Green Synthesis of Silver Nanoparticles Using Waste Tea Leaves

Rajput, Darshana; Paul, Samrat; Gupta, Annika Durve

doi:10.21467/anr.3.1.1-14

Cited by 18 publications

(5 citation statements)

References 33 publications

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“…The present result was consistent with previous studies that recorded AgNP formation due to Ag + reduction to Ag 0 using different waste extracts such as pomegranate fruit peel, coffee ground waste, and tea waste. This was proven by the change of extracts' color and UV-vis spectra at a range of 390-440 nm [27,37]. On the other hand, TiO2NPs_ESE shows a maximum absorbance near the range of 320-350 nm, which proves titanium ions reduction to colloidal titanium with anatase phase.…”

Section: Characterization Of Nanoparticles (Nps)mentioning

confidence: 89%

Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation

Al Malki,

Hussien,

Akkad

et al. 2023

Sustainability

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Using biodegradable wastes represents a viable alternative to creating a sustainable economy that benefits all humans. The present study aimed to use daily used waste products, tea (TE) and eggshell (ES) wastes, to synthesize silver (AgNPs) and titanium oxide (TiO2NPs) nanoparticles, respectively. Firstly, the green-synthesized nanoparticles were characterized using an ultraviolet-visible spectrophotometer (UV-VIS), Scanning (SEM), transmission electron microscope (TEM), Dynamic light scattering (DLS), zeta potential analysis, X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. Then, followed by their cytotoxic assessment against normal human skin fibroblast (HSF) cells using sulforhodamine B (SRB) assay, AgNPs_TE (300 and 470 nm) and TiO2NPs_ESE (320 nm) formation was confirmed using UV-vis spectra. SEM and XRD showed their crystalline shape. TEM images determined the nano-size of AgNPs_TE (25 nm) and TiO2NPs_ESE (120 nm), which appeared smaller in comparison with DLS analysis (299.8 and 742.9 nm), with zeta potentials of −20.5 mV and −12.6 mV, respectively. There was a great difference in both NPs’ sizes using TEM and DLS measurements because DLS is known to be more sensitive to larger particles due to their light scattering. FTIR detected the functional groups found in TE and ESE that were responsible for the synthesis, capping, and stabilization of the synthesized AgNPs and TiO2NPs. The SRB assay reveals the safety of TiO2NPs on normal HSF cells with an IC50 > 100, while AgNPs have a high cytotoxic effect with an IC50 = 54.99 μg/mL.

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Section: Characterization Of Nanoparticles (Nps)mentioning

confidence: 89%

Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation

Al Malki,

Hussien,

Akkad

et al. 2023

Sustainability

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“…AgNPs obtained through its extracts have been examined for antibacterial and antifungal activity. 45 , 49 – 55 In certain cases, even their catalytic activity in the degradation of dyes present in industrial wastewater like Reactive Yellow 160, 56 Direct Fast Rose FR Red 227, 57 Basic Brilliant Flavine Y-40, 57 Reactive Red 81, 58 Congo Red Direct, 59 Orange E3 60 and Crystal Violet 61 have been confirmed. Sun and his co-workers assessed the effects of time, optimal dosage of extract, and temperature on the synthesis of AgNPs (20–90 nm).…”

Section: Introductionmentioning

confidence: 93%

“…Tea leaves as a reach plant source of natural reducing compounds have gained recognition among the interests of researchers not only in terms of extraction but also in the synthesis of nanoparticles of various metals. – Of all types of tea, green tea deserved special attention. AgNPs obtained through its extracts have been examined for antibacterial and antifungal activity. ,– In certain cases, even their catalytic activity in the degradation of dyes present in industrial wastewater like Reactive Yellow 160, Direct Fast Rose FR Red 227, Basic Brilliant Flavine Y-40, Reactive Red 81, Congo Red Direct, Orange E3 and Crystal Violet have been confirmed. Sun and his co-workers assessed the effects of time, optimal dosage of extract, and temperature on the synthesis of AgNPs (20–90 nm) .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles: Optimizing Green Tea Leaf Extraction for Enhanced Physicochemical Properties

Wirwis

Sadowski

2023

ACS Omega

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In this paper, we present the optimization of green tea leaf (Camellia sinensis L.) extraction, carried out using water and hydroalcoholic solvents, for the subsequent synthesis of silver nanoparticles (AgNPs). The value ranges for independent variables, including pH, time, and temperature, were selected based on single-factor experiments and used for extraction in the order presented by the Box–Behnken design. Three-dimensional response surface graphs were used to visually present the optimization results and determine the optimal extraction conditions: pH = 7, 30 min, 80 °C for water and pH = 5.5, 50 min, and 80 °C for water–ethanol. Our findings indicate that the water–ethanol mixture extracted more polyphenols. We compared the physicochemical properties of AgNPs obtained using both types of extractants via DLS and TEM analysis. We proposed a predicted mechanism for the reduction and stabilization of AgNPs based on the Fourier transform infrared data. The hydroethanolic extract leads to significant nanoparticle aggregation, which can be explained by the nucleation theory and agglomeration of nanoparticles in the presence of excess macromolecular organic substances (flocculation).

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“…Maghimaa and Veeraraghavan reported the production of AgNPs using Curcuma longa L. and Scutellaria barbata, respectively, with application in cotton fabric coatings for antimicrobial and wound healing activities [18,19]. The wound healing property originates from the inhibition of microorganisms causing infections [20]. Kabeerdass studied the antibacterial activity of silver nanoparticles synthesized by Alternanthera sessilis leaf extract and applied to textiles and determined zones of inhibition from 6 mm to 13 mm for Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumoniae, Klebsiella oxytoca, and Acinetobacter baumanii bacterial strains [21].…”

Section: Introductionmentioning

confidence: 99%

Phytochemical Synthesis of Silver Nanoparticles and Their Antimicrobial Investigation on Cotton and Wool Textiles

et al. 2023

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The use of bio-based reagents for silver nanoparticle (AgNP) production has gained much attention among researchers as it has paved the way for environmentally friendly approaches at low cost for synthesizing nanomaterials while maintaining their properties. In this study, Stellaria media aqueous extract was used for silver nanoparticle phyto-synthesis, and the resulting treatment was applied to textile fabrics to test its antimicrobial properties against bacteria and fungi strains. The chromatic effect was also established by determining the L*a*b* parameters. For optimizing the synthesis, different ratios of extract to silver precursor were tested using UV-Vis spectroscopy to observe the SPR-specific band. Moreover, the AgNP dispersions were tested for their antioxidant properties using chemiluminescence and TEAC methods, and the phenolic content was evaluated by the Folin-Ciocâlteu method. For the optimal ratio, values of average size, 50.11 ± 3.25 nm, zeta potential, −27.10 ± 2.16 mV, and polydispersity index, 0.209, were obtained via the DLS technique and zeta potential measurements. AgNPs were further characterized by EDX and XRD techniques to confirm their formation and by microscopic techniques to evaluate their morphology. TEM measurements revealed cvasi-spherical particles with sizes in the range of 10–30 nm, while SEM images confirmed their uniform distribution on the textile fiber surface.

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Green Synthesis of Silver Nanoparticles Using Waste Tea Leaves

Cited by 18 publications

References 33 publications

Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation

Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation

Green Synthesis of Silver Nanoparticles: Optimizing Green Tea Leaf Extraction for Enhanced Physicochemical Properties

Phytochemical Synthesis of Silver Nanoparticles and Their Antimicrobial Investigation on Cotton and Wool Textiles

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