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[Objective]To determine the Zn content in FOLIUM NELUMBINIS,so as to provide scientific basis for the deep development and utilization of FOLIUM NELUMBINIS in pharmaceutical and food industries.[Method]Content of Zn in FOLIUM NELUMBINIS was determined by direct UV spectrophotometry using PAN as the color-developing agent and with standard zinc solution as control at the wavelength of 562 nm.[Result]Zn(Ⅱ) and PAN could form red complex,and the absorbance presented good linear relationship with concentration of standard zinc solution in the range of 0.48-5.03 μg/ml(r=0.999 9).The mean content of Zn in FOLIUM NELUMBINIS was 87.44 μg/g with average recovery of 99.8% and RSD value of 0.34%.[Conclusion]Simple in operation,accurate in determining result and good in repeatability and stability,the spectrophotometry established in this case can be used for determining the content of zinc in FOLIUM NELUMBINIS.
[Objective] To determine the Zn content in FOLIUM NELUMBINIS, so as to provide scientific basis for the deep development and utilization of FOLIUM NELUMBINIS in pharmaceutical and food industries. [Method] Content of Zn in FOLIUM NELUMBINIS was determined by direct UV spectrophotometry using PAN as the color-developing agent and with standard zinc solution as control at the wavelength of 562 nm. [Result] Zn (II) and PAN could form red complex, and the absorbance presented good linear relationship with concentration of standard zinc solution in the range of 0.48-5.03 μg / ml (r = 0.999 9). The mean content of Zn in FOLIUM NELUMBINIS was 87.44 μg / g with an average recovery of 99.8% and RSD value of 0.34%. [Conclusion] Simple in operation, accurate in determining result and good in repeatability and stability, the spectrophotometry established in this case can be used for determining the content of zinc in FOLIUM NELUMBINIS.