DEF – The whole of the constituents, soluble in fatty matter and insoluble in water, which cannot be modified by a saponification reaction producing a salt.
OBS – In practice, and for analytical determination: the whole of the products present in the substance analyzed which, after saponification of the latter with an alkaline hydroxide and extraction by a specified solvent, remains non-volatile under the defined conditions of test.

OBS – unsaponifiable matter : term and definition standardized by ISO

Termium


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Note added at 2002-09-12 16:53:41 (GMT)
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\"Animal Fat is obtained from the tissues of mammals and/or poultry in the commercial processes of rendering or extracting. It consists predominantly of glyceride esters of fatty acids and contains no additions of free fatty acids or other materials obtained from fats. It must contain, and be guaranteed for, not less than 90% total fatty acids, not more than 2.5% unsaponifiable matter, and not more than 1% insoluble impurities. \"
http://personal.cobleskill.edu/tischda/feeds/fat_pork.htm