This paper was to develop a Raman spectra analytical method for the analysis of tetracycline hydrochloride. The surface enhanced Raman spectroscopy (SERS) were measured with the optical fiber nano-probe coated nanoparticles. Both the normal and the expired tetracycline hydrochloride were analyzed by the direct detection mode and remote detection mode. The results showed that the surface-enhanced Raman spectra could provide the chemical information for distinguishing the normal drugs from the expired ones. It demonstrated that the drug could be analyzed rapidly by SERS with optical fiber nano-probe.

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