Search results for: Elisa kits
#28315864 2017/03/19 Save this To Up
Vitamin D Status, Gender Differences, and Cardiometabolic Health Disparities.Vitamin D deficiency is an unrecognized epidemic found in India and also worldwide. Despite the high prevalence of diabetes among Indians, there is a paucity of data showing the relationship between vitamin D status and cardiometabolic disparities. In this study, we have examined the relationship between vitamin D and cardiometabolic traits in a population from India.
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#28304196 2017/03/17 Save this To Up
A Limited Survey of Dark Chocolate Bars Obtained in the United States for Undeclared Milk and Peanut Allergens.Undeclared allergens in chocolate products have been responsible for numerous allergen-related recalls in the United States. A survey was conducted to determine the prevalence of undeclared milk and peanut in 88 and 78 dark chocolate bars, respectively. Concentrations of milk (as nonfat dry milk) or peanut in three samples of each chocolate product were determined with two milk- or peanut-specific enzyme-linked immunosorbent assay kits. In 75% of the chocolate bar products with a milk advisory statement, milk concentrations were above the limit of quantitation (2.5 μg/g [ppm]), with the majority having concentrations >1,000 ppm. An additional 67% of chocolate bars with a "traces of milk" statement contained 3 to 6,700 ppm of milk. Fifteen percent of chocolates labeled dairy free or lactose free and 25% labeled vegan were positive for milk, all with concentrations >1,000 ppm. Even for chocolates with no reference to milk on the label, 33% of these products contained 60 to 3,400 ppm of milk. The survey of chocolate products for peanuts revealed that 8% of products with an advisory statement contained peanut, with the highest concentration of 550 ppm. All nine chocolates bearing the peanut-free or allergen-free statement were negative for peanut, but 17% of chocolates with no label statement for peanut were positive for peanut at concentrations of 9 to 170 ppm. Evaluation of multiple lots of four chocolate products revealed that milk was consistently present or absent for the products investigated, but mixed results were obtained when multiple lots were tested for peanut. This study indicates that a large proportion of dark chocolate bars contain undeclared milk. The type of advisory statement or the absence of a milk advisory statement on products did not predict the amount or absence of milk protein. In contrast, a lower proportion of chocolates containing undeclared peanut was found. Consumers with food allergies should be cautious when purchasing dark chocolate products, particularly those that have an advisory label statement.
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#28300559 2017/03/16 Save this To Up
Expression, purification and in vitro refolding of the recombinant truncated Saposin like protein 2 antigen for development of diagnosis of human fascioliasis.Early diagnosis of fascioliasis is critical in prevention of injury to the liver and bile ducts. Saposin-like protein (FhSAP-2) is probably the most ideal antigen of Fasciola hepatica for development of ELISA kits. SAP-2 has a conserved tertiary structure containing three disulfide bonds and conformational epitopes. Therefore, antigenicity of SAP-2 is greatly depends on disulfide bond formation and proper folding. We produced the recombinant truncated SAP-2 (rtSAP-2) in the SHuffle® T7 and Rosetta strain of E. coli, in soluble and insoluble forms, respectively and purified by immobilized metal affinity chromatography (IMAC). The refolding process of denatured rtSAP-2 was performed using dialysis and dilution methods in the presence of chemical additives, along with reduced/oxidized glutathione (in-vitro). Physicochemical studies, including non-reducing gel electrophoresis, Ellman's assay, western blotting and ELISA showed the most antigenicity and likely correct folding of rtSAP-2, which was obtained by dialysis method. An IgG ELISA test was developed using rtSAP-2 refolded by dialysis and compared with excretory/secretory products of parasite with 52 positive fascioliasis samples, 79 other parasitic samples and 70 negative controls samples. The results exhibited 100% sensitivity and 98% specificity for rtSAP-2, also, 100% and 95.3% for excretory/secretory (E/S) antigen, respectively. In conclusion, it is suggested that rtSAP-2 with the correct folding could be used as a candidate antigen for detection of human fascioliasis.
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#28292365 2017/03/15 Save this To Up
Serum Neopterin: A Potential Marker for Screening Blood Donors.To determine serum neopterin levels in blood donors of local population and its association with transfusion transmitted infections.
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#28290527 2017/03/14 Save this To Up
In situ self-assembly of gold nanoparticles on hydrophilic and hydrophobic substrates for influenza virus-sensing platform.Nanomaterials without chemical linkers or physical interactions that reside on a two-dimensional surface are attractive because of their electronic, optical and catalytic properties. An in situ method has been developed to fabricate gold nanoparticle (Au NP) films on different substrates, regardless of whether they are hydrophilic or hydrophobic surfaces, including glass, 96-well polystyrene plates, and polydimethylsiloxane (PDMS). A mixture of sodium formate (HCOONa) and chloroauric acid (HAuCl4) solution was used to prepare Au NP films at room temperature. An experimental study of the mechanism revealed that film formation is dependent on surface wettability and inter particle attraction. The as-fabricated Au NP films were further applied to the colorimetric detection of influenza virus. The response to the commercial target, New Caledonia/H1N1/1999 influenza virus, was linear in the range from 10 pg/ml to 10 μg/ml and limit of detection was 50.5 pg/ml. In the presence of clinically isolated influenza A virus (H3N2), the optical density of developed color was dependent on the virus concentration (10-50,000 PFU/ml). The limit of detection of this study was 24.3 PFU/ml, a limit 116 times lower than that of conventional ELISA (2824.3 PFU/ml). The sensitivity was also 500 times greater than that of commercial immunochromatography kits.
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#28288476 2017/03/13 Save this To Up
The Role of Rho/Rho-Kinase Pathway in the Pathogenesis of Cholesteatoma.To assess the role of Rho/Rho-kinase pathway in the pathogenesis of cholesteatoma.
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#28283396 2017/03/11 Save this To Up
Biochemical relationships between bone turnover markers and blood glucose in patients with type 2 diabetes mellitus.Patients with type 2 diabetes mellitus develop many complications including osteopenia, which is associated with high fracture risk. Osteocalcin is a non collagenous protein derived from the osteoblasts. Recently, it was found that osteocalcin enhances the pancreatic beta cell proliferation, insulin secretion and protection against type 2 diabetes.
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#28274669 2017/03/09 Save this To Up
Response to: Comparison of infliximab drug measurement across three commercially available ELISA kits.
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#28274667 2017/03/09 Save this To Up
Response to: Comparison of infliximab drug measurement across three commercially available ELISA kits: author reply.
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#28274440 2017/03/09 Save this To Up
Development of sandwich ELISA for testing bovine β-lactoglobulin allergenic residues by specific polyclonal antibody against human IgE binding epitopes.Bovine β-lactoglobulin (BLG) is the main allergen in cows' milk, and the most commonly used method for detecting BLG is enzyme-linked immunosorbent assay (ELISA). However, antibodies used in commercial ELISA kits do not recognize specifically BLG IgE epitopes. Here, an antibody specific to IgE linear epitopes for BLG was used to develop a sandwich ELISA using a rabbit anti-BLG polyclonal antibody. The linear range for BLG detection was 31.25-8000ng/mL and limit of detection was 1.96ng/mL. BLG content in dairy samples was determined, and there was a good agreement between this immunoassay and reversed-phase high-performance liquid chromatography with high recovery. Additionally, BLG content in food samples had an average recovery of 104.25%. Allergenic residues were also detected in hydrolyzed infant formulas. The method developed could be a practical approach to determine BLG and its allergenic residues in food with a high degree of sensitivity, reliability and recovery.
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