Abstract:Silver nanoparticles (AgNPs) are among the most widely synthesized and used nanoparticles (NPs). AgNPs have been traditionally synthesized from plant extracts, cobwebs, microorganisms, etc. However, their synthesis from wing extracts of common insect; Mang mao which is abundantly available in most of the Asian countries has not been explored yet. We report the synthesis of AgNPs from M. mao wings extract and its antioxidant and antimicrobial activity. The synthesized AgNPs were spherical, 40–60 nm in size and … Show more
“…Notably, the proteins present in the seaweed could bind to the AgNPs via free amine groups, stabilizing clustered nanoparticles through surface-bound proteins [ 38 ]. The present results are also strongly supported by the findings presented in previous studies [ 6 , 16 , 39 ].…”
Section: Resultssupporting
confidence: 93%
“…Natural, engineered, or chemically derived nanoparticles (NPs) are typically ≤100 nm in size and possess unique biophysicochemical properties, such as surface functionalization, an abundant surface-to-volume ratio, target specificity, and controlled release in relative to similar bulk materials. The unique properties of nanoparticles make them suitable for potential applications in cosmetics, biomedicines, and agriculture [ 5 , 6 ]. Notably, the synthesis of both metal and nonmetal nanoparticles by the use of extracts from both plants and microorganisms has become more prevalent than previous chemical and physical synthesis technologies.…”
Green-based synthesis of metal nanoparticles using marine seaweeds is a rapidly growing technology that is finding a variety of new applications. In the present study, the aqueous extract of a marine seaweed, Gracilaria edulis, was employed for the synthesis of metallic nanoparticles without using any reducing and stabilizing chemical agents. The visual color change and validation through UV-Vis spectroscopy provided an initial confirmation regarding the Gracilaria edulis-mediated green synthesized silver nanoparticles. The dynamic light scattering studies and high-resolution transmission electron microscopy pictographs exhibited that the synthesized Gracilaria edulis-derived silver nanoparticles were roughly spherical in shape having an average size of
62.72
±
0.25
nm and surface zeta potential of -
15.6
±
6.73
mV. The structural motifs and chemically functional groups associated with the Gracilaria edulis-derived silver nanoparticles were observed through X-ray diffraction and attenuated total reflectance Fourier transform infrared spectroscopy. Further, the synthesized nanoparticles were further screened for their antioxidant properties through DPPH, hydroxyl radical, ABTS, and nitric oxide radical scavenging assays. The phycosynthesized nanoparticles exhibited dose-dependent cytotoxicity against MDA-MB-231 breast carcinoma cells having IC50 value of
344.27
±
2.56
μg/mL. Additionally, the nanoparticles also exhibited zone of inhibition against pathogenic strains of Bacillus licheniformis (MTCC 7425), Salmonella typhimurium (MTCC 3216), Vibrio cholerae (MTCC 3904), Escherichia coli (MTCC 1098), Staphylococcus epidermidis (MTCC 3615), and Shigella dysenteriae (MTCC9543). Hence, this investigation explores the reducing and stabilizing capabilities of marine sea weed Gracilaria edulis for synthesizing silver nanoparticles in a cost-effective approach with potential anticancer and antimicrobial activity. The nanoparticles synthesized through green method may be explored for their potential utility in food preservative film industry, biomedical, and pharmaceutical industries.
“…Notably, the proteins present in the seaweed could bind to the AgNPs via free amine groups, stabilizing clustered nanoparticles through surface-bound proteins [ 38 ]. The present results are also strongly supported by the findings presented in previous studies [ 6 , 16 , 39 ].…”
Section: Resultssupporting
confidence: 93%
“…Natural, engineered, or chemically derived nanoparticles (NPs) are typically ≤100 nm in size and possess unique biophysicochemical properties, such as surface functionalization, an abundant surface-to-volume ratio, target specificity, and controlled release in relative to similar bulk materials. The unique properties of nanoparticles make them suitable for potential applications in cosmetics, biomedicines, and agriculture [ 5 , 6 ]. Notably, the synthesis of both metal and nonmetal nanoparticles by the use of extracts from both plants and microorganisms has become more prevalent than previous chemical and physical synthesis technologies.…”
Green-based synthesis of metal nanoparticles using marine seaweeds is a rapidly growing technology that is finding a variety of new applications. In the present study, the aqueous extract of a marine seaweed, Gracilaria edulis, was employed for the synthesis of metallic nanoparticles without using any reducing and stabilizing chemical agents. The visual color change and validation through UV-Vis spectroscopy provided an initial confirmation regarding the Gracilaria edulis-mediated green synthesized silver nanoparticles. The dynamic light scattering studies and high-resolution transmission electron microscopy pictographs exhibited that the synthesized Gracilaria edulis-derived silver nanoparticles were roughly spherical in shape having an average size of
62.72
±
0.25
nm and surface zeta potential of -
15.6
±
6.73
mV. The structural motifs and chemically functional groups associated with the Gracilaria edulis-derived silver nanoparticles were observed through X-ray diffraction and attenuated total reflectance Fourier transform infrared spectroscopy. Further, the synthesized nanoparticles were further screened for their antioxidant properties through DPPH, hydroxyl radical, ABTS, and nitric oxide radical scavenging assays. The phycosynthesized nanoparticles exhibited dose-dependent cytotoxicity against MDA-MB-231 breast carcinoma cells having IC50 value of
344.27
±
2.56
μg/mL. Additionally, the nanoparticles also exhibited zone of inhibition against pathogenic strains of Bacillus licheniformis (MTCC 7425), Salmonella typhimurium (MTCC 3216), Vibrio cholerae (MTCC 3904), Escherichia coli (MTCC 1098), Staphylococcus epidermidis (MTCC 3615), and Shigella dysenteriae (MTCC9543). Hence, this investigation explores the reducing and stabilizing capabilities of marine sea weed Gracilaria edulis for synthesizing silver nanoparticles in a cost-effective approach with potential anticancer and antimicrobial activity. The nanoparticles synthesized through green method may be explored for their potential utility in food preservative film industry, biomedical, and pharmaceutical industries.
“…Subsequently, the prepared NCs, within such time, didn’t exhibit aggregation and were still stable. Additionally, several reports 35 , 36 synthesized AgNPs and other metal-NPs in the same range of zeta and also exhibited antimicrobial activity. Figure 5 ( a ) Zeta potential and ( b ) Fluorescence emission spectrum of Ag@Ag 2 O NCs.…”
Microbial contamination is one of the major dreadful problems that raises hospitalization, morbidity and mortality rates globally, which subsequently obstructs socio-economic progress. The continuous misuse and overutilization of antibiotics participate mainly in the emergence of microbial resistance. To circumvent such a multidrug-resistance phenomenon, well-defined nanocomposite structures have recently been employed. In the current study, a facile, novel and cost-effective approach was applied to synthesize Ag@Ag2O core–shell nanocomposites (NCs) via chemical method. Several techniques were used to determine the structural, morphological, and optical characteristics of the as-prepared NCs. XRD, Raman, FTIR, XPS and SAED analysis revealed a crystalline hybrid structure of Ag core and Ag2O shell. Besides, SEM and HRTEM micrographs depicted spherical nanoparticles with size range of 19–60 nm. Additionally, zeta potential and fluorescence spectra illustrated aggregated nature of Ag@Ag2O NCs by − 5.34 mV with fluorescence emission peak at 498 nm. Ag@Ag2O NCs exhibited higher antimicrobial, antibiofilm, and algicidal activity in dose-dependent behavior. Interestingly, a remarkable mycocidal potency by 50 μg of Ag@Ag2O NCs against Candida albican; implying promising activity against COVID-19 white fungal post-infections. Through assessing cytotoxicity, Ag@Ag2O NCs exhibited higher safety against Vero cells than bulk silver nitrate by more than 100-fold.
“…The insecticidal activity explored using the nanoparticles exhibited significant effect of these biologically synthesized AgNPs at 100 μg/ml concentrations on Aphis gossypii, an agricultural pest known by the common names cotton aphid and melon aphid. Jakinala et al (2021) developed an eco-friendly and cost-effective method for the biosynthesis of AgNPs using wings extract of M. mao (winged termite) and evaluated their antioxidant and antimicrobial activity. The insect wings were hydrolyzed in 100 mM sodium hydroxide at 90 C for an hour.…”
There has been a recent interest in the biosynthesis of nanoparticles using animal systems. Several parts of animals and/or their extracts can serve as good reducing agents for the production of nanoparticle. Animal derivatives like wings of insects, honey and propolis from honeybees, spider silk, nests of paper wasp, wasp venom, silk fibroin, and silk sericin from silkworm have increasingly been explored in the last decade. Different components of chicken eggs like yolk, egg white, and egg shells have also shown promising results. Recently a number of studies have been conducted that utilized different species of earthworms in nanofabrication process. This area requires a lot of consistent efforts since most of the members of animal kingdom have not been explored till now. Urgent efforts are needed to develop this area and enrich the scant knowledge available till date for better utilization in green nanobiotechnology.
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