The lignans in flaxseed are mainly secoisolariciresinol diglucoside (SDG) and its aglycone-separated lycopene resin (secoisolariciresinol, SECO), and melanoquinol (matairesinol, MAT) and so on. Since SDG accounts for more than 90% of flaxseed lignans, flax lignans in the narrow sense often refer to SDG.
Although lignans are found in many crops, flaxseed is the most abundant. Flax seeds usually contain 0.3% to 1.8% lignans, which is about 75-800 times that of other plants. A large number of domestic and foreign studies have shown that flax lignan has biological activities such as anti-cancer, anti-tumor, prevention of cardiovascular disease, prevention of osteoporosis, adjuvant treatment of diabetes and slowing of female climacteric syndrome.
In terms of commercialization, since flax lignans are mainly concentrated in the husk of flaxseed, many foreign companies, such as Golden Flax 4U in the United States and Natunola in Ottawa, Canada, provide 100% pure lignan products. Natural flaxseed shell, SDG content is usually ≤ 5%.
Flaxseed lignan products are directly used as commodities or food additives/auxiliaries in the form of husks, which are relatively rare in China.
The flax lignan products on the market in China are mainly flaxseed extracts with a purity of 20% to 80%. These extracts are mainly used in food, health care products, medicine, and cosmetics.
Flaxseed can be directly used as food, and can also be comprehensively utilized and deep-processed. Flaxseed oil, flax lignan, protein, linseed gum (polysaccharide) can be comprehensively developed and utilized. With the improvement of standards and the market Mature, the development of the flax industry is huge.