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Journal of Lipid Research, Vol. 14, 406-414, July 1973
Copyright © 1973 by Lipid Research, Inc.

2,3-erythro-Dihydroxyhexacosanoic acid and homologs: isolation from yeast cerebrin phosphate and determination of their structures

Motonori Hoshi ¹, Yasuo Kishimoto ², and Charles Hignite ²

¹ Eunice K. Shriver Center for Mental Retardation, Waltham, Massachusetts 02154; Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts 02114; and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
² Eunice K. Shriver Center for Mental Retardation, Waltham, Massachusetts 02154; Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts 02114; and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachsetts 02139

Homologs of methyl esters of very polar fatty acids were obtained by methanolysis of cerebrin phosphate isolated from baker's yeast. The major ester component was isolated by preparative gas-liquid chromatography and was found to be 2,3-dihydroxyhexacosanoic acid as deduced from the mass spectra of its trimethylsilyl ether and isopropylidene derivative, reaction with periodate, and comparison of its chromatographic behavior with that of synthetic erythro- and threo-dihydroxy acids. Its infrared spectrum supported the above conclusions. From their retention times by gas-liquid chromatography, the homologs were found to be saturated, unbranched 2,3-dihydroxy fatty acids with 24-27 carbon atoms. The synthesis of the new fatty acids, erythro- and threo-2,3-dihydroxyhexacosanoic acids, is also reported. A method for separating trans-2-hexacosenoic acid, a key intermediate of the above synthesis, and its isomer, trans-3-hexacosenoic acid, both formed by dehydrobromination of 2-bromohexacosanoic acid, is also described.

Supplementary key words gas-liquid chromatography • thin-layer chromatography • mass spectrometry • 2-hydroxy fatty acids • phytosphingosine • synthesis of 2,3-dihydroxyhexacosanoic acid • 3,4-dihydroxyhexacosanoic acid • 13,14-dihydroxydocosanoic acid • 2-hexadecenoic acid • 3-hexadecenoic acid

Submitted on November 21, 1972
Accepted on February 15, 1973

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