Abstract
Δ′-Pyrroline, an oxidative product of putrescine metabolism, was chemically synthesized and incubated with a rat liver homogenate. The incubation mixture was fractionated on an amino acid analyzer before and after acid hydrolysis. The hydrolyzed sample, in contrast to the unhydrolyzed sample, contained a ninhydrin positive compound that cochromatographed with γ-aminobutyric acid, the product of 2-pyrrolidone acid hydrolysis. Authentic 2-pyrrolidone had the same retention time as the Δ′-pyrroline metabolite when analyzed by high-pressure liquid chromatography. It is concluded that Δ′-pyrroline is an intermediary metabolite in the pathway from putrescine to 5-hydroxy-2-pyrrolidone.
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