at 100 ng/ml to 89±4.5% at 5 ng/ml, with CV values
ranging from a 5.1% at 5 ng/ml to 10.9% at 20 ng/ml
(Table 4). Recovery of internal standard 7-aminoactinomycin D (1.0g/ml) was 81.9±4.3% (mean±S.D.;
n=10). The stability data of extracted samples at
concentrations of 5, 20 and 100 ng/ml, showed no significant degradation, with