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... such as silver nitrate (1 mM), hydrochloric acid (0.1 M), and sodium hydroxide (0.1 M) were purchased from Sigma-Aldrich or Merck and Dermaneh leaves (Fig. 1) were collected from Khozestan province, Iran. ...
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... measurements were performed on Philips, Model CM120 instrument operated at an accelerating voltage 120 kV. The TEM images of colloid nanoparticles are shown in Figure 10. It is observed that the morphology of nanoparticles is often polydispersed, spherical and cubic, which is in settlement with the shape of the SPR band in the UV-Vis spectra. ...
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... to identify the possible biomolecules in the plant extract responsible for predicting their role in nanoparticle synthesis and the reduction of silver ions as well as the capping agents responsible for the stability of biogenic nanoparticle solution. The FTIR spectra indicated the existence of various functional groups at different positions. Figs. 11(a) and 11(b) show the FTIR spectra of plant extract before and after synthesis, representing prominent absorption band at around 3413 cm -1 , 1619, 1348, 1080, 797, 485 The peaks in the region 3412 cm -1 were assigned to O-H stretching vibration, indicating the presence of hydroxyl groups such as alcohol and phenol compounds and aldehyde ...
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... such as silver nitrate (1 mM), hydrochloric acid (0.1 M), and sodium hydroxide (0.1 M) were purchased from Sigma-Aldrich or Merck and Dermaneh leaves (Fig. 1) were collected from Khozestan province, Iran. ...
Context 5
... measurements were performed on Philips, Model CM120 instrument operated at an accelerating voltage 120 kV. The TEM images of colloid nanoparticles are shown in Figure 10. It is observed that the morphology of nanoparticles is often polydispersed, spherical and cubic, which is in settlement with the shape of the SPR band in the UV-Vis spectra. ...
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... to identify the possible biomolecules in the plant extract responsible for predicting their role in nanoparticle synthesis and the reduction of silver ions as well as the capping agents responsible for the stability of biogenic nanoparticle solution. The FTIR spectra indicated the existence of various functional groups at different positions. Figs. 11(a) and 11(b) show the FTIR spectra of plant extract before and after synthesis, representing prominent absorption band at around 3413 cm -1 , 1619, 1348, 1080, 797, 485 The peaks in the region 3412 cm -1 were assigned to O-H stretching vibration, indicating the presence of hydroxyl groups such as alcohol and phenol compounds and aldehyde ...
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... The pH of the reaction changes the chemical nature of the extract, which has an effect of changing its performance and rate of reduction and therefore nanoparticle synthesis [36]. The size and shape of silver nanoparticles are affected by the pH of the reaction solution [37][38][39][40]. This was investigated further with the addition of hydrochloric acid (HCl), which did not produce any nanoparticles ( Figure 2). ...
Green synthesis of silver nanoparticles (AgNPs) involves a reduction reaction of a metal salt solution mixed with a plant extract. The reaction yield can be controlled using several independent factors, such as extract and metal concentration, temperature, and incubation time. AgNPs from Origanum vulgare (oregano) were synthesized in the past. However, no investigations were performed on the combined effects of independent factors that affect the synthesis. In this work, silver nitrate, oregano extract, and sodium hydroxide (NaOH) concentrations were chosen as the independent factors, and full factorial design under Response Surface Methodology was employed. UV-Vis absorbance spectroscopy, X-ray Powder Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the nanoparticles. A Voigt function was fitted on the measured UV-Vis spectra. The fitting parameters of the Voigt function, peak wavelength, area, and Full Width at Half Maximum, were used as the responses. A quadratic model was fitted for the peak wavelength and area. The NaOH concentration proved to be the dominant factor in nanoparticle synthesis. UV-Vis absorbance showed a characteristic plasmon resonance of AgNPs at 409 nm. XRD verified the crystallinity of the nanoparticles and FTIR identified the ligands involved.
... The pH of the reaction changes the chemical nature of the extract, which has an effect to change its performance and rate of reduction and therefore nanoparticle synthesis [30]. The size and shape of silver nanoparticles are affected from the pH of the reaction solution [31][32][33][34]. This was investigated further with the addition of hydrochloric acid (HCl), which did not produce any nanoparticles as shown in Figure 2. The fitting parameters used in the Voigt profile are related to nanoparticle size, shape, yield and size distribution [13]. ...
Silver nanoparticles from Origanum vulgare (Oregano) have been synthesized in the past. However, no investigation has been performed on the combined effects of independent factors that affect the synthesis. Silver nitrate and Oregano concentrations, incubation temperature and time, as well as pH can play crucial roles in synthesis. In this regard Full Factorial Design was applied. A Voigt function was fitted on the measured UV – Vis spectra. The fitting parameters of the Voigt function (peak wavelength, area, and Full Width at Half Maximum) were used as the responses. A quadratic model was fitted for the peak wavelength and area, and the pH proved the dominant factor on nanoparticle synthesis.
... The pH of the reaction changes the chemical nature of the extract, which has an effect to change its performance and rate of reduction and therefore nanoparticle synthesis [30]. The size and shape of silver nanoparticles are affected from the pH of the reaction solution [31][32][33][34]. This was investigated further with the addition of hydrochloric acid (HCl), which did not produce any nanoparticles as shown in Figure 2. The fitting parameters used in the Voigt profile are related to nanoparticle size, shape, yield and size distribution [13]. ...
Silver nanoparticles from Origanum vulgare (Oregano) have been synthesized in the past. However, no investigation has been performed on the combined effects of independent factors that affect the synthesis. Silver nitrate and Oregano concentrations, incubation temperature and time, as well as pH can play crucial roles in synthesis. In this regard Full Factorial Design was applied. A Voigt function was fitted on the measured UV – Vis spectra. The fitting parameters of the Voigt function (peak wavelength, area, and Full Width at Half Maximum) were used as the responses. A quadratic model was fitted for the peak wavelength and area, and the pH proved the dominant factor on nanoparticle synthesis.
... The phytochemical analysis of A. sieberi revealed that it was rich in amines, carboxylic groups (such as alcohols and phenols), and alkenes. In agreement with these findings, a previous study showed that the FTIR analysis of the leaf extract of A. sieberi had the highest peaks for hydroxyl groups, alkanes, alkenes, amides, and amines [23,24]. In addition, the study conducted by Alotibi and Rizwana (2019) revealed that the methanolic extract of A. sieberi was rich in the functional groups of OH, CH stretching, C=O stretching, and aromatic skeletal stretches, which agreed with the current results as well [25]. ...
Background:
Artemisia sieberi (mugwort) is a member of the daisy family Asteraceae and is widely propagated in Saudi Arabia. A. sieberi has historical medical importance in traditional societies. The current study aimed to assess the antibacterial and antifungal characteristics of the aqueous and ethanolic extracts of A. sieberi. In addition, the study investigated the effect of silver nanoparticles (AgNPs) synthesized from the A. sieberi extract.
Methods:
The ethanolic and aqueous extracts and AgNPs were prepared from the shoots of A. sieberi. The characteristics of AgNPs were assessed by UV-visible spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and dynamic light scattering (DLS). The antibacterial experiments were performed against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa. The fungal species used were Candida parapsilosis, Candida krusei, Candida famata, Candida rhodotorula, and Candida albicans. The antibacterial and antifungal characteristics were evaluated by measuring the diameter of growing organisms in Petri dishes treated with different concentrations of either extracts or AgNPs compared to the untreated controls. Furthermore, TEM imaging was used to investigate any ultrastructure changes in the microbes treated with crude extracts and AgNO3.
Results:
The ethanolic and aqueous extracts significantly decreased the growth of E. coli, S. aureus, and B. subtilis (p < 0.001), while P. aeruginosa was not affected. Unlike crude extracts, AgNPs had more substantial antibacterial effects against all species. In addition, the mycelial growth of C. famata was reduced by the treatment of both extracts. C. krusei mycelial growth was decreased by the aqueous extract, while the growth of C. parapsilosis was affected by the ethanolic extract and AgNPs (p < 0.001). None of the treatments affected the growth of C. albicans or C. rhodotorula. TEM analysis showed cellular ultrastructure changes in the treated S. aureus and C. famata compared to the control.
Conclusion:
The biosynthesized AgNPs and extracts of A. sieberi have a potential antimicrobial characteristic against pathogenic bacterial and fungal strains and nullified resistance behavior.
Multifunctional nanoparticles are being formulated to overcome the side effects associated with anticancer drugs as well as conventional drug delivery systems. Cancer therapy has gained the advancement due to various pragmatic approaches with better treatment outcomes. The metal nanostructures such as gold and silver nanoparticles accessible via eco-friendly method provide amazing characteristics in the field of diagnosis and therapy towards cancer diseases. The environmental friendly approach has been proposed as a substitute to minimize the use of hazardous compounds associated in chemical synthesis of nanoparticles. In this attempt, researchers have used various microbes, and plant-based agents as reducing agents. In the last 2 decades various papers have been published emphasizing the benefits of the eco-friendly approach and advantages over the traditional method in the cancer therapy. Despite of various reports and published research papers, eco-based nanoparticles do not seem to find a way to clinical translation for cancer treatment. Present review enumerates the bibliometric data on biogenic silver and gold nanoparticles from Clarivate Analytics Web of Science (WoS) and Scopus for the duration 2010 to 2022 for cancer treatment with a special emphasis on breast, ovarian and cervical cancer. Furthermore, this review covers the recent advances in this area of research and also highlights the obstacles in the journey of biogenic nanodrug from clinic to market.
Mother nature furnishes various sources to synthesize nanomaterial’s with different geometry, size, and functionality. In this outline, we aimed to discuss the biological source-mediated fabrication of Ag NPs because of their easy handling, yields, and economical and non-toxicity. The literature reveals that different plant species, fungi, and bacteria can employ biosynthesis, enabling the fabrication of nanoparticles with different features, notably size, geometry, and morphology. The exact mechanisms have not been understood well, even though it is trusted that bio-sourced is responsible for this process. The method of synthesis can be influenced by pH, concentration, time, and biomass. The optimized biosynthesized AgNPs can employ in various domains like sensors, nanomedicine, environmental pollution etc., The main objective of the paper is to elaborate on the biosynthesized AgNPS in electrochemical sensing and its surface modifications. Furthermore, these electroanalytical techniques are to be used for real-time sampling to allow the selective detection of the target analyte.
