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Related Experiment Videos

Process-induced compositional changes of flaxseed

P K Wanasundara1, F Shahidi

  • 1Department of Biochemistry, Memorial University of Newfoundland, St. John's, Canada.

Advances in Experimental Medicine and Biology
|May 23, 1998
PubMed
Summary

Flaxseed offers valuable nutrients like alpha-linolenic acid, fiber, and lignans. While processing concerns exist, studies show flaxseed is safe in baked goods, and its meal can be detoxified for animal feed.

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Area of Science:

  • Food Science
  • Nutritional Science
  • Agricultural Science

Background:

  • Flaxseed (Linum usitatissimum) is an ancient edible grain with valuable components like alpha-linolenic acid, dietary fiber, and lignans.
  • Traditional use of flaxseed oil is limited by high polyunsaturated fatty acid content, but new low-alpha-linolenic acid varieties are emerging.
  • Whole flaxseed utilization in food offers complete nutrient profiles with minimal processing.

Purpose of the Study:

  • To evaluate the safety and nutritional aspects of flaxseed and its byproducts in food applications.
  • To assess the impact of processing on flaxseed's key constituents, including lipids and cyanogenic glucosides.
  • To explore methods for detoxifying flaxseed meal for animal consumption and isolating proteins.

Main Methods:

  • Analysis of oxidation products in intact flaxseed lipids under baking conditions.
  • Assessment of cyanide levels released from flaxseed during autolysis.
  • Investigation of protein isolation from flaxseed meal using sodium hexametaphosphate.
  • Evaluation of germination effects on flaxseed composition.

Main Results:

  • Flaxseed inclusion up to 28% in baked products showed no harmful effects from lipid oxidation products.
  • Cyanide levels from autolysis were below harmful limits for human consumption.
  • Flaxseed meal requires detoxification (e.g., solvent extraction) for safe use in animal rations.
  • Proteins can be isolated from flaxseed meal without compromising nutritional value.

Conclusions:

  • Flaxseed is a safe and nutritious food ingredient, with processing methods mitigating potential risks.
  • Detoxification is necessary for flaxseed meal intended for animal feed.
  • Further research on germination's impact can optimize flaxseed utilization.

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