3.3.5. Range
Range of a method is defined as the lower and higher concentrations
for which the method has adequate accuracy, precision and linearity.
To demonstrate the range, six samples each of lower concentration
(80% of target level) and higher concentration (120% of target level)
were prepared similar to accuracy samples by spiking the drug
substance into blank matrix (placebo). Each sample was analyzed in
duplicate. At lower concentration, mean recovery of sodium hyaluronate
was found to be 99.42%. Relative standard deviation obtained
from these determinations was found to be 0.68% for sodium
hyaluronate. At higher concentration, mean recovery of sodium
hyaluronate was found to be 100.08%. Relative standard deviation
obtained at the higher concentration level was found to be 0.49%