Comparative evaluation of five plant extracts and juices for nanoiron synthesis and application for hexavalent chromium reduction

Mystrioti, Christiana; Xanthopoulou, Themis; Tsakiridis, P.E.; Papassiopi, Nymphodora; Xenidis, Anthimos

doi:10.1016/j.scitotenv.2015.08.091

Cited by 122 publications

(37 citation statements)

References 17 publications

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“…Surprisingly, for the AuNPs 1% tea solution, an important increase of polyphenols was detected after the catalytic reduction of 4-NP ( Figure 5 , entry 3 in comparison with entry 2). This fact can be attributed to (i) conceivable regeneration of polyphenols under catalytic reaction conditions and (ii) possible interference of the small AuNPs with the polyphenol measurements [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Phenolic Compounds on the Synthesis of Gold Nanoparticles and its Catalytic Activity in the Reduction of Nitro Compounds

et al. 2018

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Gold nanoparticles (AuNPs) were prepared using an eco-friendly approach in a single step by reduction of HAuCl4 with polyphenols from tea extracts, which act as both reducing and capping agents. The obtained AuNPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), and X-ray photoelectron spectroscopy (XPS). They act as highly efficient catalysts in the reduction of various aromatic nitro compounds in aqueous solution. The effects of a variety of factors (e.g., reaction time, type and amount of reducing agent, shape, size, or amount of AuNPs) were studied towards the optimization of the processes. The total polyphenol content (TPC) was determined before and after the catalytic reaction and the results are discussed in terms of the tea extract percentage, the size of the AuNPs, and their catalytic activity. The reusability of the AuNP catalyst in the reduction of 4-nitrophenol was also tested. The reactions follow pseudo first-order kinetics.

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Section: Resultsmentioning

confidence: 99%

Effect of Phenolic Compounds on the Synthesis of Gold Nanoparticles and its Catalytic Activity in the Reduction of Nitro Compounds

et al. 2018

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“…Amount of the polyphenol in the extract used during formation of the nano-extract increased when size of the nanoparticles decreased. This might be attributed to conceivable regeneration of polyphenols under catalytic reaction conditions and possible interference of the small nanoparticles with measurement of the polyphenolic compounds (Mystrioti et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the biological activity of Moringa oleifera leaves extract after incorporating silver nanoparticles, in vitro study

et al. 2019

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Background: Moringa oleifera is rich in various active phyto-constituents (tannins, sterols, terpenoids, flavonoids, saponins, anthraquinones, alkaloids, and vitamins) in addition to different minerals in its leaves and seeds. Presence of these constituents is responsible for the antioxidant activity and the ability to protect against oxidative damage. Based on measurements of the cytotoxic activities, M. oleifera leaves were found to be more effective than the plant seeds. Therefore, the plant leaves were selected for preparation of silver plant nano-extract during the present study. Methods: The silver nanoparticles (Ag-NPs) were synthesized then characterized by transmission electron microscope (TEM), ultraviolet-visible (UV-VIS) spectroscopy and dynamic light scattering (DLS) measurements. Moreover, the in vitro antioxidants were assayed in M. oleifera leaves extract before and after incorporating Ag-NPs through measurement of total polyphenolic compounds and scavenging activities against free radicals in addition to the cytotoxic activity against growth of human colon carcinoma. Furthermore, the phenolic compounds were detected by gas chromatography coupled with a mass spectrometer (GC/MS) and fourier transform infrared (FT-IR) spectroscopy. Also, the median lethal dose (LD 50) of the extract and nano-extract was evaluated. Results: It was showed that incorporation of Ag-NPs into the M. oleifera leaves extract enhanced the total antioxidant capacity, concentration of total polyphenolic compounds, reducing power and scavenging activity against attack of free radicals in addition to increasing the cytotoxicity against growth of colon cancer cells. This might be related to increasing the phenolic compounds as a result of incorporation of Ag-NPs and detected by the GC/MS and FT-IR analysis. It was found that there was no wide gap in the LD 50 between M. oleifera leaves extract and silver nano-extract. The LD 50 values of the M. oleifera leaves extract and silver nano-extract were about 14,250 and 13,750 mg/Kg, respectively. Conclusion: The study revealed that incorporation of Ag-NPs into the M. oleifera extract enhanced the in vitro antioxidative efficiency and might be related to increasing the phenolic compounds.

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“…Former research"s show the report of green nZVI it can be used to damage medicines (e.g. ibuprofen) in soils [10], Cr (VI) ions [13,14], nitrate [15]. Treatment of swege waste water [20].…”

Section: Removal Methods For Iron Nanoparticles In Waste Watermentioning

confidence: 99%

Green Filters: A Low Cost an Effective Way to Treating Waste Water

Sankhla¹,

Pandey²,

Parihar³

et al. 2018

ARC Journal of Forensic Science

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Comparative evaluation of five plant extracts and juices for nanoiron synthesis and application for hexavalent chromium reduction

Cited by 122 publications

References 17 publications

Effect of Phenolic Compounds on the Synthesis of Gold Nanoparticles and its Catalytic Activity in the Reduction of Nitro Compounds

Effect of Phenolic Compounds on the Synthesis of Gold Nanoparticles and its Catalytic Activity in the Reduction of Nitro Compounds

Evaluation of the biological activity of Moringa oleifera leaves extract after incorporating silver nanoparticles, in vitro study

Green Filters: A Low Cost an Effective Way to Treating Waste Water

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