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- Title
Content and molecular weight of water-extractable arabinoxylans in wheat malt and wheat malt-based wort with different Kolbach indices.
- Authors
Guo, Mengmeng; Du, Jinhua; Zhang, Kaili; Jin, Yuhong
- Abstract
BACKGROUND Arabinoxylans ( AXs) are partially water-extractable polymers that cause problems of viscosity and filterability during beer brewing. This study investigated the effects of Kolbach index ( KI) on water-extractable AXs ( WEAXs). RESULTS KI had positive correlations with extract ( r = 0.845) and free amino nitrogen ( FAN) ( r = 0.958). The contents of malt WEAXs ( WEAXsm), total AXs and wort AXs ( WAXs) were 10.8-11.6 g kg−1, 57.5-60.8 g kg−1 and 137.5-140.5 mg per 100 mL respectively and the corresponding arabinose/xylose (A/X) ratios were 0.52-0.56, 0.55-0.62 and 0.48-0.50. The molecular weight (Mw) ranged from 4.92 × 104 to 6.93 × 104 Da for WEAXsm and from 1.24 × 104 to 2.90 × 104 Da for WAXs. KI had negative correlations with the average degree of polymerization ( avDP) of malt ( r = −0.877) and wort ( r = −0.978). Wort viscosity showed a positive correlation with the Mw of WEAXsm (Mwm) ( r = 0.821). CONCLUSION Increasing KI can promote the degradation of the xylan backbone, while it cannot affect the branching of the polymer chain and the content and Mw of WEAXs. © 2014 Society of Chemical Industry
- Subjects
MOLECULAR weights; ARABINOXYLANS; WHEAT; MALT industry; DEGREE of polymerization; XYLOSE
- Publication
Journal of the Science of Food & Agriculture, 2014, Vol 94, Issue 13, p2794
- ISSN
0022-5142
- Publication type
Article
- DOI
10.1002/jsfa.6631