Department of Chemical Engineering, Faculty of Science, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain.
Bioresour Technol. 2011 May;102(10):6112-9. doi: 10.1016/j.biortech.2011.02.059. Epub 2011 Feb 18.
The solid waste obtained in malting industries when dehulling barley grains, which was mainly made up of barley husks, spent grains and grain fragments, was subjected to a double hydrothermal processing under selected conditions. The liquor from the second stage (containing xylooligosaccharides, XOS) was refined by membrane and ion exchange processing (with or without a previous endoxylanase treatment to reduce the XOS molecular weight). Three XOS concentrates with different purity and/or molecular weight distribution were fermented in vitro with faecal inocula to assess their prebiotic potential. Succinate, lactate, formiate, acetate, propionate and butyrate were generated in fermentations, confirming the prebiotic potential of the various products assayed. The purity of XOS concentrates did not play a significant role in fermentation, whereas the sample with shorter average degree of polymerization presented a faster fermentation kinetics and led to the highest concentration of lactic acid.
在大麦制麦行业中，当脱壳大麦谷物时会产生固体废物，主要由麦麸、废酒糟和谷粒碎片组成，在选定条件下对其进行双水热处理。第二阶段的提取液（含有木二糖，XOS）经过膜和离子交换处理（是否进行内切木聚糖酶处理以降低 XOS 分子量）进行精制。用粪便接种物对三种不同纯度和/或分子量分布的 XOS 浓缩物进行体外发酵，以评估它们的益生元潜力。发酵过程中生成了琥珀酸、乳酸、甲酸、乙酸、丙酸和丁酸，证实了所测试的各种产物具有益生元潜力。XOS 浓缩物的纯度在发酵过程中没有起到显著作用，而平均聚合度较短的样品表现出更快的发酵动力学，导致乳酸浓度最高。
