Changes in the arabinoxylan fraction of wheat grain during alcohol production.

Ondrej Kosik,Peter R Shewry,Stephen J Powers,Afroditi Chatzifragkou,Parvathy Chandran Prabhakumari,Dimitris Charalampopoulos,Alison Lovegrove,James Brosnan,Linde Hess

doi:10.1016/j.foodchem.2016.10.109

Ondrej Kosik, Peter R Shewry + Show 7 more

Open Access

https://doi.org/10.1016/j.foodchem.2016.10.109

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Abstract

Laboratory produced DDGS samples were compared with commercial samples from a distillery and a biofuel plant. Changes in structure, solubility and content of arabinoxylan (AX) was determined. The distillation process results in a relative increase of AX content compared to the starting material. The heating and drying processes involved in the production of DDGS lead to an increased solubility and viscosity of water-extractable AX. Production of DDGS results in structural changes to the AX. There is a decrease in 2- and 3-linked arabinose oligosaccharides, that contributes to around a 50% reduction in arabinosylation in DDGS compared with the starting grains. The current study shows that laboratory-scale DDGS provide an accurate representation of the commercial scale and that the AX composition of DDGS is consistently uniform irrespective of starting material. The uniformity of DDGS and thin stillage makes them a good potential source of AX for production of prebiotics or other novel products.

Highlights

Distillers’ Dried Grains with Solubles (DDGS) and Wet Distillers Grains (WDG) are the main co-product of distilling processes during which starch from grains is converted into glucose and fermented into ethanol
Up to 85% of the thin stillage is concentrated, mixed with wet solids and dried down to produce DDGS (Chatzifragkou et al, 2016)
Claire, Istabraq, Viscount and Warrior grown at Rothamsted Research in two consecutive years (2012 and 2013) were used for laboratory scale production of Distillers’ Dried Grains with Solubles (DDGS) by The Scotch Whisky Research Institute Edinburgh, potential spirit yield was determined (Agu, Bringhurst, & Brosnan, 2006) and wet distillers grains (WDG) and thin stillage (TS) samples provided for analysis

Summary

Introduction

Distillers’ Dried Grains with Solubles (DDGS) and Wet Distillers Grains (WDG) are the main co-product of distilling processes during which starch from grains (wheat, barley, maize or rye) is converted into glucose and fermented into ethanol. Bioethanol is produced for two main purposes; traditionally as beverages or potable ethanol and more recently as a biofuel for automotive transportation (Chatzifragkou et al, 2015). Up to 85% of the thin stillage (the liquid remaining after removal of solids) is concentrated, mixed with wet solids and dried down to produce DDGS (Chatzifragkou et al, 2016). It has been reported for maize that the concentrations of. Similar trends have been reported for wheat and mixed cereal DDGS (Nuez Ortín & Yu, 2009)

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