scholarly journals A new detection tube to detect hydrogen cyanide in the air

2014 ◽  
Vol 20 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Vladimír Pitschmann ◽  
Zbyněk Kobliha ◽  
Ivana Tusarová ◽  
Lucie Bártová ◽  
David Vetchý ◽  
...  
Keyword(s):  
Composite Material ◽  
Detection Limit ◽  
Microcrystalline Cellulose ◽  
Hydrogen Cyanide ◽  
Sensitive Detection ◽  
Visual Evaluation ◽  
Naked Eye ◽  
Colored Product

A new simple and sensitive detection tube to detect hydrogen cyanide in the air has been developed. The detection tube is based on the reaction of hydrogen cyanide with 4-nitrobenzil to form a violet colored product. The reaction takes place on the carrier made of a composite material which was prepared by pelletization of a mixture of microcrystalline cellulose and MgO. The detection tube can detect hydrogen cyanide in the air in the range of concentrations 0.1-100 mg.m-3 based on visual evaluation (by naked eye) of the change of indication layer coloring and comparison with etalon. The detection limit is 0.05 mg.m-3. The detection tube is highly selective and sufficiently stable during storage.

scholarly journals Detection tube with composite carrier for detection of phosgene and diphosgene in air

2012 ◽  
Vol 66 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Vladimír Pitschmann ◽  
Ivana Tusarová ◽  
Zbyněk Kobliha ◽  
David Vetchý
Keyword(s):  
Composite Material ◽  
Air Quality ◽  
Detection Limit ◽  
Chemical Reaction ◽  
Microcrystalline Cellulose ◽  
Continuous Monitoring ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Composite Carrier

A new highly sensitive detection tube for measurement of concentration of phosgene and diphosgene in air has been developed. The detection is based on chemical reaction of 4-(p-nitrobenzyl)pyridine and N-phenylbenzylamine which with phosgene (diphosgene) give characteristic red methine dye. As a carrier serves spherical granules (pellets) of composite material prepared by granulation of microcrystalline cellulose with MgO. This new indication filling is stable, resistant to interferences and climatic influences. The detection limit (0.05 mg.m-3) meets the requirements for conducting hygienic checks of air quality in the workplace environment. In addition, the tube allows a prolonged and continuous monitoring of phosgene and diphosgene in air for at least 240 minutes.

scholarly journals Colorimetric Technique for Antimony Detection Based on the Use of Gold Nanoparticles Conjugated with Poly-A Oligonucleotide

2019 ◽  
Vol 9 (22) ◽  
pp. 4782
Author(s):  
Berlina ◽  
Komova ◽  
Zherdev ◽  
Gaur ◽  
Dzantiev
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Gold Nanoparticle ◽  
Variation Coefficient ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Nanoparticle Surface ◽  
Colorimetric Measurements ◽  
Target Analyte

A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ions based on the use of gold nanoparticles conjugated with oligonucleotide (poly-A sequence) is developed. Colorimetric measurements reveal that the aggregates of modified gold nanoparticles were afforded after adding antimony ions, thus changing the solution color from pink to blue. The results of aptamer’s interaction on the gold nanoparticle surface with the target analyte can be detected either by photometry or by the naked eye. The realized assay provides rapid (2 min), sensitive (detection limit 10 ng/mL), specific, and precise (variation coefficient less than 3.8%) detection of antimony (III) in drinking water.

scholarly journals A Flexible Chemosensor Based on Colorimetric and Fluorescent Dual Modes for Rapid and Sensitive Detection of Hypochlorite Anion

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8082
Author(s):  
Qin Wu ◽  
Tao Tao ◽  
Yunxia Zhao ◽  
Wei Huang
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
Visual Detection ◽  
Blue Shift ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Fluorescence Color ◽  
Spectroscopic Instrumentation ◽  
Light Green ◽  
Hypochlorite Anion

A flexible chemosensor has been developed based on colorimetric and fluorescent dual modes using tetraphenylethylene-centered tetraaniline (TPE4A) for rapid and sensitive detection of hypochlorite anion. The fluorescent probe TPE4A exhibits a unique aggregation-induced emission (AIE) character which is proved by a blue shift of the fluorescent peak from 544 to 474 nm with the water equivalents increasing. With the addition of hypochlorite in solution, the absorbance of the probe changes and the responding fluorescence color can be observed to change from light green to purple. The detection limit of hypochlorite is 1.80 × 10−4 M in solution, and the visual detection limit is 1.27 µg/cm2 with the naked eye for the flexible paper-based chemosensor. The proposed flexible chemosensors show a good selectivity and sensitivity which has great potential for effective detection of hypochlorite anions without any spectroscopic instrumentation.

scholarly journals Colorimetric Technique for Antimony Detection Based on the Use of Gold Nanoparticles Conjugated with Poly-A Oligonucleotide

2019 ◽  
Author(s):  
Anna N. Berlina ◽  
Nadezhda S. Komova ◽  
Anatoly V. Zherdev ◽  
Mulayam S. Gaur ◽  
Boris B. Dzantiev
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Gold Nanoparticle ◽  
Variation Coefficient ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Nanoparticle Surface ◽  
Colorimetric Measurements ◽  
Target Analyte

A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ions based on the use of gold nanoparticles conjugated with oligonucleotide (poly-A sequence) is developed. Colorimetric measurements reveal that the aggregates of modified gold nanoparticles were afforded after adding antimony ions, thus changing the solution color from pink to blue. The results of aptamer’s interaction on the gold nanoparticle surface with target analyte can be detected either by photometry or by the naked eye. The realized assay provides rapid (2 min), sensitive (detection limit 10 ng/mL), specific, and precise (variation coefficient less than 3.8%) detection of antimony (III) in drinking water

Naked-eye colorimetric detection of HCV RNA mediated by a 5′ UTR-targeted antisense oligonucleotide and plasmonic gold nanoparticles

The Analyst ◽  
2021 ◽  
Author(s):  
Almas Shamaila Mohammed ◽  
Aniket Balapure ◽  
Mahammad Nanne Khaja ◽  
Ramakrishnan Ganesan ◽  
Jayati Ray Dutta
Keyword(s):  
Gold Nanoparticles ◽  
Antisense Oligonucleotide ◽  
Early Stage ◽  
Colorimetric Detection ◽  
Sensitive Detection ◽  
Clinical Samples ◽  
Hcv Rna ◽  
Naked Eye

An Au NP based facile strategy for the rapid, early-stage, and sensitive detection of HCV RNA in clinical samples which avoids thiol tagging to the antisense oligonucleotide and expensive infrastructure is presented.

scholarly journals DEVELOPMENT OF FLOW INJECTION METHOD FOR ONLINE DETERMINATION OF THIOCYANATE BASED ON OXIDATION BY PERMANGANATE

2010 ◽  
Vol 10 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Hermin Sulistyarti ◽  
Spas D. Kolev ◽  
Stephanie Lim
Keyword(s):  
Detection Limit ◽  
Thyroid Gland ◽  
Flow Injection ◽  
Hydrogen Cyanide ◽  
Figures Of Merit ◽  
Sample Throughput ◽  
Teflon Membrane ◽  
Developing Method ◽  
Analytical Figures Of Merit

The importance of developing method for thiocyanate becomes obvious, because thiocyanate can inhibit iodine uptake of thyroid gland leading to mumps disease. In this work, thiocyanate is oxidized by permanganate in the acid donor stream to cyanide, which is directly converted to hydrogen cyanide. Then, hydrogen cyanide diffuses through a Teflon membrane into acceptor stream containing nickel(II) in ammoniacal buffer to form tetracyanonickelate(II) which is detected spectrophotometrically at 267 nm. Analytical figures of merit were linear up to 50 mg L-1 for thiocyanate, with RSD of 1.34%, and detection limit of 0.07 mg L-1, respectively. Interfering anions were eliminated under stoichiometric amount of permanganate and sample throughput was 20 h-1. The method was validated for determining thiocyanate samples from synthetic and gold process waters with satisfactory results.   Keywords: Thiocyanate, flow injection, permanganate, spectrophotometry

Naked-eye and ratiometric fluorescence probe for fast and sensitive detection of hydrogen sulfide and its application in bioimaging

2018 ◽  
Vol 42 (23) ◽  
pp. 19272-19278 ◽  
Author(s):  
Jianlong Ma ◽  
Feifei Li ◽  
Qiang Li ◽  
Yijing Li ◽  
Chaoxian Yan ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Hela Cells ◽  
Fluorescence Probe ◽  
Sensitive Detection ◽  
Ratiometric Fluorescence ◽  
Naked Eye

A sensitive and ultrafast ratiometric fluorescence probe for the detection of hydrogen sulfide (H2S) in HeLa cells and zebrafish.

A highly sensitive naked-eye fluorescent probe for trace hydrazine based on ‘C-CN’ bond cleavage

The Analyst ◽  
2018 ◽  
Vol 143 (18) ◽  
pp. 4354-4358 ◽  
Author(s):  
Hai Xu ◽  
Zhen Huang ◽  
Yaqian Li ◽  
Biao Gu ◽  
Zile Zhou ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
Water Samples ◽  
Bond Cleavage ◽  
Eye Detection ◽  
Naked Eye ◽  
Real Water Samples ◽  
Highly Sensitive ◽  
First Time ◽  
Naked Eye Detection

The ‘C–CN’ bond cleavage was applied to the recognition of N2H4 for the first time; the obvious change in color could be used for “naked-eye” detection; the corresponding detection limit was found to be 5.81 × 10−8 M (1.65 ppb); the probe could be applied for N2H4 detection in real water samples.

scholarly journals A Turn-On Fluorescent Probe for Sensitive Detection of Cysteine in a Fully Aqueous Environment and in Living Cells

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaohua Ma ◽  
Guoguang Wu ◽  
Yuehua Zhao ◽  
Zibo Yuan ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
High Selectivity ◽  
Coumarin Derivative ◽  
Living Cells ◽  
Sensitive Detection ◽  
Aqueous Environment ◽  
Test Probe ◽  
Aqueous Buffer ◽  
Turn On

We reported here a turn-on fluorescent probe (1) for the detection of cysteine (Cys) by incorporating the recognition unit of 2,4-dinitrobenzenesulfonyl ester (DNBS) to a coumarin derivative. The structure of the obtained probe was confirmed by NMR and HRMS techniques. The probe shows a remarkable fluorescence off-on response (∼52-fold) by the reaction with Cys in 100% aqueous buffer. The sensing mechanism was verified by the HPLC test. Probe 1 also displays high selectivity towards Cys. The detection limit was calculated to be 23 nM. Moreover, cellular experiments demonstrated that the probe is highly biocompatible and can be used for monitoring intracellular Cys.

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