Abstract
The present authors have prepared a petroleum ether soluble acidic fraction from methanolic extracts of the sarcocarps of the date palm. A portion of this fraction was directly applied to the gas chromatograph and palmitic, capric, caprylic, linoleic, lauric, pelargonic, myristic, dodecenoic, stearic, linolenic, margaric, pentadecanoic and oleic or elaidic acids were clearly identified. Enenthic, n- and isobutyric, n- and isovaleric, n- and isocaproic and propionic acids were hardly recognized. A gas chromatogram of the methyl esters, derived from another portion of the above fraction, quite agreed with that of the free fatty acids. Some of lower fatty acid esters(<C5) seemed to be lost during the methylation and subsequent evaporation processes owing to their higher vapor pressures. Palmitic acid, major component of the sample, was isolated from the condensate as a crystalline mass. This substance was identified by infra-red spectroscopy and gas chromatography. One of the reference compounds, trans-dodecenoic acid, was synthesized from 1-decen-3-ol via diethyl dodecenyl malonate.
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