超高压改性玉米淀粉的回生性研究

5%的玉米淀粉悬浮液在500、550、600、650MPa压力下处理5min后,分别放置0、3、5、10d再进行干燥处理,应用X-射线衍射技术对样品的结晶度进行测定,结果发现,经过超高压处理后的样品在低温下冷藏回生后结晶度均有一定程度的提高,500MPa处理后放置3d的样品回生程度最高,且淀粉的晶型不变;550MPa处理后放置3d的样品回生程度也最高,但更长时间的回生却造成了淀粉晶型的改变;淀粉经过600MPa和650MPa处理后放置,结晶度均有一定程度的升高,且晶型变为B型。

Study on Retrogradation of Ultra-high Pressure Modified Starch with Maize

Corn starch-water suspension(5%, W/V) was subjected to high pressure treatment at 500, 550, 600, 650 MPa for 5 mim, The samples were dried after 0, 3, 5, 10 days respectively. X-ray diffraction was used to determine. The results showed that to a certain extent crystallinity of the sample treated by ultra high pressure after annealing in low temperature increase. After 3 days storage, a maximum retrogradation extent in the UHT-treated starches at 500 MPa is obtained while there are no changes in crystalline type. The same also happened to the UHT-treated starches at 550 MPa, but retrogradation for more long time could cause the variation in crystalline type. The UHT-starches at 600 and 650 MPa are storied for a period of time, there are increase of crystallinity and the crystalline type chang from A to B.