Methylene blue-based distinguishing DNA conformation for colorimetric detection of silver ions

2019 ◽  
Vol 147 ◽  
pp. 995-998 ◽  
Author(s):  
Song Xu ◽  
Xiaojuan Chen ◽  
Xin Chen ◽  
Yong Liang
Keyword(s):  
Methylene Blue ◽  
Colorimetric Detection ◽  
Silver Ions ◽  
Dna Conformation

scholarly journals Degradation of Methylene Blue Using Biologically Synthesized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Vanaja ◽  
K. Paulkumar ◽  
M. Baburaja ◽  
S. Rajeshkumar ◽  
G. Gnanajobitha ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Reaction Medium ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Aqueous Leaf Extract

Nowadays plant mediated synthesis of nanoparticles has great interest and achievement due to its eco-benign and low time consuming properties. In this study silver nanoparticles were successfully synthesized by usingMorinda tinctorialeaf extract under different pH. The aqueous leaf extract was added to silver nitrate solution; the color of the reaction medium was changed from pale yellow to brown and that indicates reduction of silver ions to silver nanoparticles. Thus synthesized silver nanoparticles were characterized by UV-Vis spectrophotometer. Dispersity and morphology was characterized by scanning electron microscope (SEM); crystalline nature and purity of synthesized silver nanoparticles were revealed by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). FTIR spectrum was examined to identify the effective functional molecules responsible for the reduction and stabilization of silver nanoparticles synthesized by leaf extract. The photocatalytic activity of the synthesized silver nanoparticles was examined by degradation of methylene blue under sunlight irradiation. Green synthesized silver nanoparticles were effectively degrading the dye nearly 95% at 72 h of exposure time.

The Mechanism of Osmotic Regulation in Artemia Salina (L.): The Physiology of the Branchiae

1958 ◽  
Vol 35 (1) ◽  
pp. 234-242 ◽  
Author(s):  
P. C. CROGHAN
Keyword(s):  
Methylene Blue ◽  
Silver Ions ◽  
Artemia Salina ◽  
Physiological Effects ◽  
Osmotic Regulation ◽  
External Concentration ◽  
Active Uptake ◽  
Branchial Epithelium ◽  
Nacl Excretion

1. The uptake of silver ions by Artemia has been investigated. The staining is localized to the first ten pairs of branchiae. There is no staining of the eleventh pair or of any other part of the animal. The uptake of silver is due to a purely passive precipitation of AgCl within the thickness of the branchial cuticle. 2. The effects of KMnO4 and methylene-blue solutions have also been studied. Their effect is localized to the epithelium under the cuticle of the first ten pairs of branchiae. 3. It is concluded that all these staining reactions demonstrate that the cuticle over the first ten pairs of branchiae is the only part of the external cuticle that is appreciably permeable. 4. Animals whose branchial epithelium has been damaged by a brief exposure to saturated KMnO4 solution have lost the ability to osmo-regulate. They are closely isotonic with their medium, and the range of external concentration tolerated is much restricted. 5. This isotonicity is not due simply to increased permeability, but is due to specific destruction of the mechanism normally excreting NaCl in hypertonic media. 6. Correlation of the physiological effects of KMnO4 treatment with the sharp localization of damage, and the evidence for localized permeability indicates that the epithelium of the first ten pairs of branchiae is the site of active NaCl excretion in hypertonic media, and probably of active uptake from hypotonic media. 7. The ontogeny of this mechanism is traced. In nauplii the dorsal organ is apparently concerned in NaCl excretion. When the branchiae develop the dorsal organ degenerates.

Sulfhydryl modified β-cyclodextrin/Fe3O4/graphene oxide magnetic nanohybrid for the adsorption of silver ions and cationic dye methylene blue

2021 ◽  
Vol 226 ◽  
pp. 419-430
Author(s):  
Xin Li ◽  
Yingxia Ma ◽  
Xiaofeng Shi ◽  
Xiaoya Kang ◽  
Fengming Bai ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Silver Ions ◽  
Cationic Dye

scholarly journals Synthesis of Fluorescent Copper Nanoparticles and Ultrasensitive Free Label Detection of Ag+

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Ning Wang ◽  
Lu Ga ◽  
Meilin Jia ◽  
Jun Ai
Keyword(s):  
Heavy Metal ◽  
Visible Light ◽  
Linear Relationship ◽  
Fluorescent Probe ◽  
Copper Nanoparticles ◽  
Colorimetric Detection ◽  
Silver Ions ◽  
Simple Method ◽  
Environmental Detection

In recent years, the application of fluorescent copper nanomaterials in environmental detection has attracted much attention. This paper mainly introduces the synthesis of copper nanomaterials and the detection of Ag+. A simple method for the determination of Ag+ in water was established by using fluorescent copper nanoparticles synthesized by using glucose (Glc) as a reducing agent as a fluorescent probe. The experimental mechanism of this experiment is that silver ions can rapidly and effectively quench the fluorescence of Glc-CuNPs. A good linear relationship was observed in the range of Ag+ at 100 mol/L–600 mol/L (R=0.9845); the color is gradually enhanced under visible light and visual colorimetric detection. Moreover, the Glc-CuNP sensor selectively selected Ag+, which was not affected by other metal ions, indicating that Glc-CuNPs had good selectivity for the detection of Ag+. Based on this, Glc-CuNP completes the detection of heavy metal silver ions and has a good application prospect in environmental detection.

Facile Colorimetric Detection of Silver Ions with Picomolar Sensitivity

2017 ◽  
Vol 89 (6) ◽  
pp. 3622-3629 ◽  
Author(s):  
Zhuangqiang Gao ◽  
Grace G. Liu ◽  
Haihang Ye ◽  
Robert Rauschendorfer ◽  
Dianping Tang ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Silver Ions

Au-Pd alloy nanoparticles catalyze the colorimetric detection of hydrazine with methylene blue

2019 ◽  
Vol 107 ◽  
pp. 107455
Author(s):  
Wei Liu ◽  
Guangchao Zheng ◽  
Wing-Leung Wong ◽  
Kwok-Yin Wong
Keyword(s):  
Methylene Blue ◽  
Colorimetric Detection ◽  
Alloy Nanoparticles ◽  
Pd Alloy

A Simple and Sensitive Colorimetric Detection of Silver Ions Based on Cationic Polymer-Directed AuNPs Aggregation

2013 ◽  
Vol 66 (1) ◽  
pp. 113 ◽  
Author(s):  
Faze Wang ◽  
Yuangen Wu ◽  
Shenshan Zhan ◽  
Lan He ◽  
Wenting Zhi ◽  
...  
Keyword(s):  
Metal Ions ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Silver Ions ◽  
Cationic Polymer ◽  
Charge Balance ◽  
Remarkable Change ◽  
Sensing Platform ◽  
Sensitivity And Selectivity ◽  
Positively Charged

This paper describes a simple and sensitive colorimetric sensor employing single-stranded DNA (ssDNA) ligand, cationic polymer, and gold nanoparticles (AuNPs) to detect silver ions. The positively charged polymer can electrostatically interact with ssDNA and destroy the charge balance leading to induction of AuNP aggregation. Silver ions (Ag+) can bind to cytosine (C)-rich nucleic acids to form the C-Ag+-C hair-pin structure, which can prevent its interaction with polymers. The resulting cationic polymer could aggregate AuNPs causing a remarkable change in colour. The concentration of Ag+ can be determined visually. This sensing platform exhibits high sensitivity and selectivity towards Ag+ versus other metal ions, with a detection limit of 48.6 nM. The assay did not require any labelling or modifying steps. This method is simple, effective, and convenient and can in principle be used to detect other metal ions or small molecules.

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