scholarly journals CdTe0.5S0.5/ZnS Quantum Dots Embedded in a Molecularly Imprinted Polymer for the Selective Optosensing of Dopamine

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 693 ◽  
Author(s):  
Kiana Khadem-Abbassi ◽  
Hervé Rinnert ◽  
Lavinia Balan ◽  
Zahra Doumandji ◽  
Olivier Joubert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Molecularly Imprinted Polymer ◽  
Limit Of Detection ◽  
Low Cost ◽  
Core Shell ◽  
Selective Detection ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Cross Linker

This work describes the preparation of molecularly imprinted polymer (MIP)-modified core/shell CdTe0.5S0.5/ZnS quantum dots (QDs). The QDs@MIP particles were used for the selective and sensitive detection of dopamine (DA). Acrylamide, which is able to form hydrogen bonds with DA, and ethylene glycol dimethylacrylate (EGDMA) as cross-linker were used for the preparation of the MIP. Highly cross-linked polymer particles with sizes up to 1 µm containing the dots were obtained after the polymerization. After the removal of the DA template, MIP-modified QDs (QDs@MIP) exhibit a high photoluminescence (PL) with an intensity similar to that of QDs embedded in the nonimprinted polymer (NIP). A linear PL decrease was observed upon addition of DA to QDs@MIP and the PL response was in the linear ranges from 2.63 µM to 26.30 µM with a limit of detection of 6.6 nM. The PL intensity of QDs@MIP was quenched selectively by DA. The QDs@MIP particles developed in this work are easily prepared and of low cost and are therefore of high interest for the sensitive and selective detection of DA in biological samples.

A core–shell CdTe quantum dots molecularly imprinted polymer for recognizing and detecting p-nitrophenol based on computer simulation

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 73424-73433 ◽  
Author(s):  
Yingchun Wang ◽  
Ningwei Wang ◽  
Xiaoni Ni ◽  
Qianqian Jiang ◽  
Wenming Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Computer Simulation ◽  
Molecular Imprinting ◽  
Molecularly Imprinted Polymer ◽  
Cdte Quantum Dots ◽  
Core Shell ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Molecular Imprinting Technology

A novel molecular imprinting technology, combined with computer simulation and QDs, was used to detect 4-NP.

scholarly journals Laser-Induced Graphene Electrodes Modified with a Molecularly Imprinted Polymer for Detection of Tetracycline in Milk and Meat

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 269
Author(s):  
Biresaw D. Abera ◽  
Inmaculada Ortiz-Gómez ◽  
Bajramshahe Shkodra ◽  
Francisco J. Romero ◽  
Giuseppe Cantarella ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Limit Of Detection ◽  
Low Cost ◽  
Electrochemical Techniques ◽  
Differential Pulse ◽  
Animal Origin ◽  
Label Free ◽  
Imprinted Polymer ◽  
Meat Extract ◽  
Molecularly Imprinted

Tetracycline (TC) is a widely known antibiotic used worldwide to ‘’treat animals. Its residues in animal-origin foods cause adverse health effects to consumers. Low-cost and real-time measuring systems of TC in food samples are, therefore, extremely needed. In this work, a three-electrode sensitive and label-free sensor was developed to detect TC residues from milk and meat extract samples, using CO2 laser-induced graphene (LIG) electrodes modified with gold nanoparticles (AuNPs) and a molecularly imprinted polymer (MIP) used as a synthetic biorecognition element. LIG was patterned on a polyimide (PI) substrate, reaching a minimum sheet resistance (Rsh) of 17.27 ± 1.04 Ω/sq. The o-phenylenediamine (oPD) monomer and TC template were electropolymerized on the surface of the LIG working electrode to form the MIP. Surface morphology and electrochemical techniques were used to characterize the formation of LIG and to confirm each modification step. The sensitivity of the sensor was evaluated by differential pulse voltammetry (DPV), leading to a limit of detection (LOD) of 0.32 nM, 0.85 nM, and 0.80 nM in buffer, milk, and meat extract samples, respectively, with a working range of 5 nM to 500 nM and a linear response range between 10 nM to 300 nM. The sensor showed good LOD (0.32 nM), reproducibility, and stability, and it can be used as an alternative system to detect TC from animal-origin food products.

scholarly journals Protein Determination with Molecularly Imprinted Polymer Recognition Combined with Birefringence Liquid Crystal Detection

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4692 ◽  
Author(s):  
Maciej Cieplak ◽  
Rafał Węgłowski ◽  
Zofia Iskierko ◽  
Dorota Węgłowska ◽  
Piyush S. Sharma ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Molecularly Imprinted Polymer ◽  
Limit Of Detection ◽  
Low Cost ◽  
High Sensitivity ◽  
Imprinted Polymer ◽  
Optical Cell ◽  
Protein Determination ◽  
Molecularly Imprinted ◽  
Nonspecific Interactions

Liquid crystal-based sensors offer the advantage of high sensitivity at a low cost. However, they often lack selectivity altogether or require costly and unstable biomaterials to impart this selectivity. To incur this selectivity, we herein integrated a molecularly imprinted polymer (MIP) film recognition unit with a liquid crystal (LC) in an optical cell transducer. We tested the resulting chemosensor for protein determination. We examined two different LCs, each with a different optical birefringence. That way, we revealed the influence of that parameter on the sensitivity of the (human serum albumin)-templated (MIP-HSA) LC chemosensor. The response of this chemosensor with the (MIP-HSA)-recognizing film was linear from 2.2 to 15.2 µM HSA, with a limit of detection of 2.2 µM. These values are sufficient to use the devised chemosensor for HSA determination in biological samples. Importantly, the imprinting factor (IF) of this chemosensor was appreciable, reaching IF = 3.7. This IF value indicated the predominant binding of the HSA through specific rather than nonspecific interactions with the MIP.

scholarly journals SYNTHESIS NEW LIQUID ELECTRODES FOR DETERMINATION DOMPERIDONE MALEATE BASED ON A MOLECULARLY IMPRINTED POLYMER

2020 ◽  
Vol 12 (2) ◽  
pp. 93-105
Author(s):  
زهراء مهدي1 ◽  
◽  
يحيى كمال البياتي2 ◽  
Keyword(s):  
Ethylene Glycol ◽  
Response Time ◽  
Molecularly Imprinted Polymer ◽  
Limit Of Detection ◽  
Glycol Dimethacrylate ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Pharmaceutical Sample ◽  
Standard Solution ◽  
Liquid Electrodes

Liquid electrodes of domperidone maleate (DOMP) imprinted polymer were synthesis based on precipitation polymerization mechanism. The molecularly imprinted (MIP) and non-imprinted (NIP) polymers were synthesized using DOMP as a template. By methyl methacrylate (MMA) as monomer, N,Nmethylenebisacrylamide (NMAA) and ethylene glycol dimethacrylate (EGDMA) as cross-linkers and benzoyl peroxide (BP) as an initiator. The molecularly imprinted membranes were synthesis using acetophenone (APH), di-butyl sabacate (DBS), Di octylphthalate (DOPH) and triolyl phosphate (TP)as plasticizers in PVC matrix. The slopes and limit of detection of liquid electrodes obtained from the calibration curves ranged from (-18.88– -29.01) mV/decade and (4.0 × 10-5 – 6.0 × 10-5) M, respectively and the response time was about 60 seconds. The Liquid electrodes were filled with (10-2 M) standard solution of the drug and observed stable response for a pH ranged from 2.0 to 11.0 and with good selectivity for over several species. The fresh electrodes of synthesis were effectively used in the pharmaceutical sample to determine DOMP without any time consuming pretreatment measures.

Construction and Studies of Histamine Potentiometric Sensors Based on Molecularly Imprinted Polymer

2020 ◽  
Vol 16 (6) ◽  
pp. 788-794 ◽  
Author(s):  
Atsuko Konishi ◽  
Shigehiko Takegami ◽  
Tatsuya Kitade
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Limit Of Detection ◽  
Reference Electrode ◽  
Potentiometric Sensors ◽  
Template Molecule ◽  
Uv Spectrophotometry ◽  
Imprinted Polymer ◽  
Potential Response ◽  
Molecularly Imprinted ◽  
Cross Linker

Objective: Molecularly Imprinted Polymer (MIP)-modified potentiometric sensors for histamine (HIS) (as denoted as HIS sensor) have been developed. Methods: The MIPs comprise HIS, Methacrylic Acid (MAA) and ethylene glycol dimethacrylate as the template molecule, functional monomer and cross-linker, respectively. To examine the specificity of the MIP to HIS, the MIP particles were prepared with varying ratios of HIS: MAA and the HIS binding amount toward the MIP particles was determined by UV spectrophotometry. Furthermore, to quantitatively determine the ability of MIP (H2M20) to HIS, a HIS sensor was measured using Ag/AgCl as a reference electrode. Results: MIP particles having a HIS:MAA of 2 mmol:20 mmol (MIP (H2M20)) had the largest HIS binding amount among the MIP particles prepared. Additionally, MIP (H2M20) displayed a HIS binding amount approximately two times larger than the corresponding non-imprinted polymer (NIP) particles in the absence of template. The HIS sensor potential change increased as a function of HIS concentration and exhibited a near-Nernstian response of −25.7 mV decade−1 over the HIS concentration range of 1×10−5 to 1×10−4 mol L−1 with a limit of detection of 9.6×10−6 mol L−1. From the Nernstian response value, it was observed that the HIS sensor could detect the di-protonated HIS binding to the MIP. Conversely, when comparing at the same HIS concentration, the potential response value of the sensors fabricated using NIP particles were significantly smaller than the values of the corresponding HIS sensor. Conclusion: The MIP-modified potentiometric sensors can potentially be employed as an analytical method to quantitatively determine various analytes.

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