Modification of diatom using silver nanoparticle to improve antimicrobial activity

Sherief, Marwa A.; El‐Bassyouni, Gehan T.; Gamal, Amira A.; Esawy, Mona A.

doi:10.1016/j.matpr.2020.05.391

Cited by 15 publications

(12 citation statements)

References 24 publications

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“…The composite was then added with a carboxymethyl cellulose solution followed by calcination at 400 °C [21]. Besides, the researchers used chemicals such as sodium borohydride solution [22], hydrogen peroxide [23], and Tollens' reagent [24][25] to produce AgNPs. However, some of these methods are not environmentally friendly and expensive because they use high calcination temperatures and toxic reducing agents.…”

Section: ■ Introductionmentioning

confidence: 99%

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (<i>Ananas comosus</i>) Leaf Extract

Hamdiani

Shih

2021

Indones. J. Chem.

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This study aims to develop a green method to load silver nanoparticles (AgNPs) into the diatomite (D) pores to produce AgNPs-D composite material. The AgNPs were synthesized by pineapple leaf extract at the temperature of 70 °C for 30 min. The composite formation was characterized by UV-Vis, FTIR, TGA, particle sizes analysis, gravimetric, and color observation. The appearance of surface plasmon bands in 440–460 nm confirms the AgNPs formation. The percentage of the AgNO3 which converted to AgNPs was 99.8%. The smallest particle size of AgNPs was 30 nm, obtained in an AgNO3 concentration of 1 mM with a stirring time of 24 h at 70 °C. The colloidal AgNPs were stable for up to 7 days. The adsorption process of AgNPs was marked by the appearance of –C=O and –C–O– groups peak at 1740 and 1366 cm–1 on the FTIR spectrum. By adsorption and gravimetric technique, as much as 1 wt.% of AgNPs were loaded into D pores. The color of diatomite material changes from white to reddish-brown. The TGA analysis showed that the remaining D and AgNPs-D at 580 °C are 98.22% and 95.74%, respectively. The AgNPs loading through the green technology technique was expected to increase diatomite application in the biomedical field.

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Section: ■ Introductionmentioning

confidence: 99%

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (<i>Ananas comosus</i>) Leaf Extract

Hamdiani

Shih

2021

Indones. J. Chem.

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“…The inoculated plates were incubated for 24 h at their optimum growth temperatures, and the diameter of the inhibition zone was measured in cm. The experiments were repeated two times for each microorganism strain and the results reported were the mean value [16].…”

Section: Antimicrobial Activity Of Samples By Agar Diffusionmentioning

confidence: 99%

“…d. Dibrov et al [45] argued that low concentration of Ag + ions produced a massive proton leakage through the bacterial membrane, resulting finally to cell death. The biochemical metabolic mechanism of glass samples for inhibition of growth of various pathogens including Escherichia coli, Staphylococcus aureus, Bacillus cereus, Candida albicans and Aspergillusniger is explained by many mechanisms one of them is chemical capability of natural metabolites to bind chemically with nucleic acids represented by DNA and RNA leading to decrease or inhibit the biochemical and physiological functions of these samples in the pathogenic bacteria cell [16,46] .Also the hydroxyl group(s) abundant have chemical ability for destruction of the wall and membrane belonging to pathogens cell leading to change in the tertiary structure of proteins existing in the cell of pathogenic bacteria. Some studies proved the high ability of silver ions (heavy metals) to distract the primary metabolism of lipids, carbohydrates and proteins present in the living cell of pathogenic bacteria leading to consumption of biochemical energy of these pathogens.…”

Section: Suggested Mechanism Of Antibacterial Activities Of the Glass And Related Glass-ceramicmentioning

confidence: 99%

Role of silver ions in Na2O-CaF2-P2O5 host glass and its corresponding glass-ceramic: Searching for antibacterial behavior-supplemented by spectral, optical, FTIR and SEM investigations

Ouis

Gamal

2021

Egypt. J. Chem.

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Glasses based on the base host Na2O-CaF2-P2O5 system with increasing Ag2O as additives or loading (0.2 to 1 wt%) were prepared by melting-annealing technique. Multiple characterizations of the prepared glasses were carried out. Heat-treatment of the glasses was done through a two-step protocol to convert them to their corresponding glass-ceramics derivatives. The state of silver ions was analyzed by additional optical and FTIR spectral beside SEM measurements. Antibacterial behavior of the Ag2+ ions in the studied glasses and their glass-ceramic derivatives was conducted by their response towards two G+ve strains (Staphylococcus aureus, Bacillus cereus), one G-ve bacterial strain (Escherichia coli), one yeast (Candida albicans) and one fungi (Aspergillus niger). Optical spectra show distinct UV absorption in the undoped glass spectrum and extend to near visible with increasing Ag2O content. This distinct UV absorption is assumed to originate from unavoidable trace iron (Fe3+) impurities while the peak at 420 nm is related to nanocrystalline (Ag0)n . FTIR spectra show vibrational spectra within the mid region 400-1650 cm-1which are characteristic for phosphate (PO4) groups with some suggested (PO3F) groups. The dopant silver ions show no distinct effect on the FTIR spectra. After immersion in phosphate solution FTIR spectra of the glass-ceramic reveal the formation of hydroxyapatite layer. X-ray diffraction results indicate the formation of crystalline phosphate phases for the undoped glass-ceramic. Two silver crystalline phases are identified after addition of Ag2+ ions. SEM images confirm the formation of apatite layer with different additions of silver ion. The antibacterial analysis also indicate the promising effect of the glass-ceramics than their parent glass in the bioactivity applications.

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“…Qin et al [8] evaluate the antimicrobial activity of marine diatom Thalassiosira rotula against three strains of Gram positive bacteria and six strains of Gram negative bacteria and Candida albicans. Sherief et al [9] study the antimicrobial efficiency of marine diatoms (DE) and silver diatom nanoparticle (Ag-DE/NPs) against Bacillus cereus, Staphylococcus aureus, Escherichia coli, Candida albicans and Aspergillus niger. The results revealed that the antimicrobial activity of silver diatom nanoparticle was higher than the antimicrobial activity of marine diatoms.…”

Section: Introductionmentioning

confidence: 99%

In vitro efficacy of biologically active compounds derived from Navicula arenaria against soil borne phytopathogenic Macrophomina phaseolina and Fusarium oxysporum

Alallaf

Kotab

Shafik

et al. 2021

Alfarama Journal of Basic & Applied Sciences

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Navicula arenaria Donkin 1861 is a marine microalga belongs to class of bacillariophycea. Recently, microalgae and their products are used as biological control of diseases caused by phytopathogenic fungi. This is considered environmentally ecofriendly method to overcome the plant damage caused by soil borne pathogenic fungi and thereby economic loss. Therefore, this study aimed to investigate in vitro the antifungal activity of N. arenaria isolate PS 31 extracellular and intracellular metabolites against two taxa of soil borne phytopathogenic fungi; Macrophomina phaseolina and Fusarium oxysporum. N. arenaria PS 31 hexane extract was the most effective extract on growth inhibition of both phytopathogenic fungi. There is no significant difference between miconazole and N. arenaria hexane extract of 5.6 mg/ml on growth inhibition of F. oxysporum. The inhibitory effect of hexane extract at 5.6, 4.2 and 2.8 mg/ml and ethyl acetate extract at 35% (v/v) was higher than controls. Ethyl acetate extract was effective on growth inhibition of M. phaseolina (29.67%). GC-MS analysis of N. arenaria hexane fraction revealed the presence of potent antifungal compounds such as Phenol, 2,2'-methylenebis[6-(1,1-dimethylethyl)-4methyl-, di-n-octyl phthalate, cholestane-3,5-diol, 5-acetate,(3.beta.,5.alpha.), Cholestan-3ol,(3.beta.,5.beta.)-and beta.-Sitosterol. These results suggest that N. arenaria hexane extract can be used in biological control of plant diseases caused by M. phaseolina and F. oxysporum.

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Modification of diatom using silver nanoparticle to improve antimicrobial activity

Cited by 15 publications

References 24 publications

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (<i>Ananas comosus</i>) Leaf Extract

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (<i>Ananas comosus</i>) Leaf Extract

Role of silver ions in Na2O-CaF2-P2O5 host glass and its corresponding glass-ceramic: Searching for antibacterial behavior-supplemented by spectral, optical, FTIR and SEM investigations

In vitro efficacy of biologically active compounds derived from Navicula arenaria against soil borne phytopathogenic Macrophomina phaseolina and Fusarium oxysporum

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