Electroanalytical techniques

Francis, Sijo; Koshy, Ebey P.; Mathew, Beena

doi:10.1016/b978-0-12-820558-7.00004-2

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…The amount of hemoglobin released from erythrocytes after treatment with functionalized SeNPs determines its toxicity. Protocol for this assay was carried out as per the previously reported protocol by [38]. Human blood was centrifuged at 1500 ×g for 5 minutes and plasma was discarded to collect the erythrocytes (RBCs).…”

Section: Hemolytic Assaymentioning

confidence: 99%

Curcumin Coated Orthosiphon Stamineus Leaf Extract Based Selenium Nanoparticle for Potential Tissue Engineering Applications

Priya Veeraraghavan,

S.B,

et al. 2023

TIJPH

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Curcumin is a type of polyphenol phytochemical that is bright yellow in colour and produced by the plant Curcuma longa. Despite its pharmacological properties, curcumin has low bioavailability, poor solubility, and undergoes rapid degradation. Nanoparticles (NPs) are used as a nanocarrier for drug delivery, to improve the stability and pharmacokinetics of the drug. Therefore, by coating curcumin over selenium NPs (SeNPs), the bioactivity, bioavailability, stability, and may increase the solubility of curcumin of SeNPs. This study aimed to synthesize the SeNPs from Orthosiphon stamineus leaf extract and coat it with curcumin and to characterize it and check its biocompatibility. Biosynthesis of SeNPs was carried out using plant extract of Evolvulus alsinoides and characterized using UV spectrophotometer, FT-IR, and SEM. Annexin V PI apoptotic and Hemolytic assay were used for checking biocompatibility. The UV-Vis spectrum gave a strong peak at 265 and 423 nm at various time intervals, indicating the SeNPs formation. Similarly, FT-IR has strong absorption bands at 3279, 1284, 1072, 1028, and cm−1 with wavelengths ranging from 4000-500 cm-1. SEM analysis of biosynthesized SeNPs showed a spherical shape. Our results suggest that curcumin-coated SeNPs possess greater biocompatibility towards PBMCs which was evaluated by Annexin V - PI assay and erythrocytes by hemolytic studies. Curcumin-coated Selenium nanoparticles were successfully synthesized by the biological method using leaf extract of Orthosiphon stamineus and reported as biocompatible using Flow cytometry. But a more detailed study should be done for implementing it in tissue engineering. Keywords: Selenium nanoparticle, Curcumin, Orthosiphon stamineus, Tissue Engineering.

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Section: Hemolytic Assaymentioning

confidence: 99%

Curcumin Coated Orthosiphon Stamineus Leaf Extract Based Selenium Nanoparticle for Potential Tissue Engineering Applications

Priya Veeraraghavan,

S.B,

et al. 2023

TIJPH

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“…Sendo i a corrente medida, ik a corrente cinética e id a corrente de difusão. Com isso a corrente de difusão na segunda igualdade, pode ser reescrita pela multiplicação da raiz quadrada da velocidade de rotação do eletrodo (𝑤 Sendo, n é o número de elétrons, F é a constante de Faraday, A a área do disco do eletrodo, D é o coeficiente de difusão do gás oxigênio (O2), 𝜐 a viscosidade da solução do eletrólito de suporte, 𝐶 𝑂2 a concentração de O2 dissolvido no eletrólito de suporte e k sendo a constante de velocidade da RRO [61,62] .…”

Section: Voltametria De Varredura Linear Hidrodinâmica (Lsv)unclassified

“…A combinação de LSV com eletrodos RRDE é capaz de gerar perfis gráficos que fornecem informações com relação as reações redox, envolvendo a influência de três fatores como, a taxa de transferência de elétrons, a reatividade das espécies químicas eletroativas e a taxa de varredura de potencial. Além disso a cinética da reação de redução do oxigênio (RRO) pode ser estimada com base nos perfis gerados pela LSV, assim como a densidade de corrente limitante, densidade de corrente cinética, massa e atividade específica [54,62,63] .…”

Section: Voltametria De Varredura Linear Hidrodinâmica (Lsv)unclassified

Estudo da reação de redução do oxigênio em matriz de carbono XE2B modificado com átomos de O, N, S e P para eletrogeração de H>sub<2>/sub<O>sub<2>/sub<>i< in situ>/i<

Madalena¹

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Hydrogen peroxide (H2O2) is an important oxidizing agent used in many industrial and domestic processes and in wastewater treatment. When produced on an industrial scale, it presents serious logistical and safety constraints related to its handling and storage. In this context, the development and feasibility of new technologies capable of generating H2O2 close to where it will be consumed has become increasingly necessary. As a promising alternative, the electrosynthesis of H2O2 at adjustable concentrations through the selective oxygen reduction reaction (ORR) has received enormous attention in recent years. In this regard, the present study aimed to produce new electrocatalyst materials for in situ electrogenation of H2O2 from the functionalization of commercially available carbonaceous material (Printex XE2B carbon. The XE2B carbon was modified using the hydrothermal chemical doping technique and co-doping with the elements N, O, S and/or P. The newly produced electrocatalysts were physicochemically characterized using CNHS/O elemental analysis, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (MET), Contact Angle, X-ray Excited Photoelectron (XPS) and Raman spectroscopy techniques. The catalyst activity and selectivity for H2O2 production exhibited by the synthesized materials were investigated by cyclic voltammetry and linear scanning voltammetry techniques using rotating ring disc electrodes (RRDE) and gaseous diffusion electrodes (EDG). Of the materials studied, the N/XE2B catalyst showed high efficiency for H2O2 production compared to XE2B, O/XE2B, N,S/XE2B and N,P/XE2B. The selectivity of N/XE2B was 94% for H2O2 electrogenation exhibiting better activity in terms of potentials with onset to RRO of 560 mV compared to XE2B (SH2O2~80%) for hydrogen peroxide production. Other results quite relevant to the study were obtained by applying XE2B* (no change), XE2B and N/XE2B materials for the generation of H2O2 from the use of the gaseous diffusion electrode (EDG). The results obtained after the electrolysis time of 180 min reflected for the following order of efficiency: N/XE2B > XE2B* > XE2B. In view of the increased catalytic efficiency for H2O2 in situ using EDG it can be stated that the expressive results for the synthesized N/XE2B catalyst, demonstrated high efficiency for H2O2 production and good performance for RRO selectivity via 2e -.

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Computational simulation with experimental result correlation of organophosphate pesticides: Fenthion, Fenamiphos, and Azamethiphos

Costa,

Lima,

Codognoto

et al. 2024

J Solid State Electrochem

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Electroanalytical techniques

Cited by 5 publications

References 40 publications

Curcumin Coated Orthosiphon Stamineus Leaf Extract Based Selenium Nanoparticle for Potential Tissue Engineering Applications

Curcumin Coated Orthosiphon Stamineus Leaf Extract Based Selenium Nanoparticle for Potential Tissue Engineering Applications

Estudo da reação de redução do oxigênio em matriz de carbono XE2B modificado com átomos de O, N, S e P para eletrogeração de H>sub<2>/sub<O>sub<2>/sub<>i< in situ>/i<

Computational simulation with experimental result correlation of organophosphate pesticides: Fenthion, Fenamiphos, and Azamethiphos

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