Biologically synthesized silver nanoparticles by aqueous extract of Satureja intermedia C.A. Mey and the evaluation of total phenolic and flavonoid contents and antioxidant activity

Firoozi, Somayeh; Jamzad, Mina; Yari, Mohammad

doi:10.1007/s40097-016-0207-0

Cited by 49 publications

(30 citation statements)

References 27 publications

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“…The redshift observed in the case of AgNPs that are synthesized using extracts may be explained by the difference in their size, shape, and agglomeration status [ 22 ]. Our results are in accordance with results obtained previously with different extracts [ 15 , 23 , 24 , 25 ].…”

Section: Resultssupporting

confidence: 93%

Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application

et al. 2020

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Silver nanoparticles (AgNPs) were synthesized using hydroalcoholic extracts of dittany (Origanum dictamnus), sage (Salvia officinalis), sea buckthorn (Elaeagnus rhamnoides, syn. Hippophae rhamnoides), and calendula (Calendula officinalis) as reducing agents. AgNPs synthesized using NaBH4 and citric acid were used as control. The impact of the origin of the extract and preparation conditions (light, temperature, reaction time) on the properties of the synthesized AgNPs was investigated. The structure, morphology, composition, physicochemical characteristics, and colloidal stability were characterized using dynamic laser scattering (DLS), ultraviolet-visible spectrophotometry (UV–/Vis), XRD, X-ray fluorescence (XRF), TEM, and FTΙR. The reduction of total phenolic and flavonoid content of the extracts after the reaction of AgNPs synthesis was also determined. Low IC50 values for all types of AgNPs revealed good antioxidant activity, attributable to the phenolic and flavonoid content of their surface. The results suggest that plant extract selection is important to the green synthesis of AgNPs because it affects the kinetics of their synthesis as well as their morphology, physicochemical characteristics, and colloidal stability. In vitro permeation studies on porcine skin revealed that AgNPs remained at the upper layers of stratum corneum and did not penetrate the skin barrier after 4 h of cutaneous application suggesting the safety of their application on intact skin for a relatively short time.

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Section: Resultssupporting

confidence: 93%

Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application

et al. 2020

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“…The FT-IR spectrum revealed presence of various active phyto-constituents including flavonoids, phenolic compounds and proteins in the aqueous M. oleifera leaves extract and they could be responsible for the reduction of silver ions and stabilization of the phythosynthesized Ag-NPs (Firoozi et al 2016). Moreover, the FT-IR spectrum confirmed that incorporation of Ag-NPs enhanced the phenolic compounds in the plant extract.…”

Section: Discussionmentioning

confidence: 82%

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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“…The reduced concentration of active biomolecules either in the extract or on functionalised textile (i.e. due to consumption for AgNP formation), decreases the antioxidant activity (Firoozi et al 2016). The antioxidant activity of functionalised cotton fabrics with in-situ synthesised AgNP was evaluated by DPPH* assay, which is a widely used method to evaluate the ability of antioxidants to scavenge free radicals, known to be an important factor in biological damage caused by oxidative stress (Sahgal et al 2009).…”

Section: Resultsmentioning

confidence: 99%

Development of antibacterial and UV protective cotton fabrics using plant food waste and alien invasive plant extracts as reducing agents for the in-situ synthesis of silver nanoparticles

2021

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The development of cellulose-based textiles that are functionalised with silver nanoparticles (AgNP), synthesised according to a green approach, and offer protection against ultraviolet (UV) radiation and pathogenic bacteria is very important today. In the present work we demonstrate the environmentally friendly approach to obtain such textile material by AgNP synthesis directly (in-situ) on cotton fabrics, using water extracts of plant food waste (green tea leaves, avocado seed and pomegranate peel) and alien invasive plants (Japanese knotweed rhizome, goldenrod flowers and staghorn sumac fruit) as reducing agents. The extracts were analysed for their total content of phenols and flavonoids and their antioxidant activity. The synthesised AgNP on cotton were round, of different size and amount depending on the reducing agent used. The highest amount of AgNP was found for samples where Japanese knotweed rhizome extract was used as reducing agent and the lowest where extracts of goldenrod flowers and green tea leaves were used. Regardless of the reducing agent used to form AgNP, all cotton samples showed excellent protection against E. coli and S. aureus bacteria and against UV radiation with UV protection factor values above 50. The best results for UV protection even after the twelve repetitive washing cycles were found for the sample functionalized with AgNP synthesised with an extract of the Japanese knotweed rhizome. Due to the presence of AgNP on cotton, the air permeability and thermal conductivity decreased. AgNP had no effect on the change in breaking strength or elongation of fabrics. Graphic abstract

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Biologically synthesized silver nanoparticles by aqueous extract of Satureja intermedia C.A. Mey and the evaluation of total phenolic and flavonoid contents and antioxidant activity

Cited by 49 publications

References 27 publications

Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application

Effect of Plant Extracts on the Characteristics of Silver Nanoparticles for Topical Application

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

Development of antibacterial and UV protective cotton fabrics using plant food waste and alien invasive plant extracts as reducing agents for the in-situ synthesis of silver nanoparticles

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