3.3.3. Assessment of the homogeneity of the plate backgroundsThe homogeneity of the plate backgrounds obtained via thethree different media was referred to the densitometrically mea-sured LOD. The intra-day and inter-day precisions (%RSD) weredetermined (Table 1). The highest background fluctuation (up to57%) and the lowest S/N (down to 2.3) were obtained via the bioden-sitogram of the LB medium. This confirmed that the LB medium isnot as robust as the other broths and turned out not to be suited fordensitometric measurements due to the high standard deviationsand low detectability.