Abstract
Soluble flaxseed gum (SFG) was extracted from flax (Linum usitatissimum) hulls using hot water, and its functional groups and antioxidant properties were investigated using infrared spectroscopy and different antioxidant assays (2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS), reducing power capacity, and β-carotene bleaching inhibition assay), respectively. The antioxidant capacity of SFG showed interesting DPPH radical-scavenging capacity (IC50 SFG = 2.5 mg·mL−1), strong ABTS radical scavenging activity (% inhibition ABTS = 75.6% ± 2.6% at 40 mg·mL−1), high reducing power capacity (RPSFG = 5 mg·mL−1), and potent β-carotene bleaching inhibition activity (IC50 SFG = 10 mg·mL−1). All of the obtained results demonstrate the promising potential use of SFG in numerous industrial applications, and a way to valorize flaxseed hulls.
Highlights
Flax (Linum usitatissimum L.) was first cultivated as a fiber crop; its value and importance as an oil source has been interestingly increased [1]
It should be noted that oil content in flaxseed hulls was lower than that reported for rapeseed hulls (21.7% ̆ 1.8%, dry basis), probably due to the easier way to dehull flaxseeds compared to rapeseeds
Soluble flaxseed gum (SFG) was lower than that reported for other polysaccharides, such as those extracted from guara fruits
Summary
Flax (Linum usitatissimum L.) was first cultivated as a fiber crop; its value and importance as an oil source has been interestingly increased [1]. From a health point of view, agri-food and pharmaceutical industries have shown a growing interest in flax seeds due to their richness in nutritionally valuable compounds, such as lignans (i.e., secoisolariciresinol diglucoside, α-linolenic acid, and soluble flaxseed gum (SFG) [2,3]. Previous works showed that a better extraction of SFG could be performed during 3 h at a temperature ranging from 85 to 95 ̋ C, and a pH ranging from 6.5 to 7.0 [6]. The monosaccharide composition of SFG showed the presence of fucose, rhamnose, arabinose, galactose, glucose, and xylose, with the respective percentages of 7.0 ̆ 0.2, 16.5 ̆ 0.6, 12.7 ̆ 0.1, 22.4 ̆ 1.0, 2.7 ̆ 0.1, and 38.6 ̆ 1.2 [5]. Its low viscosity (shear rate ranging from 10 to 1000 s1 ) compared to other gums, such as locust
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