A systematic micro-dissection of brewers’ spent grain

Antioxidant capacity, arabinoxylans content and in vitro glycaemic index of cereal-based snacks incorporated with brewer's spent grain

“…The monosaccharide composition after acid hydrolysis of BSG showed a high content of xylose followed by glucose, arabinose and hexuronic acid and residual amounts of galactose and mannose with an ara/xyl ratio of 0.41 (Table 2). These results are in accordance with those reported for BSG monosaccharide composition (Jay et al, 2008;Mussatto et al, 2006). The contents of arabinose and xylose units were determined to quantify the arabinoxylans present (Table 2), and similar to the previous section, the recoveries of arabinose and xylose were also calculated to assess the effects of thermal processing on the arabinoxylan content (Table 3).…”

“…The extraction of phenolic compounds was performed with an adaptation of the methods described by other research groups (Bartolomé et al, 2002;Jay et al, 2008). In brief, the dried and ground samples (10 mg) were hydrolyzed under nitrogen with NaOH (4 mol/dm 3 ) solution for 17 h in the dark at 25  C and 100 rpm (incubator Innova 42, Mason technology, Dublin, Ireland).…”

“…The degree of arabinoxylan substitution is usually evaluated by the arabinose/xylose ratio, which is typically in the range of 0.4e0.7. The arabinose molecules may be esteried with hydroxycinnamic acids, monomeric or dimeric ferulic acid and p-coumaric acid (Bartolomé, Santos, Jiménez, del Nozal, & Gómez-Cordovés, 2002;Jay et al, 2008;Mussatto et al, 2006;Vanbeneden, Gils, Delvaux, & Delvaux, 2007). Ferulic and p-coumaric acids bound to the cellular walls of the germinated barley grains were pointed as very interesting potential antioxidants (Maillard & Berset, 1995).…”

Influence of grain particle sizes on the structure of arabinoxylans from brewer's spent grain

“…This result is in accordance with the results reported by Jay et al (2008). Total sugars were influenced mostly by the contents of xylose, arabinose and glucose, thus reflecting the presence of arabinoxylans (AX) and also the presence of starch and possibly glucans as suggested by Jay et al (2008).…”

“…Components of BSG can be fractionated effectively by simple milling and sieving, and the fractionation profile will depend on the instrumentation, mill and sieve mesh sizes used (Jay et al, 2008). However, as the fractionation impact on AX alkaline extraction was not studied yet, this work aims to evaluate the BSG particle size influence on the alkaline extraction of AX.…”