scholarly journals Microwave Enhanced Synthesis of Chitosan-graftMolecularly Imprinted Polymer (MIP) for Selective Extraction of Antioxidants

2010 ◽  
Vol 7 (4) ◽  
pp. 1362-1374 ◽  
Author(s):  
N. Saifuddin ◽  
A. A. Nur Yasumira
Keyword(s):  
Adsorption Capacity ◽  
Selective Extraction ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Chitosan Beads ◽  
Molecularly Imprinted ◽  
Adsorption Models ◽  
Adsorption Capacities ◽  
Enhanced Adsorption ◽  
Functional Matrix

Polymers have been molecularly imprinted for the purpose of binding specifically toα-tocotrienol (vitamin E). A molecularly imprinted polymer (MIP) material was prepared usingα-tocotrienol as the imprinted molecule, acrylamide as functional monomer and macroporous chitosan beads as functional matrix. Chitosan-graft-polyacrylamide was synthesized without any radical initiator or catalyst using microwave (MW) irradiation. The representative microwave synthesized graft copolymer was characterized by fourier transform-infrared spectroscopy, taking chitosan as a reference. Microwave irradiation was exploited for polyacrylamide grafting on the cross-linked chitosan beads to produce MIP, where both time as well as chemicals can be saved. It can be assumed that the chitosan coated polyacrylamide MIP will have better pH stability and enhanced adsorption capacity. The maximum adsorption capacity was observed to be 3.95 mg/g of MIP, which gave removal efficiency of 93%. After 4 h, the change of adsorption capacities forα-tocotrienol did not show notable effects. The Langmuir and Freundlich adsorption models were also applied to describe the equilibrium isotherms.

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.

Preparation and Recognition Performance of Chloramphenicol Molecularly Imprinted Polymer

2013 ◽  
Vol 448-453 ◽  
pp. 192-196 ◽  
Author(s):  
Hai Xia Shen ◽  
Quan De Liu ◽  
Jie Qin ◽  
Shi Rong Tang
Keyword(s):  
Adsorption Capacity ◽  
Molecularly Imprinted Polymer ◽  
Selective Adsorption ◽  
Recognition Performance ◽  
Kinetic Curve ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Kinetics Of ◽  
Adsorption Quantity

A new molecularly imprinted polymer, which can be used for selective adsorption of chloramphenicol (CAP) from aqueous solutions, was successfully prepared by precipitation polymerization. The adsorption kinetic curve, adsorption isotherm and selective adsorption were measured by static method. The adsorption kinetics of MIPs for CAP reached the equilibrium at about 11 hours. The maximum adsorption capacity was 43.395 mmol/g, and the MIP has much higher adsorption quantity than NIP. Competitive adsorption studies showed that MIP offers the advantages of selectivity toward CAP compared with NIP in the presence other antibiotics. The results showed that the MIP possessed good specific adsorption capacity and selectivity for CAP.

Selective Adsorption and Pre-Concentration of Morin by Molecularly Imprinted Polymers with Chitosan Beads as Functional Matrix

2013 ◽  
Vol 781-784 ◽  
pp. 756-759
Author(s):  
Hai Hui Zhang ◽  
Fei Fei Xu ◽  
Yu Qing Duan ◽  
Can Zhang ◽  
Yong Sheng Yan ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymers ◽  
Solid Phase ◽  
Selective Adsorption ◽  
Imprinted Polymer ◽  
Chitosan Beads ◽  
Molecularly Imprinted ◽  
Ft Ir ◽  
Surface Molecular Imprinting Technique ◽  
Elution Step ◽  
Functional Matrix

To separate and enrich morin, a molecularly imprinted polymer (MIP) was synthesized on chitosan by surface molecular imprinting technique and characterized with Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The results showed that MIP possessed better selectivity and recognition for morin in a mixture than that of non-imprinted polymer (NIP). The saturated adsorption amount of MIP was 8.0 mg/g, which was 4-fold than that of NIP, and the recovery in the elution step was 94.87% and 10.97% for MIP and NIP, respectively. These findings indicate MIP could realize the separation and pre-concentration of morin in real sample and may be used for solid phase extraction (MIP-SPE) protocol.

Magnetic mesoporous imprinted adsorbent based on Fe3O4-modified sepiolite for organic micropollutant removal from aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 27034-27042 ◽  
Author(s):  
Haicheng Liu ◽  
Wei Chen
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Molecularly Imprinted Polymer ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Magnetic Molecularly Imprinted Polymer ◽  
Micropollutant Removal ◽  
Polymer Adsorbent ◽  
First Time

A novel magnetic molecularly imprinted polymer adsorbent based on a magnetic sepiolite composite was successfully prepared for the first time. It has a maximum adsorption capacity of 69.53 mg g−1for atrazine.

scholarly journals The Physiochemical Properties and Adsorption Characteristics of Processed Pomelo Peel as a Carrier for Epigallocatechin-3-Gallate

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4249
Author(s):  
Liangyu Wu ◽  
Guoying Zhang ◽  
Jinke Lin
Keyword(s):  
Adsorption Capacity ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Isothermal Adsorption ◽  
Physiochemical Properties ◽  
Pomelo Peel ◽  
Adsorption Capacities ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Enhanced Adsorption

The NaOH-HCl- and ethanol-pretreated pomelo peel samples were prepared to apply to the batch adsorption for epigallocatechin-3-gallate (EGCG). The characteristics of peel samples were determined by Fourier transform infrared spectroscopy, scanning electron microscopy and a laser particle analyzer. The results of the physiochemical properties of the peel samples demonstrate that these peel samples have a promising adsorption capacity for EGCG, because of the increased potential binding sites on the surface compared with those of untreated peel samples. These two peel samples showed enhanced adsorption capacities of EGCG compared with that of unmodified peel in terms of the isothermal adsorption process, which could be described by both Langmuir and Freundlich models, with the theoretical maximum adsorption capacity of 77.52 and 94.34 mg g−1 for the NaOH-HCl and ethanol-treated peel samples, respectively. The adsorption kinetics demonstrated an excellent fitness to pseudo-second-order, showing that chemisorption was the rate-limiting step. The thermodynamics analysis revealed that the adsorption reaction was a spontaneous and endothermic process. This work highlights that the processed pomelo peels have outstanding adsorption capacities for EGCG, which could be promising candidates for EGCG delivering in functional food application.

Synthesis, characterization, and theoretical study of an acrylamide-based magnetic molecularly imprinted polymer for the recognition of sulfonamide drugs

e-Polymers ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 141-150 ◽  
Author(s):  
Lei Chen ◽  
Yean Kee Lee ◽  
Yanawut Manmana ◽  
Kheng Soo Tay ◽  
Vannajan Sanghiran Lee ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Molecularly Imprinted Polymer ◽  
Density Functional ◽  
Computational Study ◽  
Maximum Adsorption Capacity ◽  
Binding Property ◽  
Imprinted Polymer ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Molecularly Imprinted ◽  
Magnetic Molecularly Imprinted Polymer

AbstractIn this work, a magnetic molecularly imprinted polymer (MION-MIP) was prepared for the recognition and extraction of sulfadiazine (SDZ). The acrylamide-based MIP was imprinted directly onto the surface of 3-(trimethoxysilyl)propyl methacrylate-modified magnetic iron oxide nanoparticles. The synthesized MION-MIP with a diameter about 100 nm possesses fast adsorption kinetics and high adsorption capacity. The results also indicated that a higher maximum adsorption capacity (775 μg g-1) was achieved by the synthesized MION-MIP. The Langmuir adsorption isotherm model was found to describe well the equilibrium adsorption data. The results from the competitive binding experiment showed that MION-MIP was not only selective toward SDZ but the adsorption of sulfamerazine was also dramatically high. SDZ and sulfamerazine have an almost similar substructure where these two compounds were only differentiated by one methyl group. To explain this result, a computational study was carried out. From a different level of calculation with semiempirical (PM3), Hartree-Fock (HF), and density functional theory (DFT) calculation, SDZ and sulfamerazine showed similar interaction energy and interaction mechanism with the acrylamide monomer. Therefore, both SDZ and sulfamerazine could have the same binding property with the MION-MIP.

Simultaneous selective extraction of nitramine explosives using molecularly imprinted polymer hollow spheres from post blast samples

2017 ◽  
Vol 41 (3) ◽  
pp. 1129-1136 ◽  
Author(s):  
Jian Wang ◽  
Zihui Meng ◽  
Min Xue ◽  
Lili Qiu ◽  
Xiao Dong ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Molecularly Imprinted Polymer ◽  
Hollow Spheres ◽  
Selective Extraction ◽  
Imprinted Polymer ◽  
Adsorption Selectivity ◽  
Molecularly Imprinted

Solvents modulate the adsorption selectivity and adsorption capacity of a molecularly imprinted polymer to target compounds.

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.

scholarly journals Enhanced Adsorption of Bisphenol A from Aqueous Solution with 2-Vinylpyridine Functionalized Magnetic Nanoparticles

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1136 ◽  
Author(s):  
Qiang Li ◽  
Fei Pan ◽  
Wentao Li ◽  
Dongya Li ◽  
Haiming Xu ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Magnetic Nanoparticle ◽  
Maximum Adsorption Capacity ◽  
Salting Out ◽  
Functionalized Magnetic Nanoparticles ◽  
Ft Ir ◽  
Fe3o4 Nanospheres ◽  
Enhanced Adsorption

In this study, a novel 2-vinylpyridine functionalized magnetic nanoparticle (Mag-PVP) was successfully prepared. The prepared Mag-PVP was characterized by transmission electronic microscopy (TEM), Fourier transform infrared spectrophotometry (FT-IR), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA), and was used for the adsorption of bisphenol A (BPA) from aqueous solutions. Mag-PVP, which is composed of Fe3O4 nanoparticles and poly divinylbenzene-2-vinylpyridine (with a thickness of 10 nm), exhibited magnetic properties (Ms = 44.6 emu/g) and thermal stability. The maximum adsorption capacity (Qm) of Mag-PVP for BPA obtained from the Langmuir isotherm was 115.87 mg/g at 20 °C, which was more than that of Fe3O4 nanospheres. In the presence of NaCl, the improved adsorption capacity of Mag-PVP was probably attributed to the screening effect of Mag-PVP surface charge and salting-out effect. In the presence of CaCl2 and humic acid (HA), the adsorption capacity of BPA decreased due to competitive adsorption. The adsorption of BPA by Mag-PVP increased slightly with the increase in pH from 3.0 to 5.0 and obtained the largest adsorption amount at pH 5.0, which was probably attributed to hydrogen bonding interactions. Moreover, in actual water, Mag-PVP still showed excellent adsorption performance in removing BPA. The high adsorption capacity and excellent reusability performance in this work indicated that Mag-PVP was an effective adsorbent for removing BPA from aqueous solutions.

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