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Nanoparticle aggregates induced by synergistic effect of electrostatic interaction and hydrogen-bonding recognition between melamine and 3-mercaptopriopionic acid (MA), which conjugated on the surface of gold nanoparticles (AuNPs) are used for detection of melamine. MA molecules are conjugated on AuNP surfaces to form MA-modified AuNPs (MA-AuNPs), acting as nanoprobes in the detection of melamine...