Abstract
The chemical and physical characteristics of a sample of oil expressed from California walnuts have been determined. With the exception of the iodine number, the characteristics are similar to those reported for European walnut oil. The unusually high iodine number (161.7) of this sample of oil is noteworthy; the usual limits by the Wijs method are given as 138 to 148. This oil was found to contain 89.7 per cent of unsaturated and 5.3 of saturated acids. Contrary to the repeated statements in the literature, walnut oil does not contain lauric acid and only a trace of myristic acid, which is in accordance with the saponification value (192 to 197) of the oil. The percentages of the fatty acids as glycerides are given below: The composition of this oil has been determined, with the following results: Glycerides of: Percent Oleic acid 17.6 Linolic acic 72.8 Linoleic acid 3.2 Myristic acid trace Palmitic acid 4.6 Stearic acid .9 Arachidic acid trace Unsaponifiable matter .5
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