Formaldehyde @ 1.0–1.2 g per 100 g of cake protein is sprayed on cake in a closed chamber • Sealed in plastic bags for 4 days • Formalin gets adsorbed on the cake particles • Reversible and pH dependent protection of proteins against proteolytic enzymes • In the acidic pH (abomasum), bonds are loosened • Proteins ~ free for digestion 16 Method of Protein Protection