کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1269389 | 972451 | 2010 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of melt-processing and ultrasonic treatment on physical properties of high-amylose maize starch Effect of melt-processing and ultrasonic treatment on physical properties of high-amylose maize starch](/preview/png/1269389.png)
High-amylose maize starch (Hylon VII) was submitted to melt-processing in an internal mixer at 100 °C and 40 rpm for 8 min. Glycerol was used as a plasticiser at different polymer/glycerol ratios. Torque and temperature curves were obtained. After glycerol extraction with ethyl alcohol, the samples were dispersed at 5 g/L, and treated by ultrasound radiation at the same conditions for 30 min. Samples were characterised by 1H NMR spectrometry, viscosity measurements, and X-ray diffractometry. The results revealed that both glycerol and water had an important role on the crystallinity properties of the resulting products. Melt-processed and sonicated samples showed similar 1H NMR spectra. Ultrasound treatment caused a significant reduction in intrinsic viscosity for the sample previously processed with the highest glycerol content, probably because of its higher solubility in water.
Journal: Ultrasonics Sonochemistry - Volume 17, Issue 4, April 2010, Pages 637–641