A Dry Mechanical Method for Concentrating the Lignan Secoisolariciresinol Diglucoside in Flaxseed (original) (raw)

2000, Lebensmittel-Wissenschaft & Technologie

A dry mechanical process was evaluated for obtaining a hull-rich fraction from yaxseed. Flaxseed hulls (seed coats) are an excellent source of secoisolariciresinol diglucoside (SDG), a lignan with potential functional food applications, but yaxseed hulls adhere tightly to the embryo, making separation dizcult. A Comitrol processor was used to mill the seed, followed by sieving and aspiration to obtain a hull-rich fraction from Neche and Omega yaxseed cultivars. As a result, the content of secoisolariciresinol diglucoside (nonfat, dry basis) increased from 12.9 and 14.3 g/kg in whole Neche and Omega seed, respectively, to 27.6 and 23.8 g/kg (weighted averages) in the hull-rich fractions. The signixcant (P(0.0005) inverse correlation between oil and SDG contents for cv. Neche suggests that oil content in dry-milled fractions is a useful indicator of secoisolariciresinol diglucoside content. Compared to similar reported processes, this was less ewective at producing a hull-free embryo, but the Neche hull fraction contained much less fat (173 g/kg weighted average) than the other processes. The hull fraction appears to be a good source of SDG for functional food studies.

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