Development of Melamine Electrochemical Sensor Using Molecularly Imprinted Conducting Polyanilne-Oxalic Acid Blend as a Molecular Recognition Element

2020 ◽  
Vol 29 ◽  
pp. 61-73
Author(s):  
Melkamu Biyana Regasa ◽  
Olu Emmanuel Femi ◽  
Tesfaye Refera Soreta ◽  
Praveen C. Ramamarthy ◽  
Saravanan Kumaran
Keyword(s):  
Molecular Recognition ◽  
Oxalic Acid ◽  
Electrochemical Polymerization ◽  
Differential Pulse ◽  
Molar Ratio ◽  
Imprinted Polymer ◽  
Formula Milk ◽  
Molecularly Imprinted ◽  
Practical Applications ◽  
Recognition Element

In the present work, oxalic acid doped molecularly imprinted conducting polyaniline film for melamine detection was prepared by in-situ-electrochemical polymerization on the glassy carbon electrode (GCE) using melamine as template. The optimal monomer/template molar ratio was attained to be 0.2:0.1:0.01 (aniline: oxalic acid: melamine) and molecular recognition properties towards melamine were evaluated by differential pulse voltammetry. Under optimal conditions the imprinted polymer film was used to detect different concentrations of melamine in standard solutions and real milk samples. Compared with the nonimprinted polymer (NIP), the molecularly imprinted polymer (MIP) film showed higher affinity and sensitivity towards melamine with a linear range, quantification limit and detection limit of 0.5-200 nM, 1.375 nM and 0.413 nM respectively. Furthermore, the polymer blend film showed good selectivity toward melamine, stability, reproducibility and practical applications for the determination of melamine in infant formula milk with the recovery of 92.32-102.49%. The doping of the polymer with oxalic acid enhanced the conductivity and sensitivity of the sensor.

A Sensitive and Selective Electrochemical Sensor for Sulfadimethoxine Based on Electropolymerized Molecularly Imprinted Poly (o-aminophenol) Film

2020 ◽  
Vol 16 (4) ◽  
pp. 413-420 ◽  
Author(s):  
Youyuan Peng ◽  
Qiaolan Ji
Keyword(s):  
Electrochemical Sensor ◽  
Polymer Film ◽  
Water Samples ◽  
Differential Pulse ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Long Term Stability ◽  
Multi Walled Carbon Nanotubes ◽  
Aquaculture Water ◽  
Walled Carbon Nanotubes

Background: As a broad-spectrum antibiotic of the sulfonamide family, Sulfadimethoxine (SDM) has been widely utilized for therapeutic and growth-promoting purposes in animals. However, the use of SDM can cause residual problems. Even a low concentration of SDM in the aquatic system can exert toxic effects on target organisms and green algae. Therefore, the quantitation of SDM residues has become an important task. Methods: The present work describes the development of a sensitive and selective electrochemical sensor for sulfadimethoxine based on molecularly imprinted poly(o-aminophenol) film. The molecular imprinted polymer film was fabricated by electropolymerizing o-aminophenol in the presence of SDM after depositing carboxylfunctionalized multi-walled carbon nanotubes onto a glassy carbon electrode surface. SDM can be quickly removed by electrochemical methods. The imprinted polymer film was characterized by cyclic voltammetry, differential pulse voltammetry and scanning electron microscopy. Results: Under the selected optimal conditions, the molecularly imprinted sensor shows a linear range from 1.0 × 10-7 to 2.0 × 10-5 mol L-1 for SDM, with a detection limit of 4.0 × 10-8 mol L-1. The sensor was applied to the determination of SDM in aquaculture water samples successfully, with the recoveries ranging from 95% to 106%. Conclusion: The proposed sensor exhibited a high degree of selectivity for SDM in comparison to other structurally similar molecules, along with long-term stability, good reproducibility and excellent regeneration capacity. The sensor may offer a feasible strategy for the analysis of SDM in aquaculture water samples.

Monolithic molecularly imprinted polymer for sulfamethoxazole and molecular recognition properties in aqueous mobile phase

2006 ◽  
Vol 571 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Xiangjun Liu ◽  
Canbin Ouyang ◽  
Rui Zhao ◽  
Dihua Shangguan ◽  
Yi Chen ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Molecularly Imprinted Polymer ◽  
Mobile Phase ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

Preparation of molecularly imprinted polymer for sinomenine and study on its molecular recognition mechanism

Polymer ◽  
2006 ◽  
Vol 47 (11) ◽  
pp. 3792-3798 ◽  
Author(s):  
Li-Qin Lin ◽  
Ying-Chun Li ◽  
Qiang Fu ◽  
Lang-Chong He ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Molecularly Imprinted Polymer ◽  
Imprinted Polymer ◽  
Recognition Mechanism ◽  
Molecularly Imprinted

Electrochemical Detection of Fenthion Insecticide in Olive Oils by a Sensitive Non-Enzymatic Biomimetic Sensor Enhanced with Metal Nanoparticles

2021 ◽  
Vol 5 (1) ◽  
pp. 64
Author(s):  
Youssra Aghoutane ◽  
Nezha El Bari ◽  
Zoubida Laghrari ◽  
Benachir Bouchikhi
Keyword(s):  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Organophosphate Insecticide ◽  
Imprinted Polymer ◽  
High Recovery ◽  
Molecularly Imprinted ◽  
Olive Oils ◽  
Pulse Voltammetry ◽  
Biomimetic Sensor

Fenthion, an organophosphate insecticide, is a cholinesterase inhibitor and is highly toxic. An electrochemical sensor based on molecularly imprinted polymer is developed here for its detection. For this purpose, 2-aminothiophenol mixed with gold nanoparticles was immobilized on screen-printed gold electrodes. The FEN pattern was then fixed before being covered with 2-aminothiophenol. Cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy methods were used for the electrochemical characterization. The low detection limit was 0.05 mg/Kg over a range of 0.01–17.3 µg/mL. The sensor was successfully applied for the determination of FEN in olive oil samples with high recovery values.

Valorization of Red Onion Peels for Quercetin Recovery Using Quercetin-Imprinted Polymer

2019 ◽  
Vol 58 (2) ◽  
pp. 163-170
Author(s):  
Şeyda Karaman Ersoy ◽  
Esma Tütem ◽  
Kevser Sözgen Başkan ◽  
Reşat Apak
Keyword(s):  
Solid Phase ◽  
Agricultural Waste ◽  
Nutritional Supplement ◽  
Bulk Polymerization ◽  
Molar Ratio ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Onion Peel ◽  
Hydrolysis Process ◽  
Valuable Product

Abstract Quercetin (QC) is one of the most prominent dietary antioxidants present in vegetables/fruits, specifically in onions that rank second in consumption following tomato. QC with proven health benefits is now largely utilized as a nutritional supplement. In this work that aims to isolate QC from red onion peels forming a huge agricultural waste, a QC-molecularly imprinted polymer (QC-MIP) in a molar ratio of 1:4:20 (QC:4-vinylpyridine:ethylene glycol dimethacrylate) was prepared thermally through bulk polymerization. Molecularly imprinted solid phase extraction (MISPE) procedures were applied for the selective pre-concentration and purification of QC from both red onion peel methanolic extract with 58% recovery and from the extract hydrolyzate with 86% recovery. The hydrolysis process increased both the QC amount as expected and the recovery yield due to changing matrix components. The results demonstrated that onion peel can easily and efficiently be converted to a valuable product, QC, using QC-MIP as SPE sorbent.

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