Data underlying the publication: Dry fractionation for endosperm recovery from a barley malt waste stream.

Cereal processing industry removes the fibrous tissues from kernels via abrasive milling, but this tends to remove part of the valuable endosperm components as well.Therefore, endosperm recovery from such abraded barley malt material (53% endosperm and 47% husk) was evaluated for three dry separation technologies.Electrostatic separation recovered 25% of the endosperm at 85% purity and this recovery increased to 39% in a second run, which indicated potential to further improve the setup.Increasingly finer sieves removed up to 40% of the husk with little endosperm loss, but further husk removal up to 95% by the finest sieve reduced the endosperm yield to 54% due to decreasing differences in smallest diameter between the endosperm and husk particles.Air classification outperformed sieving by yielding 71% of the endosperm while removing 95% of the husk, and further, less selective air classification steps could yield up to 94% of the endosperm while still removing 59% of the husk.Moreover, such additional air classification steps currently recovered residual endosperm particles more selectively than electrostatic separation after an initial air classification.Overall, air classification after abrasive milling increased the removal of insoluble matter from malted barley kernels.The loss of soluble endosperm components remained similar to the loss as observed in a single abrasive milling step.

谷物加工行业通过磨蚀研磨（abrasive milling）去除谷物籽粒中的纤维组织，但该工艺往往会同时损失部分高价值的胚乳（endosperm）成分。因此，针对经磨蚀研磨处理的大麦麦芽物料（胚乳占比53%、谷壳（husk）占比47%），本研究评估了三种干式分选技术的分选效果。静电分选技术可回收25%的胚乳，分选纯度达85%；经二次分选后，胚乳回收率提升至39%，这表明该工艺具备进一步优化的潜力。使用目数逐级增大的筛网可去除最高达40%的谷壳，且胚乳损失极少；但当采用最细筛网将谷壳去除率提升至95%时，由于胚乳与谷壳颗粒的最小直径差异缩小，胚乳收率降至54%。气流分选技术性能优于筛分：其可回收71%的胚乳，同时去除95%的谷壳；若采用选择性更低的气流分选工序，最多可回收94%的胚乳，且仍能去除59%的谷壳。此外，在初始气流分选后增设额外的气流分选工序，其对残留胚乳颗粒的回收选择性优于静电分选。总体而言，磨蚀研磨后辅以气流分选，可提升发芽大麦籽粒中不溶性物质的去除率。可溶性胚乳成分的损失率，则与单次磨蚀研磨工序中的损失水平基本相当。