Tuning of the surface structure of silver nanoparticles using Gum arabic for enhanced electrocatalytic oxidation of morin

Agnihotri, Ananya S.; Nidhin, Marimuthu; Rison, Sherin; Akshaya, K. B.; Varghese, Anitha

doi:10.1016/j.apsadv.2021.100181

Cited by 14 publications

(10 citation statements)

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“…As for the FTIR spectrum of AG, the characteristic bands at 1049 cm −1 were believed to be due to C-O stretching of the primary alcohol, the band at 1634 cm −1 was associated with the asymmetric and symmetric stretching of the COO− domain, and that at 3308 cm −1 was due to hydrogen bonding. All the characteristics of bands mentioned agreed closely with the studies of Olajire and Bamigbade [ 26 ], Eddarai et al [ 27 ], Xu et al [ 28 ], Agnihotri et al [ 29 ], and Liu et al [ 30 ]. Figure S2 (supplementary materials) shows the TGA curves describing the thermal stability of CT and AG conducted at room temperature (25 °C) to 700 °C.…”

Section: Resultssupporting

confidence: 87%

Pickering Emulsions Stabilized by Chitosan/Natural Acacia Gum Biopolymers: Effects of pH and Salt Concentrations

et al. 2022

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In this study, chitosan (CT) and naturally occurring acacia gum (AG) blends were employed as emulsifiers to form a series of emulsions developed from diesel and water. Effects of pH level (3, 5, 10, and 12) and various NaCl salt concentrations (0.25–1%) on the stability, viscosity, and interfacial properties of CT-(1%)/AG-(4%) stabilized Pickering emulsions were evaluated. Bottle test experiment results showed that the stability indexes of the CT/AG emulsions were similar under acidic (3 and 5) and alkaline (10 and 12) pH media. On the other hand, the effects of various NaCl concentrations on the stability of CT-(1%)/AG-(4%) emulsion demonstrated analogous behavior throughout. From all the NaCl concentrations and pH levels examined, viscosities of this emulsion decreased drastically with the increasing shear rate, indicating pseudoplastic fluid with shear thinning characteristics of these emulsions. The viscosity of CT-(1%)/AG-(4%) emulsion increased at a low shear rate and decreased with an increasing shear rate. The presence of NaCl salt and pH change in CT/AG solutions induced a transformation in the interfacial tension (IFT) at the diesel/water interface. Accordingly, the IFT values of diesel/water in the absence of NaCl/CT/AG (without emulsifier and salt) remained fairly constant for a period of 500 s, and its average IFT value was 26.16 mN/m. In the absence of salt, the addition of an emulsifier (CT-(1%)/AG-(4%)) reduced the IFT to 16.69 mN/m. When the salt was added, the IFT values were further reduced to 12.04 mN/m. At low pH, the IFT was higher (17.1 mN/M) compared to the value of the IFT (10.8 mN/M) at high pH. The results obtained will help understand the preparation and performance of such emulsions under different conditions especially relevant to oil field applications.

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Section: Resultssupporting

confidence: 87%

Pickering Emulsions Stabilized by Chitosan/Natural Acacia Gum Biopolymers: Effects of pH and Salt Concentrations

et al. 2022

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“…The formation of a quinoid structure may account for the change in the CO band of the FTIR spectra. The keto‐enol tautomerism of morin may liberate electrons that reduce Ag + ions to AgNPs (Agnihotri et al, 2021). The redox reaction illustrates that one molecule of morin produces two electrons and subsequently reduces two Ag + ions.…”

Section: Resultsmentioning

confidence: 99%

Mass production of morin‐stabilized silver nanoparticles: Characterization, antioxidant, and antimicrobial activities

Zayed,

Abdel‐Monem,

Arafa

et al. 2023

Microscopy Res & Technique

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Phytochemical‐conjugated silver nanoparticles (AgNPs) are believed to act as a bridge between nanotechnology and therapy. There is a significant need for green and mass production of such materials due to their extensive applications, especially in the biomedical sector. In this study, morin‐stabilized silver nanoparticles (morin/AgNPs) were synthesized on a massive scale using a one‐pot solid‐state technique. The reaction is achieved by ball milling of morin and silver nitrate powders at ambient temperature without any solvent or toxic reagent. The prepared morin/AgNPs exhibited a semi‐hexagonal shape and ranged in size from 21 to 43 nm. The x‐ray diffraction results elucidated the formation of highly crystalline AgNPs. Fourier transform infrared and x‐ray photoelectron spectroscopic analyses prove that the hydroxyl, carbonyl, and aromatic functionalities in morin are playing major roles in the reduction and stabilization of AgNPs. The antioxidant potential of morin/AgNPs was evaluated utilizing 2,2‐Diphenyl‐1‐picryl‐hydrazyl (DPPH) assay. Morin/AgNPs exhibited better free radical scavenging activity (IC50 = 11.7 μg/mL) than morin (IC50 = 14.8 μg/mL). Furthermore, the synthesized AgNPs showed promising antimicrobial activity against Escherichia coli, Klebsiella pneumonia, Staphylococcus aureus, Streptococcus mutans, and Candida albicans. The largest inhibition zones were observed against S. aureus (21.2 ± 0.6 mm) and K. pneumonia (20.3 ± 0.5 mm) bacteria. The foregoing results highlighted the prospective application of morin/AgNPs as a promising antioxidant and antimicrobial material for safe medical applications.Research Highlights A simple green route for the large‐scale production of AgNPs was developed. Morin acts as reducing/stabilizing agent in solid‐state synthesis of AgNPs. Morin/AgNPs exhibited promising antimicrobial and antioxidant activity.

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“…From this point of view, the electrochemical approach allows the obtaining of the final coverage via several or even one electrochemical step [147,153,158,169,173,175,176] (Figure 15b). As one can see from Table 5, the linear response for nanomolar and lower concentrations has been achieved for morin [153,155] and hyperin [160][161][162] using an appropriate electrode surface modifier. Other antioxidants can be quantified at higher concentrations.…”

mentioning

confidence: 89%

“…As one can see from Table 5, the linear response for nanomolar and lower concentrations has been achieved for morin [153,155] and hyperin [160][161][162] using an appropriate electrode surface modifier. Other antioxidants can be quantified at higher concentrations.…”

mentioning

confidence: 89%

“…Regarding selectivity, the most impressive data were obtained using electrodes modified with molecularly imprinted polymers [158,172,174]. Although, other electrodes for flavonoids and phenolic acids determination [146][147][148][149][150][151][152][153][154][155][156][157][158][160][161][162][164][165][166][167][168][173][174][175]178] also show high selectivity in the presence of structurally related antioxidants that is caused by the type of modifier and conditions of electrochemical measurements (supporting electrolyte type and pH, electrochemical window, potential scan rate, etc. ).…”

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confidence: 99%

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Electrochemical Characterization of the Antioxidant Properties of Medicinal Plants and Products: A Review

Ziyatdinova

Kalmykova

2023

Molecules

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Medicinal plants are an important source of bioactive compounds with a wide spectrum of practically useful properties. Various types of antioxidants synthesized in plants are the reasons for their application in medicine, phytotherapy, and aromatherapy. Therefore, reliable, simple, cost-effective, eco-friendly, and rapid methods for the evaluation of antioxidant properties of medicinal plants and products on their basis are required. Electrochemical methods based on electron transfer reactions are promising tools to solve this problem. Total antioxidant parameters and individual antioxidant quantification can be achieved using suitable electrochemical techniques. The analytical capabilities of constant-current coulometry, potentiometry, various types of voltammetry, and chrono methods in the evaluation of total antioxidant parameters of medicinal plants and plant-derived products are presented. The advantages and limitations of methods in comparison to each other and traditional spectroscopic methods are discussed. The possibility to use electrochemical detection of the antioxidants via reactions with oxidants or radicals (N- and O-centered) in solution, with stable radicals immobilized on the electrode surface, via oxidation of antioxidants on a suitable electrode, allows the study of various mechanisms of antioxidant actions occurring in living systems. Attention is also paid to the individual or simultaneous electrochemical determination of antioxidants in medicinal plants using chemically modified electrodes.

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Tuning of the surface structure of silver nanoparticles using Gum arabic for enhanced electrocatalytic oxidation of morin

Cited by 14 publications

References 40 publications

Pickering Emulsions Stabilized by Chitosan/Natural Acacia Gum Biopolymers: Effects of pH and Salt Concentrations

Pickering Emulsions Stabilized by Chitosan/Natural Acacia Gum Biopolymers: Effects of pH and Salt Concentrations

Mass production of morin‐stabilized silver nanoparticles: Characterization, antioxidant, and antimicrobial activities

Electrochemical Characterization of the Antioxidant Properties of Medicinal Plants and Products: A Review

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