the amounts of added analyte were at the level of the target concentration
(0.1 lg/ml) of our method. Hippophae rhamnoides samples
were spiked at three concentration levels, the first at the limit of
quantification (LOQ), the second in the target concentration
(0.1 lg/ml) and the third at the upper limit of our linear range
(0.3 lg/ml). The following equation was used for the estimation
of recovery from spiked samples