Short-chain fatty acid profiles from flaxseed dietary fibres after in vitro fermentation of pig colonic digesta: Structure-function relationship

Publication date: Available online 30 September 2015 Source:Bioactive Carbohydrates and Dietary Fibre Author(s): Huihuang H. Ding, Steve W. Cui, H. Douglas Goff, Joshua Gong Flaxseed (Linum usitatissimum L.) is rich in dietary fibres. There are four major soluble dietary fibre fractions, and their molecular structures have been characterised; however, the structure-function relationship on the short-chain fatty acid (SCFA) profiles is still unknown. SCFA profiles produced by in vitro fermentation of pig colonic digesta with soluble flaxseed dietary fibre fractions were determined by gas chromatography with psyllium arabinoxylans as the reference fibres. The results revealed that total SCFA production from all tested dietary fibres were significantly higher than negative control (NC) after 72h fermentation. Acetic acid was the major SCFA produced, followed by propionic acid and butyric acid during 72h fermentation. The acetic acid production from flaxseed kernel xyloglucans, and butyric acid production from flaxseed mucilage arabinoxylans were significantly higher than negative control (NC) after 48h fermentation. Both psyllium and flaxseed mucilage arabinoxylans promoted butyric acid production more effectively than other tested dietary fibres during 48h fermentation, while flaxseed kernel xyloglucans and flaxseed RG-I were more effective on promoting acetic acid production. The dietary fibre strucutre played major roles on promoting specific SCFAs, and the confor...
Source: Bioactive Carbohydrates and Dietary Fibre - Category: Food Science Source Type: research