3.5. Limits of detection (LOD) and quantification (LOQ)
The LOD is defined as the lowest active substance concentration
which can be determined by the method, however
not calculated precise and accurately. LOQ is the concentration
of the sample in analysis that is obtained with adequate
precision and accuracy [23,25,26]. An estimation of the limits
can be achieved by the determination of the signal/noise
ratios of 3:1 (LOD) and 10:1 (LOQ). For this HPLC stabilityindicating
method, the LOD and LOQ values were found to
≈0.05 and ≈0.17gmL−1, respectively. Table 2 summarized
the experimental data for the HPLC stability-indicating method
parameters.