Methods for dehulling of flaxseed, producing flaxseed...

Details Methods for dehulling of flaxseed, producing flaxseed... Methods for dehulling of flaxseed, producing flaxseed...

B - Operations, Transporting

02

B

B02B 5/02 (2006.01) C07G 1/00 (2006.01)

Patent

CA 2167951

A dry process for dehulling has been developed in order to utilize all components of flaxseed. The dehulling process is composed of three steps: first the flaxseed is dried, then broken (milled) and fractionated by air classification to produce a hull fraction and a kernel (embryo) fraction. Three drying methods, including oven drying, microwave drying and fluid bed drying, were optimized for efficiency of removing moisture by response surface methodology (RSM) and suitability for the dehulling process. Of the drying methods tested, fluid-bed drying appeared most suitable for the dehulling process with satisfactory drying efficiency. Finally, an optimized flaxseed dehulling process consists of drying of the seeds using fluid-bed dryer, milling by barley Pearler and fractionation of the hull and the kernel (embryo) fractions by air classification. The yield of flaxseed hulls and kernels obtained by the optimized process were 22.6% and 72.2%, respectively. The chemical composition of the hulls was carbohydrates 48.3%, proteins 16.8%, crude oil 26.5%, moisture 5.0% and ash 3.5% compared to that of the embryo fraction (carbohydrates 22.0%, proteins 23.9%, crude oil 47.7%, moisture 3.6% and ash 3.8%) on dry base. Lignans and flaxseed gum are extracted sequentially from the hull while the kernels, purified by sieving, are used as a food and/or feed ingredient with or without further processing.

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