A critical review on phytosynthesis of gold nanoparticles: Issues, challenges and future perspectives

Ahmad, Tausif; Iqbal, Jibran; Bustam, Mohamad Azmi; Irfan, Muhammad; Asghar, Hafiz Muhammad Anwaar

doi:10.1016/j.jclepro.2021.127460

Cited by 34 publications

(16 citation statements)

References 188 publications

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“…[44] This can be attributed to that hydroxyl and carboxyl groups take place during conversion of M + n to M 0 , and relative abundance of these groups to the M n + ion affects the formation speed and growth pattern of the MNSs. [45] Even though the literature supports our findings in the case of plant extracts [46] and pure-compounds such as increased kaempferol 3-O-β-D-apiofuranosyl-7-O-α-L-rhamnopyranoside ratio to Au 3 + altered the morphology of the AuNSs, [47] reverse cases were reported as well. For instance, increasing the extract amount for the same Au 3 + ion concentration increased the size and altered the morphology from spherical to protruding shape.…”

Section: Chemistryselectsupporting

confidence: 78%

Comparison of Blueberry and Dandelion Aqueous Extracts in the Synthesis of Gold and Silver Nanostructures, and Their Applications as Anti‐Pseudomonas aeruginosa Agent

et al. 2023

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We performed a comparative study using aqueous extracts of dandelion flowers and blueberry fruits to synthesize gold‐ (Au) and silver‐ (Ag) nanostructures (NSs). The blueberry extracts gave nanowire and spherical AuNSs upon changing the ratio of the extracts to Au3+precursor while altering the ratio for the dandelion extracts resulted in formation of only anisotropic AuNSs. Similar results were obtained during the AgNSs, where the dandelion extracts resulted in formation of quasi‐spherical AgNSs at the tested ratio (extract/AgNO3 ratio) while altering the ratio for the blueberry extracts resulted in nanorod and nanoplates formation. We argued that this could be from dominancy of a lone compound or a group of compounds and tested this claim by introducing chrysin and amino acid mixtures to the blueberry extracts. Altering the added chrysin amount triggered nanoplate and spherical AuNSs formation while alteration in amino acid mixture content did not change the morphology, and spherical AuNSs were obtained. The antibacterial studies revealed the AgNSs are toxic to Pseudomonas aeruginosa with 8 μg/mL MBC (minimum bactericidal concentration) and 3 μg/mL values for the blueberry and dandelion extracts synthesized AgNSs while penicillin/streptomycin sulfate mixture carrying Dandelion‐AuNSs gave 12‐times lower MBC value in comparison to free penicillin/streptomycin sulfate mixture.

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Section: Chemistryselectsupporting

confidence: 78%

Comparison of Blueberry and Dandelion Aqueous Extracts in the Synthesis of Gold and Silver Nanostructures, and Their Applications as Anti‐Pseudomonas aeruginosa Agent

et al. 2023

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“…This is demonstrated both in the transformation process of metal nanoparticles, and in the electrical transformation of the substance on the nanoparticle surface [ 25 ]. The findings show that the size of nanoparticles is affected by the conditions of “green synthesis”, such as concentration and volume of the precursor; aliquot of plant extract; the temperature of synthesis; and pH of the reaction mixture [ 26 , 27 , 28 ]. Thus, a higher temperature results in the formation of smaller nanoparticles and higher formation rate [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Phytosynthesized Gold Nanoparticles for Electrosensing

Stozhko

Bukharinova

Khamzina

et al. 2021

Sensors

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Gold nanoparticles are widely used in electrosensing. The current trend is to phytosynthesize gold nanoparticles (phyto-AuNPs) on the basis of the “green” chemistry approach. Phyto-AuNPs are biologically and catalytically active, stable and biocompatible, which opens up broad perspectives in a variety of applications, including tactile, wearable (bio)sensors. However, the electrochemistry of phytosynthesized nanoparticles is not sufficiently studied. This work offers a comprehensive study of the electrochemical activity of phyto-AuNPs depending on the synthesis conditions. It was found that with an increase in the aliquot of the plant extract, its antioxidant activity (AOA) and pH, the electrochemical activity of phyto-AuNPs grows, which is reflected in the peak potential decrease and an increase in the peak current of phyto-AuNPs electrooxidation. It has been shown that AOA is an important parameter for obtaining phyto-AuNPs with desired properties. Electrodes modified with phyto-AuNPs have demonstrated better analytical characteristics than electrodes with citrate AuNPs in detecting uric and ascorbic acids under model conditions. The data about the phyto-AuNPs’ electrochemistry may be useful for creating highly effective epidermal sensors with good biocompatibility.

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“…As a result, watersoluble compounds like phenolic, alcohol and amines may act as capping agents in the synthesis of AuNPs, as well as aiding in NPs stabilization under physiological conditions. The capping and stabilization of AuNPs have been attributed to hydroxyl groups and amines [43] .…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Gold Nanoparticles, Silver Nanoparticles and Gold-Silver Alloy Nanoparticles Using Ziziphus spina-christi Leaf Extracts and Antibacterial Activity against Multidrug-Resistant Bacteria

Alzahrani¹,

Ali²,

Althubaiti³

et al. 2022

IJPS

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Synthesis of Nanoparticles Using Ziziphus spina-christi Leaf Extracts and its Antibacterial ActivityMultidrug-resistant bacteria continue to pose the greatest threat to public health. Metallic nanoparticles are one of the more promising strategies for combating antibiotic resistance. This research aims to determine the effect of gold and silver nanoparticles and gold-silver alloy nanoparticles as antibacterial agents. On the other hand, biogenic synthesized gold and silver nanoparticles using Ziziphus spina-christi leaf extract and preparation of gold-silver alloy nanoparticles for treatment of multidrug-resistant bacteria were studied. The formation of nanoparticles was characterized using ultraviolet-visible spectrophotometer, fourier transforms infrared spectroscopy, X-ray diffraction and transmission electron microscopy. Antibacterial activity of the biosynthesized gold nanoparticles, silver nanoparticles and gold-silver alloy nanoparticles was studied against Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Acinetobacter baumannii and Enterococcus faecalis. In the present study, the minimum inhibitory concentration ranged from 61.33 to 64 µg/ml and the minimum bactericidal concentration of the silver nanoparticles ranged from 85.33 to 93.33 µg/ml against multidrug-resistant strains. Synthesized gold nanoparticles had no inhibition zone, indicating that silver nanoparticles have no negative effect on multidrug-resistant bacteria. Minimum inhibitory concentration of gold nanoparticles was in high concentration against multidrug-resistant strain was not bactericidal. The highest minimum inhibitory concentration of gold nanoparticles was 114 µg/ml. Finally, the minimum inhibitory concentration ranged from 53.33 to 62 µg/ml and the minimum bactericidal concentration of the gold-silver alloy nanoparticles ranged from 77.33 to 93.33 µg/ml against multidrug-resistant strains. These results indicate that gold-silver alloy nanoparticles showed higher antimicrobial ability when compared to silver nanoparticles and gold nanoparticles alone. Finally, the synthesized nanoparticles could be used as an alternative antimicrobial agent against multidrug-resistant bacteria, according to our findings.

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A critical review on phytosynthesis of gold nanoparticles: Issues, challenges and future perspectives

Cited by 34 publications

References 188 publications

Comparison of Blueberry and Dandelion Aqueous Extracts in the Synthesis of Gold and Silver Nanostructures, and Their Applications as Anti‐Pseudomonas aeruginosa Agent

Comparison of Blueberry and Dandelion Aqueous Extracts in the Synthesis of Gold and Silver Nanostructures, and Their Applications as Anti‐Pseudomonas aeruginosa Agent

Electrochemical Properties of Phytosynthesized Gold Nanoparticles for Electrosensing

Green Synthesis of Gold Nanoparticles, Silver Nanoparticles and Gold-Silver Alloy Nanoparticles Using Ziziphus spina-christi Leaf Extracts and Antibacterial Activity against Multidrug-Resistant Bacteria

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