Biologically green synthesized silver nanoparticles as a facile and rapid label-free colorimetric probe for determination of Cu 2+ in water samples

2017 ◽  
Vol 171 ◽  
pp. 297-304 ◽  
Author(s):  
Sedigheh Basiri ◽  
Ali Mehdinia ◽  
Ali Jabbari
Keyword(s):  
Silver Nanoparticles ◽  
Water Samples ◽  
Label Free ◽  
Colorimetric Probe ◽  
Green Synthesized Silver Nanoparticles

scholarly journals Chlortetracycline-Functionalized Silver Nanoparticles as a Colorimetric Probe for Aminoglycosides: Ultrasensitive Determination of Kanamycin and Streptomycin

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 997 ◽  
Author(s):  
Ganesh Dattatraya Saratale ◽  
Rijuta Ganesh Saratale ◽  
Gajanan Ghodake ◽  
Surendra Shinde ◽  
Dae-Young Kim ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Color Change ◽  
Limit Of Detection ◽  
Colorimetric Assay ◽  
Uv Spectroscopy ◽  
Aminoglycoside Antibiotics ◽  
Sensing Element ◽  
Colorimetric Probe ◽  
Aqueous Conditions

Aminoglycosides (AMGs) have been extensively used to treat infectious diseases caused by Gram-negative bacteria in livestock and humans. A selective and sensitive colorimetric probe for the determination of streptomycin and kanamycin was proposed based on chlortetracycline-coated silver nanoparticles (AgNPs–CTC) as the sensing element. Almost all of the tested aminoglycoside antibiotics can rapidly induce the aggregation of AgNPs, along with a color change from yellow to orange/red. The selective detection of aminoglycoside antibiotics, including tobramycin, streptomycin, amikacin, gentamicin, neomycin, and kanamycin, with other types of antibiotics, can be achieved by ultraviolet (UV) spectroscopy. This developed colorimetric assay has ability to detect various AMGs using in-depth surface plasmon resonance (SPR) studies. With this determination of streptomycin and kanamycin was achieved at the picomolar level (pM) by using a UV–visible spectrophotometer. Under aqueous conditions, the linear range of the colorimetric sensor for streptomycin and kanamycin was 1000–1,1000 and 120–480 pM, respectively. The corresponding limit of detection was 2000 pM and 120 pM, respectively. Thus, the validated dual colorimetric and ratiometric method can find various analytical applications for the ultrasensitive and rapid detection of AMG antibiotics in water samples.

Silver Nanoparticles as a New Colorimetric Probe for Determination of Oxalic Acid in Urine

2016 ◽  
Vol 14 (9) ◽  
pp. 906-912 ◽  
Author(s):  
Parisa Fateh Basharzad ◽  
Khalil Farhadi ◽  
Mehrdad Forough ◽  
Rahim Molaei
Keyword(s):  
Silver Nanoparticles ◽  
Oxalic Acid ◽  
Colorimetric Probe

Label-Free Aptamer Fluorescence Determination of Trace Pb2+ Using AuPd Nanoalloy Probe as Catalyst

2013 ◽  
Vol 631-632 ◽  
pp. 18-21 ◽  
Author(s):  
Zhi Liang Jiang ◽  
Mei Ling Tang ◽  
Qing Ye Liu ◽  
Ai Hui Liang
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Fluorescence Intensity ◽  
Water Samples ◽  
Catalytic Effect ◽  
Rhodamine 6G ◽  
Label Free ◽  
Double Stranded Dna ◽  
Fluorescence Determination

In the condition of 1.24 mmol/L EDTANa2, 16.7 mmol/L NaCl and 0.17 mmol/L Tris, the substrate chain of double-stranded DNA (dsDNA) could be cracked by Pb2+ to release single-stranded DNA (ssDNA) that adsorb onto AuPd nanoparticle (AuPdNP) and form stable AuPdNP-ssDNA, but the dsDNA can not protect AuPdNP that were aggregated to big AuPdNP aggregations (AuPdNPA) under the action of NaCl. The AuPdNP-ssDNA and AuPdNPA could be separated by centrifugation. With the concentration of Pb2+ increased, the released ssDNA increased, the AuPdNP-ssDNA in centrifugation solution increased and the catalytic effect enhanced on the fluorescence quenching reaction of Rhodamine 6G (Rh6G) and NaH2PO2, which led the fluorescence intensity at 552nm to decrease. The decreased fluorescence intensity (ΔF552nm) was linear to the concentration of Pb2+ in the range of 0.33-8.00 nmol/L, a detection limit of 0.21 nmol/L. The proposed method was applied to detect Pb2+ in water samples, with satisfactory results.

Determination of very low amounts of free copper and nickel ions in beverages and water samples using cloud point extraction assisted by silver nanoparticles

2015 ◽  
Vol 7 (9) ◽  
pp. 3786-3792 ◽  
Author(s):  
Ignacio López-García ◽  
Yesica Vicente-Martínez ◽  
Manuel Hernández-Córdoba
Keyword(s):  
Silver Nanoparticles ◽  
Cloud Point ◽  
Water Samples ◽  
Cloud Point Extraction ◽  
Rich Phase ◽  
Nickel Ions

Silver nanoparticles act as carriers in the transfer of copper and nickel ions to the surfactant-rich phase obtained in a CPE process.

Detection of Anthracene in Real Water Samples with a Label-Free Amperometric Immunosenor

2011 ◽  
Vol 183-185 ◽  
pp. 547-551 ◽  
Author(s):  
Yan Zhang ◽  
Ping Ge Dian ◽  
Hui Sheng Zhuang
Keyword(s):  
Detection Limit ◽  
Prussian Blue ◽  
Water Samples ◽  
Gold Film ◽  
Polyclonal Antibodies ◽  
Current Response ◽  
Label Free ◽  
Long Term Stability

A label-free amperometric immunosenor for determination of anthracene was developed. Prussian blue was electrodeposited on the glassy carbon electrode and then modified with nanometer-size gold film to protect Prussian blue layer and immobilized anthracene polyclonal antibodies. The characteristics of the modified electrode at different stages of modification were studied by cyclic voltammetry. The performances of the amperometric immunosensor were studied in detail. At the optimal experimental condition, the current response of the immunosensor was proportional to the concentration of anthracene in the range of 1.8~90 ng•mL-1with a detection limit of 0.82 ng•mL-1(S/N=3). The studied immunosensor exhibited low detection limit, long-term stability and easy regenerated. This mothod was applied to the anthracene detection in river water samples with satisfied results.

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