Structural features of galactans from flax fibres

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• 作者：Goubet ; Florence ; Bourlard ; Thierry ; Girault ; Raynald ; Alexandre ; Caroline ; Vandevelde ; Marie-Colette ; et. al.
• 刊名：Carbohydrate Polymers
• 出版年：1995
• 出版时间：1995
• 年：1995
• 卷：27
• 期：3
• 页码：221-227
• 全文大小：652 K

文摘

Successive extraction of mechanically-isolated flax fibres with ethylene-diaminetetraacetic acid partially neutralized with NAOH EDTA-Na₂ and NaOH solubilized about 25 % of the mass of fibres. The cation exchange capacity (CEC) of the fibres decreased from 0.100 ± 0.025 meq g⁻¹ to 0.035 ± 0.015 meq g⁻¹ after EDTA-Na₂ extraction and then was reduced to virtually nil by extraction with NaOH. This final reduction in CEC by alkali was accompanied by the extraction of small charge molecules, notably phenolic acids. These may influence the binding selectivity of the fibre towards monovalent cations. Polymers solubilized by this extraction procedure included two main types of galactans; the first type consisted of β-1→4 galactans attached to a rhamnogalacturonan I-like polymer and the second type was β-1→3, β-1→6 linked galactans attached to proteins in some unknown manner. In addition, some β-1→3 glucan, β-1→4 glucan and glucomannan-like polymers were detected.