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1 ng g-1 level, depending on the matrix. Additional validation was performed by tandem mass spectrometry on a triple quadrupole instrument. This approach provided no non-detects and better recoveries at the 0.1 ng g-1 level than the HRMS method but exhibited more variability at 1 and 5 ng g-1 spiking levels. Analysis of NIST SRMs 1946 and 1947 gave accuracies of 70-117%. These results demonstrate the capability of combining PFAS analysis with a mega-method previously validated for 350 analytes, while collecting non-target data for fut