多次超高压处理对玉米淀粉的影响

The influence of cycle time of ultra high pressure on maize strucfure

目的与方法:5%(W/V)的玉米淀粉悬浮液经过450MPa压力保压5min处理后,再在相同条件下对样品进行反复加压处理3次,淀粉样品经过抽滤、水洗、乙醇洗涤和干燥,得到多次高压改性淀粉,应用扫描电子显微镜(SEM)和X-射线衍射技术对每次处理的样品进行分析测试;结果:450MPa压力下多次高压处理对淀粉的颗粒结构影响较小,但是一次高压处理后淀粉的结晶结构就受到较大的影响,而再次进行高压处理时,压力次数对玉米淀粉的结晶结构影响较小。

Objective and method： 5% （ W/V ） corn starch suspensions were processed at 450 MPa for 5 min, samples were processed with ultra high pressure three times. High pressure modified starches were obtained by a sequent of treatment： filtration, washing with distilled water, with alcohol and acetone, and then air dried. The products were detected with scanning electron microscope （SEM） and X-ray diffraction. Conclusion： The results showed that the influence of cycle time of ultra high pressure （450 MPa） on the granule structure of maize starch was small. The crystal structure of starch happened apparent change, when the starch were processed one time. But the influence of processing cycle times on the crystal structure of corn starch was little.