Production and characterization of spherical thermostable silver nanoparticles from Spirulina platensis (Cyanophyceae)

Kaliamurthi, Satyavani; Selvaraj, Gurudeeban; Çakmak, Zeynep Elibol; Çakmak, Turgay

doi:10.2216/15-98.1

Cited by 28 publications

(11 citation statements)

References 25 publications

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“…This phenomenon has been previously reported. 34 When the concentration of silver nitrate was increased from 1 to 5 mM, at a fixed pH level of 7, the shape obtained resembled more a cube and seemed to have a more crystalline structure. In comparison with the AgNPs intracellularly synthesized, the extracellularly biosynthesized NPs were overall less stable, presenting agglomeration in a shorter period of time as well as presenting a higher size.…”

Section: Intracellular Biosynthesismentioning

confidence: 94%

“…In the biomass spectra, the broad peak at 3223 cm −1 indicated the stretch of an OH group, perhaps belonging to polyphenols or polysaccharides. 30,34 At 1 ph 9, 1 mM spherical 433-645 1 ph 7, 1 mM hexagonal disks 347 2 ph 9, 5 mM amorphous Na 2 ph 9, 1 mM cubes 800-1,500 3 ph 9, 3 mM spherical 644-915 3 ph 7, 5 mM cubes 300-486 4 ph 8, 3 mM spherical Na 4 ph 6, 3 mM amorphous 734 5 ph 7, 5 mM large needles Na 5 ph 8, 3 mM square 243-542 6 ph 7, 1 mM spherical 168 6 ph 8, 5 mM amorphous Na 7 ph 6, 3 mM spherical Na…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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Botryococcus braunii as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Arévalo-Gallegos¹,

García‐Pérez²,

Carrillo-Nieves³

et al. 2018

IJN

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BackgroundMicroalgae produce metabolites with notable potentialities to act as reducing and capping agents for the synthesis of silver nanoparticles (AgNPs) in a process widely recognized as an eco-friendly and cheaper alternative for the generation of nanoparticles (NPs).MethodsIn the present work, AgNPs were synthesized using live Botryococcus braunii cultures. Two biosynthesis routes were explored: (1) intracellular and (2) extracellular at pH levels of 6–9 using 1–5 mM silver nitrate concentrations.ResultsThe generation of NPs was confirmed via ultraviolet–visible spectroscopy. The morphological characteristics were observed using scanning electron microscopy which revealed that the newly developed AgNPs were mostly spherical in sizes starting from 168 nm. The characteristic peaks in a typical Fourier transform infrared spectroscopy suggested that the exopolysaccharides were the possible reducing and capping agents. The antimicrobial spectrum of the newly developed AgNPs was tested against bacterial strains, both Gram-negative, Gram-positive, and yeast, ie, Escherichia coli (American Type Culture Collection [ATCC] 25922), Pseudomonas aeruginosa (ATCC 27853), Staphylococcus aureus (ATCC 25923), and the yeast Candida albicans (ATCC 10231), respectively. The antimicrobial activity tests showed a stronger inhibition against Gram-negative bacteria. Statistically, the NPs biosynthesized at pH values of 6 and 8 displayed a higher antimicrobial activity.ConclusionOur findings showed that B. braunii is capable of generating AgNPs with antimicrobial potential.

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Section: Intracellular Biosynthesismentioning

confidence: 94%

Section: Ftir Spectroscopymentioning

confidence: 99%

Botryococcus braunii as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Arévalo-Gallegos¹,

García‐Pérez²,

Carrillo-Nieves³

et al. 2018

IJN

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“…Moreover, the rapid growth rates, avoidance of contaminations as no complicated nutrients were added to the media, and low cost of biomass production make A. platensis a promising source for the biosynthesis of nanoparticles. [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

et al. 2021

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In this study, zinc oxide nanoparticles (ZnO-NPs) were successfully fabricated through the harnessing of metabolites present in the cell filtrate of a newly isolated and identified microalga Arthrospira platensis (Class: Cyanophyceae). The formed ZnO-NPs were characterized by UV–Vis spectroscopy, Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Data showed the efficacy of cyanobacterial metabolites in fabricating spherical, crystallographic ZnO-NPs with a size ≈30.0 to 55.0 nm at a wavelength of 370 nm. Moreover, FT-IR analysis showed varied absorption peaks related to nanoparticle formation. XPS analysis confirms the presence of Zn(II)O at different varied bending energies. Data analyses exhibit that the activities of biosynthesized ZnO-NPs were dose-dependent. Their application as an antimicrobial agent was examined and formed clear zones, 24.1 ± 0.3, 21.1 ± 0.06, 19.1 ± 0.3, 19.9 ± 0.1, and 21.6 ± 0.6 mm, at 200 ppm against Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, and Candida albicans, respectively, and these activities were reduced as the NPs concentration decreased. The minimum inhibitory concentration (MIC) values were determined as 50 ppm for S. aureus, 25 ppm for P. aeruginosa, and 12.5 ppm for B. subtilis, E. coli, and C. albicans. More interestingly, ZnO-NPs exhibit high in vitro cytotoxic efficacy against cancerous (Caco-2) (IC50 = 9.95 ppm) as compared with normal (WI38) cell line (IC50 = 53.34 ppm).

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“…Ltd., Norfolk, U.K.) as done by (Kaliamurthi, Selvaraj, Cakmak, & Cakmak, 2016) . 2 mL of cell culture with adjusted absorbance value of (A680 = 2.0) with respective solutions was inoculated into the reaction vessels and continuously stirred at 25°C.…”

Section: Oxygen Evolutionmentioning

confidence: 99%

Untitled

Çakmak¹

2019

Turk. J. Fish. Aquat. Sci.

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Distinct impacts of ammonium nutrition for simultaneous production of triacylglycerol, lutein, and β-carotene were evaluated in Dunaliella tertiolecta. A physiologically realistic growth system was employed to compare metabolite production and growth characteristics of nitrogen deprived, ammonium-and nitrate supplied D. tertiolecta. The nitrogen dependent changes in D. tertiolecta were reflected as a dramatic decrease in growth related to decreased photosynthetic activity, reduced pigmentation and increased triacylglycerol production as observed in nitrogen deprived microalgae. On the other hand, ammonium nutrition caused a time-dependent increase of neutral lipids, triacylglycerols, chlorophylls and carotenoids, lutein and β -carotene in particular. Finally, ammonium nutrition improved FAME profile of D. tertiolecta for biodiesel production via an exclusive impact on increased saturation.

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Production and characterization of spherical thermostable silver nanoparticles from Spirulina platensis (Cyanophyceae)

Cited by 28 publications

References 25 publications

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Green Synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) Using Arthrospira platensis (Class: Cyanophyceae) and Evaluation of their Biomedical Activities

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