scholarly journals A Fluorescence Sensing Determination of 2, 4, 6-Trinitrophenol Based on Cationic Water-Soluble Pillar[6]arene Graphene Nanocomposite

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 91 ◽  
Author(s):  
Xiaoping Tan ◽  
Tingying Zhang ◽  
Wenjie Zeng ◽  
Shuhua He ◽  
Xi Liu ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Fluorescence Probe ◽  
Water Soluble ◽  
Fluorescence Sensing ◽  
Sensing Platform ◽  
Reduced Graphene ◽  
Potential Applications ◽  
Water And Soil Samples ◽  
Graphene Nanocomposite

We describe a selective and sensitive fluorescence platform for the detection of trinitrophenol (TNP) based on competitive host–guest recognition between pyridine-functionalized pillar[6]arene (PCP6) and a probe (acridine orange, AO) that used PCP6-functionalized reduced graphene (PCP6-rGO) as the receptor. TNP is an electron-deficient and negative molecule, which is captured by PCP6 via electrostatic interactions and π–π interactions. Therefore, a selective and sensitive fluorescence probe for TNP detection is developed. It has a low detection limit of 0.0035 μM (S/N = 3) and a wider linear response of 0.01–5.0 and 5.0–125.0 for TNP. The sensing platform is also used to test TNP in two water and soil samples with satisfying results. This suggests that this approach has potential applications for the determination of TNP.

scholarly journals A Facile and High Selectivity Novel Fluorescence Sensing Determination of 2, 4, 6-Trinitrophenol Based on Cationic Water-Soluble Pillar[6]arene Graphene Nanocomposite

2018 ◽  
Author(s):  
Xiaoping Tan ◽  
Tingying Zhang ◽  
Wenjie Zeng ◽  
Shuhua He ◽  
Xi Liu ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Water Soluble ◽  
Fluorescence Sensing ◽  
Sensing Platform ◽  
Reduced Graphene ◽  
Potential Applications ◽  
Water And Soil Samples ◽  
Graphene Nanocomposite ◽  
Pi Interactions

We describe a selective and sensitive fluorescence platform for the detection of trinitrophenol (TNP) based on competitive host–guest recognition between pyridine-functionalized pillar[6]arene (PCP6) and probe (acridine orange, AO) that used PCP6-functionalized reduced graphene (PCP6-rGO) as the receptor. TNP is an electron-deficient and negative molecule which is captured by PCP6 via electrostatic interactions and π-π interactions. Therefore, a selective and sensitive fluorescence sensor for TNP detection is developed. It has a low detection limit of 0.0035 μM (S/N=3) and a wider linear response of 0.01−5.0 and 5.0−125.0 for TNP. The sensing platform is also used to test TNP in two water and soil samples with satisfying results. This suggests that this approach has potential applications for the determination of TNP.

scholarly journals Label-Free Fluorescent Determination of Sunset Yellow in Soft Drinks Based on an Indicator-Displacement Assay

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Shilian Wu ◽  
Yanqiong Zhang ◽  
Long Yang ◽  
Can-Peng Li
Keyword(s):  
Epigallocatechin Gallate ◽  
Label Free ◽  
Fluorescence Sensing ◽  
Sunset Yellow ◽  
Sensing Platform ◽  
Potential Applications ◽  
Displacement Assay ◽  
Signal Probe ◽  
Target Molecules

This work reported a fluorescence sensing platform for Sunset Yellow (SY) determination based on competitive host-guest interaction between cucurbit[7]uril (CB7) and signal probe/target molecules. Luteolin/epigallocatechin gallate (EGCG) and SY were selected as the probe and target molecules, respectively. When luteolin or EGCG entered the CB7 host, its fluorescence significantly improved. However, upon the presence of SY in the performed luteolin·CB7 or EGCG·CB7 complex, this led to a remarkable decrease in fluorescence. This result was due to the fact that the binding constant of CB7/SY (4.9×104 M−1) was greater than that of CB7/luteolin (3.2×103 M−1) or CB7/EGCG (4.8×103 M−1). The fluorescence intensities of CB7/luteolin and CB7/EGCG complexes decreased linearly with increased SY concentration ranges of 0.5–50.0 and 2.0–50.0 μM. The proposed method had detection limits of 0.12 and 0.45 μM and was successfully used to determine SY samples with good recoveries ranging from 96.3% to 103.8%. This competitive mode provided a promising fluorescence assay strategy for potential applications in food safety.

scholarly journals Ultrasensitive electrochemical detection of methyl parathion pesticide based on cationic water-soluble pillar[5]arene and reduced graphene nanocomposite

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 345-353 ◽  
Author(s):  
Xiaoping Tan ◽  
Yan Liu ◽  
Tingying Zhang ◽  
Shasha Luo ◽  
Xi Liu ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Methyl Parathion ◽  
Water Soluble ◽  
Electrochemical Sensing ◽  
Sensing Platform ◽  
Reduced Graphene ◽  
Graphene Nanocomposite

A promising electrochemical sensing platform for the detection of methyl parathion based on cationic water-soluble pillar[5]arene reduced graphene nanocomposite.

scholarly journals Novel Competitive Fluorescence Sensing Platform for L-Carnitine Based on Cationic Pillar[5]arene Modified Gold Nanoparticles

2018 ◽  
Author(s):  
Xiaoping Tan ◽  
Yang Yang ◽  
Shasha Luo ◽  
Zhong Zhang ◽  
Wenjie Zeng ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Drugs Of Abuse ◽  
Hydrophobic Interactions ◽  
Molecular Size ◽  
High Sensitivity ◽  
Fluorescence Sensing ◽  
Safety Issues ◽  
Sensing Platform ◽  
Potential Applications ◽  
Sensitivity And Selectivity

A supramolecular host-guest interaction and sensing between cationic pillar[5]arenes (CP5) and L-carnitine were developed by the competitive host-guest recognition for the first time. The fluorescence sensing platform was constructed by CP5 functionalized Au nanoparticles (PP5@Au-NPs) as receptor and probe (rhodamine 123, R123), which shown a high sensitivity and selectivity to L-carnitine detection. Due to the property of the negative charge and molecular size of L-carnitine, it can be highly captured by the CP5 via electrostatic interactions and hydrophobic interactions. The mechanism of host-guest between PP5 and L-carnitine was studied by 1H NMR and molecular docking, which indicated more affinity binding force of PP5 with L-carnitine. Therefore, a selective and sensitive fluorescent method was developed. It has a linear response of 0.1–2.0 and 2.0–25.0 μM and a detection limit of 0.067 μM (S/N = 3) for L-carnitine. The fluorescent sensing platform was also used to detect L-carnitine in human serum and milk samples, which provided potential applications of detection drugs of abuse, and had path for guarding a serious food safety issues.   

scholarly journals Novel Competitive Fluorescence Sensing Platform for L-carnitine Based on Cationic Pillar[5]Arene Modified Gold Nanoparticles

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3927 ◽  
Author(s):  
Xiaoping Tan ◽  
Yang Yang ◽  
Shasha Luo ◽  
Zhong Zhang ◽  
Wenjie Zeng ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Hydrophobic Interactions ◽  
Molecular Size ◽  
High Sensitivity ◽  
Fluorescence Sensing ◽  
Safety Issues ◽  
Fluorescent Method ◽  
Sensing Platform ◽  
Potential Applications ◽  
Sensitivity And Selectivity

Supramolecular host-guest interaction and sensing between cationic pillar[5]arenes (CP5) and L-carnitine were developed by the competitive host-guest recognition for the first time. The fluorescence sensing platform was constructed by CP5 functionalized Au nanoparticles (CP5@Au-NPs) as receptor and probe (rhodamine 123, R123), which shown high sensitivity and selectivity for L-carnitine detection. Due to the negative charge and molecular size properties of L-carnitine, it can be highly captured by the CP5 via electrostatic interactions and hydrophobic interactions. The host-guest mechanism between PP5 and L-carnitine was studied by 1H NMR and molecular docking, indicating that more affinity binding force of CP5 with L-carnitine. Therefore, a selective and sensitive fluorescent method was developed. It has a linear response of 0.1–2.0 and 2.0–25.0 μM and a detection limit of 0.067 μM (S/N = 3). The fluorescent sensing platform was also used to detect L-carnitine in human serum and milk samples, which provided potential applications for the detection of drugs abuse and had path for guarding a serious food safety issues.

Fluorescence chemosensors for hydrogen sulfide detection in biological systems

The Analyst ◽  
2015 ◽  
Vol 140 (6) ◽  
pp. 1772-1786 ◽  
Author(s):  
Zhi Guo ◽  
Guiqiu Chen ◽  
Guangming Zeng ◽  
Zhongwu Li ◽  
Anwei Chen ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Biological Systems ◽  
Sulfate Reducing Bacteria ◽  
Fluorescence Sensing ◽  
Sulfate Reducing ◽  
Potential Applications ◽  
Reducing Bacteria

The development of H2S fluorescence-sensing strategies and their potential applications in the determination of sulfate-reducing bacteria activity.

Simultaneous determination of Acetaminophen and dopamine based on a water-soluble pillar[6]arene and ultrafine Pd nanoparticle-modified covalent organic framework nanocomposite

The Analyst ◽  
2021 ◽  
Vol 146 (1) ◽  
pp. 262-269
Author(s):  
Xiaoping Tan ◽  
Tong Mu ◽  
Sheng Wang ◽  
Jian Li ◽  
Juan Huang ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Water Soluble ◽  
Electrochemical Sensing ◽  
Pd Nanoparticle ◽  
Covalent Organic Framework ◽  
Sensing Platform ◽  
Organic Framework

A novel electrochemical sensing platform for the simultaneous determination of AP and DA based on a water-soluble pillar[6]arene and ultrafine Pd nanoparticle-modified covalent organic framework nanocomposite.

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