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https://www.readbyqxmd.com/read/28531992/boronate-functionalized-hydrogel-as-a-novel-biosensing-interface-for-the-glycated-hemoglobin-a1c-hba1c-based-on-the-competitive-binding-with-signaling-glycoprotein
#1
Yong Duk Han, Ka Ram Kim, Yoo Min Park, Seung Yeon Song, Yong Ju Yang, Kangsun Lee, Yunhee Ku, Hyun C Yoon
According to recent increases in public healthcare costs associated with diabetes mellitus, the development of new glycemic monitoring techniques based on the biosensing of glycated hemoglobin A1c (HbA1c), a promising long-term glycemic biomarker, has become a major challenge. In the development of HbA1c biosensors for point-of-care applications, the selection of an effective biorecognition layer that provides a high reaction yield and specificity toward HbA1c is regarded as the most significant issue. To address this, we developed a novel HbA1c biosensing interfacial material by the integration of boronate hydrogel with glass fiber membrane...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28525854/sensitive-sulfide-ion-detection-by-optofluidic-catalytic-laser-using-horseradish-peroxidase-hrp-enzyme
#2
Chaoyang Gong, Yuan Gong, Maung Kyaw Khaing Oo, Yu Wu, Yunjiang Rao, Xiaotian Tan, Xudong Fan
We report an optofluidic catalytic laser for sensitive sulfide ion detection. In the catalytic reaction, horseradish peroxidase (HRP) enzyme is used for catalyzing the non-fluorescent substrate, 10-Acetyl-3,7-dihydroxyphenox-azine (ADHP), to produce highly fluorescent resorufin, which was used as gain medium for lasing. Using sulfide ions as inhibitors, the catalytic reaction slows down, resulting in a delay in the lasing onset time, which is used as the sensing signal. The sensing mechanism of the catalytic laser is theoretically analyzed and the performance is experimentally characterized...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28523913/expression-and-characterization-of-windmill-palm-tree-trachycarpus-fortunei-peroxidase-by-pichia-pastoris
#3
Boting Wen, Margaret R Baker, Hongwei Zhao, Zongjun Cui, Qing Xiao Li
Currently, commercial plant peroxidases are all native and are isolated from plants such as horseradish and soybean. No recombinant plant peroxidase products have been available on the commercial market. The gene encoding peroxidase was cloned from windmill palm tree leaves. The codon-optimized gene was transformed into Pichia pastoris for expression. The recombinant windmill palm tree peroxidase (rWPTP) expressed by P. pastoris showed high stability under pH 2-10, temperature up to 70 C, to many metallic salts and organic solvents...
May 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28523275/online-detection-of-peroxidase-using-3d-printing-active-magnetic-mixing-and-spectra-analysis
#4
Shanshan Bai, Chengqi Gan, Gaozhe Cai, Lei Wang, Mingyong Chen, Qingan Han, Jianhan Lin
A new method for online detection of peroxidase (POD) using 3D printing, active magnetic mixing, fluidic control, and optical detection was developed and demonstrated in this study. The proposed POD detection system consisted of a 3D printing and active magnetic mixing based fluidic chip for online catalytic reaction, an optical detector with a fluidic flow cell for quantitative determination of the final catalysate, and a single-chip microcontroller based controller for automatic control of two rotating magnetic fields and four precise peristaltic pumps...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28516982/colorimetric-and-electrochemical-quantification-of-global-dna-methylation-using-a-methyl-cytosine-specific-antibody
#5
Md Hakimul Haque, Ripon Bhattacharjee, Md Nazmul Islam, Vinod Gopalan, Nam-Trung Nguyen, Alfred K Lam, Muhammad J A Shiddiky
We report a simple colorimetric (naked-eye) and electrochemical method for the rapid, sensitive and specific quantification of global methylation levels using only 25 ng of input DNA. Our approach utilises a three-step strategy; (i) initial adsorption of the extracted, purified and denatured bisulfite-treated DNA on a screen-printed gold electrode (SPE-Au), (ii) immuno-recognition of methylated DNA using a horseradish peroxidase (HRP)-conjugated methylcytosine (HRP-5mC) antibody and (iii) subsequent colorimetric detection by the enzymatic oxidation of 3,3',5,5'-tetramethylbenzidin (TMB)/H2O2 which generated a blue-coloured product in the presence of methylated DNA and HRP-5mC immunocomplex...
May 18, 2017: Analyst
https://www.readbyqxmd.com/read/28513542/biomimetic-synthesis-of-resveratrol-trimers-catalyzed-by-horseradish-peroxidase
#6
Jian-Qiao Zhang, Gan-Peng Li, Yu-Long Kang, Bin-Hao Teng, Chun-Suo Yao
Biotransformation of trans-resveratrol and synthetic (±)-ε-viniferin in aqueous acetone using horseradish peroxidase and hydrogen peroxide as oxidants resulted in the isolation of two new resveratrol trimers (3 and 4), one new resveratrol derivative (5) with a dihydrobenzofuran skeleton, together with two known stilbene trimers (6 and 7), and six known stilbene dimers (8-13). Their structures and relative configurations were identified through spectral analysis and possible formation mechanisms were also discussed...
May 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28508471/needleless-emulsion-electrospinning-for-the-regulated-delivery-of-susceptible-proteins
#7
Matej Buzgo, Eva Filova, Andrea Mickova Staffa, Michala Rampichova, Miroslav Doupnik, Karolina Vocetkova, Vera Lukasova, Radka Kolcun, David Lukas, Alois Necas, Evzen Amler
In the present work, we developed a novel needleless emulsion electrospinning technique which improves the production rate of the core/shell production process. The nanofibers are based on PCL as a continuous phase combined with a droplet phase based on Pluronic F-68 (PF-68). The PCL-PF-68 nanofibers show a time-regulated release of active molecules. Needleless emulsion electrospinning was used to encapsulate diverse set of compounds to the core phase (i.e. 5-DTAF-PF68, horseradish peroxidase (HRP), TRITC-dextran, insulin growth factor I (IGF-I), transforming growth factor beta (TGF-beta) and basic fibroblast growth factor (bFGF))...
May 16, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28501172/combining-phagomagnetic-separation-with-immunoassay-for-specific-fast-and-sensitive-detection-of-staphylococcus-aureus
#8
Chenghui Yan, Yun Zhang, Hang Yang, Junping Yu, Hongping Wei
A Staphylococcus aureus (S. aureus)-specific lytic bacteriophage P-S. aureus-9, isolated from an environmental water sample, was assembled on magnetic beads for capturing S. aureus from samples through magnetic separation. Horseradish Peroxidase (HRP) labeled immunoglobulin (IgG) antibodies were used to detect the captured S. aureus by reacting with protein A on S. aureus followed by colorimetric signals, which were generated from the catalytic reaction between HRP and the substrate 3,3',5,5'-Tetramethylbenzidine (TMB)...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28500946/pa-tb-cu-mof-as-luminescent-nanoenzyme-for-catalytic-assay-of-hydrogen-peroxide
#9
Zewan Qi, Li Wang, Qi You, Yang Chen
Metal organic frameworks (MOFs) with flexible structures and components have aroused great interest in designing functional materials. In this work, we designed and made a kind of PA-Tb-Cu MOF nanoenzyme capable of emitting fluorescence for the catalytic reaction of hydrogen peroxide (H2O2). Luminescent Tb(3+), catalytic Cu(2+) and bridging ligand were assembled and integrated into a single material nanoenzyme. This PA-Tb-Cu MOF nanoenzyme not only possessed excellent catalytic activity comparable to horseradish peroxidase but also can real-time fluorescently indicate the concentration of H2O2 as low as 0...
May 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28497968/chemoenzymatic-synthesis-and-%C3%AE-glucosidase-inhibitory-activity-of-dimeric-neolignans-inspired-by-magnolol
#10
Luana Pulvirenti, Vera Muccilli, Nunzio Cardullo, Carmela Spatafora, Corrado Tringali
A chemoenzymatic synthesis of a small library of dimeric neolignans inspired by magnolol (1) is reported. The 2-iodoxybenzoic acid (IBX)-mediated regioselective ortho-hydroxylation of magnolol is described, affording the bisphenols 6 and 7. Further magnolol analogues (12, 13, 15-17, 19-23) were obtained from eugenol (3), tyrosol (4), and homovanillic alcohol (5), through horseradish peroxidase (HRP)-mediated oxidative coupling and regioselective ortho-hydroxylation or ortho-demethylation in the presence of IBX, followed by reductive treatment with Na2S2O4...
May 12, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28495446/mechanism-of-hrp-catalyzed-nitrite-oxidation-by-h2o2-revisited-effect-of-nitroxides-on-enzyme-inactivation-and-its-catalytic-activity
#11
Amram Samuni, Eric Maimon, Sara Goldstein
The peroxidative activity of horseradish peroxidase (HRP) undergoes progressive inactivation while catalyzing the oxidation of nitrite by H2O2. The extent of inactivation increases as the pH increases, [nitrite] decreases or [H2O2] increases, and is accompanied by a loss of the Soret peak of HRP along with yellow-greenish coloration of the solution. HRP-catalyzed nitrite oxidation by H2O2 involves not only the formation of compounds I and II as transient heme species, but also compound III, all of which in turn, oxidize nitrite yielding (•)NO2...
May 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28495100/ultrasensitive-direct-competitive-flisa-using-highly-luminescent-quantum-dot-beads-for-tuning-affinity-of-competing-antigens-to-antibodies
#12
Sicheng Xiong, Yaofeng Zhou, Xiaolin Huang, Ruijin Yu, Weihua Lai, Yonghua Xiong
Herein, for the first time we report a novel direct competitive fluorescence-linked immunosorbent assay (dcFLISA) for the ultrasensitive detection of ochratoxin A (OTA) by introducing a large size polymer beads loaded with quantum dots (QBs) as carrier of competing antigen for decreasing binding affinity to antibody and enhancing the fluorescent signal intensity. When using 255 nm QBs as carrier of competing antigen, the equilibrium dissociation constant of QB based competing antigen to antibodies can be tuned to 100 times higher than that of the horseradish peroxidase (HRP) based competing antigen by controlling labeled amounts of antigen on the surface of QBs...
June 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28494030/antibody-nanoparticle-conjugates-to-enhance-the-sensitivity-of-elisa-based-detection-methods
#13
Margaret M Billingsley, Rachel S Riley, Emily S Day
Accurate antigen detection is imperative for clinicians to diagnose disease, assess treatment success, and predict patient prognosis. The most common technique used for the detection of disease-associated biomarkers is the enzyme linked immunosorbent assay (ELISA). In an ELISA, primary antibodies are incubated with biological samples containing the biomarker of interest. Then, detectible secondary antibodies conjugated with horseradish peroxidase (HRP) bind the primary antibodies. Upon addition of a color-changing substrate, the samples provide a colorimetric signal that directly correlates to the targeted biomarker concentration...
2017: PloS One
https://www.readbyqxmd.com/read/28490098/unravelling-important-odorants-in-horseradish-armoracia-rusticana
#14
Eva-Maria Kroener, Andrea Buettner
Horseradish (Armoracia rusticana) is a plant well known for its roots' spicy aroma. The present study investigates the main aroma constituents of horseradish roots in general by analysing the aroma profiles of six different horseradish varieties, with one variety grown in two different soils. Odorants were characterised by means of gas chromatography-olfactometry and identified via their mass spectra, retention indices on two columns with different polarity, and their characteristic odour. A series of new aroma compounds from different substance groups were identified that have hitherto not been described in horseradish...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28490082/spasmolytic-antimicrobial-and-cytotoxic-activities-of-5-phenylpentyl-isothiocyanate-a-new-glucosinolate-autolysis-product-from-horseradish-armoracia-rusticana-p-gaertn-b-mey-scherb-brassicaceae
#15
Milan S Dekić, Niko S Radulović, Nikola M Stojanović, Pavle J Randjelović, Zorica Z Stojanović-Radić, Stevo Najman, Sanja Stojanović
Detailed analyses of horseradish autolysates led to the identification of a new natural product, 5-phenylpentyl isothiocyanate (PhPeITC). The structural assignment was corroborated by synthesis, and the identity unequivocally established by spectral means. The occurrence of PhPeITC is the first direct proof of the existence of a 5-phenylpentyl glucosinolate in the aerial parts of this species as one of the possible "mustard oil" precursors. To verify its possible contribution to the horseradish functional food status, horseradish above- and underground autolysates, together with five ω-phenylalkyl isothiocyanates were tested for their spasmolytic, cytotoxic and antimicrobial activities...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28485250/localization-of-trefoil-factor-family-peptide-3-in-epithelial-tissues-originating-from-the-three-germ-layers-of-developing-mouse-embryo
#16
Nikola Bijelić, Tatjana Belovari, Maja Tolušić Levak, Mirela Baus Lončar
Trefoil factor family (TFF) peptides are involved in the maintenance of epithelial integrity and epithelial restitution. Mature epithelial tissues originate from different embryonic germ layers. The objective of this research was to explore the presence and localization of TFF3 peptide in mouse embryonic epithelium and to examine if the occurrence of TFF3 is germ layer-dependent. Mouse embryos (14-18 days old) were fixed in 4% paraformaldehyde and embedded in paraffin. Immunohistochemistry was performed with affinity purified rabbit anti-TFF3 antibody, goat anti-rabbit biotinylated secondary antibody and streptavidin-horseradish peroxidase, followed by 3,3'-diaminobenzidine...
May 9, 2017: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28483576/a-high-sensitive-epitope-imprinted-electrochemical-sensor-for-bovine-serum-albumin-based-on-enzyme-amplifying
#17
Meng-Xi Li, Xing-Hua Wang, Lian-Ming Zhang, Xiao-Ping Wei
To improve the sensitivity of the molecular imprinting sensor detection of protein, a new strategy based on enzyme amplification was proposed. The determination of bovine serum albumin (BSA) was achieved by using the epitope imprinted techniques coupling with electrochemical measurement method. Nonapeptide, separated from BSA, was selected as a template molecule to prepare the molecularly imprinted polymer (MIP) film, and it could bind with the cavities of the MIP. By the use of epitope imprinted techniques, BSA can be recognized by the MIP via the nonapeptide on the surface of BSA...
May 5, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28474514/in-situ-forming-and-h2o2-releasing-hydrogels-for-treatment-of-drug-resistant-bacterial-infections
#18
Yunki Lee, Kyong-Hoon Choi, Kyung Min Park, Jong-Min Lee, Bong Joo Park, Ki Dong Park
Various types of commercialized wound dressings (e.g., films, foams, gels, and nanofiber meshes) have been clinically used as a physical barrier against bacterial invasion and as wound-healing materials. Although these dressings can protect the wounded tissue from the external environment, they cannot treat the wounds that are already infected with bacteria. Herein, we report in situ H2O2-releasing hydrogels as an active wound dressing with antibacterial properties for treatment of drug-resistant bacterial infection...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28474157/bioanalytical-application-of-peroxidase-mimicking-dnazymes-status-and-challenges
#19
J Kosman, B Juskowiak
DNAzymes with peroxidase-mimicking activity are a new class of catalytically active DNA molecules. This system is formed as a complex of hemin and a G-quadruplex structure created by oligonucleotides rich in guanine. Considering catalytic activity, this DNAzyme mimics horseradish peroxidase, the enzyme most commonly used for signal generation in bioassays. Because DNAzymes exhibit many advantages over protein enzymes (thermal stability, easy and cheap synthesis and purification) they can successfully replace HRP in bioanalytical applications...
May 5, 2017: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/28471642/paper-microzone-plates-as-analytical-tools-for-studying-enzyme-stability-a-case-study-on-the-stabilization-of-horseradish-peroxidase-using-trehalose-and-su-8-epoxy-novolac-resin
#20
Kirsten A Ganaja, Cory A Chaplan, Jingyi Zhang, Nathaniel W Martinez, Andres W Martinez
Paper microzone plates in combination with a noncontact liquid handling robot were demonstrated as tools for studying the stability of enzymes stored on paper. The effect of trehalose and SU-8 epoxy novolac resin (SU-8) on the stability of horseradish peroxidase (HRP) was studied in both a short-term experiment, where the activity of various concentrations of HRP dried on paper were measured after 1 h, and a long-term experiment, where the activity of a single concentration of HRP dried and stored on paper was monitored for 61 days...
May 4, 2017: Analytical Chemistry
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