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Caption : figure s1. extinction spectra of aunps and sers nanotags of (a) slpa and (b) toxb.

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Caption : figure s2. average results of (a) dls measurements, and (b) zeta potential analysis (n=3) for aunps and sers nanotags of slpa and toxb. error bars indicate standard deviations from three measurements.

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Caption : figure s3. sem images for the prepared gold nanoparticles from different spots.

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Caption : figure s4. bar charts for the dynamic ranges of the calibration curves used for the quantification of (a) slpa and (b) toxb. error bars indicate standard deviations from three measurements. all the sers measurements were carried out using a handheld raman spectrometer equipped with a 638 nm laser excitation source at 5 mw laser power with an acquisition time of 0.5 s at ors mode.