Selective extraction of perfluorooctane sulfonate in real samples by superparamagnetic nanospheres coated with a polydopamine‐based molecularly imprinted polymer

2020 ◽  
Author(s):  
Like Lin ◽  
Huiqin Guo ◽  
Sen Lin ◽  
Yanfei Chen ◽  
Liushui Yan ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Perfluorooctane Sulfonate ◽  
Selective Extraction ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Real Samples

scholarly journals A Molecularly Imprinted Polymer for Selective Extraction of Phenolic Acids from Human Urine

2021 ◽  
Vol 11 (4) ◽  
pp. 1577
Author(s):  
Marco Mora-Granados ◽  
David González-Gómez ◽  
Jin Su Jeong ◽  
Alejandrina Gallego-Picó
Keyword(s):  
Phenolic Acids ◽  
Molecularly Imprinted Polymer ◽  
Human Urine ◽  
Limit Of Detection ◽  
Ph Dependence ◽  
Selective Extraction ◽  
Screening Methods ◽  
Specific Method ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

Studies for monitoring the bioavailability of dietary flavonoid compounds generate great interest. Among them, low-molecular-weight phenolic acids, secondary metabolites present in colonic catabolism and urinary excretion, have been proposed as biomarkers of polyphenol intake. Using 4-hydroxyphenylacetic acid as a template, a molecularly imprinted polymer (MIP) was synthesized for selective extraction of these hydroxylated metabolites from human urine samples and posterior analysis in an HPLC-DAD-MS system. Polymers were characterized by Scanning electron microscopy (SEM), Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), Brunauer-Emmett-Teller (BET) method, and binding experiments. MIP presents specific recognition ability for template and analogues molecules. This capacity of recognition and the pH dependence of the binding strength was also studied. The method was validated over a concentration range of 0.25–40 mg/L, r2 > 0.995. In the optimized conditions, the recovery value was 94% with RSD 1.2%. The Limit of Detection (LOD) and Limit of Quantification (LOQ) were 1.22 and 3.69 mg/L, respectively. In our knowledge, it is the first time that this methodology is applied to analyze urinary catabolites of the polyphenol compound and to provide a specific method and simple analysis alternative. The selective extraction of these metabolites improves the application and results obtained by other less sensitive analysis methods than the validation method. It also facilitates the development of new screening methods.

Selective extraction of progesterone hormones from environmental and biological samples using a polypyrrole molecularly imprinted polymer and determination by gas chromatography

2016 ◽  
Vol 8 (8) ◽  
pp. 1813-1827 ◽  
Author(s):  
A. Nezhadali ◽  
Z. Es’haghi ◽  
A. Khatibi
Keyword(s):  
Gas Chromatography ◽  
Molecularly Imprinted Polymer ◽  
Biological Samples ◽  
Selective Extraction ◽  
Chemical Oxidation ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Batch Extraction ◽  
Environmental And Biological Samples

A Molecularly Imprinted Polymer (MIP) was chemically prepared for the selective batch extraction of progesterone (PGN) hormones by chemical oxidation of pyrrole using FeCl3.

Molecularly Imprinted Polymer for Selective Extraction of Tartaric Acid

2018 ◽  
Vol 73 (9) ◽  
pp. 855-861 ◽  
Author(s):  
Z. Ghasempour ◽  
M. Alizadeh-Khaledabad ◽  
M. R. Vardast ◽  
M. Rezazad-Bari
Keyword(s):  
Tartaric Acid ◽  
Molecularly Imprinted Polymer ◽  
Selective Extraction ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

scholarly journals Application of molecularly imprinted polymer designed for the selective extraction of ketoprofen from wastewater

Water SA ◽  
2018 ◽  
Vol 44 (3 July) ◽  
Author(s):  
Lawrence Mzukisi Madikizela ◽  
Silindile Senamile Zunngu ◽  
Nomchenge Yamkelani Mlunguza ◽  
Nikita Tawanda Tavengwa ◽  
Phumlane Selby Mdluli ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Selective Extraction ◽  
Bulk Polymerization ◽  
Selectivity Coefficient ◽  
Dynamics Simulation ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Functional Monomer ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

A molecularly imprinted polymer (MIP) that is selective to ketoprofen was synthesized and applied in the adsorption of the target compound from water. The MIP was synthesized using a bulk polymerization method at high temperatures (60–80°C), where ketoprofen, 2-vinylpyridine, ethylene glycol dimethacrylate, toluene and 1,1´-azobis(cyclohexanecarbonitrile) were used as template, functional monomer, cross-linker, porogen and initiator, respectively. Non-imprinted polymer (NIP) was synthesized similarly to the MIP but in the absence of ketoprofen. From molecular dynamics simulation, the nature of interactions that occurred between the template and the functional monomer were found to be based on hydrogen bonding. This was confirmed experimentally, where a high extraction efficiency of ≥ 90% was obtained at acidic conditions (pH 5) due to the protonation of ketoprofen. A contact time of 45 min was sufficient for the maximum adsorption of ketoprofen from 10 mL spiked water using 8 mg of the adsorbent. MIP showed greater selectivity than NIP by achieving a relative selectivity coefficient of 7.7 towards ketoprofen in the presence of structurally related pharmaceuticals. Furthermore, the order of sorption onto the MIPs from water was ketoprofen > fenoprofen > gemfibrozil. From a modelling perspective, the Langmuir adsorption isotherm and pseudo-second-order kinetic model gave the best fit, with maximum adsorption capacity of 8.24 mg·g−1 and sorption rate constant of 0.25 mg·g−1·min−1 for MIP. This was translated to chemisorption of ketoprofen onto the homogeneous MIP binding sites. This work demonstrated the great potential of MIP in selective recognition of ketoprofen from wastewater relative to closely related compounds.

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