Quantification of Rutin, Quercitrin and Quercetin in Cosmos Caudatus Kunth by RP-HPLC

摘要

Cosmos caudatus is a traditional medicinal plant from the family Compositae. It is known in Malaysia as Ulam Raja whichmeans the king’s salad. The fresh leaves are consumed as appetizer for health benefits for various ailments such as to improveblood circulation and to promote the formation of healthy bones. This study aims to develop a reverse phase HPLC method forquantification of rutin, quercitrin and quercetin as the marker compounds in fifteen different Cosmos caudatus extracts. The methodwas validated for selectivity, linearity, precision, accuracy and limits of detection and quantification. Selectivity was confirmedbased on retention time and UV-Vis spectra; linearity was in the range 0.5-500 μg/ml at R2=1.0; the intraday and interdayprecision was determined as the relative standard deviation of peak area and retention time, and was found to be 0.3±0.07% and0.02±0.004%, respectively; percentage recovery of rutin, quercitrin and quercetin was in the range (91.63±3.1)%–(95.93±3.0)%, (80.41±1.5)%–(93.99±5.0)%, and (92.84±3.1)%–(98.05±2.6)%; the limits of detection were in the range 0.048-0.052 μg/ml, 0.144-0.157 μg/ml, 0.078-0.079 μg/ml, and the limits of quantification were 0.235-0.236 μg/ml, 0.152-0.164μg/ml, and 0.461-0.497 μg/ml, respectively. Results showed Cosmos caudatus contains high concentration of flavonoids andflavonoid glycosides including rutin, quercitrin, iso-quercitrin and quercetin and quercitrin being the major constituent in this plant.Hence it may be used as a reference compound for standardization of this medicinal herb. In conclusion, the method developed canbe used for quantitative analysis in quality control, stability studies, pharmacokinetics, and standardization purpose.