Figure 1.

Chromatogram of the LLOQ standard (0.10 μg L−1) of tacrolimus with the internal standard 13C2H4‐tacrolimus. The retention time and peak‐area are given on top of the peak

Chromatogram of the LLOQ standard (0.10 μg L−1) of tacrolimus with the internal standard 13C2H4‐tacrolimus. The retention time and peak‐area are given on top of the peak