中文摘要：

小麦麸皮是小麦加工中重要的副产物,其中糊粉层含有大量对人体健康有益的功能物质.本试验研究了干法机械分离麸皮中糊粉层的工艺.首先对小麦麸皮进行预粉碎及筛分分离处理,降低尺寸并去除部分胚乳,再将大于425 μm（40目）的小麦麸皮投入分级式冲击磨进行粉碎.粉碎后的小麦麸皮被筛分分离成B1（＞425 μm）、B2（180 ～ 425 μm）、B3（100～180 μm）、B4（＜100 μm）组分.选定总磷含量作为糊粉层标识物,考察该工艺下分级式冲击磨刀片线速度、分级轮转速及进料速度对各分离组分总磷含量的影响.结果表明：当刀片线速度36 m/s、分级轮转速2 800 r/min、进料速度900 g/h条件下,B3组分的总磷含量高达（18.46±0.51） mg/g,糊粉细胞结构完整,糊粉层含量高达65.30％,小麦麸皮各结构层分离效果明显.

英文摘要：

Wheat bran is an important by - product of wheat processing which is rich of aleurone layer and is benefieial for health. The separation process of bran aleurone layer from wheat bran adopting dry mechanical fraction- ation has been studied in the paper. In order to decrease bran particle size and remove most of endosperm, pre - milling and sieving step have been used. The wheat bran larger than 425 μm （40 mesh） was submitted to classify - impact mill for grinding and air classification. After these processes, the collected wheat bran were sieved into four fractions： B1 fraction （ 〉425 μm）, B2 fraction （180-425 μm ）, B3 fraction （100- 180 μm） and B4 fraction （ 〈 425 μm）. The total phosphorus content of bran fraction was selected as the aleurone layer marker, and the re- search was conducted to indicate the effects of blade peripheral velocity, vortex classifier wheel speed and feed rate of classify - impact mill on the total phosphorus content of each fraction. Based on the consequences of the single factor experiments, the utilized processing parameter was ascertained as follow： peripheral velocity of impact blade 36 m/s,vortex classifier wheel speed 2 800 r/min, feed rate 900 g/h. On the above conditions, the content of total phosphor- us in B3 bran fraction increased to （18.46 ±0.51 ） mg/g; while aleurone cell structure was intact and purity reached to 65.30%. Different wheat bran structural layers were dissociated obviously.