Cder guidance validating chromatographic methods
Now how can anyone be sure that each HPLC autosampler is injecting precisely or that the column has not degraded the day before?
Table 1 summarizes guidelines for setting SST limits from the FDAs Center for Drug Evaluation and Research (CDER) (2) and compares them with those proposed by Hsu and Chien (3), which include recommendations for biologics and trace components.
SSSs are analyzed before and interspersed between samples during testing (i.e., five replicate injections of SSS for initial SST and one SSS injection every 10 assay or 12 dissolution samples).
Primary SST parameters are resolution (R), repeatability (RSDrelative standard deviationsof peak response and retention time), column efficiency (N), and tailing factor (T).
According to the United States Pharmacopeia (USP) and the International Conference on Harmonization (ICH), SST is an integral part of many analytical procedures.
Although USP and ICH are not regulatory agencies, their guidelines are bibles followed closely in the industry because they are accepted by the FDA.
The optimized and applied chromatographic conditions permitted separation of polyhexanide from interacting matrix with subsequent detection at a wavelength of 235 nm with good sensitivity.