scholarly journals Chromo-luminescent selective detection of fluoride ions by a copper(ii) bis(terpyridine) complex solution via a displacement approach

2018 ◽  
Vol 17 (6) ◽  
pp. 815-821 ◽  
Author(s):  
Aditya Kumar Purohit ◽  
Subrata Kumar Padhan ◽  
Jamini Ranjan Mohanty ◽  
Pravin Kumar Kar
Keyword(s):  
Drinking Water ◽  
Detection Method ◽  
Limit Of Detection ◽  
Selective Detection ◽  
Complex Solution ◽  
Dual Mode ◽  
Fluoride Ions ◽  
Mode Detection ◽  
Displacement Approach ◽  
First Time

(1) For the first time a terpyrideine-Cu(ii) complex was used for the selective detection of F− ions. (2) A dual mode detection method comprising chromo-luminescent techniques was used to evaluate the sensing mechanism. (3) The limit of detection was found to be 5.07 μM which is within the permissible level of F− ions in drinking water according to the WHO.

A Simple and Efficient Schiff Base Derived Chemosensor for Selective Detection of Fluoride Ion

2021 ◽  
Vol 23 (09) ◽  
pp. 646-655
Author(s):  
Fazlur Rahaman ◽  
◽  
Prabhat Gautam ◽  
Priti Gupta ◽  
Subrata Mondal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Limit Of Detection ◽  
Fluoride Ion ◽  
Selective Detection ◽  
Fluoride Ions ◽  
Anion Sensing ◽  
Vis Spectroscopy ◽  
Absorption Studies ◽  
Two Peaks ◽  
High Degree

A new thiazole substituted chemosensor 1 has been designed and synthesized for selective detection of fluoride ions. The chemosensor 1 was characterized by 1H NMR and 13C NMR. The absorption studies of chemosensor in DMF exhibits two peaks at 283 nm and 327 nm. The anion sensing behaviour of chemosensor 1 for various anions (I-, Cl-, Br-, NO3-, HSO4-, PF6-, ClO4-) in DMF were investigated by UV-vis spectroscopy. Chemosensor 1 exhibited high degree of selectivity for fluoride ions over other anions. A good linearity in the range of 16-133 μM with 6.12 μM limit of detection value (LOD) was observed.

Strong catalysis of silver-doped carbon nitride nanoparticles and their application to aptamer SERS and RRS coupled dual-mode detection of ultra-trace K+

2020 ◽  
Vol 8 (32) ◽  
pp. 11088-11101
Author(s):  
Chongning Li ◽  
Dongmei Yao ◽  
Xin Jiang ◽  
Aihui Liang ◽  
Zhiliang Jiang
Keyword(s):  
Carbon Nitride ◽  
Detection Method ◽  
Dual Mode ◽  
Mode Detection ◽  
Ultra Trace

The aptamer-mediated SERS and RRS dual-mode detection method of K+ was accurate and sensitive.

Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

2018 ◽  
Vol 9 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Shubhangi J. Mane-Gavade ◽  
Sandip R. Sabale ◽  
Xiao-Ying Yu ◽  
Gurunath H. Nikam ◽  
Bhaskar V. Tamhankar
Keyword(s):  
Green Synthesis ◽  
Color Change ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Suitable Condition ◽  
Cost Effective ◽  
Spectroscopic Studies ◽  
Calibration Plot ◽  
First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

scholarly journals Highly sensitive and selective colorimetric detection of dual metal ions (Hg2+ and Sn2+) in water: an eco-friendly approach

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14700-14709
Author(s):  
Rintumoni Paw ◽  
Moushumi Hazarika ◽  
Purna K. Boruah ◽  
Amlan Jyoti Kalita ◽  
Ankur K. Guha ◽  
...  
Keyword(s):  
Metal Ions ◽  
Ag Nanoparticles ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Garlic Extract ◽  
Selective Detection ◽  
Highly Sensitive ◽  
Dual Metal

Synthesis of Ag nanoparticles using Allin based garlic extract for highly sensitive and selective detection of metal ions Hg2+ and Sn2+ in water. The limit of detection (LoD) for Hg2+ and Sn2+ ions were found as 15.7 nM and 11.25 nM respectively.

scholarly journals A simple and cost-effective paper-based and colorimetric dual-mode detection of arsenic(iii) and lead(ii) based on glucose-functionalized gold nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20769-20780
Author(s):  
Bhuneshwari Sahu ◽  
Ramsingh Kurrey ◽  
Manas Kanti Deb ◽  
Kamlesh Shrivas ◽  
Indrapal Karbhal ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Cost Effective ◽  
Dual Mode ◽  
Functionalized Gold Nanoparticles ◽  
Mode Detection ◽  
Optimized Conditions

We report a simple and cost-effective paper-based and colorimetric dual-mode detection of As(iii) and Pb(ii) based on glucose-functionalized gold nanoparticles under optimized conditions.

scholarly journals Immobilization-Free Electrochemical Sensor Coupled with a Graphene-Oxide-Based Aptasensor for Glycated Albumin Detection

Biosensors ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 85
Author(s):  
Wassa Waiwinya ◽  
Thitirat Putnin ◽  
Dechnarong Pimalai ◽  
Wireeya Chawjiraphan ◽  
Nuankanya Sathirapongsasuti ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Detection Method ◽  
Limit Of Detection ◽  
Glycated Albumin ◽  
Cost Effective ◽  
Logarithmic Scale ◽  
Electrochemical Aptasensor ◽  
Alternative Approach

An immobilization-free electrochemical sensor coupled with a graphene oxide (GO)-based aptasensor was developed for glycated human serum albumin (GHSA) detection. The concentration of GHSA was monitored by measuring the electrochemical response of free GO and aptamer-bound GO in the presence of glycated albumin; their currents served as the analytical signals. The electrochemical aptasensor exhibited good performance with a base-10 logarithmic scale. The calibration curve was achieved in the range of 0.01–50 µg/mL. The limit of detection (LOD) was 8.70 ng/mL. The developed method was considered a one-drop measurement process because a fabrication step and the probe-immobilization process were not required. This simple sensor offers a cost-effective, rapid, and sensitive detection method, and could be an alternative approach for determination of GHSA levels.

scholarly journals Perchlorate Levels in Polish Water Samples of Various Origin

Separations ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 37
Author(s):  
Przemysław Niziński ◽  
Patrycja Wiśniewska ◽  
Joanna Kończyk ◽  
Rajmund Michalski
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Limit Of Detection ◽  
Primary Objective ◽  
Swimming Pool ◽  
Limit Of Quantification ◽  
Reliable Determination ◽  
Pool Water ◽  
Drinking Waters ◽  
Swimming Pool Water

Perchlorate ion (ClO4−) is known as a potent endocrine disruptor and exposure to this compound can result in serious health issues. It has been found in drinking water, swimming pools, and surface water in many countries, however, its occurrence in the environment is still poorly understood. The information on perchlorate contamination of Polish waters is very limited. The primary objective of this study was to assess ClO4− content in bottled, tap, river, and swimming pool water samples from different regions of Poland and provide some data on the presence of perchlorate. We have examined samples of bottled, river, municipal, and swimming pool water using the IC–CD (ion chromatography–conductivity detection) method. Limit of detection and limit of quantification were 0.43 µg/L and 1.42 µg/L, respectively, and they were both above the current health advisory levels in drinking water. The concentration of perchlorate were found to be 3.12 µg/L in one river water sample and from 6.38 to 8.14 µg/L in swimming pool water samples. Importantly, the level of perchlorate was below the limit of detection (LOD) in all bottled water samples. The results have shown that the determined perchlorate contamination in Polish drinking waters seems to be small, nevertheless, further studies are required on surface and river samples. The inexpensive, fast, and sensitive IC–CD method used in this study allowed for a reliable determination of perchlorate in the analyzed samples. To the best of our knowledge, there are no other studies seeking to assess the perchlorate content in Polish waters.

scholarly journals Surface Plasmon Resonance Assay for Label-Free and Selective Detection of HIV-1 p24 Protein

Biosensors ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 180
Author(s):  
Lucia Sarcina ◽  
Giuseppe Felice Mangiatordi ◽  
Fabrizio Torricelli ◽  
Paolo Bollella ◽  
Zahra Gounani ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Covalent Binding ◽  
Hiv Infections ◽  
Selectivity Ratio ◽  
Selective Detection ◽  
Label Free ◽  
Self Assembled Monolayer ◽  
Label Free Detection ◽  
P24 Protein ◽  
Hiv 1

The early detection of the human immunodeficiency virus (HIV) is of paramount importance to achieve efficient therapeutic treatment and limit the disease spreading. In this perspective, the assessment of biosensing assay for the HIV-1 p24 capsid protein plays a pivotal role in the timely and selective detection of HIV infections. In this study, multi-parameter-SPR has been used to develop a reliable and label-free detection method for HIV-1 p24 protein. Remarkably, both physical and chemical immobilization of mouse monoclonal antibodies against HIV-1 p24 on the SPR gold detecting surface have been characterized for the first time. The two immobilization techniques returned a capturing antibody surface coverage as high as (7.5 ± 0.3) × 1011 molecule/cm2 and (2.4 ± 0.6) × 1011 molecule/cm2, respectively. However, the covalent binding of the capturing antibodies through a mixed self-assembled monolayer (SAM) of alkanethiols led to a doubling of the p24 binding signal. Moreover, from the modeling of the dose-response curve, an equilibrium dissociation constant KD of 5.30 × 10−9 M was computed for the assay performed on the SAM modified surface compared to a much larger KD of 7.46 × 10−5 M extracted for the physisorbed antibodies. The chemically modified system was also characterized in terms of sensitivity and selectivity, reaching a limit of detection of (4.1 ± 0.5) nM and an unprecedented selectivity ratio of 0.02.

Dual-mode Detection of Dopamine Based on Enhanced Fluorescent and Colorimetric Signals of Fe 3+ -H 2 O 2 - o -Phenylenediamine System

2018 ◽  
Vol 46 (8) ◽  
pp. 1231-1237 ◽  
Author(s):  
Chuan-Xia CHEN ◽  
Peng-Juan NI ◽  
Yuan-Yuan JIANG ◽  
Zhen-Lu ZHAO ◽  
Yi-Zhong LU
Keyword(s):  
Dual Mode ◽  
Mode Detection
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