Crude fiber Estimation is a term used to describe the fibrous food residue that is left over after it has been dissolved in the laboratory with certain harsh chemical solvents such as sulfuric acid and sodium hydroxide. Crude fiber is determined by laboratory analysis and is mainly composed of lignin, which is found in the tissues of plants and cellulose. It is of hot plate type for 6 tests. Crude Fiber Estimation apparatus comes complete with 6 x 1000 ml. beakers, 6 bulb shape condensers, clamps and connecting rubber tube .
In crude fiber estimation the sample is allowed to boil with 1.25% dilute H2SO4, washed with water, further boiled with 1.25% dilute sodium hydroxide and the remaining residue after digestion was taken as crude fibre.
