Sunlight Induced Rapid Synthesis And Kinetics Of Silver Nanoparticles Using Leaf Extract Of Achyranthes Aspera L. And Their Antimicrobial Applications

Amaladhas, T. Peter; Usha, M.; Naveen, S.

doi:10.5185/amlett.2013.2427

Cited by 30 publications

(21 citation statements)

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“…In the presence of sunlight or blue, red, green, or white LED light, reduction of Ag + occurred at an optimum pH of 7, 5, 5, 4, and 4, respectively. Intense bands of SPR for sunlight, blue, red, green, and white LED lights were observed at λ max of 428, 440, 445, 443, and 440 nm, respectively, and were attributed to the excitation of free electrons in AgNPs [20,21]. The color change in the reaction mixture from colorless to reddish brown with yellow shades after 30 min indicated the formation of AgNPs.…”

Section: Optimization and Uv-vis Spectral Studiesmentioning

confidence: 99%

Photobiologic-mediated fabrication of silver nanoparticles with antibacterial activity

Lee¹,

Lim

Velmurugan

et al. 2016

Journal of Photochemistry and Photobiology B: Biology

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Section: Optimization and Uv-vis Spectral Studiesmentioning

confidence: 99%

Photobiologic-mediated fabrication of silver nanoparticles with antibacterial activity

Lee¹,

Lim

Velmurugan

et al. 2016

Journal of Photochemistry and Photobiology B: Biology

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“…The formation of AgNPs is monitored using UV-Vis spectrophotometer in the range of 200-800 nm, where an intense peak was obtained at 436 nm, which is known as Localized Surface Plasmon Resonance (LSPR) band due to the excitation of free electrons in the nanoparticles. The peak is sharp and symmetrical in shape signifying the formation of mono dispersed AgNPs [33]. Figure 2a represents the UV-Vis spectra of synthesized AgNPs as a function of interaction time.…”

Section: Uv-vis Spectra Of Agnpsmentioning

confidence: 99%

“…At higher pH 9, rate of formation of AgNPs is high. This may be due to the large number of free functional groups available for silver binding, which facilitated higher number of silver ions to bind and subsequently form a large number of NPs with smaller diameters (k max 417 nm) [33].…”

Section: Effect Of Phmentioning

confidence: 99%

“…To overcome this, photo-assisted biosynthesis of Ag and AuNPs using many plants has been qualitatively investigated [28]. The sunlight irradiation technique has been formerly reported for the synthesis of nanoparticles using few plant materials such as Allium sativum [29], Andrachnea chordifolia [30], Piper betle [31], Bacillus amyloliquefaciens [32] and Achyranthus aspera [33]. Apart from plant materials, dendrimers and starch are also used as reducing/stabilizing agents in the sunlight-induced synthesis of nanoparticles [34,35].…”

Section: Introductionmentioning

confidence: 99%

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Photobiological synthesis of noble metal nanoparticles using Hydrocotyle asiatica and application as catalyst for the photodegradation of cationic dyes

2015

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Solar light induced photo catalysis by plasmonic nanoparticles such as Au and Ag is an important field in green chemistry. In this study an environmental benign method was investigated for the rapid synthesis of colloidal Ag and AuNPs using the extract of Hydrocotyle asiatica, as a reducing and stabilizing agent under sunlight irradiation. The nanoparticles were formed in few seconds and were characterized by UV-Vis., FT-IR, TEM, EDAX, XRD, DLS and Zetasizer. The nanoparticles were stable in aqueous solution for more than 6 months. TEM analysis established that the Ag and AuNPs were predominantly spherical with average size of 21 and 8 nm, respectively. The flavonoids and glycosides from the extract of H. asiatica were proved to be responsible for the reduction and capping through FT-IR analysis. The antimicrobial studies of AgNPs showed effective inhibitory activity against the clinical strains of gram-negative and positive bacteria. The localized surface plasmon resonance of AgNPs was used for the photo-driven degradation of cationic dyes (malachite green and methylene blue). Thus, this green technique can be used for bulk production of AgNPs, and thus prepared nanoparticles may be used for removal of dyes from effluent. Graphical Abstract

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“…Different fungi like Fusarium oxysporum [10], Cladosporium cladosporioides [11], Fusarium semitactum [12], plants like Syzygium aromaticum [13], Medicago sativa [14], Azadirachta indica [15], Terminalia cuneata [16], and Trignellafoenum graecum seeds [17] have been employed to synthesize metal nanoparticles. Recently, sunlight-induced rapid synthesis of silver nanoparticles has been reported by our group [18,19]. Biosynthesis of silver nanoparticles using bark of Cinnamon zeylanicum [20], Piper nigrum [21], Breynia rhamnoides [22], Avicennia marina [23], Callicarpa maingayi [24], Cissus quadrangularis [25], Artocarpus elasticus [26], and Saraca indica [27] has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant, antimicrobial and cytotoxic activities of silver and gold nanoparticles synthesized using Plumbago zeylanica bark

2016

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Utilization of bioresources for the synthesis of metal nanoparticles is the latest field in green chemistry. The present work reports the utilization of the aqueous bark extract of Plumbago zeylanica for the biosynthesis of Ag and Au NPs. The Ag and Au NPs thus obtained were characterized by UV-Vis, FT-IR, TEM, XRD, and EDAX analysis. The water-soluble components of the extract were responsible for the reduction of Ag ? and Au 3? ions. FT-IR spectra revealed that the -OH and [C=O groups present in the biomolecules were responsible for reduction and stabilization of nanoparticles. TEM images showed the existence of spherical Ag and Au NPs with average size of 28.47 and 16.89 nm, respectively, which was further substantiated by XRD analysis. The presence of elemental Ag and Au along with C and O from the attached biomolecules was proved by EDAX analysis. The antimicrobial, antioxidant, and in vitro cytotoxic activities of the synthesized nanoparticles were studied by disc diffusion, DPPH, and MTT assay methods, respectively. The free radical inhibition was found to be 78.17 and 87.34 % for Ag and Au nanoparticles, respectively. The Ag and Au NPs showed 61.56 and 65.61 % toxicity against DLA cell line, respectively. The DNA binding ability of Ag and Au NPs were investigated using CT-DNA. The hyperchromism shift inferred the groove binding of nanoparticles with CT-DNA.

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Sunlight Induced Rapid Synthesis And Kinetics Of Silver Nanoparticles Using Leaf Extract Of Achyranthes Aspera L. And Their Antimicrobial Applications

Cited by 30 publications

References 0 publications

Photobiologic-mediated fabrication of silver nanoparticles with antibacterial activity

Photobiologic-mediated fabrication of silver nanoparticles with antibacterial activity

Photobiological synthesis of noble metal nanoparticles using Hydrocotyle asiatica and application as catalyst for the photodegradation of cationic dyes

Antioxidant, antimicrobial and cytotoxic activities of silver and gold nanoparticles synthesized using Plumbago zeylanica bark

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