Calculation formula used
1. Calculation formula for % assay of Paracetamol
Mean Test Absorbance ilution of Standard Mean Test Weight
%Assay = ------------×------------×-----------×Potency of Standard
Mean Standard Absorbance Dilution of Sample Label Claim
2. Relative standard deviation
Standard deviation of Measurements
%RSD = -------------------------
--------------------------------×100
Mean value of Measurements
3. Recovery
Amount Found
%Recovery = ---------------------×100
Amount Added
4. Amount Found
Mean Test Absorbance
Amount Found (mg/ml) = ----------------------×Standard Concentration
Mean Standard Absorbance
5. Amount Added
Weight
Amount Added (mg/ml) = -----------
Volume
6. Limit Calculation for Stability of Analytical Solution Study:
Absorbance of Standard Initial–Absorbance of Standard (at different time)
Limit = ------------------------------------------------------------×100
Absorbance of Standard Initial