Prabhakara Rao Dasari; Sofia Pilli; Ravi Jon
Abstract
The present work reports an ecofriendly method for biosynthesis of AgNPs using an aqueous leaves extracts of Carissa carandas and Nerium indicum plants. These extracts play a significant role for the formation of AgNPs. The obtained AgNPs were characterized by Ultraviolet–Visible Spectrophotometry. ...
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The present work reports an ecofriendly method for biosynthesis of AgNPs using an aqueous leaves extracts of Carissa carandas and Nerium indicum plants. These extracts play a significant role for the formation of AgNPs. The obtained AgNPs were characterized by Ultraviolet–Visible Spectrophotometry. The UV-spectrum showed that the absorbance peak at 440 nm. TEM analysis shown morphology and crystalline of nanoparticles as 20 and 40 nm sizes and spherical shape. The SEM and EDXA analysis was shown identify elemental composition and confirm the NPs of desired elements. The FTIR analysis showed functional group elements as amide, hydroxyl and amino groups in NPs. These results were confirming the AgNPs have been best activity against human pathogens. The AgNPs showed high potential antibacterial activity toward the selected pathogenic bacteria. Therefore, Carissa carandas and Nerium indicum leaves aqueous extract AgNPs can provide application in future development as nano-medicine, nanotechnology as antifungal activity on Aspergillus niger and candida albicans and then anticancer activity on MCF-7 cell line. Finally, the Nerium indicum leaves aqueous extract AgNPs were more effective in antibacterial, antifungal and anticancer activity than Carissa carandas AgNPs.
Alagan Jeevika; Raj Sarika; Dhesingh Ravi Shankaran
Abstract
In this work, we have investigated the uses of herbal extract of Terminalia bellerica (T.bellerica) as an efficient reducing as well as capping agent for reliable green synthesis of silver nanoparticles (AgNPs) at room temperature. HR-TEM results of AgNPs confirmed that, the nanoparticles are spherical ...
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In this work, we have investigated the uses of herbal extract of Terminalia bellerica (T.bellerica) as an efficient reducing as well as capping agent for reliable green synthesis of silver nanoparticles (AgNPs) at room temperature. HR-TEM results of AgNPs confirmed that, the nanoparticles are spherical in shape with an average diameter of ~30 ± 6 nm. XRD shows that, AgNPs exhibits the face centered cubic (FCC) structure. AgNPs utilized as a nanosensor probe for detection of mercury ions (Hg 2+ ). AgNPs showed a color change from brownish yellow to colorless on exposed to Hg 2+ due to the redox reaction of mercury and silver. This sensor probe showed a lower limit of detection of 0.3 ± 0.005 µM. Selectivity of the sensor has been evaluated towards other environmentally heavy metal ions and found that, this sensor is highly selective to Hg 2+ . AgNPs loaded poly (vinylalcohol) (PVA) films and nanofibers were fabricated by solvent casting and electrospinning methods, respectively. AgNPs loaded PVA films and nanofibers were tested for anti-bacterial studies against E. coli and B. subtils. The results indicate that the green synthesized AgNPs possess high microbial activity towards E.coli. These AgNPs based functional materials have great potential for application in sensors, anti-microbial coatings, wound dressing and smart textiles.
Naheed Ahmad; Seema Sharma;Radheshyam Rai
Abstract
We present a simple and eco-friendly biosynthesis of silver nanoparticles using Pomegranate peel extract as the reducing agent. Peel extract of Pomegranate was challenged with silver nitrate (AgNO3) and chloroauric acid (HAuCl4) solution for the production of silver nanoparticles (AgNPs) and gold nanoparticles ...
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We present a simple and eco-friendly biosynthesis of silver nanoparticles using Pomegranate peel extract as the reducing agent. Peel extract of Pomegranate was challenged with silver nitrate (AgNO3) and chloroauric acid (HAuCl4) solution for the production of silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs), respectively. The reaction process was simple for the formation of highly stable silver and gold nanoparticles at room temperature by using the biowaste of the fruit. The morphology and crystalline phase of the NPs were determined from UV-Vis spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED) and X-ray diffraction (XRD) spectra. TEM studies showed that the average particle size of silver nanoparticles were 5 ±1.5 nm whereas the gold nanoparticles were found to be 10 ±1.5 nm. An effort has been also been made to understand the possible involved mechanism for the biosynthesis of the NPs. Presumably biosynthetic products or reduced cofactors play an important role in the reduction of respective salts to nanoparticles.