[Comparative identification research on different extracts of Dai Medicine "Pokou" and its processed product by FTIR]

To study identification methods of different extracts of Dai Medicine "Pokou" (the rhizome of Homalomena gigantea Engl. ) and its processed product made by immersing it in water, and provide reference for identification of the drug in further researches and applications.

FTIR technique was used for identifying the features of different extracted parts of this crude drug and its processed product.

Compared with the crude drug, the petroleum ether-extracted parts of processed product turned out to have no obvious distinction in the FTIR. There was a large difference in the ethyl acetate-extracted parts, and the n-butanol-extracted parts also had certain discrepancy. A preliminary analysis was made on the chemical fundamentals which caused the changes in the FTIR before and after the drug's processing.

The results provide an infrared spectral identification method for the drug and its applications.