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(A) Absorption spectra of the AuNPs generated in the presence of different concentrations of melamine (a–j: control, 1 × 10−10, 1 × 10−9, 1 × 10−8, 1 × 10−7, 1 × 10−6, 1 × 10−5, 1 × 10−4, 1 × 10−3, and 1 × 10−2 M); (B) plot of A600/A520 against the log of melamine concentrations (n = 5).
