Cottonseeds phenol removing method
1 chemical method
Removing the gossypol in cottonseed meal with chemical method, mainly in the past to squeeze oil extraction of cotton pulp add sulfate, ferrous sulfate, copper sulfate), the metal ions and free gossypol in the meal form complex, achieve detoxification.But the complex formed by remains in cotton pulp, pulp nutritional value and palatability is poorer.
2. Biological fermentation
Adopt the method of microorganism fermentation converts the gossypol in cotton pulp into other substances, achieve the goal of detoxification.Due to the transformation mechanism is unknown, difficult control of process conditions, detoxification effect cannot be guaranteed.The use of raw material is cotton pulp after hot pressing leaching, in the process of the whole process, protein denaturation and serious destruction in the pulp, nutritional value cannot be guaranteed.In addition, purification of strains, complex, large investment and high cost.The above two methods only emphasized the removing gossypol, but ignored the protection of cotton meal nutrition titer, make greatly influenced its use value and economic benefits.
3. mixed solvent extraction
Solvent extraction method is to use the gaa dissolved in alcohol solvent properties, using two kinds of solvent mixture (light gasoline and ethanol or acetone and water) at the same time from cottonseed extract cotton oil and gossypol.Mixed solvent method is more in the domestic research of solvent extraction method, the existence of the problem is that the solvent separation and recovery difficulty (miscibility and azeotropic solvent is serious), solvent consumption, high cost;Solvent ratio of complex and mixed solvent method to extract the wool cotton oil contains a large number of gaa and pigment, which makes the oil quality decline, unable to form the industrial production.
4 .liquid - liquid - solid extraction
Light cotton seed shell after cleaning to miscellaneous,...