1 sample from the upper, middle and lower layers of freshly prepared QC samples with low and high concentrations, respectively, with 3 samples for each concentration, can be used as samples for immediate homogeneity analysis, and can also be used for investigating accuracy and precision. Samples can be temporarily stored at room temperature without light before analysis. The sampling volume can be adjusted according to the experimental needs, and the uniformity analysis needs to be completed on the same day.
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