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A new liquid piezoelectric immunoassay, termed as PEG piezoelectric immunoassay, has been proposed for the direct determination of transferrin in human serum. The method is based on the agglutination of antigen and antibody by immunoreaction with PEG as a promotor. The response mechanism of the method was investigated in detail. It was found that some immune agglutinates were adsorbed onto the crystal...
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