Synthesis and characterization of silver nanoparticles using reducing agents of bitter leaf (Vernonia amygdalina) extract and tri-sodium citrate

Tessema, Belete; Gonfa, Girma; Hailegiorgis, Sintayehu Mekuria; Sundramurthy, Venkatesa Prabhu; Manivannan, S.

doi:10.1016/j.nanoso.2023.100983

Cited by 17 publications

(2 citation statements)

References 44 publications

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“…The wave numbers 3338 and 3475 cm −1 were caused by the O-H bond stretching vibration from the Si-OH silanol groups and the adsorbed water molecules on the SiO 2 surface. The broadband was caused by O-H bond bending vibration at wave numbers of 1633 and 1645 cm −1 [7,52]. A strong and noticeable absorption peak can be found at wave number 1072 cm −1 , which was brought on by the asymmetric stretching of the Si-O-Si (siloxane) bonding.…”

Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 98%

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Tessema,

Gonfa,

Hailegiorgis

et al. 2023

Mater. Res. Express

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Bio-based silica gel is having many commercial significances in various sectors, such as medical, cleansing agents in industries, laboratory analysis, cosmetics, food additives, and so forth. In view of crucial requirements, this study aimed to synthesize and characterize the silica gel from Ethiopia’s primary post-harvest biomass residue, known as teff straw. The present study has been emphasized to investigate on the influence of calcination time for teff straw ash [Joshi et al 2022 Investigation of bamboo leaves as an alternative source of silica: extraction, characterization and its application as an adsorbent for methylene blue sequestration Chem. Select. 7, e202200011] preparation between 2 to 5 h. Further, the specific surface area of the resultant TSA samples was examined for preliminary understandings of processing time. By adopting the standard procedures through template-mediated sol–gel process, acquired TSA samples were subjected to treatment with NaOH to result sodium silicate solution and the amorphous silica. From the findings, it was apparent that the yield of silica gel has significantly influenced by calcination time. Accordingly, the maximum yield (90.0%) was attained at the calcination time of 4 h at 900 °C. Further, physiochemical and morphological characteristics of acquired silica gels were ascertained using sophisticated instrumental techniques such as BET, FTIR, XRD, SEM, and EDX. The XRD analysis of the crystallographic characteristics showed that the silica extracted from TSA at 900 °C for 2, 3, 4, and 5 h was found to be in amorphous state. The surface morphological studies of silica gel samples have been carried out using SEM studied. the EDX spectra showed the negligible amount of other impurities, nevertheless a larger amount of silica was found with highest purity of 99.77% e silica gel was obtained in TSA calcinated at 3 h. FTIR spectrum confirmed the presence of siloxane (Si–O–Si) vibrations of amorphous silica that are responsible for the strong bend observed at 1070 cm−1. It was found that the silica gel prepared at 3 h of calcination time had the largest specific surface area of 739.242 m2 g−1, pore volume of 0.32 cm3 g−1, and a pore diameter of 1.68 nm.

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Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 98%

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Tessema,

Gonfa,

Hailegiorgis

et al. 2023

Mater. Res. Express

Self Cite

View full text Add to dashboard Cite

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“…In contrast, colorimetric detection based on the real-time fabrication of metal nanoparticles via the reduction of metal ions allows for stabilized outcomes and visual readouts enabled by remarkable shifts in plasmonic characteristics owing to particle aggregation or etching, irrespective of the target sequence [ 28 ]. The development of various biological and chemical agents capable of reducing the formation of metal nanoparticles has attracted considerable attention [ 29 ]. Furthermore, research on the use of biocompatible and biodegradable materials as reducing agents for the chemical reduction of metal NPs is underway to be developed [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

D-Glucose-Mediated Gold Nanoparticle Fabrication for Colorimetric Detection of Foodborne Pathogens

Park,

Sivakumar,

Lee

2024

Biosensors

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Gold nanoparticle (AuNP) fabrication via the oxidation of D-glucose is applied for detecting two foodborne pathogens, Enterococcus faecium (E. faecium) and Staphylococcus aureus (S. aureus). D-glucose is used as a reducing agent due to its oxidation to gluconic acid by sodium hydroxide (NaOH), resulting in the formation of AuNPs. Based on this mechanism, we develop AuNP-based colorimetric detection in conjunction with loop-mediated isothermal amplification (LAMP) for accurately identifying the infectious bacteria. Here, Au+ ions bind to the base of double-stranded DNA. In the presence of D-glucose and NaOH, the LAMP amplicon-Au+ complex maintains its bound state at 65 °C for 10 min while it is reduced to AuNPs in a dispersed form, exhibiting a red color. We aimed to pre-mix D-glucose with LAMP reagents before amplification and induce successful colorimetry without inhibiting amplification to simplify the experimental process and decrease the reaction time. Therefore, the entire process, including LAMP and colorimetric detection, is accomplished in approximately 1 h. The limit of detection of E. faecium and S. aureus is confirmed using the introduced method as 101 CFU/mL and 100 fg/μL, respectively. We expect that colorimetric detection using D-glucose-mediated AuNP synthesis offers an application for simple and immediate molecular diagnosis.

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Rethinking Nanoparticle Synthesis: A Sustainable Approach vs. Traditional Methods

Jain,

Takuli,

Gupta

et al. 2024

Chemistry An Asian Journal

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This review portrays a comparison between green protocols and conventional nanoparticle (NP) synthesis strategies, highlighting each method's advantages and limitations. Various top‐down and bottom‐up methods in NP synthesis are described in detail. The green chemistry principles are emphasized for designing safe processes for nanomaterial synthesis. Among the green biogenic sources plant extracts, vitamins, enzymes, polysaccharides, fungi (Molds and mushrooms), bacteria, yeast, algae, and lichens are discussed. Limitations in the reproducibility of green protocols in terms of availability of raw material, variation in synthetic protocol, and selection of material due to geographical differences are elaborated. Finally, a conclusion is drawn utilizing green chemical principles, & a circular economy strategy to minimize waste generation, offering a promising framework for the synthesis of NPs emphasizing sustainability.

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Synthesis and characterization of silver nanoparticles using reducing agents of bitter leaf (Vernonia amygdalina) extract and tri-sodium citrate

Cited by 17 publications

References 44 publications

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

D-Glucose-Mediated Gold Nanoparticle Fabrication for Colorimetric Detection of Foodborne Pathogens

Rethinking Nanoparticle Synthesis: A Sustainable Approach vs. Traditional Methods

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