2.8 Calculation
Limit of detection (LOD) was calculated by the formula LOD = F*SD/b where factor F =
3.3; SD, residual standard deviation of the regression curve and b is the slope of the regression
curve. For limit of quantification (LOQ) value, the formula LOQ = 10*SD/b was used
(International Conference on Harmonization (ICH) guidelines). Values below LOD are
considered not detectable (nd) and below LOQ as not significant (ns). In case of standards’
calculation contribution from blank starch matrix (including surrounding background) were
removed before regression analysis. Background correction was also done for unknown sample
calculation.