00 mL/min (Fig. 2A). The use of PDA

detector allows optimum utilization of online UV spectra to assess peak purity. The peaks recorded with a retention time in all the chromatograms of eugenol from ayurvedic formulations resulted to be within the peak purity limits. These data excludes the presence of significant interference by other plant constituents. A good linearity was successfully achieved in the concentration range of 50.00 ng/mL to 50,000.00 ng/mL. The regression equation and correlation coefficient was found to y = 96149x − 14341 and R2 = 0.996. The relative retention time (RRT) and relative peak area (RPA) of each characteristic from samples related to the reference peak was calculated for quantifying eugenol from ayurvedic formulations: Caturjata Churna, Lavangadi Vati, Jatiphaladi Churna, Sitopaladi Churna and clove oil. The concentration (mg/gm) and % CV are shown below in Table 1. The LOD and LOQ were determined OSI-744 chemical structure from both the values of calibration curve and with signal to noise ratios of 3 and 10 respectively. The LOD and LOQ were found to be 25.00 ng/mL and 50.00 ng/mL. The acceptance criterion for system suitability is ±2% for the PFT�� order per cent coefficient of the variation of the peak area and retention time of the drug. The values are depicted in Table 2 which indicated good performance of the system. The precision and accuracy % RSD values for recovery at each level was not more

than ±0.2% for Ketanserin accuracy and were within the acceptable limits to meet the guidelines for analytical method validation. The accuracy was determined by means of recovery of the added analytes at three different concentration (low, medium and high level) as well as S.D. of the assays. The results recorded for accuracy studies mean recovery values for all ayurvedic formulations were always higher

than 85% as indicated in Table 2. The % CV intraday and interday results were obtained in the values ranging between 0.33–1.21 and 1.08–1.58 individually. The mean assay result for intraday and interday precision was found to be 103.87% and 104.30% respectively. Since there was no impurity of peaks in the chromatograms, the values obtained indicate that solution is stable for at 24 days at ambient temperature. The accuracy of both the methods was good with the deviation between the nominal concentration and calculated concentration well below the limits of 15%. Thus, intraday and interday precision and accuracy data indicated that the method is validated, highly reproducible reliable and satisfactory. Stability of eugenol from Caturjata Churna, Lavangadi Vati, Jatiphaladi Churna, Sitopaladi Churna and Clove Oil for 12 h and 24 days was evaluated. The experimental conditions were deliberately altered for determining the robustness of the assay method and check the reliability of an analysis with respect to deliberate variations in method parameters.