Retraction notice to Biosynthesis of Clinacanthus nutans Lindau leaf extract mediated ag NPs, au NPs and their comparative strong muscle relaxant, analgesic activities for pain management in nursing care for using in intensive nursing care unit

AbstractGreen fabrication of metal nanoparticles (NPs), using natural reducing and stabilizing agents existed in plants and their derivatives, due to their unique properties, has gained more attention. The present study focuses on the synthesis of gold (Au), silver (Ag) and selenium (Se) NPs using coffee bean extract under hydrothermal conditions (1.5 atm and 121°C, for 15 min). Coffee bean extract obtained in 2 h processing using Clevenger apparatus and Fourier transform-infrared (FT-IR) spectroscopy indicated five highlighted peaks, namely, hydroxyl, amide, aromatic, alkane and ring groups. Dynamic light scattering analysis revealed that among three different NPs formed, fabricated Ag NPs had small particle size (153 nm) and high zeta potential value (16.8 mV). However, synthesized Au NPs had minimum polydispersity index (0.312). Results also indicated that fabricated Au, Se and Ag NPs had low antioxidant activity with values of 9.1, 8.9 and 8.7%, respectively. Morphological and antibacterial activity assessments, demonstrated that synthesized Ag, Au and Se NPs had spherical shape and high bactericidal activity against E. coli and S. aurous. Obtained results indicated that the synthesized NPs, can be utilized in various areas.

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State-of-art of silver and gold nanoparticles synthesis routes, characterization and applications: a review

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2021-3084 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Faisal Ali ◽

Muhammad Hamza ◽

Munawar Iqbal ◽

Beriham Basha ◽

Norah Alwadai ◽

...

Keyword(s):

Electron Microscope ◽

X Rays ◽

Ag Nps ◽

Au Nps ◽

Advantages And Disadvantages ◽

Transmission Electron ◽

Synthesis Properties ◽

Synthesis Routes ◽

Synthesis Approach ◽

Comprehensive Study

Abstract To date, the noble metal-based nanoparticles have been used in every field of life. The Au and Ag nanoparticles (NPs) have been fabricated employing different techniques to tune the properties. In this study, the methodologies developed and adopted for the fabrication of Au and Ag have been discussed, which include physical, chemical and biological routes. The Au and Ag characteristics (morphology, size, shape) along with advantages and disadvantages are discussed. The Au and Ag NPs catalytic and biomedical applications are discussed. For the Ag and Au NPs characterization, SEM (scanning electron microscope), TEM (transmission electron microscope), FTIR (Fourier transform infra-red spectroscopy), XRD (X-rays diffraction) and DLS (dynamic light scattering) techniques are employed. The properties of Au and Ag NPs found dependent to synthesis approach, i.e., the size, shape and morphologies, which showed a promising Catalytic, drug delivery and antimicrobial agent applications. The review is a comprehensive study for the comparison of Au and Ag NPs synthesis, properties and applications in different fields.

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Microwave-Assisted Green Synthesis of Silver Nanoparticles Using Juglans regia Leaf Extract and Evaluation of Their Physico-Chemical and Antibacterial Properties

Antibiotics ◽

10.3390/antibiotics7030068 ◽

2018 ◽

Vol 7 (3) ◽

pp. 68 ◽

Cited By ~ 8

Author(s):

Mahsa Eshghi ◽

Hamideh Vaghari ◽

Yahya Najian ◽

Mohammad Najian ◽

Hoda Jafarizadeh-Malmiri ◽

...

Keyword(s):

Silver Nanoparticles ◽

Leaf Extract ◽

Juglans Regia ◽

Antibacterial Properties ◽

Infrared Analysis ◽

Ag Nps ◽

Stabilizing Agents ◽

Agno3 Solution ◽

Transmission Electron ◽

Vis Spectroscopy

Silver nanoparticles (Ag NPs) were synthesized using Juglans regia (J. regia) leaf extract, as both reducing and stabilizing agents through microwave irradiation method. The effects of a 1% (w/v) amount of leaf extract (0.1–0.9 mL) and an amount of 1 mM AgNO3 solution (15–25 mL) on the broad emission peak (λmax) and concentration of the synthesized Ag NPs solution were investigated using response surface methodology (RSM). Fourier transform infrared analysis indicated the main functional groups existing in the J. regia leaf extract. Dynamic light scattering, UV-Vis spectroscopy and transmission electron microscopy were used to characterize the synthesized Ag NPs. Fabricated Ag NPs with the mean particle size and polydispersity index and maximum concentration and zeta potential of 168 nm, 0.419, 135.16 ppm and −15.6 mV, respectively, were obtained using 0.1 mL of J. regia leaf extract and 15 mL of AgNO3. The antibacterial activity of the fabricated Ag NPs was assessed against both Gram negative (Escherichia coli) and positive (Staphylococcus aureus) bacteria and was found to possess high bactericidal effects.

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Au-on-Ag nanostructure for in-situ SERS monitoring of catalytic reactions

Nanotechnology ◽

10.1088/1361-6528/ac47d2 ◽

2022 ◽

Author(s):

Shuyue He ◽

Di Wu ◽

Siwei Chen ◽

Kai Liu ◽

Eui-Hyeok Yang ◽

...

Keyword(s):

Catalytic Activity ◽

Thermal Evaporation ◽

Reduction Process ◽

Ag Nps ◽

Au Nps ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering ◽

Raman Probe

Abstract Dual-functionality Au-on-Ag nanostructures (AOA) were fabricated on a silicon substrate by first immobilizing citrate-reduced Ag nanoparticles (Ag NPs, ~43 nm in diameter), followed by depositing ~7 nm Au nanofilms (Au NFs) via thermal evaporation. Au NFs were introduced for their catalytic activity in concave-convex nano-configuration. Ag NPs underneath were used for their significant enhancement factor (EF) in surface-enhanced Raman scattering (SERS)-based measurements of analytes of interest. Rhodamine 6G (R6G) was utilized as the Raman-probe to evaluate the SERS sensitivity of AOA. The SERS EF of AOA is ~37 times than that of Au NPs. Using reduction of 4-nitrothiophenol (4-NTP) by sodium borohydride (NaBH4) as a model reaction, we demonstrated the robust catalytic activity of AOA as well as its capacity to continuously monitor via SERS the disappearance of reactant 4-NTP, emergence and disappearance of intermediate 4, 4’-DMAB, and the appearance of product 4-ATP throughout the reduction process in real-time and in situ.

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Evaluation of anti-inflammatory and analgesic activities of methanolic leaf extract of the endangered tree species, Hildegardia populifolia (Roxb.) Schott and Endl

International Journal of Green Pharmacy ◽

10.4103/0973-8258.155062 ◽

2015 ◽

Vol 9 (2) ◽

pp. 125 ◽

Cited By ~ 6

Author(s):

Paulsamy Subramanium ◽

Saradha Maran

Keyword(s):

Tree Species ◽

Leaf Extract ◽

Endangered Tree ◽

Endangered Tree Species ◽

Anti Inflammatory ◽

Analgesic Activities

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Marine Bacterial Exopolymers-Mediated Green Synthesis of Noble Metal Nanoparticles with Antimicrobial Properties

Polymers ◽

10.3390/polym11071157 ◽

2019 ◽

Vol 11 (7) ◽

pp. 1157 ◽

Cited By ~ 7

Author(s):

Angela Scala ◽

Anna Piperno ◽

Alexandru Hada ◽

Simion Astilean ◽

Adriana Vulpoi ◽

...

Keyword(s):

Hydrothermal Vents ◽

Thermophilic Bacteria ◽

Silver Chloride ◽

Antimicrobial Properties ◽

Biological Evaluation ◽

Noble Metal Nanoparticles ◽

Ag Nps ◽

Au Nps ◽

Minimum Fungicidal Concentration ◽

Gold Silver

A straightforward and green method for the synthesis of gold, silver, and silver chloride nanoparticles (Au NPs and Ag/AgCl NPs) was developed using three different microbial exopolymers (EP) as reducing and stabilizing agents. The exopolysaccharides EPS B3-15 and EPS T14 and the poly-γ-glutamic acid γ-PGA-APA were produced by thermophilic bacteria isolated from shallow hydrothermal vents off the Eolian Islands (Italy) in the Mediterranean Sea. The production of metal NPs was monitored by UV−Vis measurements by the typical plasmon resonance absorption peak and their antimicrobial activity towards Gram-positive and Gram- negative bacteria (Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa), as well as fungi (Candida albicans) was investigated. The biological evaluation showed no activity for EP-Au NPs, except against E. coli, whereas EP-Ag NPs exhibited a broad-spectrum of activity. The chemical composition, morphology, and size of EP-Ag NPs were investigated by UV–Vis, zeta potential (ζ), dynamic light scattering (DLS) measurements and transmission electron microscopy (TEM). The best antimicrobial results were obtained for EPS B3-15-Ag NPs and EPS T14-Ag NPs (Minimum Inhibitory Concentration, MIC: 9.37–45 µg/mL; Minimum Bactericidal Concentration/Minimum Fungicidal Concentration, MBC/MFC: 11.25–75 µg/mL).

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Subacute Oral Administration of Clinacanthus nutans Ethanolic Leaf Extract Induced Liver and Kidney Toxicities in ICR Mice

Molecules ◽

10.3390/molecules25112631 ◽

2020 ◽

Vol 25 (11) ◽

pp. 2631

Author(s):

Abdullahi Aliyu ◽

Mohd Rosly Shaari ◽

Nurul Syahirah Ahmad Sayuti ◽

Mohd Farhan Hanif Reduan ◽

Shanmugavelu Sithambaram ◽

...

Keyword(s):

Oral Administration ◽

Leaf Extract ◽

Lethal Dose ◽

Toxicity Study ◽

Oral Gavage ◽

Subacute Toxicity ◽

Icr Mice ◽

Clinacanthus Nutans ◽

Group B ◽

Ethanolic Leaf Extract

This study investigated the leaves of Clinacanthus nutans for its bioactive compounds and acute and subacute toxicity effects of C. nutans ethanolic leaf extract (CELE) on blood, liver and kidneys of ICR mice. A total of 10 8-week-old female mice were divided into groups A (control) and B (2000 mg/kg) for the acute toxicity study. A single dose of 2000 mg/kg was administered to group B through oral gavage and mice were monitored for 14 days. In the subacute toxicity study, mice were divided into five groups: A (control), B (125 mg/kg), C (250 mg/kg), D (500 mg/kg) and E (1000 mg/kg). The extract was administered daily for 28 days via oral gavage. The mice were sacrificed, and samples were collected for analyses. Myricetin, orientin, isoorientin, vitexin, isovitexin, isookanin, apigenin and ferulic acid were identified in the extract. Twenty-eight days of continuous oral administration revealed significant increases (p < 0.05) in creatinine, ALT and moderate hepatic and renal necrosis in groups D and E. The study concluded that the lethal dose (LD50) of CELE in mice is greater than 2000 mg/kg and that repeated oral administrations of CELE for 28 days induced hepatic and renal toxicities at 1000 mg/kg in female ICR mice.

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