Aptamer-functionalized AuNPs for the high-sensitivity colorimetric detection of melamine in milk samples - Fig 5

<p>UV-Vis absorption spectra of aptamer-AuNPs solution obtained from different concentrations of melamine samples in aqueous solutions (Fig 5A) and milk samples (Fig 5C), sensitivity of this colorimetric assay system for melamine detection in aqueous solutions (Fig 5B) and in milk solution (Fig 5D), respectively. The concentrations of melamine are 0, 0.1, 0.2, 0.5, 1.0 and 2.0 μM.