Stability study of puerarin
Puerarin is the dominant isoflavone of leguminous plants Pueraria lobata(wild). As a kind of estrogen, it can improve blood circulation, strengthen the organic immunity. There are few literatures about the stability study of puerarin, this paper studied the influence of pH, temperature, metal ion, H2O2, Na2SO3 and extraction solvents on the stability of puerarin. Results showed that temperature, Cu2+ and Na2SO3 had major impact on the stability of puerarin; With the increase of storage temperature and duration, puerarin content decreased significantly; Cu2+ affect the UV absorption spectra of puerarin; Na2SO3 made the maximum UV absorption wavelength of puerarin shifted, and with the increase of Na2SO3 concentration, the absorbance values increased.