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The colorimetric detection of β-gal concentration using enzyme-induced metallization of gold nanorods. (a) UV-vis absorption spectra, (b) the blue shift in the longitudinal LSPR peak (insert: linear range, the solid and dash lines indicates the average and ± 3 standard deviation of Δλmax of control samples), and (c) photographs of multi-colorimetric assay toward various concentrations of β-gal.
