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Search results for: Rabbit Anti-Phospho-SHP2 SHIP2(Tyr1135) Polyclonal Antibody, Biotin Conjugated

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#31621104   2019/11/14 To Up

Development of a double-antibody sandwich ELISA for sensitive detection of Yersinia pestis.

We developed a biotin-streptavidin-based sandwich ELISA for the sensitive and specific detection of Yersinia pestis. In this assay, the F1 capsular protein and Y. pestis were captured by anti-F1 mouse monoclonal antibody followed by detection with biotinylated-anti-F1 rabbit polyclonal antibody and HRP-conjugated streptavidin. The developed F1 ELISA could detect not only the F1 protein up to 29 and 17 pg/ml but also Y. pestis up to 177.8 and 129.2 CFU/ml in PBS buffer and human serum, respectively. In addition, the F1 ELISA did not show any cross-reactivity with various proteins and bacterial strains.
Sang-Yoon Choi, Gi-Eun Rhie, Jun Ho Jeon

1047 related Products with: Development of a double-antibody sandwich ELISA for sensitive detection of Yersinia pestis.

1 kit100ug Lyophilized100ug100ug100ug Lyophilized100ug100ug100ug Lyophilized100ug100ug Lyophilized100ug96 tests

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#30800246   // To Up

Characterization of Monoclonal and Polyclonal Antibodies Recognizing Prostate Specific Antigen: Implication for Design of a Sandwich ELISA.

Prostate cancer is the second most common cancer in men. Prostate-Specific Antigen (PSA) is a tumor-associated glycoprotein with enzymatic activity which is secreted by the prostate gland. Following entry to the blood, 70-90% of PSA forms complexes with protease inhibitors and its enzymatic activity is inhibited. The serum level of PSA is increased and the rate of free PSA (fPSA) to total PSA is decreased in prostate cancer patients. Therefore, measurement of PSA and fPSA in serum is very valuable for diagnosis and prognosis of prostate cancer.
Sahar Raoofi Mohseni, Forough Golsaz-Shirazi, Mostafa Hosseini, Jalal Khoshnoodi, Tannaz Bahadori, Mohammad Ali Judaki, Mahmood Jeddi-Tehrani, Fazel Shokri

2213 related Products with: Characterization of Monoclonal and Polyclonal Antibodies Recognizing Prostate Specific Antigen: Implication for Design of a Sandwich ELISA.

0.2 mg1 kit(96 Wells)0.1 ml 6 ml Ready-to-use 100 2 ml Ready-to-use 25 µg100 ug/vial100.00 ug0.2 mg0.25 mg1 mg

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#26248424   // To Up

[Establishment and evaluation of methods for determinating cystic fibrosis transmembrane conductance regulator quantitatively].

To establish and evaluate a BA-ELISA method for the quantitative detection of cystic fibrosis transmembrane conductance regulator (CFTR) protein.
Feng Qiu, Jie Zeng, Kun Li, Ai-jun Chen, Wan-xiang Xu, Ya Ni

1696 related Products with: [Establishment and evaluation of methods for determinating cystic fibrosis transmembrane conductance regulator quantitatively].

100ul25 mg0.1 mg5 mg100ug100ug Lyophilized96T100ul5 Modulators10 mg0.12 mL

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#24931549   2014/06/12 To Up

A heterogeneous biotin-streptavidin-amplified enzyme-linked immunosorbent assay for detecting tris(2,3-dibromopropyl) isocyanurate in natural samples.

Tris(2,3-dibromopropyl) isocyanurate (TBC) is a novel brominated flame retardant (BFR) that is widely used to substitute the prohibited BFRs throughout the world. With the development of research, the potential environmental and ecological harms of TBC have been revealed. For sensitive and selective detecting TBC, an indirect competitive biotin-streptavidin-amplified enzyme-linked immunosorbent assay (BA-ELISA) has been established in this study. The small molecular TBC-hapten was synthesized first; it mimicked the chemical structure of TBC and possessed a secondary amine group. The as-obtained hapten was then conjugated with carrier proteins to prepare artificial antigen. After immunization, the anti-TBC polyclonal antibody was obtained from separating rabbit serum. The procedures of this BA-ELISA were optimized. Under the optimal conditions, the limit of detection (IC10) was 0.0067 ng/ml and the median inhibitory concentration (IC50) was 0.66 ng/ml. Cross-reactivity values of the BA-ELISA with the tested TBC analogues were ⩽5%. This immunoassay was successfully applied to determine the TBC residue in river water samples that were collected near a BFR manufacturing plant. Satisfactory recoveries (92.1-109.2%) were obtained. The results indicated that this proposed BA-ELISA is suitable for the rapid and sensitive determining of TBC in environmental monitoring.
Dan Bu, Huisheng Zhuang, Xinchu Zhou, Guangxin Yang

2264 related Products with: A heterogeneous biotin-streptavidin-amplified enzyme-linked immunosorbent assay for detecting tris(2,3-dibromopropyl) isocyanurate in natural samples.

96 samples96 samples96 samples900 tests48 samples96 samples100 assays100ug16 Arrays/SlideFor 2 miRNA probes, each 100ug Lyophilized

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#23833764   2013/07/08 To Up

Electrochemical immunoassay for Salmonella Typhimurium based on magnetically collected Ag-enhanced DNA biobarcode labels.

We describe a sensitive electrochemical immunoassay for Salmonella enterica serovar Typhimurium, a common foodborne pathogen which can cause infection at extremely small doses. The assay is based on the recognition of DNA biobarcode labels by differential pulse anodic stripping voltammetry (DPASV), following Ag enhancement. The biobarcodes consist of latex spheres (mean diameter 506 nm ± 22 nm) modified by ferromagnetic Fe3O4 particles. Each biobarcode is loaded by adsorption with approx. 27 molecules of mouse monoclonal antibody against S. Typhimurium and 3.5 × 10(5) molecules of 12 mer ssDNA. The assay is performed by adding the biobarcode, S. Typhimurium cells, and biotin-conjugated rabbit polyclonal antibody against Salmonella into well plates. After antigen-antibody binding, magnetic collection enables the excess polyclonal antibody to be washed off. Exposure to avidin-coated screen printed electrodes, and formation of the avidin-biotin bond, then enables the excess biobarcode to be removed. The biobarcode remaining on the electrode is quantified by DPASV measurement of Ag(+) ions following catalytic Ag deposition. The assay showed a negligible response to 10(7) CFU mL(-1)E. coli and had a limit of detection of 12 CFU mL(-1) in buffer, and 13 to 26 CFU mL(-1) for heat-killed and whole cell S. Typhimurium in plain milk, green bean sprouts and raw eggs. To the best of our knowledge, this is the lowest reported limit of detection for Salmonella by an electrochemical immunoassay not requiring sample pre-enrichment.
Feby Wijaya Pratiwi, Patsamon Rijiravanich, Mithran Somasundrum, Werasak Surareungchai

1145 related Products with: Electrochemical immunoassay for Salmonella Typhimurium based on magnetically collected Ag-enhanced DNA biobarcode labels.

100ug Lyophilized100ug Lyophilized2 mL100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100 100ug Lyophilized

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#21406139   2011/03/16 To Up

Participation of the 39-kDa glycoprotein (gp39) of the vitelline envelope of Bufo arenarum eggs in sperm-egg interaction.

The acquisition of egg fertilizability in Bufo arenarum takes place during the oviductal transit and during this process the extracellular coelomic envelope (CE) of the eggs is converted into the vitelline envelope (VE). It has been stated that one of the necessary events leading to a fertilizable state is the proteolytic cleavage of CE glycoproteins in the oviductal pars recta by oviductin, a serine protease. Consequently, there is a marked increase in the relative quantity of glycoproteins with 39 (gp39) and 42 kDa (gp42) in the VE. In the present study, sperm-VE binding assays using heat-solubilized biotin-conjugated VE glycoproteins revealed that both gp39 and gp42 have sperm binding capacity. According to this result, our study was focused on gp39, a glycoprotein that we have previously reported as a homologue of mammalian ZPC. For this purpose, rabbit polyclonal antibodies against gp39 were generated at our laboratory. The specificity of the antibodies was confirmed with western blot of VE glycoproteins separated on SDS-PAGE. Immunohistochemical and immunoelectron studies showed gp39 distributed throughout the width of the VE. In addition, immunofluorescence assays probed that gp39 bound to the sperm head. Finally, as an approach to elucidate the possible involvement of gp39 in fertilization, inhibition assays showed that pretreatment of eggs with antibodies against gp39 generated a significant decrease in the fertilization rate. Therefore, our findings suggest that gp39, which is modified by oviductal action, participates as a VE glycoprotein ligand for sperm in Bufo arenarum fertilization.
Daniel Barrera, Ricardo J Llanos, Dora C Miceli

2296 related Products with: Participation of the 39-kDa glycoprotein (gp39) of the vitelline envelope of Bufo arenarum eggs in sperm-egg interaction.

5 G1100.00 ul1 Set

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#16183151   2005/09/23 To Up

Folic acid reduces adhesion molecules VCAM-1 expession in aortic of rats with hyperhomocysteinemia.

To investigate effects of supplementation of folic acid on the expression of adhesion molecules VCAM-1 in the aortas of rats with hyperhomocysteinemia. Thirty male SD rats (200 +/- 20 g) were invided into 3 groups (n = 10 for each group): control group(Control), high Met group(Met) and Met plus Folate group(Met + Folate), fed. for 45 days. Plasma Hcy levels were higher with the high-methionine diet (140.68 +/- 36.87 micromol/L vs 6.47 +/- 1.10 micromol/L in control rats) an effect which was reduced by folate. Respectively, the aortic expression of adhesion molecules VCAM-1 at protein and mRNA levels were higher in the Met groups than those in the control groups or the Met + Folate groups. A high methionine diet for 45 days was sufficient to induce hyperhomocysteinemia. Folate supplementation prevented elevation of Hcy levels in the blood, and reduced expression of the adhesion molecule VCAM-1. Hyperhomocysteinemia is now regarded as one of the important risk factors for cardiovascular and cerebralvascular disorders.[Welch GN, Loscalzo J. Homocysteine and atherothrombosis. N Engl J Med 1998; 38(15):1042-50.] Several plausible mechanisms for Hcy-induecd atherosclerosis have been proposed. These include endothelial dysfunction, enhancement of oxidative stress, reduction in NO bioavailability, and augmentation of thrombus formation.[Holven KB, Holm T, Aukrust P, et al. Effect of folic acid treatment on endothelium-dependent vasodilation and nitric oxide-derived end products in hyperhomocysteinemic subjects . Am J Med 2001;110(7):536-42; Guba SC, Fonseca V, Fink LM. Hyperhomocysteinemia and thrombosis. Semin Thromb Hemost 1999;25(3):291-309.] However, the precise molecular mechanism is still unclear. Recent reports have suggested a role for inflammatory processes in the pathogenesis of atherosclerosis.[Gerard C, Rollins BJ. Chemokines and disease. Nat Immunol 2001;2(2):108-15.] Dysfunction of endothelial cells is the key process promoting inflammatory reactions. On injury, endothlial cells are capable of producing various cytokines that participate in inflammatory reactions in the arterial wall. Although results from in vitro studies suggest that Hcy, at pathophysiological concentrations, stimulates chemokine expression in vascular cells, it is unknown whether hyperhomocysteinemia can initiate similar changes, leading to enhanced momocyte adhesion/binding to the vascular endothelium in vivo.[Zeng X, Dai J, Remick DG, Wang X. Homocysteine mediated expression and secretion of monocyte chemoattractant protein-1 and interleukin-8 in human monocytes. Circ Res 2003;93(4):311-20.] On the basis of the potential pathogenic role of chemokines in atherogenesis, the objective of the present study was to investigate that homocsteine may exert its effect in part though adhesion molecules VCAM-1 and that folic acid supplementation may downregulate these inflammatory responses. Male Sprague-Dawley rats (bred from animal centers of Tongji Medical College, Huazhong Science and Technology University) aged 8 weeks were divided into 3 groups(n=10 for each group) and maintained for 45 days on the following diets before the experiments: (1) regular diet; (2) high-metheionine diet, consisting of regular diet plus 1.7% methionine; and (3) high-methionine plus folate -rich diet, consisting of regular diet plus 1.7% methionine and 0.006% folate.[Boisvert WA, Curtiss LK, Terkeltaub RA. Interleukin-8 and its receptor CXCR2 in atherosclerosis. Immunol Res 2000;21(2-3):129-d37.] Plasma and serum samples wee colleced and stored at -80 degrees C after 45 days until analysis. The plasma homocysteine concentration of rats in three groups were determined by high-pressue liquid chromatography. To detect the endothelial expression of adhesion molecules VCAM-1, the thoracic aorta was isolated and dived into segments. These segments were immersion-fixed in 10% neutral-buffered formalin overlight and then embedded in paraffin. Sequential 5 mum paraffin-embedded cross sections were prepared. Immunohistochemical analyisis was performed to detect vascular cell adhesion molecule(VCAM)-1, The fixed cryosections were immediately blcked in 10% horse serum and phosphate baffered saline(PBS) at room temperature for 30 min. Goat polyclonal andibodies against rat VCAM-1(Santa Cruz Biotechnology) were diluted 1:100 in PBS and incubated with the cryosections for 1 h of room temperature. After three washes, the sections were incubated with biotin-conjugated rabbit anti-goat immunoglobulins(Dako) at 1:250 dilution in PBS. After three washes, the samples were mounted in 90% glycerol-PBS. Photographs were taken by use of a light microscope at a mignification of x200.
Ming Li, Jian Chen, Yu-Shu Li, Yi-Bai Feng, Xiang Gu, Chun-Zhi Shi

1337 related Products with: Folic acid reduces adhesion molecules VCAM-1 expession in aortic of rats with hyperhomocysteinemia.

1 G100ug Lyophilized100ug Lyophilized100ug100ug Lyophilized100ug Lyophilized 1 G100ug Lyophilized25 mg100ug Lyophilized100ug Lyophilized100ug Lyophilized

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#15713553   // To Up

Improved ELISA test for determination of potency of Inactivated Poliovirus Vaccine (IPV).

An improved ELISA test for determination of potency of Inactivated Poliovirus Vaccine (IPV) is proposed. The method is based on the use of IgG purified from immune rabbit serum conjugated with biotin. Optimized and validated materials for the test can be stored for a long time in the form of ready-to-use kits. Optimization included selection of anti-poliovirus rabbit antibody batches with the best specificity to D-antigen as well as finding the most efficient parameters for all steps of ELISA protocol. The assay is based on direct ("sandwich") ELISA scheme, in which antigens are captured on ELISA plates coated with purified rabbit polyclonal D-antigen specific IgG raised against wild polioviruses of three serotypes. D-antigen specificity of the IgG was at least 10 times higher than to H-antigen (heat-inactivated virus). The presence of antigen was detected using biotin-conjugated IgG from the same source. Eight-point dose-response curves were obtained for each sample and the reference vaccine. The protocol ensured low background (less than 0.2 OD), linear response over the entire range of optical density measurements (up to 3.0 OD), and high precision of data (assay variability was about 3%). The quantitative results and the validity of the test were determined by two numerical approaches, linear regression and a new analysis procedure called the local interpolation method. For the first approach we also proposed a new method for testing of parallelism of regression lines. The ELISA protocol for all three types of poliovirus is based on standard off-the-shelf reagents, and is highly reproducible and reliable. An in-house Reference Reagent was formulated and calibrated against the International Reference for IPV.
Gennady Rezapkin, Eugenia Dragunsky, Konstantin Chumakov

2866 related Products with: Improved ELISA test for determination of potency of Inactivated Poliovirus Vaccine (IPV).

96 tests96 Tests/kitOne 96-Well Strip Micropl96 tests96 tests1 kit(96 Wells)250tests100 TESTS100tests96 Tests96 tests

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#15237938   // To Up

Synthesis of haptens and development of an immunoassay for the olive fruit fly pheromone.

An enzyme-linked immunosorbent assay (ELISA) for the olive fruit fly pheromone, Bactrocera oleae Gmelin, was developed. The assay uses polyclonal antibodies, raised in rabbits, against (+/-)-beta-[3-(1,7-dioxaspiro[5.5]undecane)]propionic acid, 2 (hapten I), conjugated to the KLH (keyhole limpet hemocyanin) by the carbodiimide method. A second hapten, (+/-)-delta-[3-(1,7-dioxaspiro[5.5]undecane)]butylamine, 3 (hapten II), after conjugation to a biotin moiety, was used for indirect immobilization onto ELISA microwells precoated with the glycoprotein avidin. The developed ELISA method measures the synthetic olive fruit fly pheromone in concentrations ranging between 0.08 and 10 microg/mL and shows great promise for practical applications for pheromone detection in environmental and biological samples. The results obtained strongly indicate that this technique, to our knowledge the first insect pheromone enzyme-linked immunosorbent assay so far reported, is a fast, sensitive, inexpensive, and highly convenient method for the analysis of a volatile and low molecular weight compound such as 1,7-dioxaspiro[5.5]undecane, 1.
Afroditi Neokosmidi, Valentine Ragoussis, Christos Zikos, Maria Paravatou-Petsotas, Evangelia Livaniou, Nikitas Ragoussis, Gregory Evangelatos

2943 related Products with: Synthesis of haptens and development of an immunoassay for the olive fruit fly pheromone.

100ul100ug Lyophilized200ul25 µg100ug25 mg1 mL1000 tests10 mg100ul100.00 ul

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#15020090   // To Up

Dual enhancement of triple immunofluorescence using two antibodies from the same species.

Triple immunofluorescence method with two mouse monoclonal antibodies and another rabbit polyclonal antibody was established with catalyzed reporter deposition (CARD) amplification on thick floating sections from the rat cerebellum. One of the monoclonal antibodies (anti-calbindin), diluted maximally, probed with anti-mouse IgG-horseradish peroxidase (HRP) and amplified with Cy5-conjugated tyramide, immunolabeled cerebellar Purkinje cells and their arborization. Subsequently, a rabbit polyclonal IgG (anti-glial fibrillary acidic protein (anti-GFAP)), probed with anti-rabbit IgG-HRP, amplified with biotin-tyramide and visualized with fluorescein-isothiocyanate (FITC)-streptavidin, immunolabeled Bergmann's glia. Another mouse monoclonal IgG (anti-SNAP25), probed with anti-mouse IgG-rhodamine without CARD amplification, selectively visualized synaptic sites, because the maximal dilution of the other monoclonal antibody (anti-calbindin) was below the detection threshold of this anti-mouse IgG-rhodamine. Separation of the two signals (calbindin and SNAP25), each detected through mouse monoclonal antibody, was then based on the difference of sensitivity either with or without CARD amplification. Triple immunofluorescence is possible when just one of the three primary antibodies is from different species. Intensification of two of the three signals provides further advantages to examine immunolocalization of multiple epitopes on histological sections.
Ayako Nakamura, Toshiki Uchihara

1826 related Products with: Dual enhancement of triple immunofluorescence using two antibodies from the same species.

50 ug Product tipe: Antib0.1 mg50 ug Product tipe: Antib50 ug Product tipe: Antib100 ug Product tipe: Anti100 ul Product tipe: Anti100 μg20 ug Product tipe: Antib1 ml100 100ul

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