Eco-friendly cellulose acetate green synthesized silver nano-composite as antibacterial packaging system for food safety

Marrez, Diaa A.; Abdelhamid, Ahmed E.; Darwesh, Osama M.

doi:10.1016/j.fpsl.2019.100302

Cited by 115 publications

(61 citation statements)

References 45 publications

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“…Recently, the field of nanotechnology research has become more active and attractive due to the promising industrial, agricultural, environmental, and health applications. Nanomaterials with particle sizes less than 100 nm are considered to be significant milestones of rapidly developing field of nanotechnology studies and applications [10,11]. Nanoparticle size plays important roles in catalytic efficiency, thermal conductivity, chemical performance as well as antimicrobial activity [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nitrogen Source and Growth Phase on Extracellular Biosynthesis of Silver Nanoparticles Using Cultural Filtrates of Scenedesmus obliquus

et al. 2019

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In this study, silver nanoparticles (AgNPs) were green-synthesized extracellularly by the action of bioactive compounds in cultural filtrates of green microalga Scenedesmus obliquus (KY621475). The influences of six different nitrogen sources (i.e., NaNO3, CO(NH4)2, (NH4)2CO3, KNO3, NH4NO3, and (NH4)2SO4) on extracellular biosynthesis of AgNPs were observed by UV–Visible spectroscopy (380–425 nm) and confirmed using high-resolution transmission electron microscopy (HRTEM). The highest biomass production was observed in the case of urea and ammonium carbonate treatments, which, surprisingly, showed negative activity for AgNPs biosynthesis. Considering their coupling and compatible presence in cultural filtrates, reductases (especially nitrate reductase) as reduction agents are assumed to play a key role in the extracellular biosynthesis of AgNPs. The cultural filtrates of the potassium and sodium nitrate treatments produce AgNPs of relatively small size (5–10 and 4–10 nm, respectively), smaller than those produced by filtrate of ammonium nitrate treatment. The antimicrobial activity of produced AgNPs was a function mainly of particle size, which was influenced by the nitrogen source of the microalgal culture. The AgNPs produced from the KNO3 and NaNO3 cultural filtrates performed the best as antimicrobial agents.

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Section: Introductionmentioning

confidence: 99%

Influence of Nitrogen Source and Growth Phase on Extracellular Biosynthesis of Silver Nanoparticles Using Cultural Filtrates of Scenedesmus obliquus

et al. 2019

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“…New biotechnology deals to search about new isolates that have ability to grow and work at harsh conditions like extreme temperatures and pH values for using it in industrial, biotechnological and environmental applications [1][2][3]. Also, it goes up for solving problems by producing of producing nontraditional materials as antimicrobial agents [4][5][6], nanobiosynthesized metals like silver, copper and zinc [7,8] and biotechnological agents as bioactive materials [9][10][11][12]. Extremophile microorganisms have various adaptation mechanisms enabling them to thrive and produce secondary metabolites under harsh conditions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Extremophile microorganisms have various adaptation mechanisms enabling them to thrive and produce secondary metabolites under harsh conditions [13][14][15]. Extremophiles are ≤ H y [6][7][8][9][10][11][12][13][14][15][16][17][18]. Extremophiles isolates from different habitats include soil, compost, manure [19], geothermal areas [20], sewage sludge or municipal solid waste [21], oil wells [22] and thermally treated foods [23].…”

Section: Introductionmentioning

confidence: 99%

Thermoflavimicrobium dichotomicum as a novel thermoalkaliphile for production of environmental and industrial enzymes

2019

Biointerface Res Appl Chem

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Thermoalkaliphilic actinomycetes enzymes have many important applications in many industrial, biotechnological and environmental aspects. So, the current study aimed to obtain the thermoalkali-enzymes producing actinomycetes. A novel thermoalkaliphilic actinomycete strain was isolated from Egyptian Siwa oasis and identified according to its morphological, physiological and biochemical characters as Thermoflavimicrobium dichotomicum. And then confirmed by phylogenetic analysis and the partial sequence was deposited in GenBank under accession number of KR011193 and name of Thermoflavimicrobium dichotomicum HwSw11. It could produce amylase, cellulase, lipase, pectinase and proteinase enzymes. Also, this strain exhibited anti-bacterial activities against P. aeruginosa and E. coli with inhibition zones of 14 and 20 mm, respectively. Consequently, it has antifungal activity against A. niger, A. flavus and Penicillium notatum with inhibition zones of 17, 14 and 14 mm, respectively. For that, it may be concluded that Thermoflavimicrobium dichotomicum HwSw11 as a novel thermoalkaliphile has a wide range of biological activities against a broad spectrum of pathogenic bacteria and fungi, in addition to produce many enzymes (amylase, cellulase, lipase, pectinase and proteinase). So, this isolate could be applied as manufactory for many industrial, biotechnological and environmental sectors.

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“…1(B)) show that the broad absorption peaks at 3500-3300 cm −1 and narrower peaks at 1591 cm −1 are stretching and bending vibration absorption peaks of nonassociative -OH, indicating capillary water and adsorbed water in the samples. 52,53 Two peaks at 2926 and 2850 cm −1 are attributed to C H stretching vibrations, 54 illustrating few TEA in the samples. The less prominent peaks at 2362 and 2341 cm −1 are attributed to CO 2 molecular in the air.…”

Section: Resultsmentioning

confidence: 99%

Preparation, characterization and antibacterial mechanism of the chitosan coatings modified by Ag/ZnO microspheres

Wei

et al. 2020

J Sci Food Agric

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BACKGROUND: To improve the physicochemical and antibacterial properties of coatings, the chitosan (CS) coatings were respectively prepared by a casting method with zinc oxide (ZnO) and silver (Ag)/ZnO microspheres as modifiers. The chemical structures and micromorphology of ZnO, Ag/ZnO microspheres and CS coatings were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. Furthermore, using the dominant spoilage bacteria of aquatic products, Shewanella putrefaciens and Pseudomonas aeruginosa, as objects, the antibacterial activities and mechanism of the CS coatings were investigated. RESULTS: The results show that ZnO and Ag/ZnO microspheres are dispersed homogeneously in the CS coatings. After modified by ZnO and Ag/ZnO microspheres, the mechanical properties and antibacterial abilities of the CS coatings are improved, and that of 0.5% Ag/ZnO-CS coating is the optimal. For pure CS coating, the bacterial cell membrane is damaged slightly because of the electrostatic interaction between NH 3+ of CS and the negative charge on bacterial surface. After treated by ZnO-CS composite coating, the bacterial cell membrane is destroyed badly on account of the earlier-mentioned ion interaction and disturbing the synthesis of high molecular weight total protein. CONCLUSION: With regard to Ag/ZnO-CS composite coating, the bacterial cell membrane is damaged seriously and cell contents are completely released due to ion interaction, disturbing the synthesis of high molecular weight total protein and low molecular weight membrane protein. Hence, Ag/ZnO-CS composite coatings are antimicrobial materials and food preservative materials with great potential application.

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Eco-friendly cellulose acetate green synthesized silver nano-composite as antibacterial packaging system for food safety

Cited by 115 publications

References 45 publications

Influence of Nitrogen Source and Growth Phase on Extracellular Biosynthesis of Silver Nanoparticles Using Cultural Filtrates of Scenedesmus obliquus

Influence of Nitrogen Source and Growth Phase on Extracellular Biosynthesis of Silver Nanoparticles Using Cultural Filtrates of Scenedesmus obliquus

Thermoflavimicrobium dichotomicum as a novel thermoalkaliphile for production of environmental and industrial enzymes

Preparation, characterization and antibacterial mechanism of the chitosan coatings modified by Ag/ZnO microspheres

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