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Internal quality control was performed by regular analyzes of stored plasma aliquots, and was satisfactory during the assay period.
Stringent internal quality control procedures were adopted to identify and quantify PCBs congeners in both packaging and food.
For Quality Control purposes a reference sample with known concentrations of dioxins congeners was included in the batches of samples analyzed.
customer service would be quality control.
The advantage of a standardized extract is that the quality control is more assured than for most preparations of the raw herb.