Identification of Bacillus thuringiensis bacterial strain isolated from the mine soil as a robust agent in the biosynthesis of silver nanoparticles with strong antibacterial and anti-biofilm activities

Zarepour

Zarrabi

2019

Biotechnology Reports

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Section: Resultsmentioning

confidence: 99%

Green synthesis of silver nanoparticles at low temperature in a fast pace with unique DPPH radical scavenging and selective cytotoxicity against MCF-7 and BT-20 tumor cell lines

Zarepour

Zarrabi

2019

Biotechnology Reports

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“…The microtiter plate technique was used to test the antimicrobial activity of the bacteriocin‐producing Lactobacilli (Khaleghi, Khorrami, & Ravan, 2019). Briefly, 150 µl of the isolated strain was inoculated into 100 ml MRS broth and incubated for 24 hr.…”

Section: Methodsmentioning

confidence: 99%

Bacteriostatic activity and partial characterization of the bacteriocin produced by L. plantarum sp. isolated from traditional sourdough

Zangeneh

Food Science & Nutrition

Khaleghi

2020

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Although rapid advances occurred in food processing technologies, preservation of nourishments for a long-term period has always been one of the most challenging issues. Meanwhile, the demand for healthy, ready food is increasing in the modern world, putting the industry under pressure to meet these requirements and being profitable too. On the other hand, the bacterial resistance to antibiotics and dwindling ready foods' quality have raised many concerns. To solve these problems, many experts have recently focused on biological agents, such as plant extracts, animal-derived enzymes, organic acids, and probiotic bacterial strains (Del Nobile, Lucera, Costa, & Conte, 2012). Among these strategies, probiotics are in a great position due to their positive influences on the function of the human gastrointestinal tract as well as their economic features. That is why during the last decades, a large number of academic investigations have been being conducted in this area. The antimicrobial activity of probiotics is considered as an effective means to eliminate or inhibit pathogens (Dicks & Botes, 2010). Some probiotics through secreting antibacterial compounds, such

“…A wide range of attempts has been made to present novel procedures based on green chemistry principles 13 . In this approach, natural and non-toxic agents, such as the plant extracts, bacteria, fungi, and unicellular microorganisms are applied as the reducing and stabilizing agents in the process of nanoparticle’s production 14 . In addition to the straightforward, cheap and environment-friendly procedure, it is able to reduce the biomedicine application-related concerns 10,13,15,16 .…”

Section: Introductionmentioning

confidence: 99%

An Improved Method for Fabrication of Ag-GO Nanocomposite with Controlled Anti-Cancer and Anti-bacterial Behavior; A Comparative Study

Abdollahi

Eshaghi

et al. 2019

Sci Rep

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In this study, two green procedures for Silver-Graphene Oxide (Ag-GO) nanocomposite synthesis were investigated. As a common method, AgNO 3 was first loaded on the GO surface and then was reduced and stabilized by walnut green husk extract, producing Ag-GO-І. As an innovative approach, GO was first exposed to the extract and then the AgNO 3 was added as the second step, producing Ag-GO-П. Physicochemical properties, antibacterial and cytotoxicity activity of both nanocomposites were subsequently studied comparing with free silver nanoparticles (AgNPs) and pure GO. Based on the results, exposure of GO to the extract, as a reducing agent, at the first/last step of the synthesis process resulted in the fundamental differences in the final products. So that, high amounts of agglomerated silver nanoparticles were formed between the GO sheets, when using the common method, whereas in Ag-GO-П, small AgNPs were formed on the GO sheets without aggregation, entirely covering the sheets. Antibacterial and cytotoxic behavior of these nanomaterials could be compared as AgNPs > Ag-GO-П > Ag-GO-І. It is assumed that these differences are due to control of unwanted nucleation in the synthesis process that Ag nanoparticles are smaller with less agglomeration when the GO surfaces are pre-treated with reducing agent.