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A novel and sensitive colorimetric method for assay of Escherichia coli O157:H7 was developed as a model for Gram-negative bacteria by a mercaptoethylamine-modified gold nanoparticles (MEA-AuNPs) sensor. Mercaptoethylamine (MEA) molecule binded with E. coli O157:H7 via electrostatic adhesion between the positive electricity of MEA and the negative electricity of E. coli O157:H7. Furthermore MEA can...
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