干法超微粉碎对苹果渣纤维物性的影响

Effect of Ultra-fine Pulverization of Dry Processing on Physical Properties of Apple Pomace Fiber

为了提高苹果渣膳食纤维的利用率,采用气流磨超微粉碎技术,对苹果渣纤维进行干法粉碎,并对处理后不同粒度的苹果渣纤维分别进行物理性质的测定,QLM-80K气流磨对苹果渣纤维素超微粉碎的最小粒度平均为22.2μm。由扫描电镜和X射线衍射图表明,粉碎前后苹果渣纤维的晶区没有因微粉碎的超强作用力而发生改变。经过超微粉碎处理后的苹果渣纤维与粗粉相比:持水力和膨胀力有所减小,休止角和滑角增大为65°和73°,水溶性增加到36.7%。脂肪酸吸附能力、阳离子交换能力和胆汁酸的吸附能力下降。吸附NO2-的能力变化不大,对胆固醇吸附能力增加到24.83 mg/g。结果表明:干法超微粉碎对苹果纤维素的结构发生整体性变化,但聚合物的结晶状态未发生改变。

In order to improve its utilization rate, apple pomaee fiber was dry grounded by jet mill and the phys- ical properties of the dry grounded pomace fiber were determined. The jet mill of QLM-80K ultra-fine pulveri- zation was applied to the optimal conditions for milling apple pomace fiber and leading to the best particle size 22.2 ~ （mean value）. Adopting the laboratory technics course,apple pomace fiber of 22.2 tun （mean val- ue） were prepared for physical properties exploration. The curve by scanning electron and X-ray diffraction a- nalysis showed that crystal region of this apple pomace fiber was not changed by micro-milling force. In com- parison with the coarse meal, the physical properties of the apple pomace fiber of ultra-fine pulverization were enhanced：repose angle, slip angle, water-solubility and cholesterol adsorption ability increased to 65% ,73%, 36. 7% and 24.83 rag/g, respectively. But water binding capacity, swelling capacity, cation exchange capacity, fat- ty acids adsorption ability, and bile adsorption ability decreased. NO2- adsorption ability changed little. Conse- quently, the structures of apple pomace fiber were changed entirely by dry processing of ultra-fine pulverization without alteration of the polymeric crystalline state.