Distribution ◽  
Colloidal Stability ◽  
Chemical Reduction ◽  
Ph Effect ◽  
Antimicrobial Properties ◽  
Size Dependent

ABSTRACT This paper reports citrate-stabilized silver nanoparticles (AgNPs) synthesized by nitrate ion chemical reduction with sodium borohydride, at different pHs (2–9). The AgNPs synthesized by this method exhibited size distribution from 5 to 249 nm, depending on pH, as determined by dynamic light scattering, and morphology spherical, as determined by transmission electron microscopy. In pH range 3–7 occurred aggregation of the nanoparticles. The size distribution depending on pH was determined by dynamic light scattering. The zeta potential was determined, and the colloidal stability was correlated with nanoparticles aggregation at different pHs. The size-dependent antimicrobial activity was evaluated for two solutions, wherein both samples exhibited antimicrobial activity, although the smallest AgNPs without agglomeration have enhanced antimicrobial properties.

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