NOVELTY - Making (M1) feedstock (24) for biodiesel fuel from an animal fat or oil, involves heating and maintaining the animal fat or oil in a reaction vessel (10) at 90-100degreesF; reacting and mixing a first polymer material with the animal fat or oil to coagulate the unsaponifiable portion within the reaction vessel; reacting and mixing a second polymer material with the coagulated reaction contents in the presence of a non-polar solvent (17) to flocculate the unsaponifiable portion (22) within the reaction vessel; and separating the unsaponifiable portion from the reaction vessel.    USE - For making (M1) feedstock for biodiesel fuel from an animal fat or oil, and removing proteins from an animal fat or oil stock (claimed). The feedstock is preferably refinable triglyceride or biodiesel fuel feedstock.    ADVANTAGE - The method to removes impurities and proteins from animal fats and oils to provide feedstock for biodiesel fuel which does not foul the diesel engine and provides biodiesel fuel which meets and exceeds the ultra low sulfur diesel fuel ASTM specifications. The method increases the length of the peptides or short chains proteins into buildable form which are removed by filtered media or spun-out of the solution using centrifuges. The method treat animal fats and oils by chemically reacting peptides and short chain proteins contained within the animal fats or oils to polymerize the short chains proteins or peptides into a larger, more filterable form which stabilize the resulting animal/oil against biological and physical degradation and which provide low sulfur diesel fuel feedstock.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for removing (M2) proteins from an animal fat or oil stock involving:    (1) reacting cross-linking material (0.01-10 wt.%) to cross-link the proteins in it;    (2) adding non-polar solvent and polar solvent to the animal fat or oil stock; and    (3) separating the resultant precipitated proteins from the animal fat or oil stock.    DESCRIPTION OF DRAWING(S) - The figure shows schematic for separation of unsaponifiable matter from animal fats and oil.    Reaction vessel (10)    Heat exchanger (12, 18)    Static mixer (14, 16)    Non-polar solvent (17)    Centrifuge (20)    Unsaponifiable matter (22)    Biodiesel feedstock. (24)