Journal
JOURNAL OF CEREAL SCIENCE
Volume 57, Issue 3, Pages 348-355Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jcs.2012.12.006
Keywords
High-amylose corn starch; Debranched high temperature-pressure treatment; Fractal structure; Resistant starch
Categories
Funding
- National Natural Science Funds of China [31071503]
- National Key Technology RD Program [2012BAD33B04, 2012BAD34B07, 2012BAD37B01]
- Key Project of Technology Innovation Research for Universities in Guangdong [2012CXZD0006]
- Guangdong Natural Science Foundation [S 2011010001677]
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High-amylose corn starch (HACS) was treated with high temperature-pressure (HTP) treatment and pullulanase debranching. It was found that 24 h storage was favorable for resistant starch (RS) formation. Structure (granular morphology, fractal structure, lamellar structure, crystalline structure, weight-average molecular weight) and properties (swelling power, solubility, enzymatic resistivity) were evaluated for native starch and the samples with 24 h storage. By modification, the surface became loose and rough fragmented and the birefringence crosses disappeared. All samples displayed a B + V crystalline structure. The scattering objects of native starch at the higher scale level were more compact than those of modified starches, and the latter displayed a mass fractal structure which became more compact as debranching increased. The native starch contained RS2 and RS5, while the modified samples included RS3 and RS5. The higher amount of V-type crystals and the starch chains with smaller molecular weight could lead to form more RS. Interestingly, a surface fractal structure with D-s2 was measured for the modified starches, leading to more RS, since some active sites of starch molecules were masked by the ordered-aggregations of molecular chains in the scattering objects. Furthermore, the more compact scattering objects with D-m1 contributed to forming more RS. (C) 2012 Elsevier Ltd. All rights reserved.
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