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The effect of extrusion screw-speed on the water extractability and molecular weight distribution of arabinoxylans from defatted rice bran

Fadel A 1 , Plunkett A 1 , Ashworth J 2 , Mahmoud AM 3 , Ranneh Y 4 , El Mohtadi M 2 Show all authors , Li W 5

Affiliations 

  • 1 1Department of Food and Nutrition, School of Health Psychology and Social Care, Manchester Metropolitan University, Righton Building, Cavendish Street, Manchester, M15 6BH UK
  • 2 2School of Healthcare Science, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, M1 5GD UK
  • 3 3Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research (CCR), Charité-University Medicine Berlin, Berlin, Germany
  • 4 5Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia
  • 5 6Institute of Food Science and Innovation, University of Chester, Chester, CH1 4BJ UK
J Food Sci Technol, 2018 Mar;55(3):1201-1206.
PMID: 29487463 DOI: 10.1007/s13197-017-3010-0

Abstract

Arabinoxylans (AXs) are major dietary fibre in cereals. Recently, AXs have attracted a great deal of attention because of their biological activities. These activities have been suggested to be related to the content of low molecular weight (Mw) AXs, in particular those with Mw below 32 kDa. Rice bran is a rich source of AXs. However, water extraction of AXs is difficult and often gives low yield. Extrusion processing has been used to increase the solubility of cereal dietary fibre. The aim of this research was to study the effect of extrusion screw-speeds (80 and 160) rpm on the extraction yield and Mw of water extractable AXs from rice bran. It was found that the extraction of AXs increased significantly with an increase in screw speed and was accompanied by a significant decrease in the Mw of AXs from extruded rice bran. The percentage of very low molecular weight AXs (0.79-1.58 kDa) significantly increased with increasing screw speed.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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