KjeldahlKjeldahl method is chemical analysis process to determine the nitrogen contents in a specific product. Used to estimate protein contents in food.
Randall/SoxhletSoxhlet method is used in lipidic compounds extraction in solids, using a suitable solvent.
WeendeWeende method is used to quantify fibre. Based on the residual extract obtained after an acid and alkaline hydrolysis.
Van SoestVan Soest method determines crude fibre by acid detergent (FAD), or by neutral detergent (FND), based on the non digestible obtained residue.