Positive Effects of the Ultrasound on Biosynthesis, Characteristics and Antibacterial Activity of Silver Nanoparticles Using <i>Fortunella Japonica</i>

Abstract

Silver nanoparticles (AgNPs) were biosynthesized using Fortunella Japonica extract as an reducing agent through a rapidly and ecofriendly assisted ultrasound method. Effect of ultrasound assistant on synthesis duration, properties and antibacterial activity of AgNPs against Escherichia coli, Bacillus subtilis and Bacillus cereus were reported. The suitable duration for AgNPs assisted ultrasound biosynthesis was 90 minutes that is 60 minutes shorter than stirring-assisted method. The obtained AgNPs with a face centred cubic structure were nearly spherical in shape and uniform in size distribution with the average nanosize of 11.6 nm, being smaller than the size of AgNPs prepared by stirring-assisted method. AgNPs sample exhibited effective antibacterial activity against all three bacteria with average diameter of inhibition zones of over 15 mm and minimum inhibitory concentration of 4.13 µg/mL. The results showed that the ultrasound assistant has positive effects such as shortening synthesis duration, reducing average particle size and increasing antibacterial activity of AgNPs.

Synthesis, Characteristics, Oil Adsorption, and Thermal Insulation Performance of Cellulosic Aerogel Derived fromWater Hyacinth

“…Aerogel materials have been studied and synthesized for a long time and used in many different fields, such as insulation material, nanocomposites, biomaterials, paper, packaging, filtration membranes, − and absorption of oil spills. , They are low-density, nanostructured porous materials with very low thermal conductivity, excellent acoustic insulation properties, high mechanical strength, low density, large specific surface area, and high porosity. − Aerogel materials have been synthesized from inorganic, organic, and inorganic–organic hybrid raw materials, such as resorcinol–formaldehyde, melamine–formaldehyde, silicon (SiO 2 ), alumina (Al 2 O 3 ), titania (TiO 2 ), zirconia (ZrO 2 ), and other oxides . However, these materials have disadvantages, such as deformation and difficult synthesis with high-cost processes that consume many chemicals that are released into the environment. − More recently, biobased aerogels fabricated from agricultural sources have attracted attention, with some positive results. − The process of synthesizing cellulose aerogel materials from agricultural waste, with enhanced cross-linking to improve mechanical properties, is now the subject of study and has solved the above problems …”

A Novel Electrochemical Modification Combined with Heat Treatment for Production of Ag NPs and Efficient Antibacterial Ag NPs-Coated Nonwoven Fabrics

“…25) The antibacterial activity of Ag NPs depends on the conditions, size, shape and surfactants, as well as strains and concentration of bacteria, and testing methods. [26][27][28] It is worth noting that the concentration of bacteria in our test was very high (10 7 CFU/ml), whereas the test typically uses only 10 2 -10 6 CFU/ml. 24,25)…”

Facile Green Synthesis of Ag/Agcl Nanocomposite Using Durian Shell Extract and Its Activity Against Methicillin-Resistant Staphylococcus Aureus;

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