Nagaraju et al
Der Chemica Sinica, 2017, 8(1):175-183
Pelagia Research Library
179
of analytical results; it is an integral part of any good analytical practice.
The potentiometric titration method was developed and validated according to International Conference on
Harmonization (ICH) guidelines for validation of analytical procedures [9]. The method was validated for the
parameters like Linearity, accuracy, system
precision, Intra-day precision, Inter-day precision, intermediate precision/
Ruggedness, Robustness, Limit of detection (LOD) and Limit of quantitation (LOQ).
Specificity
Specificity is the ability of the method to measure the analyte response in the presence
of all impurities related
to drug substance, for specificity determination checking the
interference of Blank, EDTA [9-11] spiked to drug
substance at known concentration level and all known related substances of drug substance including EDTA [12-14]
with known concentration level were prepared and analysed and Perform the EDTA Content
the percentage difference
between EDTA content in spiked individually and spiked with known related substance was determined. Calculate the
percentage difference between spiked and unspiked.
Linearity
Standard solutions of EDTA at different concentrations were prepared. Calibration curve was performed by plotting
the concentration level of EDTA (Ethylene di amine tetra acetic acid) versus corresponding volume of 0.01
M Copper
sulphate consumed in the titration. Accurately weighed 1.5211 g of EDTA.2Na (Which is equivalent to EDTA) in a
250 ml volumetric flask sonicate to dissolve and make up to the mark with water. To this take separately with micro
pipette 100 µl, 150 µl, 200 µl, 250 µl, 300 µl to all the solutions add 10 ml of PH:10 buffer add 60 ml water swirl well
to dissolve then titrate with 0.01 M Copper sulphate solution determine the end point potentiometrically note down the
volume as V1 (ml). Calibration curve was constructed by plotting the concentration of EDTA (in mg) versus
volume
of 0.01 M Copper sulphate solution. The result show an excellent correlation between volume of copper sulphate
consumed and concentration of EDTA with in the concentration range (w.r.t sample concentration 0.05% to 0.15%)
are given. The correlation coefficient was greater than 0.999, which meet the method validation acceptance criteria
and hence the method is said to be linear (
Table 1).
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