Green synthesis and characterization of silver nanoparticles using Enicostemma axillare (Lam.) leaf extract

Raj, Shani; Mali, Suresh Chand; Trivedi, Rohini

doi:10.1016/j.bbrc.2018.08.045

Cited by 173 publications

(63 citation statements)

References 29 publications

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“…A broad SPR band arose at 446 nm, indicating the formation of AgNPs [ 33 , 34 ]. The SPR of AuNPs and AgNPs was attributed to the interaction between free electrons on the metal surface and incident light [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Gold and Silver Nanoparticles by Using Amorphophallus paeoniifolius Tuber Extract and Evaluation of Their Antibacterial Activity

et al. 2020

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In this report, we discussed rapid, facile one-pot green synthesis of gold and silver nanoparticles (AuNPs and AgNPs) by using tuber extract of Amorphophallus paeoniifolius, and evaluated their antibacterial activity. AuNPs and AgNPs were synthesized by mixing their respective precursors (AgNO3 and HAuCl4) with tuber extract of Amorphophallus paeoniifolius as the bio-reducing agent. Characterization of AuNPs and AgNPs were confirmed by applying UV-vis spectroscopy, field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), and energy dispersive X-ray spectroscopy (EDS). From UV-vis characterization, surface plasmon resonance spectra were found at 530 nm for AuNPs and 446 nm for AgNPs. XRD data confirmed that both synthesized nanoparticles were face-centered cubic in crystalline nature, and the average crystallite sizes for the assign peaks were 13.3 nm for AuNPs and 22.48 nm for AgNPs. FTIR data evaluated the characteristic peaks of different phytochemical components of tuber extract, which acted as the reducing agent, and possibly as stabilizing agents. The antibacterial activity of synthesized AuNPs and AgNPs were examined in Muller Hinton agar, against two Gram-positive and four Gram-negative bacteria through the disc diffusion method. AuNPs did not show any inhibitory effect, while AgNPs showed good inhibitory effect against both Gram-positive and Gram-negative bacteria.

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Section: Resultsmentioning

confidence: 99%

Green Synthesis of Gold and Silver Nanoparticles by Using Amorphophallus paeoniifolius Tuber Extract and Evaluation of Their Antibacterial Activity

et al. 2020

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“…The contribution of carboxylic acids, ketones, and proteins containing C═O and N─H groups in the synthesis of AuNPs was exhibited through the shifting of FTIR peak from 1,634 to 1,620.25 cm −1 . The carboxylic acids have been reported to be adsorbed on surface of nanoparticles through the π electrons of the C═O group in the absence of any other strong ligand in order to enhance their stability . Rajeshkumar and Bharath described the contribution of ketones containing a C═O group in the reduction of metal ions to synthesize metallic nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…Phenolic compounds containing O─H groups are reported to be oxidized during reduction of gold ions into biocompounds with carbonyl groups. The π bonds of carbonyl groups possessed by oxidized biomolecules move to free orbital gold ions with subsequent formation of gold atoms . Majumdar and Bag reported that phenolic compounds containing O─H groups first bind to Au +3 to form the chelating rings, which are further oxidized into quinones with conversion of gold ions into gold atoms.…”

Section: Resultsmentioning

confidence: 99%

Mechanistic investigation of phytochemicals involved in green synthesis of gold nanoparticles using aqueous Elaeis guineensis leaves extract: Role of phenolic compounds and flavonoids

Ahmad

Bustam

Irfan

et al. 2019

Biotech and App Biochem

101

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Phytosynthesis of gold nanoparticles (AuNPs) has achieved an indispensable significance due to the diverse roles played by biomolecules in directing the physiochemical characteristics of biosynthesized nanoparticles. Therefore, the precise identification of key bioactive compounds involved in producing AuNPs is vital to control their tunable characteristics for potential applications. Herein, qualitative and quantitative determination of key biocompounds contributing to the formation of AuNPs using aqueous Elaeis guineensis leaves extract is reported. Moreover, roles of phenolic compounds and flavonoids in reduction of Au 3+ and stabilization of AuNPs have been elucidated by establishing a reaction mechanism. Fourier-transform infrared spectroscopy (FTIR) showed shifting of O─H stretching vibrations toward longer wavenumbers and C═O toward shorter wavenumbers due to involvement of polyphenolic compounds in biosynthesis and oxidation of polyphenolic into carboxylic compounds, respectively, which cape nanoparticles to inhibit the aggregation. Congruently, pyrolysis-gas chromatography-mass spectrometry revealed the major contribution of polyphenolic compounds in the synthesis of AuNPs, which was further endorsed by reduction of total phenolic and total flavonoids contents from 48.08 ± 1.98 to 9.59 ± 0.92 mg GAE/g and 32.02 ± 1.31 to 13.8 ± 0.97 mg CE/g within 60 Min, respectively. Based on experimental results, reaction mechanism explained the roles of phenolic compounds and flavonoids in producing spherical-shaped

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“…The results showed that the surface plasmon resonance absorption band for PMY with 4 mM AgNO 3 solution is better than that of the other three samples. The surface plasmon resonance absorption band is due to the combined effect of vibration of free electrons of metal ions and resonance of light waves [35]. Therefore, PMY with 4 mM AgNO 3 was used for further characterization and function analysis.…”

Section: Results and Disscussionmentioning

confidence: 99%

Biosynthesis of silver nanoparticle from pomelo (Citrus Maxima) and their antibacterial activity against acidovorax oryzae RS-2

Ali

Yao

et al. 2020

Mater. Res. Express

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Silver nanoparticles (AgNPs), synthesized with plant materials, are considered to be an emerging field of agriculture for their eco-friendly and outstanding antibacterial attributes. In this study, we synthesized AgNPs using pomelo (Citrus maxima) fruit extract as a biological capping and reducing material. The particle size was determined as 11.3-12.8 nm by using UV-vis spectrophotometer, TEM and x-ray diffraction analysis. UV-vis spectrophotometer analysis also confirmed the formation of AgNPs in colloidal solution and showed a maximum absorption at 426 nm. Fourier transform infrared spectra was used to analysed the involvement of biological molecule in AgNPs synthesis. The minimum inhibitory concentration of AgNPs against Acidovorax oryzae strain RS-2 was determined as 25 μg ml −1 by agar well diffusion and bacterial growth assay. In addition, bacterial viability and swarming motility were significantly inhibited by AgNPs. Compared with the control, 25 μg ml −1 of AgNPs lower bacterial biofilm formation up to 68.24%. The bacterial cell wall damaged by AgNPs was observed t TEM. Furthermore, AgNPs treatment resulted into the down regulation of expression of many type VI secretion system related genes, suggesting that AgNPs also have an effect on the virulence of bacteria. The overall conclusion of this study suggests that AgNPs can play an important role in controlling A. oryzae.

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Green synthesis and characterization of silver nanoparticles using Enicostemma axillare (Lam.) leaf extract

Cited by 173 publications

References 29 publications

Green Synthesis of Gold and Silver Nanoparticles by Using Amorphophallus paeoniifolius Tuber Extract and Evaluation of Their Antibacterial Activity

Green Synthesis of Gold and Silver Nanoparticles by Using Amorphophallus paeoniifolius Tuber Extract and Evaluation of Their Antibacterial Activity

Mechanistic investigation of phytochemicals involved in green synthesis of gold nanoparticles using aqueous Elaeis guineensis leaves extract: Role of phenolic compounds and flavonoids

Biosynthesis of silver nanoparticle from pomelo (Citrus Maxima) and their antibacterial activity against acidovorax oryzae RS-2

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