Theoretical Calculated   concentration concentration Recovery PGE1 (µg/ml) (µg/ml) ± SD   12 11.976 ± 0.081 99.8 13.5 13.495 ± 0.072 99.96 15 15.050 ± 0.092 100.33 16.5 16.531 ± 0.155 100.19 18 17.976 ± 0.086 99.86 S.D = Standard Deviation

Table 3: % of recoveries for PGE1.