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Colorimetric detection of melamine in milk by using gold nanoparticles-based LSPR via optical fibers

Fig 2

(a) Mechanism of the colorimetric detection of melamine based on the unmodified AuNPs; (b) UV-Visible absorption spectra of AuNPs (blank), AuNPs+0.5μM melamine and AuNPs+2μM melamine.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0177131.g002