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Because of the positive role of arabinoxylans and especially their water-soluble fractions in establishing bread properties, it seems reasonable to use them as natural bread improvers. In this work, an adequate isolation procedure of water-soluble arabinoxylans from rye grain with efficient purification steps is presented, delivering 2.9 % yield from wholemeal with a content of arabinoxylan of approximately 70 % and an arabinose/xylose ratio of 0.7. Furthermore, soluble arabinoxylans were modified by enzymatic hydrolyses, cross-linking with peroxidase/H2O2 treatment and combination of both for developing preparations applicable for bread making with different quality profiles. Additionally, a detailed analysis of chemical composition and molecular dimension was carried out by HPLC, SEC, HPSEC and viscosity measuring. The preparation after cross-linking showed considerably higher molar mass values, lower solubility and higher viscosity with high Huggin’s constant compared to the not modified sample. Otherwise, the combination of enzymatic hydrolysis and cross-linking resulted in the formation of arabinoxylan preparations with only slight degree of cross-linking and properties comparable with the only hydrolyzed sample.
| Authors: | Krzysztof Buksa, Rafał Ziobro, Anna Nowotna, Werner Praznik, Halina Gambuś | |
| Journal: | European Food Research and Technology | |
| Year: | 2012 | |
| DOI: | 10.1007/s00217-012-1765-0 | |
| Publication date: | 21-06-2012 |
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