Crismer value

The Crismer value (CV) measures the miscibility of an oil in a standard solvent mixture, composed of /-amyl alcohol, ethyl alcohol, and water in volume proportion 5 5 0.27 (Table 4.13). This parameter was a specification criterion used for international trade, mostly in Europe. However, it is rarely used today. Values are generally characteristic, within a narrow limit, for each kind of oil. The miscibility of oil is related to the solubility of the glycerol esters and is affected mainly by the unsaturation and chain length of the constituent fatty acids. 

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The solubility of rapeseed oil in various solvents, viewed as turbidity on cooling, has been used to distinguish HEAR oils from other common vegetable oils, chiefly as the Crismer value (AOCS method Cb 4-35). A regression line has been developed for LEAR oils and HEAR oils with up to 25% of 22 1 (Sahasrabudhe, 1977). An alternative and simpler solvent system has been proposed by McGregor (1977), and is probably more useful at low (0.5-5%)... 

Crismer value Unsaponifiable matter Brassicasterol Erucic acid... 

Determination of Crismer value /J According to the AOCS method (Official and Tentative Methods of the American Oil Chemists Society AOCS Official Method Cb 4-35, Crismer Test, Fryer and Weston Modification, and Ca 5a-40, Free Fatty Acids, calculating the acidity as oleic acid). Results are expressed by a conventional value (y as described in the method. 

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