title: Protein quantitation of as low as 10-ng/ml concentrations by competitive binding to polystyrene latexes.
abstract: A protein quantitation method which offers protein detection as low as 10 ng protein/ml and accurate quantitation as low as 30-100 ng protein/ml, depending on the protein, has been designed. The assay, which is relatively quick and simple to perform, utilizes the strong, nonspecific adsorption of proteins onto polystyrene latexes. A competition is created between a marker enzyme and the analyte protein for a limited amount of latex surface area. Due to inactivation of the enzyme upon binding to a hydrophobic latex surface, measurement of enzyme activity allows determination of the bound/free enzyme ratio and thus the competing protein concentration. Considerations of sensitivity and simplicity are suggested to make this assay superior to others presently available.
mesh_terms: D000469:Alkaline Phosphatase / Q000032:analysis; D001667:Binding, Competitive; D055598:Chemical Phenomena; D002621:Chemistry; D006863:Hydrogen-Ion Concentration; D008832:Microchemistry; D009994:Osmolar Concentration; D011137:Polystyrenes; D011485:Protein Binding; D011506:Proteins / Q000032:analysis*
chemical_list: D011137:Polystyrenes; D011506:Proteins; D000469:Alkaline Phosphatase