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FTIR spectra characterization of three kinds of QD fluorescence biological probes [(A) FTIR spectra of green fluorescent QD biological probes before and after coupling with E. coliO157:H7-aptamer; (B) FTIR spectra of red fluorescent QD biological probes before and after coupling with S. aureus-aptamer; and (C) FTIR spectra of blue fluorescent QD biological probes before and after coupling with V. parahaemolyticus-aptamer].
