Improving the bioactive functionality of barley dietary fibre by chemical treatments in combination with extrusion process
2019
Ahmad, N. | Saeed, F. | Niaz, B. | Bader Ul Ain, H. | Arshad, M. U. | Tufail, T.
The present work was carried out to observe the comparative effectiveness of different chemical treatments in combination with simultaneous thermal treatment on soluble and insoluble dietary fibre ratio to improve functional properties of barley. For this purpose, two varieties of barley i.e., Haider-93 and Jau-87 were assessed for their chemical composition, mineral, non-starch polysaccharides and dietary fibre contents through respective methods. Next, both varieties were chemically treated with acid, alkaline and consecutive acid-alkaline treatments in combination with thermal treatment. Results of chemical composition revealed that Jau-87 was higher in moisture (11.4%), crude fat (2.67%) and crude fibre (4.70%) whereas Haider-93 exhibited higher ash (2.56%) and crude protein content (12.7%). Moreover, barley was rich source of potassium ranging from 4.77-5.07 g/kg. Likewise, main non-starch polysaccharides in barley were arabinoxylan (3.60-3.77%) and β-glucan (3.65-3.67%). Furthermore, barley contained more insoluble dietary fibre (12.00-12.40 g/100 g dm) than soluble dietary fibre (4.73-5.70 g/100 g dm). Additionally, modification of soluble (1.48%) and insoluble dietary fibre (8.71%) ratio through extrusion processing was non-significant whilst acid-alkaline treatment showed highly significant results i.e., 771.46% increase in soluble dietary fibre and 53.39% decrease in insoluble dietary fibre It was therefore concluded that chemical treatments alone or in combination with twin-screw extrusion increased soluble dietary fibre. However, simultaneous effect of acid and alkaline treatment most effectively increased the solubility of barley.
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