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https://www.readbyqxmd.com/read/30098462/trypsin-electrochemical-sensing-using-two-dimensional-molecularly-imprinted-polymers-on-96-well-microplates
#1
Yanxia Li, Chaoyang Jiang
Molecular imprinting is an efficient technology to create artificial receptors with antibody-like binding properties for a variety of applications such as separation and sensing. In this work, a new sensing method was introduced by combining a two-dimensional molecularly imprinted polymer (2D-MIP) film with copper oxide nanoparticles (CuO NPs) labeling for signal conversion and amplification. CuO labeling can effectively monitor the thickness of 2D-MIPs to achieve the best imprinting effect. Trypsin imprinted polymer based electrochemical sensor on 96-well microplates was constructed and a good dynamic response was observed in the range of 0...
July 31, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30096735/well-designed-dopamine-imprinted-polymer-interface-for-selective-and-quantitative-dopamine-detection-among-catecholamines-using-a-potentiometric-biosensor
#2
Taira Kajisa, Wei Li, Tsuyoshi Michinobu, Toshiya Sakata
We report a well-designed biointerface enabling the selective and quantitative detection of dopamine (DA) using a potentiometric biosensor. To enhance the detection selectivity of DA, a DA-templated molecularly imprinted polymer (DA-MIP) was synthesized on the extended Au gate electrode of a field-effect transistor (FET) biosensor. For a quantitative DA analysis, the thickness of the DA-MIP was controlled to ca. 60 nm by surface-initiated atom transfer radical polymerization (SI-ATRP). In this process, the DA-MIP was copolymerized with vinylphenylboronic acid (vinyl-PBA), inducing molecular charges at the biointerface of the FET gate electrode...
October 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30088342/preparation-and-application-of-a-magnetic-plasticizer-as-a-molecularly-imprinted-polymer-adsorbing-material-for-the-determination-of-phthalic-acid-esters-in-aqueous-samples
#3
Shou-Lian Wei, Wan-Ting Liu, Xiao-Chen Huang, Jin-Kui Ma
A novel magnetic plasticizer molecularly imprinted polymers (MIPs) adsorbing material (MIP@mSiO2 -β-CD@Fe3 O4 ) was successfully synthesized for the determination of 6 phthalic acid esters in water, milk and wine samples. The molecularly imprinted polymers were prepared via precipitation polymerization and a surface molecular imprinting technique, using a cyclodextrin-modified magnetic meso-porous material (mSiO2 -β-CD@Fe3 O4 ) as magnetic supporter, dibutyl phthalate and butyl benzyl phthalate as the dual template molecules, methacrylic acid as the functional monomer, and ethyleneglycol dimethacrylate as the cross-linking agent...
August 8, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/30086226/imprinting-directionality-into-proton-transfer-reactions-of-an-achiral-molecule
#4
Jens Kügel, Markus Leisegang, Matthias Bode
Directionality is key for the functionality of molecular machines, which is often achieved by built-in structural chiralities. Here, we present a scanning tunneling microscopy study of achiral H2 Pc and HPc molecules that acquire chirality by adsorption onto a Ag(100) surface. The adsorption-geometry-induced chirality is caused by a -29° (+29°) rotation of the molecules with respect to the [011] substrate direction, resulting in tautomerization processes that preferentially occur in a clockwise (counterclockwise) direction...
August 9, 2018: ACS Nano
https://www.readbyqxmd.com/read/30077952/specific-quantification-of-atropine-using-molecularly-imprinted-polymer-on-graphene-quantum-dots
#5
Alireza Khataee, Javad Hassanzadeh, Elmira Kohan
Herein, development of a reliable and specific fluorometric assay was disclosed for the sensitive detection of atropine. The method was designed using the surface molecularly imprinted polymer on high fluorescent graphene quantum dots (GQDs). Molecularly imprinted polymer capped GQDs (MIP-GQDs) were prepared through the common co-polymerization reaction of 3-(3-aminopropyl) triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS), act as the main functional and cross-linking monomers, respectively. The used template for this reaction was atropine...
July 31, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/30077132/electrochemical-sensing-of-methyl-parathion-on-magnetic-molecularly-imprinted-polymer
#6
Amal H A Hassan, Silio Lima Moura, Fatma H M Ali, Walaa A Moselhy, Maria Del Pilar Taboada Sotomayor, Maria Isabel Pividori
The electrochemical detection of methyl parathion in fish was performed by preconcentrating the pesticide on magnetic molecularly imprinted polymer and further readout on magneto-actuated electrode by square wave voltammetry. The magnetic molecularly imprinted polymer was synthesized by a magnetic core-shell strategy, using methacrylic acid as a functional monomer, and selected by theoretical calculation using the density functional theory (DFT). The characterization of this material was performed by SEM, TEM and XRD...
July 11, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30075383/metal-organic-framework-based-molecularly-imprinted-polymer-as-a-high-sensitive-and-selective-hybrid-for-the-determination-of-dopamine-in-injections-and-human-serum-samples
#7
Wanqing Zhang, Dawei Duan, Shanqin Liu, Yongsheng Zhang, Leipeng Leng, Xinli Li, Na Chen, Yuping Zhang
A highly sensitive and selective molecular imprinting polymer (MIP) sensor was fabricated based on polypyrrole (PPy)/ZIF-67/Nafion hybrid modified glassy carbon electrode (GCE) for the determination of dopamine (DA). The ZIF-67 material was facilely prepared by using hydrothermal synthesis method; subsequently, the PPy/ZIF-67/Nafion hybrid was obtained through a one-pot synthesis method. The physical properties of the materials and the modified sensors were investigated by using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Nitrogen adsorption-desorption isothermal (BET), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM) and Atomic force microspectroscopy (AFM) apparatus...
July 25, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30074768/plant-biomarker-recognition-by-molecular-imprinting-based-lspr-sensor-array-performance-improvement-by-enhanced-hotspot-of-au-nanostructure
#8
Liang Shang, Chuanjun Liu, Bin Chen, Kenshi Hayashi
Detection of plant volatile organic compounds (VOCs) enables monitoring of pests and diseases in agriculture. We previously revealed that a localized surface plasmon resonance (LSPR) sensor coated with a molecularly imprinted sol-gel (MISG) can be used for cis-jasmone vapor detection. Although the selectivity of the LSPR sensor was enhanced by the MISG coating, its sensitivity was decreased. Here, gold nanoparticles (AuNPs) were doped in the MISG to enhance the sensitivity of the LSPR sensor through hot spot generation...
August 3, 2018: ACS Sensors
https://www.readbyqxmd.com/read/30072049/neuroepigenetics-of-mental-illness-the-inside-outs-of-the-outside-within
#9
Bart P F Rutten
Epigenetics refers to environmentally sensitive modifications to DNA and chromatin that regulate gene transcription without altering the genetic sequence itself. Because of the brain's central role in a person's adaptation to dynamic changes in the environment, the field of epigenetic research is particularly pertinent for the neurosciences and mental health and illness. "Neuroepigenetics" refers to the field of epigenetics, as applied to research of the nervous system and related functional abilities...
2018: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/30064818/development-of-a-single-format-membrane-assisted-solvent-extraction-molecularly-imprinted-polymer-technique-for-extraction-of-polycyclic-aromatic-hydrocarbons-in-wastewater-followed-by-gas-chromatography-mass-spectrometry-determination
#10
Somandla Ncube, Nikita Tavengwa, Akhona Soqaka, Ewa Cukrowska, Luke Chimuka
A technique that combines membrane assisted solvent extraction and molecularly imprinted polymer into a single step format has been successfully developed and evaluated for the extraction of the 16 US-EPA priority polycyclic aromatic hydrocarbons in wastewater samples followed by determination using gas chromatography coupled with time of flight mass spectrometry. The technique involves placing the polymer particles into a hydrophobic polypropylene membrane bag which is in contact with an aqueous donor phase...
July 25, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/30064735/detection-of-theophylline-using-molecularly-imprinted-mesoporous-silica-spheres
#11
Tian Gan, Jiebin Li, Aixia Zhao, Jiahui Xu, Dongyun Zheng, Haibo Wang, Yanming Liu
Here, we report a three-dimensional (3D) network molecularly imprinted polymer (MIP) on electrode surface to achieve an efficient and specific detection of theophylline in foodstuffs, using theophylline as the template molecule, mesoporous silica nanospheres (MSNs) as the signal transducer to shuttle electrons, and both phenyltriethoxysilane and pyrrole as functional monomers. The electron microscope images reveal the presence of well-distributed hierarchically MSNs with a pomegranate-like morphology, topped with MIP uniform layer...
December 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/30062362/an-electro-responsive-imprinted-biosensor-with-switchable-affinity-toward-proteins
#12
Yubo Wei, Qiang Zeng, Jianzhi Huang, Qiong Hu, Xinrong Guo, Lishi Wang
We combined electro-responsive materials with molecular imprinted polymers (MIPs) to develop an electro-responsive imprinted biosensor for the first time. As an electric field controlled gate, the biosensor exhibits a novel self-cleaning ability, as well as switchable affinity toward proteins in aqueous media, based on a reversible structure change.
July 31, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30060497/preparation-and-evaluation-of-oseltamivir-molecularly-imprinted-polymer-silica-gel-as-liquid-chromatography-stationary-phase
#13
Ya-Jun Yang, Xi-Wang Liu, Xiao-Jun Kong, Zhe Qin, Zeng-Hua Jiao, Shi-Hong Li, Jian-Yong Li
To improve the chromatographic performance of an oseltamivir (OS) molecularly imprinted polymer (MIP), silica gel coated with an MIP layer for OS (OSMIP@silica gel) was prepared by the surface molecular imprinting technology on the supporter of porous silica gel microspheres. A nonimprinted polymer with the silica gel (NIP@silica gel) was also prepared for comparison. The obtained particles were characterized through FT⁻IR, scanning electron microscopy, specific surface area analysis, and porosity measurements...
July 27, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30060464/improved-enantioselectivity-for-atenolol-employing-pivot-based-molecular-imprinting
#14
Andreea Elena Bodoki, Bogdan-Cezar Iacob, Laura Elena Gliga, Simona Luminita Oprean, David A Spivak, Nicholas A Gariano, Ede Bodoki
In the last few decades, molecular imprinting technology went through a spectacular evolution becoming a well-established tool for the synthesis of highly selective biomimetic molecular recognition platforms. Nevertheless, there is still room for advancement in the molecular imprinting of highly polar chiral compounds. The aim of the present work was to investigate the favorable kosmotropic effect of a ternary complex involving a polar chiral template (eutomer of atenolol) and a functional monomer, bridged by a central metal ion through well-defined, spatially directional coordinate bonds...
July 27, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30058662/molecularly-imprinted-polymers-application-in-pesticide-residue-detection
#15
REVIEW
Saqib Farooq, Jiyun Nie, Yang Cheng, Zhen Yan, Jing Li, Syed Asim Shah Bacha, Aamar Mushtaq, Hui Zhang
Molecularly imprinted polymers (MIPs) are produced using molecular imprinting technology (MIT) and have specific analyte-binding abilities and unique properties, including chemical and thermal stability, reusability, high selectivity, and high sensitivity. The application of MIPs in the detection of pesticides represents an advance and a superior scientific approach owing to their detection and characterization of trace levels in comparison with other methods. In this review, we have summarized the pre-treatment extraction of pesticides with different types of molecularly imprinted polymer for the detection of single and multiple pesticides by elaborating upon their specific extraction efficiency...
July 30, 2018: Analyst
https://www.readbyqxmd.com/read/30057612/recent-progress-of-imprinted-nanomaterials-in-analytical-chemistry
#16
REVIEW
Rüstem Keçili, Chaudhery Mustansar Hussain
Molecularly imprinted polymers (MIPs) are a type of tailor-made materials that have ability to selectively recognize the target compound/s. MIPs have gained significant research interest in solid-phase extraction, catalysis, and sensor applications due to their unique properties such as low cost, robustness, and high selectivity. In addition, MIPs can be prepared as composite nanomaterials using nanoparticles, multiwalled carbon nanotubes (MWCNTs), nanorods, quantum dots (QDs), graphene, and clays. This review paper aims to demonstrate and highlight the recent progress of the applications of imprinted nanocomposite materials in analytical chemistry...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/30056301/micro-patterned-molecularly-imprinted-polymer-structures-on-functionalized-diamond-coated-substrates-for-testosterone-detection
#17
Evelien Kellens, Hannelore Bové, Thijs Vandenryt, Jeroen Lambrichts, Jolien Dekens, Sien Drijkoningen, Jan D'Haen, Ward De Ceuninck, Ronald Thoelen, Tanja Junkers, Ken Haenen, Anitha Ethirajan
Molecularly imprinted polymers (MIPs) can selectively bind target molecules and can therefore be advantageously used as a low-cost and robust alternative to replace fragile and expensive natural receptors. Yet, one major challenge in using MIPs for sensor development is the lack of simple and cost-effective techniques that allow firm fixation as well as controllable and consistent receptor material distribution on the sensor substrate. In this work, a convenient method is presented wherein microfluidic systems in conjunction with in situ photo-polymerization on functionalized diamond substrates are used...
July 17, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30056300/hybrid-molecularly-imprinted-polymer-for-amoxicillin-detection
#18
Akinrinade George Ayankojo, Jekaterina Reut, Andres Öpik, Andreas Furchner, Vitali Syritski
The potential adverse effects of the environmental presence of antibiotics on the ecosystem demands the development of new methods suitable for accurate detection of these micropollutants in various aquatic media. An analytical method exploiting the synergistic effect of a label-free sensing platform combined with a molecularly imprinted polymer (MIP) as robust recognition element could represent an efficient tool for the real-time monitoring of antibiotics. In this work, a hybrid organic-inorganic MIP film (AMO-MIP) selective towards amoxicillin (AMO) was synthesized and integrated with a surface plasmon resonance (SPR) sensor...
July 19, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30055799/regulation-mechanism-of-long-non-coding-rna-in-plant-response-to-stress
#19
Xi Sun, Hongxiang Zheng, Na Sui
Long non-coding RNA (lncRNA) is a non-coding RNA greater than 200 nucleotides in length. LncRNAs can regulate gene expression at transcription and post-transcription, epigenetic level, and plays an important role in a wide range of biological processes such as genomic imprinting, chromatin remodeling, transcriptional activation, transcriptional interference and cell cycle. It becomes the current hot topics in the study of molecular biology and genetics. Emerging evidence proposed that lncRNAs play important roles in response to both abiotic and biotic stress...
July 17, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/30054444/early-parity-epigenetic-footprint-of-foxa1-gene-body-in-normal-breast-tissue-of-iranian-women
#20
Zahra Zendehbad, Pantea Izadi, Abdolreza Daraei, Mir Saeed Yekaninejad, Nahid Nafissi, Nasim Younosi, Ghasemali Khorasani, Javad Tavakkoly Bazzaz
Background: Young age at First Full Term Pregnancy (FFTP) is an important factor in breast cancer risk reduction. It is postulated that this protective effect is the result of stable molecular signatures imprinted by physiological process of pregnancy, but the molecular mechanism of this protective role is unclear. The aim of the current study was to identify the effect of early FFTP on methylation status of FOXA1 gene body. FOXA1 is an essential transcription factor for mammary gland development and estrogen responsiveness of breast tissue...
July 28, 2018: Iranian Biomedical Journal
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