Terahertz Spectra Study of Quercetin and Quercitrin from Ecdysantherarosea

In view of the potential application of terahertz technology in the identification and structure identification of organic small molecule compounds, the absorption spectra of the extract of Edysanthera rosea Hook.et Arn in terahertz band were analyzed by terahertz time-domain spectroscopy (THz-TDS). The spectral characteristics and absorption peaks of quercetin and quercitrin in $0.8 \sim 1.25$THz band were obtained. The two compounds have the same absorption peaks at 1.10 and 1.16 THz, and they also have significantly different characteristic absorption peaks, which reflects the fingerprint characteristics of terahertz for small molecular compounds.