Enhanced sensing of mercuric ions based on dinucleotide-functionalized silver nanoparticles

Maduraiveeran, Govindhan; Ramaraj, Ramasamy

doi:10.1039/c6ay02306a

Cited by 10 publications

(5 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using biomolecules as a reducing agent for nanoparticle synthesis is a fast-growing area of research. − The various biosynthetic routes applied so far have opened the possibility for developing an economical and environmentally friendly method compared with conventional hazardous inorganic reducing agents such as sodium borohydride . Among the various types of biosynthesized nanoparticles reported, − silver nanoparticles (AgNPs) stand out for their antibacterial activity − and account for an integral part in next generation sensors, , optical devices, and catalysis . However, the majority of green synthesis works conducted so far have concentrated on a proof-of-concept for AgNP formation from plant extracts, , bacteria, or fungi .…”

Section: Introductionmentioning

confidence: 99%

Does Nitrate Reductase Play a Role in Silver Nanoparticle Synthesis? Evidence for NADPH as the Sole Reducing Agent

Hietzschold

Walter

Davis

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

A leading hypothesis for silver nanoparticle biosynthesis suggests that the enzyme nitrate reductase plays a key role in the process, assisted by the coenzyme nicotinamide adenine dinucleotide phosphate (NADPH). Here, we show that NADPH alone can act as the reducing agent of silver nitrate salt to form silver nanoparticles. In fact, the addition of nitrate reductase during the synthesis causes a decrease in the reaction rate and broadening of the size distribution of the particles. The NADPH-synthesized particles were monodispersed with a mean radius of 5.1 ± 1.0 nm, as indicated by transmission electron microscopy (TEM) imaging and supported further by in situ single entity electrochemistry. The bottom-up molecular approach enabled facile purification of the nanoparticles, and the minimal components allowed the determination of the kinetic parameters of the reaction. The kinetics of the biomolecular synthesis is shown to be a pseudo-first-order reaction with respect to NADPH with a rate constant of 6.6 × 10–3 s–1 at 25 °C. Finally, using 1 mM NADPH, the reaction was 90% completed within 7 minutes when run at 80 °C. These mechanistic insights provide a deeper understanding toward the future realization of environmentally friendly, rapid, and low-cost biomolecular synthesis agents for monodispersed nanoparticles.

show abstract

Section: Introductionmentioning

confidence: 99%

Does Nitrate Reductase Play a Role in Silver Nanoparticle Synthesis? Evidence for NADPH as the Sole Reducing Agent

Hietzschold

Walter

Davis

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…This way, detection of very low environmentally relevant Hg contents is possible. Several sensing systems have been already reported based on the interaction between AgNPs and Hg(II) ions [23][24][25][26][27][28][29][30][31][32]; however, detailed study of Hg behavior in the presence of another competitive oxidant is rarely performed and discussed. A dual functional sensor for determination of Hg and H 2 O 2 has been developed based on a similar approach: addition of H 2 O 2 to a mixture of AgNPs and Hg(II) ions [33].…”

Section: Introductionmentioning

confidence: 99%

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Vasileva

Alexandrova

Karadjova

2017

Journal of Chemistry

View full text Add to dashboard Cite

, and Ni 2+ ) do not interfere under the same conditions, due to the absence of oxidative activity of these ions, which guarantees the high selectivity of the proposed optical sensor towards Hg 2+ . The limits of detection and quantification were found to be 0.9 g L −1 and 2.7 g L −1 , respectively, and relative standard deviations varied in the range 9-12% for Hg content from 0.9 to 12.5 g L −1 and 5-9% for Hg levels from 25 to 500 g L −1 . The method was validated by analysis of CRM Estuarine Water BCR505. A possible mechanism of interaction between AgNPs and Hg 2+ for both concentration ranges was proposed on the basis of UV-Vis, TEM, and SAED analyses.

show abstract

“…The exact mechanism of AgNP formation using biological systems is still a matter of debate. Some scientific groups claim that nitrate reductase is the main enzyme involved in the reduction of Ag + and the subsequent formation of AgNPs [ 25 , 43 , 44 ], while others claim that the reduction of Ag + occurs independently of nitrate reductase, involving only NAD(P)H [ 45 , 46 ]. In this study, we demonstrated that NADH alone is not sufficient for the efficient synthesis of AgNPs.…”

Section: Discussionmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles Produced Using Geobacillus spp. Bacteria

et al. 2023

View full text Add to dashboard Cite

Silver nanoparticles (AgNPs) are well known for their unique physical and chemical properties, which can be incorporated into a wide range of applications. The growing resistance of microorganisms to antimicrobial compounds promoted the use of AgNPs in antimicrobial therapy. AgNPs can be obtained using physical and chemical methods, but these technologies are highly unfriendly to nature and produce large amounts of side compounds (for example, sodium borohydride and N,N-dimethylformamide). Therefore, alternative technologies are required for obtaining AgNPs. This report focuses on the biosynthesis of silver nanoparticles through the reduction of Ag+ with the cell-free secretomes of four Geobacillus bacterial strains, namely, 18, 25, 95, and 612. Only a few studies that involved Geobacillus bacteria in the synthesis of metal nanoparticles, including AgNPs, have been reported to date. The silver nanoparticles synthesized through bio-based methods were characterized using UV–Vis spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), and zeta potential measurements. UV–Vis spectroscopy showed a characteristic absorbance peak at 410–425 nm, indicative of AgNPs. SEM analysis confirmed that most nanoparticles were spherical. DLS analysis showed that the sizes of the obtained AgNPs were widely distributed, with the majority less than 100 nm in diameter, while the zeta potential values ranged from −25.7 to −31.3 mV and depended on the Geobacillus spp. strain.

show abstract

Enhanced sensing of mercuric ions based on dinucleotide-functionalized silver nanoparticles

Abstract: A facile and green synthesis of NAD-functionalized anisotropic silver nanoparticles for the ultra-sensitive and selective optical detection of mercuric ions in water is demonstrated.

Cited by 10 publications

References 38 publications

Does Nitrate Reductase Play a Role in Silver Nanoparticle Synthesis? Evidence for NADPH as the Sole Reducing Agent

Does Nitrate Reductase Play a Role in Silver Nanoparticle Synthesis? Evidence for NADPH as the Sole Reducing Agent

Application of Starch-Stabilized Silver Nanoparticles as a Colorimetric Sensor for Mercury(II) in 0.005 mol/L Nitric Acid

Biosynthesis of Silver Nanoparticles Produced Using Geobacillus spp. Bacteria

Contact Info

Product

Resources

About