Gadolinium chelate monomer based memories onto QCM electrodes for folic acid detection in commercial follow-on baby milk

WOS:000452363700066A novel folic acid-imprinted quartz crystal microbalance (QCM) nanosensor in order to detect folic acid depending on the fabrication of folic acid-imprinted polymer film on a QCM electrode was developed with methacrylamidoantipyrine-gadolinium (III) [MAAP-Gd(III)] used as a monomer for metal coordination-chelation interaction to obtain a more selective molecularly imprinted polymers (MIPs). The developed folic acid-imprinted nanosensor on the MIP/QCM detection system showed outstanding properties such as a stronger affinity of 3.07x10(7)M(-1), a short response time of 10min, wider linear range of 0-100 mu M, a selectivity of k=8.25 and lower detection limit of 0.0080 mu M. After characterizing its all features, the newly designed folic acid-imprinted QCM nanosensor was utilized to detect folic acid level in commercial follow-on baby milk in order to determine its use in real samples

Metal chelate based site recognition of ceruloplasmin using molecularly imprinted polymer/cryogel system

In the present study, N-Acetylneuraminic acid (NANA)-imprinted poly(2-hydroxyethyl methacrylate- N-methacryloyl-(L)-histidin-Cu(II)) p(HEMA-(MAH)2-Cu(II)) has been synthesized by radical polymerization for site recognition of ceruloplasmin. Prepared imprinted cryogel has been characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). When the binding capacity of NANA-imprinted cryogel (MIP) was compared with nonimprinted cryogel (NIP), it was found that MIP has higher adsorption capacity. The maximum amount of binding NANA has found as 83.20 mgg−1 at pH 7.0 with flow rate of 1 mLmin−1 at 25°C. Selectivity experiments for MIP and NIP cryogel have been carried out via the NANA/D-mannose and ceruloplasmin/immunoglobulin G (IgG) pair separately and the relative selectivity coefficient (k’) has found as 77.46 and 17.97, respectively. Applicable of the MIP in human serum has been studied and resulted successfully

Development of a highly sensitive MIP based-QCM nanosensor for selective determination of cholic acid level in body fluids

Determination of cholic acid is very important and necessary in body fluids due to its both pharmaceutical and clinical significance. In this study, a quartz crystal microbalance (QCM) nanosensor, which is imprinted cholic acid, has been developed for the assignation of cholic acid. The cholic acid selective memories have been generated on QCM electrode surface by using molecularly imprinted polymer (MIP) based on methacryloylamidohistidine-copper (II) (MAH-Cu(II)) pre-organized monomer. The cholic acid imprinted nanosensor was characterized by atomic force microscopy (AFM) and then analytical performance of the cholic acid imprinted QCMnanosensorwas studied. The detection limitwas found to be 0.0065 µMwith linear range of 0.01–1000 µM. Moreover, the high value of Langmuir constant (b) (7.3 * 105) obtained by Langmuir graph showed that the cholic acid imprinted nanosensor had quite strong binding sites affinity. At the last step of this procedure, cholic acid levels in body fluids were determined by the prepared imprinted QCM nanosensor

Design and Preparation of Nano-Lignin Peroxidase (NanoLiP) by Protein Block Copolymerization Approach

This study describes the preparation of nanoprotein particles having lignin peroxidase (LiP) using a photosensitive microemulsion polymerization technique. The protein-based nano block polymer was synthesized by cross-linking of ligninase enzyme with ruthenium-based aminoacid monomers. This type polymerization process brought stability in different reaction conditions, reusability and functionality to the protein-based nano block polymer system when compared the traditional methods. After characterization of the prepared LiP copolymer nanoparticles, enzymatic activity studies of the nanoenzymes were carried out using tetramethylbenzidine (TMB) as the substrate. The parameters such as pH, temperature and initial enzyme concentration that affect the activity, were investigated by using prepared nanoLip particles and compared to free LiP. The reusability of the nano-LiP particles was also investigated and the obtained results showed that the nano-LiP particles exhibited admirable potential as a reusable catalyst

Gold-silver-nanoclusters having cholic acid imprinted nanoshell

WOS:000303305700055PubMed:22483924Molecular imprinted polymers (MIPs) as a recognition element for sensors are increasingly of interest and MIP-nanoparticles have started to appear in the literature. In this study, we have proposed a novel thiol ligand-capping method with polymerizable methacryloylamido-cysteine (MAC) attached to gold-silver-nanoclusters reminiscent of a self-assembled monolayer and have reconstructed surface shell by synthetic host polymers based on molecular imprinting method for cholic acid recognition. In this method, methacryloylamidohistidine-Pt(II)IMAH-Pt(II)] has used as a new metal-chelating monomer via metal coordination-chelation interactions and cholic acid. Nanoshell sensors with templates give a cavity that is selective for cholic acid. The cholic acid can simultaneously chelate to Pt(II) metal ion and fit into the shape-selective cavity. Thus, the interaction between Pt(II) ion and free coordination spheres has an effect on the binding ability of the gold-silver-nanoclusters nanosensor. The binding affinity of the cholic acid imprinted nanoparticles have investigated by using the Langmuir and Scatchard methods and determined affinity constant (K-affinity) has found to be 2.73 x 10(4) mol L-1 and 2.13 x 10(8) mol L-1. respectively. At the last step of this procedure, cholic acid level in blood serum and urine which belong to a healthy people were determined by the prepared gold-silver-nanoclusters. (C) 2012 Elsevier B.V. All rights reserved

Ferritin based bionanocages as novel biomemory device concept

WOS:000424853700004PubMed:29277010Ferritin is an iron cage having protein, capable of extracting metal ions in their cages and a consequence of the electron transfer of metal ions in their cage by reduction and oxidation processes, electrochemical information storage devices can be designed. In this work, ferritin based protein biomemory substrate has been synthesized by using Amino Acid (monomer) Decorated and Light Underpinning Conjugation Approach (ANADOLUCA) method, which utilizes photosensitive electron transfer based microemulsion co-polymerization as nanobead form of ferritin. Protein substrate contains metal ions such as silver and copper or metal ion pairs namely, silver copper (Janus bionanocage) and co-polymeric shell of the photosensitive crosslinker protein. The redox behavior of bionanocages differentiates electrochemical "writing" and "erase states depending on these metal ions (silver or copper) or metal ion pairs. The bionanocages based biomemory substrates have been immobilized using graphene modified glassy carbon electrodes and the memory functions of ferritin based bionanocages have been confirmed by chronoamperometry (CA) and open circuit potential amperometry (OCPA). The stability and durability of multi-state memory devices represent promising properties for future bioelectronic information technologies

Molecular Imprinting Technology in Quartz Crystal Microbalance (QCM) Sensors

Molecularly imprinted polymers (MIPs) as artificial antibodies have received considerable scientific attention in the past years in the field of (bio)sensors since they have unique features that distinguish them from natural antibodies such as robustness, multiple binding sites, low cost, facile preparation and high stability under extreme operation conditions (higher pH and temperature values, etc.). On the other hand, the Quartz Crystal Microbalance (QCM) is an analytical tool based on the measurement of small mass changes on the sensor surface. QCM sensors are practical and convenient monitoring tools because of their specificity, sensitivity, high accuracy, stability and reproducibility. QCM devices are highly suitable for converting the recognition process achieved using MIP-based memories into a sensor signal. Therefore, the combination of a QCM and MIPs as synthetic receptors enhances the sensitivity through MIP process-based multiplexed binding sites using size, 3D-shape and chemical function having molecular memories of the prepared sensor system toward the target compound to be detected. This review aims to highlight and summarize the recent progress and studies in the field of (bio)sensor systems based on QCMs combined with molecular imprinting technology

Concanavalin A photocross-linked affinity cryogels for the purification of horseradish peroxidase

The present study describes an easy and efficient procedure for the purification of horseradish peroxidase from horseradish roots. For this purpose, supermacroporous cryogels having Concanavalin A were prepared by photosensitive cross-linking polymerization. Horseradish peroxidase binding and elution from the prepared cryogels were carried out changing various parameters such as initial peroxidase concentration and pH. The best binding performance was obtained at pH 7.0. The maximum horseradish peroxidase binding of the cryogels was found to be 3.85 mg g −1 cryogel. Horseradish peroxidase purification from crude extract resulted in 115.1-fold. SDS-PAGE analysis and circular dichroism measurements indicated that the horseradish peroxidase purification from horseradish roots was successfully carried out