Effect of high hydrostatic pressure on the supramolecular structure of corn starch with different amylose contents

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• 作者：Zhi Yang^a ; Peter Swedlund^a ; Yacine Hemar^a ; ^c ; ^{y.hemar@auckland.ac.nz" class="auth_mail" title="E-mail the corresponding author} ; Guang Mo^b ; Yanru Wei^b ; Zhihong Li^b ; Zhonghua Wu^b
• 关键词：Corn starch ; Different amylose content ; High hydrostatic pressure (HHP) ; SAXS/WAXS
• 刊名：International Journal of Biological Macromolecules
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：85
• 期：Complete
• 页码：604-614
• 全文大小：3460 K

文摘

Corn starches with amylose contents ranging from 0 to 80% were suspended in 60 wt% water or ethanol and subjected to high hydrostatic pressure (HHP) up to 600 MPa. The impact of HHP treatment on the granule morphology, lamellae structures, and crystalline characteristics were examined with a combination of SAXS, WAXS and optical microscopy. All starch dispersed in water showed a decrease in area of the lamellar peak in the SAXS data at q ∼ 0.6 nm⁻¹. The lamellae thickness (d) increased for pressurized waxy, normal, and Gelose80 corn starches, suggesting water is forced into starch lamellae during HHP. However, for Gelose50 corn starch, the d remained constant over the whole pressure range and light microscopy showed no obvious granule swelling. WAXS studies demonstrated that HHP partially converted A-type starches (waxy and normal corn) to starches with a faint B-type pattern while starches with a B + V-type pattern (Gelose50 and Gelose80), were not affected by HHP. All corn starches suspended in ethanol showed no detectable changes in either granule morphology, or the fractal, the lamellae, and the crystalline structures.