Special solvent extraction; u Bondapak C18; 20% B - curve 8 - 30 min to 80% B, A = 0.25 g Na2HPO4, 600 mL water, 400 mL methanol 1.7 g of TBAP, B = 0.25 g Na2HPO4, 250 mL H20, 750 mL methanol, 1.7 g TBAP; 1 mL/min; UV 546, 436; DL = 1.1 µg /sample; C/P DBA
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