December 7, 2016

Solvent extraction of lipids

Lipids are removed from lipid-containing materials by two methods: mechanical crushing and solvent extraction. Solvent extraction systems rely on solubility differences between lipids and other food components in particular system.

These solubility differences primarily relate to issues of charge or polarity and the nature of the association between lipids and the other components within the material to be extracted.

Neutral or non-polar lipids such as hydrocarbons, sterol esters, acylglycerols and carotenoids can be bound through non-covalent interactions such as van der Waals forces and hydrophobic associations between hydrocarbon chains of lipids and hydrophobic protein domains within foods.

Soxhlet apparatus
The extraction of polar lipids requires more polar solvents such as ethanol or methanol to disrupt these molecular interactions.

Depending on its efficiency the extraction procedure should be repeated to ensure total recovery of lipids. Generally, extractions are performed in triplicate.

Solvent extraction becomes more efficient when sample is heated and extraction is continues. In a Soxhlet apparatus, dried and homogenized sample are weighed in thimbles that are subjected to steady extraction with heated solvent for several hours.
Solvent extraction of lipids
at 7:54 AM
Labels: , , , ,

The Most Popular Posts

  • Crude Fiber
    Crude fiber is a measure of the quantity of indigestible cellulose, pentosans, lignin, and other components of this type in present foods. ...
  • Sources of meat
    Of the many foods obtained from the land, humans tend to prefer animal foods, mainly beef, pork, poultry and mutton as well as their by-pr...
  • Crude Fat
    Crude fat is the term used to refer to the crude mixture of fat-soluble material present in a sample. Crude fat also known as the ether ext...
  • Ash content in food
    Ash or mineral content is the portion of the food or any organic material that remains after it is burned at very high temperatures. The a...
  • The process of gelatinization
    Gelatinization occurs when starch granules are heated in a liquid. It is responsible for the thickening of food systems. The process is an i...
  • Soft drinks
    Soft drinks have become an integral part of the American lifestyle, constituting over a quarter of all beverages consumed in the United States. This ubiqui...
  • Instant Noodles
    Instant noodles have emerged as a significant segment within the global noodle industry, experiencing rapid growth and widespread consumption. Noodles, cra...
  • Healthy Diet
    Most American today are overfed yet undernourished, which eventually leads to obesity and poor health. The answer to those pervasive problem is simply to ...