Role of capping agents in controlling silver nanoparticles size, antibacterial activity and potential application as optical hydrogen peroxide sensor

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 36171-36179 ◽  
Author(s):  
B. Ajitha ◽  
Y. Ashok Kumar Reddy ◽  
P. Sreedhara Reddy ◽  
Hwan-Jin Jeon ◽  
Chi Won Ahn
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Catalytic Reaction ◽  
Potential Application ◽  
Capping Agents ◽  
Optical Absorbance ◽  
Hydrogen Peroxide Sensor ◽  
Absorbance Spectra

Catalytic reaction between PVA-capped AgNPs and hydrogen peroxide, and the corresponding LSPR optical absorbance spectra as a function of time.

scholarly journals Molecular insight to influential role of Hha–TomB toxin–antitoxin system for antibacterial activity of biogenic silver nanoparticles

2018 ◽  
Vol 46 (sup3) ◽  
pp. S572-S584 ◽  
Author(s):  
Prajita Paul ◽  
SureshK. Verma ◽  
Pritam Kumar Panda ◽  
Sangeeta Jaiswal ◽  
Bikash R. Sahu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Biogenic Silver Nanoparticles

Humic Acid Functionalized - Silver Nanoparticles as Nanosensor for Colorimetric Detection of Copper (II) Ions in Aqueous Solutions

2020 ◽  
Vol 831 ◽  
pp. 142-150
Author(s):  
Edgar Clyde R. Lopez ◽  
Michael Angelo Zafra ◽  
Jon Nyner L. Gavan ◽  
Emil David A. Villena ◽  
Francis Eric P. Almaquer ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Humic Acid ◽  
Aqueous Solutions ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Hydrodynamic Diameter ◽  
Limit Of Quantification ◽  
Local Surface Plasmon Resonance ◽  
Optical Absorbance ◽  
Absorbance Spectra

Humic acid - functionalized silver nanoparticles (HA-AgNPs) were successfully synthesized and used to detect Cu (II) ions in aqueous solutions. The HA-AgNPs was shown to have an average hydrodynamic diameter of 101.4 nm and a polydispersity index of 0.447. The absorbance spectra of HA-AgNPs showed the characteristic local surface plasmon resonance (LSPR) peak of AgNPs at 408.3 nm. Addition of Cu (II) in the HA-AgNPs led to their agglomeration as evidenced by the change in their surface morphology and their corresponding optical absorbance spectra. The synthesized HA-AgNPs showed a strong linear response for Cu (II) concentrations in the range of 0.00 – 1.25 mM with a limit of detection (LoD) of 4.4428 ± 0.1091 mg L-1, a limit of quantification (LoQ) of 14.8094 ± 0.3636 mg L-1, and a limit of blank (LoB) of 0.1214 ± 0.0065 mg L-1. Statistical analysis showed that this calibration curve could be used to quantify Cu (II) concentrations within a 95% confidence level. Furthermore, HA-AgNPs was found to be selective for Cu (II) detection based on the selectivity study against common metal ions found in drinking water. This shows that the synthesized HA-AgNPs can be used as an environment-friendly colorimetric nanosensor for rapid and point-of-need quantification of Cu (II) ions in aqueous media.

Green synthesis of silver nanoparticles and their application for the development of optical fiber based hydrogen peroxide sensor

2013 ◽  
Vol 183 ◽  
pp. 144-149 ◽  
Author(s):  
Chandrakant K. Tagad ◽  
Sreekantha Reddy Dugasani ◽  
Rohini Aiyer ◽  
Sungha Park ◽  
Atul Kulkarni ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Optical Fiber ◽  
Green Synthesis ◽  
Hydrogen Peroxide Sensor

scholarly journals Biosynthesis and Antibacterial Activity of Silver Nanoparticles Using Yeast Extract as Reducing and Capping Agents

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mengjun Shu ◽  
Fengjiao He ◽  
Zhaohui Li ◽  
Xingzhong Zhu ◽  
Yujie Ma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Yeast Extract ◽  
Capping Agents

scholarly journals Environmentally benevolent synthesis and characterization of silver nanoparticles using Olea ferruginea Royle for antibacterial and antioxidant activities

2020 ◽  
Vol 9 (1) ◽  
pp. 451-461 ◽  
Author(s):  
Abid Hussain ◽  
Ansar Mehmood ◽  
Ghulam Murtaza ◽  
Khawaja Shafique Ahmad ◽  
Aneela Ulfat ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Antioxidant Activities ◽  
Cost Effective ◽  
Positive Control ◽  
Ag Nps ◽  
Stabilizing Agent ◽  
Mean Size ◽  
Spherical Crystals

AbstractIn this study, we reported an easy, rapid, cost-effective and environmentally benign method for the fabrication of silver nanoparticles (Ag-NPs) using Olea ferruginea as reducing, capping and stabilizing agent. For this, an aqueous extract of leaf and bark of O. ferruginea was treated with 1 mM AgNO3, which reduces Ag ions to Ag-NPs by establishing reddish brown color. The synthesized Ag-NPs were spherical crystals, with a mean size of 23 and 17 nm for leaf- and bark-mediated Ag-NPs, respectively. Fourier transform infrared spectroscopy affirmed the role of leaf and bark extracts of O. ferruginea as reducing, capping and stabilizing agent. These biosynthesized Ag-NPs showed profound antibacterial activity against Gram-negative (Pseudomonas aeruginosa and Escherichia coli) and Gram-positive (Streptococcus pneumonia and Staphylococcus aureus) bacteria. The highest antibacterial activity was shown by bark Ag-NPs against S. aureus (14.00 mm), while leaf Ag-NPs showed higher activity against S. pneumonia (13.00 mm). Additionally, they produced effective antioxidant activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) as compared to plant extracts and positive control. It was observed that the bark-mediated Ag-NPs had higher percentage (90%) of scavenging potential than the leaf-mediated Ag-NPs (78%). The significance of the current study is the synthesis of eco-friendly, easy and cost-effective Ag-NPs as biomedical products.

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