Selective extraction of parsley seed oil (Petroselinum sativum) facilitates the isolation of myristiein (5‐allyl‐1‐methoxy‐2,3‐methylenedioxybenzene) and is also useful for the preparation of petroselinic acid from the triglycerides of this oil. Coriander seed oil (Coriandrum sativum) is also a satisfactory source for the isolation of petroselinic acid.

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Summary A procedure is described whereby the mixed fatty acids of pork liver lipid are fractionated into groups of acids to facilitate their analysis and isolation. The major acids of pork liver lipid were palmitic 22.9%, stearic 16.8%, oleic 38.5%, linoleic 5.0%, and arachidonic 4.4%. A number of other unsaturated fatty acids were detected in minor amounts, such as isomers of arachidonic, linoleic, and palmitoleic acids. A number of fatty acids of odd‐numbered chain length also were detected. The isolation of methyl arachidonate in a number of preparations of purity ranging from 87 to more than 99% is described. Yields ranged from 44% for the purest arachidonate to 93% for the less pure concentrates. Alkali‐isomerization analyses of methyl arachidonate from this source, by the 21% KOH‐glycol method, gave appreciably different absorptivities from those previously published. Various criteria for estimating purity of polyun‐saturated fatty acids are discussed in the light of results of the analysis of methyl arachidonate.