Statistical optimization of photo-induced biofabrication of silver nanoparticles using the cell extract of <i>Oscillatoria limnetica</i>: insight on characterization and antioxidant potentiality

Abo-Elmagd, Rasha A.; Hussein, Mervat H.; Hamouda, Ragaa A.; Shalan, Ahmed Esmail; Abdelrazak, Ahmed

doi:10.1039/d0ra08206f

Cited by 14 publications

(9 citation statements)

References 61 publications

(55 reference statements)

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“…Algae exist in various habitats and produce variegated bioactive substances such as polysaccharides, pigments, proteins, minerals, phenolics, flavonoids, tannins, and steroids [ 6 ], which are capable of reducing metal salts to respective NPs without any hazardous byproducts [ 7 , 8 , 9 ]. Recently, several studies have reported the synthesis of NPs using algal extracts from various algal species, including Turbinaria conoides [ 10 ], Sargassum polycystum [ 11 ], Laminaria japonica [ 12 ], Botryococcus braunii [ 5 ], Oscillatoria limnetica [ 13 ], Chlorella ellipsoidea [ 2 ], Gracilaria edulis [ 14 ], and Synechocystis sp. [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Maduraimuthu,

Ranishree,

Gopalakrishnan

et al. 2023

Antioxidants

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While various methods exist for synthesizing silver nanoparticles (AgNPs), green synthesis has emerged as a promising approach due to its affordability, sustainability, and suitability for biomedical purposes. However, green synthesis is time-consuming, necessitating the development of efficient and cost-effective techniques to minimize reaction time. Consequently, researchers have turned their attention to photo-driven processes. In this study, we present the photoinduced bioreduction of silver nitrate (AgNO3) to AgNPs using an aqueous extract of Ulva lactuca, an edible green seaweed. The phytochemicals found in the seaweed functioned as both reducing and capping agents, while light served as a catalyst for biosynthesis. We explored the effects of different light intensities and wavelengths, the initial pH of the reaction mixture, and the exposure time on the biosynthesis of AgNPs. Confirmation of AgNP formation was achieved through the observation of a surface plasmon resonance band at 428 nm using an ultraviolet-visible (UV-vis) spectrophotometer. Fourier transform infrared spectroscopy (FTIR) revealed the presence of algae-derived phytochemicals bound to the outer surface of the synthesized AgNPs. Additionally, high-resolution transmission electron microscopy (HRTEM) and atomic force microscopy (AFM) images demonstrated that the NPs possessed a nearly spherical shape, ranging in size from 5 nm to 40 nm. The crystalline nature of the NPs was confirmed by selected area electron diffraction (SAED) and X-ray diffraction (XRD), with Bragg’s diffraction pattern revealing peaks at 2θ = 38°, 44°, 64°, and 77°, corresponding to the planes of silver 111, 200, 220, and 311 in the face-centered cubic crystal lattice of metallic silver. Energy-dispersive X-ray spectroscopy (EDX) results exhibited a prominent peak at 3 keV, indicating an Ag elemental configuration. The highly negative zeta potential values provided further confirmation of the stability of AgNPs. Moreover, the reduction kinetics observed via UV-vis spectrophotometry demonstrated superior photocatalytic activity in the degradation of hazardous pollutant dyes, such as rhodamine B, methylene orange, Congo red, acridine orange, and Coomassie brilliant blue G-250. Consequently, our biosynthesized AgNPs hold great potential for various biomedical redox reaction applications.

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Section: Introductionmentioning

confidence: 99%

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Maduraimuthu,

Ranishree,

Gopalakrishnan

et al. 2023

Antioxidants

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“…The results demonstrate that Ulva/Ag cellulose nanocomposites are more negative than Ulva/nanocellulose. Abo-Elmagd et al [ 76 ] stated that charges and strong resistive forces between the particles prevent aggregation and keep the nanoparticles in the medium stable. The zeta potential value of AgNPs photosynthesized by Oscillatoria limnetica was −27.4 [ 77 ].…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Activity of Ulva/Nanocellulose and Ulva/Ag/Cellulose Nanocomposites and Both Blended with Fluoride against Bacteria Causing Dental Decay

et al. 2023

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One of the most prevalent chronic infectious disorders is tooth decay. Acids produced when plaque bacteria break down sugar in the mouth cause tooth decay. Streptococcus mutans and Lactobacillus acidophilus are the most prominent species related to dental caries. Innovative biocidal agents that integrate with a biomaterial to prevent bacterial colonization have shown remarkable promise as a result of the rapid advancement of nanoscience and nanotechnology. In this study, Ulva lactuca was used as a cellulose source and reducing agent to synthesize nanocellulose and Ulva/Ag/cellulose/nanocomposites. The characterizations of nanocellulose and Ulva/Ag/cellulose/nanocomposites were tested for FT-IR, TEM, SEM, EDS, XRD, and zeta potential. Ulva/Ag/cellulose/nanocomposites and Ulva/nanocellulose, both blended with fluoride, were tested as an antibacterial against S. mutans ATCC 25175 and L. acidophilus CH-2. The results of the SEM proved that nanocellulose is filament-shaped, and FT-IR proved that the functional groups of Ulva/nanocellulose and Ulva/Ag/cellulose/nanocomposites and cellulose are relatively similar but present some small diffusion in peaks. The TEM image demonstrated that the more piratical size distribution of Ulva/Ag/cellulose/nanocomposites ranged from 15 to 20 nm, and Ulva/nanocellulose ranged from 10 to 15 nm. Ulva/Ag/cellulose/nanocomposites have higher negativity than Ulva/nanocellulose. Ulva/Ag/cellulose/nanocomposites and Ulva/nanocellulose possess antibacterial activity against S. mutans ATCC 25175 and L. acidophilus CH-2, but Ulva/Ag/cellulose/nanocomposites are more effective, followed by that blended with fluoride. It is possible to use Ulva/Ag/cellulose/nanocomposites as an antimicrobial agent when added to toothpaste. It is promising to discover an economic and safe nanocomposite product from a natural source with an antimicrobial agent that might be used against tooth bacteria.

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“…Confirmation and characterization of OG-AgNPs at different reaction times was detected by UV–Vis spectroscopy, which was acted as a preliminary tool for recognizing AgNPs in aqueous solutions. Figure 1 B; illustrates UV–vis spectra of biosynthesized OG-AgNPs at different reaction intervals which exposed characteristic absorption bands in the range of 400–500 nm due to the surface plasmon resonance (SPR) of OG-AgNPs 6 , 47 . Spectral data demonstrates the absorption maximum peaks of the OG-Ag-NPs that were slightly red-shifted from 446 to 449 nm with increasing intensity (0.8–1.6 nm) by increasing the reaction time implying that, the nanoparticle size increased with increasing reaction time.…”

Section: Resultsmentioning

confidence: 99%

Phycotoxicity and catalytic reduction activity of green synthesized Oscillatoria gelatin-capped silver nanoparticles

Abo-Elmagd

Hamouda

Hussein

2022

Sci Rep

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Over the last decade, an extensive range of consumer products containing manufactured silver nanoparticles (AgNPs) have been progressively used. The unfitting usage and discharge of these materials can enable passage of AgNPs into the aquatic ecosystem causing prospective toxicological consequence. The present study shed new lights on the phycotoxicity of small (8.47–17.66 nm) and stable Oscillatoria reduced gelatin-capped silver nanoparticles (OG-AgNPs) fabricated using a completely green synthetic technique. In this work, estimating of the possible toxic effects of OG-AgNPs on two freshwater microalgae Chlorella vulgaris and Chlorella minutissima was carried. This study found that, the growth of cells and photosynthetic pigment inhibitory effects of OG-AgNPs exhibit a significant increase with increasing time and concentration compared to control. Based on the IC50 value C. vulgaris (3.705 μg/mL) was found to be more sensitive to OG-AgNPs than C. minutissima (5.8 μg/mL). This study revealed that OG-AgNPs exhibit potent phycotoxic effect against Chlorella species. Finally, the negative effect of OG-AgNPs on aquatic algae and these modifications might have severe effects on structure and function of aquatic ecosystems. Besides, the biosynthesized OG-AgNPs showed a catalytic activity in the reduction of hydrogen peroxide, one of the reactive oxygen species that represent a major threat to biological systems. This method pretends an auspicious non-skill dependent technique with a good sensitivity for determination of H2O2 concentration, particularly at trace ppm level for applying in numerous domains such as medical and industrial processes.

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Statistical optimization of photo-induced biofabrication of silver nanoparticles using the cell extract of Oscillatoria limnetica: insight on characterization and antioxidant potentiality

Abstract: Silver nanoparticles were successfully fabricated through a very simple, rapid, one-step photo-induced green approach.

Cited by 14 publications

References 61 publications

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Antioxidant Activities of Photoinduced Phycogenic Silver Nanoparticles and Their Potential Applications

Antibacterial Activity of Ulva/Nanocellulose and Ulva/Ag/Cellulose Nanocomposites and Both Blended with Fluoride against Bacteria Causing Dental Decay

Phycotoxicity and catalytic reduction activity of green synthesized Oscillatoria gelatin-capped silver nanoparticles

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