Pure ibuprofen powder (160 mg) was weighed into a 100 mL
volumetric flask containing about 70 mL of HPLC grade
methanol and sonicated for 20 min. The resultant solution was
allowed to settle and made up to volume. A 5 mL aliquot of the
solution was diluted to 100 mL to get a concentration of 80 mg/
mL. The standard solution was run on the HPLC. Six injections
were run for the standard to determine the system suitability and
were calibrated to see the correlations and relative standard
deviation