The Mojonnier fat extraction flask is designed for the gravimetric determination of fat content in dairy products and various food matrice. relies on the principle of extracting fat from an alkaline-treated sample using a mixture of ethyl ether and petroleum ether.The unique geometry of the flask—characterized by a bulbous lower settling chamber and a wider upper extraction chamber—allows for the precise separation and decanting of the solvent layer containing the dissolved lipids from the underlying aqueous phase without disturbing the non-fat solids.
Mojonnier flask is found in the analysis of milk, cream, evaporated milk, and butter. According to the Standard Methods for the Examination of Dairy Products, the flask is essential for performing the official reference method for fat analysis.