Estimation of hemicelluloses
Hemicellulose are non-cellulosic, non=pectic cell wall polysaccharides. They are regarded as being composed of xylans, mannans, glucomannans, galactans and arabinogalactans. Hemicelluloses are categorized under ‘unavailable carbohydrates’ since they are not split by the digestive enzymes of the human system.
Refluxing the sample material with neutral detergent solution removes the water-solubles and
Materials over than the fibrous component. The left out material is weighed after filtration and expressed as neutral detergent fiber (NDF).
» Neutral Detergent Solution
» Weigh 18.61g disodium ethylenediamine tetraacetate and 6.81g sodium borate decahydrate. Transfer to a beaker. Dissolve in about 200mL of distilled water by heating and to this, add a solution (about 100 to 200mL) containing 30g of sodium lauryl sulphate and 10mL of 2-ethoxy ethanol. To this add a solution (about 100mL) containing 4.5g of disodium hydrogen phosphate. Make up the volume to one liter and adjust the pH to 7.0.
» Sodium sulphite
Hemicellulose = Neutral detergent fiber (NDF) – Acid detergent fiber (ADF)
See Lignin for determining acid detergent fiber.
1. Goering, H D and Vansoest, P J (1975) Forage fiber analysis US Dept of Agriculture. Agricultural Research Service Washington.
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