A simple method for extraction and quantitation of 14-C-labeled compounds from blood.

IJABELEI) URIC ACTI) (as a 0.50 c./ml. solution in dilute fornmalin) and glucose (as a 5.0 .tc./ml. solution in saturated henzoic acid) were used. Tlmese were diluted with distilled water, and 0.20-mi. aliquots were placed in the bottom of 25-mm. test tui)es om25-nil. Erlenmeyer flasks and evaporated to dryimess. Dilutions were calculated to keep counting rates between 4000 and 2 ,000 cprn. As previously described (1-4), 0.i0-nmi. aliquots of sei-unm (micro