Abstract The cytolytic malt criteria viscosity and β-glucan are used as an integral part of routine laboratory control measures to classify the malt modification level and to ensure good processability. Part one of this two-part publication demonstrated that barley varieties with high cytolytic modification along with low β-glucan content tend to have a higher content of usually unconsidered water-soluble arabinoxylan. This study investigated the arabinoxylan molar mass distribution and its impact on processability. In order to observe the impact of arabinoxylans on separation processes in the brewhouse, lautering tests of different modified malt types were performed. The results suggest that in contrast to their lower β-glucan content, highly modified malt types had a higher average arabinoxylan content (767 mg/L) than medium modified samples (710 mg/L). Furthermore, differentiation of arabinoxylan molar mass resulted in a higher molar mass of 14–34% above 50 kDa in these samples. In terms of processability, flux through the spent grain cake was mainly influenced by wort viscosity (r=-0.621, p < 0.01), although arabinoxylan had little influence on the viscosity. However, 53% of highly modified malt samples had a flux of less than 4 L/h × m2 (average value) despite low β-glucan levels. A principal component analysis identified arabinoxylans as the main driving force in connection with the permeability through the filter cake, whereby especially highly modified barley varieties (60%) were affected. Arabinoxylans may have a decisive effect, so it is not only β-glucan as a structural cell wall substance and present viscosity that should be considered as determining quality characteristics.

中文翻译：

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细胞溶解麦芽修饰的测定 – 第二部分：对麦芽汁分离的影响

摘要 溶细胞麦芽标准粘度和β-葡聚糖作为常规实验室控制措施的一个组成部分，用于对麦芽改性水平进行分类并确保良好的可加工性。这本由两部分组成的出版物的第一部分表明，具有高溶细胞修饰和低 β-葡聚糖含量的大麦品种往往含有较高含量的通常不被考虑的水溶性阿拉伯木聚糖。该研究调查了阿拉伯木聚糖摩尔质量分布及其对可加工性的影响。为了观察阿拉伯木聚糖对啤酒厂分离过程的影响，对不同的改良麦芽类型进行了过滤测试。结果表明，与其较低的 β-葡聚糖含量相比，高度改性的麦芽类型的平均阿拉伯木聚糖含量 (767 mg/L) 高于中等改性的样品 (710 mg/L)。此外，在这些样品中，阿拉伯木聚糖摩尔质量的差异导致 50 kDa 以上的 14–34% 的更高摩尔质量。在可加工性方面，尽管阿拉伯木聚糖对粘度影响很小，但通过废谷物饼的通量主要受麦芽汁粘度的影响（r=-0.621，p < 0.01）。然而，尽管 β-葡聚糖水平较低，但 53% 的高度改性麦芽样品的通量低于 4 L/h × m2（平均值）。主成分分析确定阿拉伯木聚糖是与通过滤饼的渗透性相关的主要驱动力，其中特别是高度改性的大麦品种 (60%) 受到影响。阿拉伯木聚糖可能具有决定性作用，