Theoretical Calculated   concentration concentration Recovery PGA1 (µg/ml) (µg/ml) ± SD   0.35625 0.354 ± 0.017 99.37 0.7125 0.713 ± 0.010 100.07 1.425 1.426 ± 0.005 100.07 2.85 2.848 ± 0.029 99.93 4.275 4.271 ± 0.010 99.91 S.D = Standard Deviation

Table 4: % of recoveries for PGA1.