A sensitive, fast and low-cost molecular imprinted polymeric sensor for quantitative determination of parathion was prepared with chitosan（CS） as function matrix and parathion（PT） as template molecule via constant...A sensitive, fast and low-cost molecular imprinted polymeric sensor for quantitative determination of parathion was prepared with chitosan（CS） as function matrix and parathion（PT） as template molecule via constant potential electrochemical deposition. Sensitive response was obtained with a detection limit of 1.0× 10-7 mol/L and an excellent recognition for PT was achieved due to the good memory capacity of the sensor. The developed sensor exhibited good fabrication reproducibility and acceptable stability, which provided a new promising tool for pesticide analysis.展开更多
Methacrylic acid with isoproturon has been utilized to prepare molecularly imprinted polymeric (MIP) membrane on Whatman filter paper no. 5 for selective electrochemical estimation of isoproturon pesticide. MIP membra...Methacrylic acid with isoproturon has been utilized to prepare molecularly imprinted polymeric (MIP) membrane on Whatman filter paper no. 5 for selective electrochemical estimation of isoproturon pesticide. MIP membrane was prepared by radical polymerization and characterized using Ultra Violet spectrophotometer, Fourier Transform Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Contact angle study was used to determine the surface energy of the MIP membrane and electrical conductivity measurements were performed by applying a small-amplitude alternating voltage (20 mV) with frequencies varying from 20 Hz to 80 kHz generated by a low-frequency wave form generator. Different isoproturon concentrations in samples were tested and analyzed. Results indicate linear increase in membrane resistance with increasing isoproturon in 10-3 to 10-6 M range. The selectivity of the electrochemical sensor was confirmed by testing isoproturon in presence of the structurally related compounds monouran and diuran. Results reveal highly selective and sensitive sensor, which can be employed for regular estimation of isoproturon in fields.展开更多
The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tert...The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tertbutylcalix[4] arene with self-assembled monolayer character was the sensitive coating of the sensors. The sensors had a special response to organophosphorus compounds and the response frequency shift of this sensor to organophosphorus compounds in 0.1 mg/m3 was 350 Hz. The response frequency increased linearly with the increase of the concentration of DMMP in the range from 0.1 to 0.6 mg/m3. The possible explanation of the interaction between the coatings and organophosphorus compounds was discussed.展开更多
Amaranth imprinted nanoparticless were prepared by two-phase mini emulsion polymerization of hydroxyethyl methacrylate and ethylene glycol dimethacrylate using acrylamide and methacrylic acid as functional monomers.Th...Amaranth imprinted nanoparticless were prepared by two-phase mini emulsion polymerization of hydroxyethyl methacrylate and ethylene glycol dimethacrylate using acrylamide and methacrylic acid as functional monomers.The amaranth non-imprinted nanoparticle was prepared with the same procedure without using amaranth.Amaranth imprinted and non-imprinted nanoparticles were attached on the chip surface modified with allyl mercaptan.The surfaces of the surface plasmon resonance(SPR)sensor were characterized by the ellipsometry,contact angle,and atomic force microscopy.Amaranth solutions with different concentrations(0.1 mg/mL-150mg/mL)were prepared with the pH 7.4 phosphate buffer.The limit of detection and limit of quantification were 0.0180mg/mL and 0.06mg/mL,respectively.When the selectivity of the amaranth imprinted SPR sensor was compared with the competing molecules tartrazine and allura red,it was observed that the target molecule amaranth was 5.64 times and 5.18 times more selective than allura red and tartrazine,respectively.The liquid chromatography-mass spectrometry technique(LC-MS)was used for validation studies.According to the results obtained from both SPR sensor and LC-MS analyses,the amaranth recovery(%)from fruit juices was observed between 96%and 99%.展开更多
By exchanging the conventional role of functional monomer and template molecules,we develop a new molecu-larly imprinted nanospheres with grape grain structures based on multi-hydrogen bonding interactions between mel...By exchanging the conventional role of functional monomer and template molecules,we develop a new molecu-larly imprinted nanospheres with grape grain structures based on multi-hydrogen bonding interactions between melamine and 6-aminouracil.Molecular imprinting-electrochemical sensor was established with the assistance of graphene and ionic liquids.The content of melamine in dairy products was detected by the molecular imprinting-electrochemical sensor.The detection limit was determined to be as low as 1.57×10^(−3) mg kg^(-1).展开更多
基金Supported by the National Natural Science Foundation of China(Nos20575023, 20955001)the Key Project of International Cooperation Foundation of Fujian Province, China(No2006I0021)the Natural Science Foundation of Fujian Province, China(NosD0710017, D0810016 and U0850008)
文摘A sensitive, fast and low-cost molecular imprinted polymeric sensor for quantitative determination of parathion was prepared with chitosan（CS） as function matrix and parathion（PT） as template molecule via constant potential electrochemical deposition. Sensitive response was obtained with a detection limit of 1.0× 10-7 mol/L and an excellent recognition for PT was achieved due to the good memory capacity of the sensor. The developed sensor exhibited good fabrication reproducibility and acceptable stability, which provided a new promising tool for pesticide analysis.
文摘Methacrylic acid with isoproturon has been utilized to prepare molecularly imprinted polymeric (MIP) membrane on Whatman filter paper no. 5 for selective electrochemical estimation of isoproturon pesticide. MIP membrane was prepared by radical polymerization and characterized using Ultra Violet spectrophotometer, Fourier Transform Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Contact angle study was used to determine the surface energy of the MIP membrane and electrical conductivity measurements were performed by applying a small-amplitude alternating voltage (20 mV) with frequencies varying from 20 Hz to 80 kHz generated by a low-frequency wave form generator. Different isoproturon concentrations in samples were tested and analyzed. Results indicate linear increase in membrane resistance with increasing isoproturon in 10-3 to 10-6 M range. The selectivity of the electrochemical sensor was confirmed by testing isoproturon in presence of the structurally related compounds monouran and diuran. Results reveal highly selective and sensitive sensor, which can be employed for regular estimation of isoproturon in fields.
文摘The molecularly imprinted technology and the self-assembly technique were used together on the calixarene surface acoustic wave (SAW) chemical sensors to detect organophosphorus compounds. 25-(thioalkyl-alkoxy)-p-tertbutylcalix[4] arene with self-assembled monolayer character was the sensitive coating of the sensors. The sensors had a special response to organophosphorus compounds and the response frequency shift of this sensor to organophosphorus compounds in 0.1 mg/m3 was 350 Hz. The response frequency increased linearly with the increase of the concentration of DMMP in the range from 0.1 to 0.6 mg/m3. The possible explanation of the interaction between the coatings and organophosphorus compounds was discussed.
文摘Amaranth imprinted nanoparticless were prepared by two-phase mini emulsion polymerization of hydroxyethyl methacrylate and ethylene glycol dimethacrylate using acrylamide and methacrylic acid as functional monomers.The amaranth non-imprinted nanoparticle was prepared with the same procedure without using amaranth.Amaranth imprinted and non-imprinted nanoparticles were attached on the chip surface modified with allyl mercaptan.The surfaces of the surface plasmon resonance(SPR)sensor were characterized by the ellipsometry,contact angle,and atomic force microscopy.Amaranth solutions with different concentrations(0.1 mg/mL-150mg/mL)were prepared with the pH 7.4 phosphate buffer.The limit of detection and limit of quantification were 0.0180mg/mL and 0.06mg/mL,respectively.When the selectivity of the amaranth imprinted SPR sensor was compared with the competing molecules tartrazine and allura red,it was observed that the target molecule amaranth was 5.64 times and 5.18 times more selective than allura red and tartrazine,respectively.The liquid chromatography-mass spectrometry technique(LC-MS)was used for validation studies.According to the results obtained from both SPR sensor and LC-MS analyses,the amaranth recovery(%)from fruit juices was observed between 96%and 99%.
基金J.H.gratefully acknowledges support of this work by the Na-tional Natural Science Foundation of China(Grant Nos.22032003&22072073)the Natural Science Foundation of Shandong Province(ZR2018ZA0547).
文摘By exchanging the conventional role of functional monomer and template molecules,we develop a new molecu-larly imprinted nanospheres with grape grain structures based on multi-hydrogen bonding interactions between melamine and 6-aminouracil.Molecular imprinting-electrochemical sensor was established with the assistance of graphene and ionic liquids.The content of melamine in dairy products was detected by the molecular imprinting-electrochemical sensor.The detection limit was determined to be as low as 1.57×10^(−3) mg kg^(-1).
