flaxseed hull extract lignans sdg oil flaxseed oil extract flaxseed hull extract lignans sdg linum usitatissimum secoisolariciresinol diglycoside secoisolariciresinol diglycoside, or sdg, is a plant lignan most notably found in flaxseed (linseed). sdg is classified as a phytoestrogen since it is a plant-derived, nonsteroid compound that possesses estrogen-like activity. sdg has weak estrogenic activity. the level of sdg in flaxseed typically varies between 0.6% and 1.8%. lignans are one of the two major classes of phytoestrogens; the other class is the isoflavones. plant lignans are polyphenolic substances derived from phenylalanine via dimerization of substituted cinnamic alcohols. mammalian lignans are lignans derived from plant lignans. for example, following ingestion, sdg is converted to the aglycone secoisolariciresinol, which is then metabolized to the mammalian lignans enterolactone and enterodiol. most of the effects of oral sdg are mediated by enterolactone and enterodiol. the molecular formula of sdg is c32h46o16, and its molecular weight is 686.71 daltons. the aglycone of sdg is also known as 2, 3-bis (3-methoxy-4-hydroxybenzyl) butane-1, 4-diol. enterolactone is also known as trans-2, 3-bis [(3-hydroxylphenyl) methyl]-butyrolactone. ******************************************* if there are any further questions, please do not hesitate to contact me. bring nature to better life! organic herb inc. address:n0.1038shanshuirenjia3rd,kaiyuanroad,xingsha,changsha,china contact : ms.lily liu phone +86 731 4060868 mobile +86 135 1747 5149 fax +86 731 4023669 email: lily@organic-herb.com msn messenger： lily@organic-herb.com website: http://www.organic-herb.com