Abstract
The long-term accumulation of pipecolic acid, as well as its disappearance following exogenous administration was studied in brain and other organs of the mouse. Mice were pulse-injected intraperitoneally or intravenously with 1μCi[3H]D,l-pipecolic acid (6.9 nmol/mouse=2.9 μg/kg). The total radioactivity retained in tissues was measured in brain, liver, and kidney, as well as in plasma during the period 1 min to 24 hr. TLC separation of DNP-derivatives was performed. Three features of the pattern of retention of pipecolic acid are most salient; first the rapid accumulation in brain, second the rapid secretion of this compound in the urine, and third the long-lasting steady levels of radioactivity maintained in brain.
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