The invention discloses a conjugated
polymer and a method for synthesizing the conjugated
polymer. The detection method is as follows: (1) adding an
aqueous solution of a conjugated
polymer and a nanosilver solution to a
buffer solution, stirring and reacting, standing, and measuring the
fluorescence intensity; (2) adding a solution containing the etimicin to be tested, stirring and reacting, standing, and measuring the
fluorescence intensity or
absorbance; and (3) calculating the
molar concentration of etimicin. The conjugated polymer of the invention can be adsorbed on the surface of the
silver nanoparticle in a non-covalent manner to realize
fluorescence and colorimetric detection; and is also well soluble in water and an
organic solvent. The synthesis method provided by the inventionis simple in operation, low in cost and suitable for the industrial production. The detection method provided by the invention combines the conjugated polymer with the
silver nano particles to form anew nano-composite
system, which obviously improves the sensitivity of the detection for etimicin, is simple and easy, and has accurate detection, rapidness, sensitivity, good detection linear and good selectivity.