Synthesis and characterization of magnetic-molecularly imprinted polymers for the HPLC-UV analysis of ametryn

Khan, Sabir; Hussain, Sajjad; Wong, Ademar; Foguel, Marcos Vinicius; Gonçalves, Luís Moreira; Pividori, Maria Isabel; Sotomayor, Marı́a Del Pilar Taboada

doi:10.1016/j.reactfunctpolym.2017.11.002

Cited by 70 publications

(20 citation statements)

References 51 publications

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“…Adsorption isotherms models were also employed to study the mechanism of adsorption. Three models, namely, Langmuir isotherms, Freundlich adsorption model [41][42][43], and Temkin isotherm [44] were applied. Mathematically Langmuir isotherms can be expressed as Eq.…”

Section: Adsorption Kinetics Isotherms and Thermodynamic Studymentioning

confidence: 99%

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

et al. 2020

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Adsorption of dibenzothiophene (DBT) from model oil was investigated using composites of pure activated charcoal and pure bentonite clay. DBT adsorption was carried out in batch mode experiments at laboratory scale, where the developed composite materials showed a synergistic effect in removal of DBT from the model oil in terms of improved surface acidity of the pure activated charcoal and mesoporous structure of the pure bentonite clay. Thermodynamics, kinetics, and optimization of various adsorption parameters were investigated. Kinetic analyses proved that DBT adsorption followed pseudo‐second‐order kinetics. To study the thermodynamics of the adsorption, different isotherm adsorption models were applied. The Langmuir isotherm best fitted to the adsorption data. Various thermodynamic parameters were evaluated, including Gibbs free energy, entropy, and enthalpy.

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Section: Adsorption Kinetics Isotherms and Thermodynamic Studymentioning

confidence: 99%

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

et al. 2020

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“…Molecularly imprinted polymers (MIPs) were imagined as a lab-made alternative to biological receptors, imitating antibodies [9], MIPs have tailor-made selective recognition sites for selected molecules [10][11][12]. These biomimetic polymers are obtained by polymerization, a process in which the building monomers are polymerized around a target template (generally, the aimed analyte).…”

Section: /20mentioning

confidence: 99%

“…The overall process of the development of the SPCE-MIP sensor is schematized in Fig. 2 [28,29] and suitable chemical template [11,[30][31][32][33]. In the electrodeposition process, the T 0 AM template molecules are entrapped within the MIP.…”

Section: Sensor Development and Characterizationmentioning

confidence: 99%

Electrochemical sensing of the thyroid hormone thyronamine (T0AM) via molecular imprinted polymers (MIPs)

Pacheco

Rebelo

Cagide

et al. 2019

Talanta

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Recent studies have shown that besides the well-known T 3 (triiodothyronine) and T 4 (thyroxine) there might be other important thyroid hormones, in particular T 0 AM (thyronamine) and T 1 AM (3-iodothyronamine). The absence of a large number of studies showing their precise importance might be explained by the limited number of analytical methodologies available. This work aims to show an electroanalytical alternative making use of electropolymerized molecularly imprinted polymer (MIPs). The MIPs' polymerization is performed on the surface of screen-printed carbon electrodes (SPCEs), using 4-aminobenzoic acid (4-ABA) as the building and functional monomer and the analyte T 0 AM as the template. The step-by-step construction of the SPCE-MIP sensor was studied by cyclic voltammetry (CV) and by electrochemical impedance spectroscopy (EIS). After optimization, by means of square-wave voltammetry, the SPCE-MIP showed suitable selectivity (in comparison with other thyroid hormones and catechol amines), repeatability (intraday of 3.9%), a linear range up to 10 μmol L-1 (0.23 x 10 3 μg dL-1) with an r 2 of 0.998 and a limit of 2/20 detection (LOD) and quantification (LOQ) of 0.081 and 0.27 μmol L-1 (1.9 and 6.2 μg dL-1), respectively.

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“…Molecularly imprinted polymers (MIPs) are tailor‐made recognition materials synthesized by copolymerizing suitable functional monomers in the presence of a template. MIPs have attracted considerable research attention because they can bind the target molecules specifically and provide significantly higher affinity and selectivity, thereby avoiding the co‐elution of interference from impurities . Molecular imprinting techniques are often coupled with SPE, called molecularly imprinted solid‐phase extraction (MISPE), and have attracted increasing attention because of their low cost, storage stability, high mechanical strength, robustness, and resistance to a wide range of pH, solvents, and temperatures .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of levofloxacin and ciprofloxacin in human urine by ionic‐liquid‐based, dual‐template molecularly imprinted coated graphene oxide monolithic solid‐phase extraction

Row

2018

J of Separation Science

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A novel method was developed to simultaneously determine the ciprofloxacin and levofloxacin levels in human urine using an ionic‐liquid‐based, dual‐molecularly imprinted polymer‐coated graphene oxide solid‐phase extraction monolithic column coupled with high‐performance liquid chromatography. The molecularly imprinted monolithic column was prepared using ciprofloxacin and levofloxacin as templates, 1‐vinyl‐3‐ethylimidazolium bromide as the functional monomer, and graphene oxide as the core material. The resulting imprinted monoliths were characterized by scanning electron microscopy and fourier transform‐infrared spectroscopy. The efficiency and capacity of the ionic‐liquid‐based imprinted monolithic column were investigated by varying the synthesis conditions (ciprofloxacin/levofloxacin ratio and template/functional monomer/cross‐linker ratio). The solid‐phase extraction process was optimized by changing the washing and eluting conditions. The results suggested that the proposed ionic‐liquid‐based molecularly imprinted solid‐phase extraction monolithic‐high‐performance liquid chromatography method could separate ciprofloxacin and levofloxacin efficiently and simultaneously from human urine. The mean recoveries of ciprofloxacin and levofloxacin ranged from 89.2 to 93.8 and 86.7 to 94.6%, respectively. The intra‐ and interday relative standard deviation ranged from 0.9 to 3.2 and 0.8 to 2.9%, respectively. Under the optimized conditions, the recoveries of ciprofloxacin and levofloxacin were more than 93.8%.

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Synthesis and characterization of magnetic-molecularly imprinted polymers for the HPLC-UV analysis of ametryn

Cited by 70 publications

References 51 publications

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

Electrochemical sensing of the thyroid hormone thyronamine (T0AM) via molecular imprinted polymers (MIPs)

Simultaneous determination of levofloxacin and ciprofloxacin in human urine by ionic‐liquid‐based, dual‐template molecularly imprinted coated graphene oxide monolithic solid‐phase extraction

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