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(a, b) Digital SERS maps for an isotopologue mixture of ciprofloxacin. The colors are related to the detection of normal (blue) and isotopically substituted (red) ciprofloxacin. The two ciprofloxacin species were detected simultaneously in a single event (purple). (c) Analytical calibration curve from the digital SERS procedure. Adapted with permission from ref (440). Copyright 2018 American Chemical Society.
