Determination of SO2 in food, especially grain. By adding hydrochloric acid, the SO2 is moved out of the sample and absorbed in the behrotest absorption vessel perhydrole (H2O2). H2O2 is boiled and the solution titrated.
Function: The determination takes place through azeotropic distillation. For this, various sample materials xylene or toluene is added. In the vaporous phases the solvent binds with the water and after condensation, the water is separated from the solvent in a measuring tube.
Determining the hydroxyproline content of meat, meat products and sausage products in accordance with Sec. 64 LFGB (German Food & Feed Act). In this process, a sample is subject to acid hydrolysis. Acid hydrolysis can either be completed through a classic process with a behrotest RH 6 digestion apparatus or with a modern behrotest HDP 6/12 digestion apparatus. Then the oxidized hydroxyproline is measured photometrically at 558 nm.
The method for the determination of saponification value in animal and vegetable fats and oils is effected in accordance with DIN EN ISO 3657. With an excess of ethanolic potassium hydroxide solution the tested sample is saponified by boiling under reflux and later titrated with standard hydrochloric acid solution until reaching the end point.