3.9 Robustness
The robustness is a measure of its
capacity to remain unaffected by small, but
deliberate variations in method parameters
and provides an indication of its robustness
during normal usage. The robustness was
tested during the development phase by a
slightly vary of volume of injection (+ 5 μL),
wavelength (+ 2 nm), flow rate (+ 0.1 mL/
min), the percent of organic modifier (+
2% absolute) and pH of the mobile phase
(+ 0.2 pH unit). The robustness was
performed on a standard mixture solution
of benzoic acid and sorbic acid and the
result was evaluated by calculating the SST
(system suitability test) values. The SST
parameters kept on unaffected over
deliberate changes in the chromatographic
conditions (Table 5), illustrating that the
method was robust. Moreover, the noodle
samples were considered under different
parameters and it was observed that there
was no change in the area under the peak,
confirming the robustness of the method.