| 1. |
- De Arcangelis, Elisa, et al.
(författare)
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Structure analysis of beta-glucan in barley and effects of wheat beta-glucanase
- 2019
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Ingår i: Journal of Cereal Science. - : Elsevier BV. - 0733-5210 .- 1095-9963. ; 85, s. 175-181
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Tidskriftsartikel (refereegranskat)abstract
- In this study, beta-glucan in samples of sifted flour from six barley varieties was sequentially extracted with water and NaOH obtaining three fractions: water-extractable (WE), NaOH- extractable (NaE) and residual (Res). beta-Glucan isolates were incubated with lichenase and oligomers released were analysed with high performance anion exchange chromatography coupled with pulsed amperometric detection (HPAEC-PAD). A higher ratio of 3-O-beta-cellobiosyl-D-glucose (DP3) to 3-O-beta-cellotriosyl-D-glucose (DP4) is reported in WE, NaE and Res fractions in variety SLU 7 (shrunken endosperm) compared to the other varieties, suggesting a more packed beta-glucan structure. Water-extractable and water-unextractable beta-glucan fractions were incubated with wheat extract and effects of wheat beta-glucanase on the structure was assessed after lichenase digestion and analysis with HPAEC-PAD. Findings suggest that wheat beta-glucanase manifests a selective hydrolysis towards beta-glucan with lower DP3/DP4 ratio and that beta-glucan of SLU 7 is composed of a population with higher DP3/DP4 ratio and hence with a more tighten structure which may be more resistant to enzymic action. Overall, the results obtained are of interest to characterise barleys differing in starch and dietary fibre composition, specifically shrunken endosperm barley SLU 7 in the perspective of its inclusion in the production of beta-glucan enriched foods.
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| 2. |
- Djurle, Susanne, et al.
(författare)
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Effects of baking on dietary fibre, with emphasis on beta-glucan and resistant starch, in barley breads
- 2018
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Ingår i: Journal of Cereal Science. - : Elsevier BV. - 0733-5210 .- 1095-9963. ; 79, s. 449-455
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Tidskriftsartikel (refereegranskat)abstract
- In this study, 50% sifted barley flour from six different varieties and 50% refined wheat flour was used to bake bread. The flour mixture and the bread crumb and crust were analysed for content and composition of total dietary fibre, arabinoxylan, fructan, beta-glucan, starch and resistant starch. Total dietary fibre content and extractability were not changed significantly by bread making. The extractability of mixed linkage (1 -> 3), (1 -> 4)- beta-D-glucan (beta-glucan) increased with baking, while the average molecular weight of beta-glucan decreased. However in one variety, SW 7, higher average molecular weight was maintained and a different pattern was apparent in the molecular weight distribution. SLU 7 is thereby promising for inclusion in bread where a higher molecular weight of beta-glucan is preferred, especially since the content of beta-glucan in SLU 7 is high. The resistant starch formed positively correlated with amylose content. The high amylose variety yielded 2.9% resistant starch in the bread crumb, making an important contribution to total dietary fibre. (C) 2017 Elsevier Ltd. All rights reserved.
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| 3. |
- Djurle, Susanne, et al.
(författare)
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Milling and extrusion of six barley varieties, effects on dietary fibre and starch content and composition
- 2016
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Ingår i: Journal of Cereal Science. - : Elsevier BV. - 0733-5210 .- 1095-9963. ; 72, s. 146-152
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Tidskriftsartikel (refereegranskat)abstract
- Barley is a rich source of dietary fibre that can promote beneficial physiological effects. The carbohydrate composition in different barley varieties differs considerably and choice of variety is thus important. This study examined whether differences in carbohydrate composition observed in barley kernels of different varieties persisted in the sifted flour and in an extruded product. Six barley varieties were milled and extruded and dietary fibre and starch in the kernels, flour and extruded product were analysed. The starch content was found to be higher in flour and extruded product than in kernels. The content of arabinoxylan was higher in sifted flour than in kernels, but was decreased by extrusion. The extractability of arabinoxylan was increased by extrusion, while its average molecular weight was decreased. Extrusion also decreased the content of mixed-linkage (1 -> 3),(1 -> 4)-beta-D-glucan in all varieties, but increased its extractability. The six barley varieties were affected in much the same way by milling and extrusion, but clear differences could still be observed. For example, the arabinoxylan in variety SW 28708 was less affected and variety KVL 301 had much lower extractability (76% vs 91-98%) of mixed-linkage (1 -> 3),(1 -> 4)-beta-D-glucan after extrusion than the other varieties. (C) 2016 Elsevier Ltd. All rights reserved.
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