Abstract
[U- 14C]Phytol (3,7,11,15-tetramethylhexadec-2-en-1-ol) and [U- 14C]dihydrophytol (3,7,11,15-tetramethylhexadecanol) were administered intracerebrally to 18-day-old rats and incorporation of radioactivity into brain lipids was determined after 6 and 24 h. Radioactivity from [U- 14C]phytol was found in free phytenic (3,7,11,15-tetramethylhexadec-2-enoic), phytanic (3,7,11,15-tetramethylhexadecanoic) and pristanic (2,6,10,14-tetramethylpentadecanoic) acids, in phytanic and pristanic acid moieties of neutral and polar lipids, and in esters of phytol. In addition, evidence is presented for the utilization of phytol to form 1- O-phytenyl-2-acyl glycerophosphatides. Radioactivity from [U- 14C]dihydrophytol was found in free phytanic and pristanic acids, the corresponding acyl groups of neutral and polar lipids, esters of dihydrophytol and 1- O-phytanyl-2-acyl glycerophosphatides. Incorporation of either substrate into O-alkylglycerols was very low, and labeled branched-chain alk-1-enylglycerols could not be detected.
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