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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zhang, Benshan Dhital, Sushil Haque, Enamul Gidley, Michael J. |
| Description | Author Affiliation: Zhang B ( School of Light Industry and Food Science, South China University of Technology, Guangzhou 510641, PR China.) |
| Abstract | In order to modify the properties of native starch granules, the formation of gelatinized granular forms (GGS) from normal, waxy, and high amylose maize, as well as potato and tapioca starches was investigated by treating granules with aqueous ethanol at varying starch:water:ethanol ratios and then heating in a rotary evaporator to remove ethanol. The modified starches were characterized using bright field, polarized and electron microscopy. Short/long range molecular order and enthalpic transitions on heating were also studied using infrared spectroscopy, X-ray diffractometry and differential scanning calorimetry respectively. A diffuse birefringence pattern without Maltese cross was observed for most GGS samples. Treatment with aqueous ethanol resulted in starch-specific changes in the surface of granules, most noticeably swelling and disintegration in waxy maize, surface wrinkling in normal maize and tapioca, swelling and opening-up in potato starches, and swelling and bursting in high amylose maize. The ratio of ethanol to water at which original granular order was disrupted also varied with starch type. GGS had less short range molecular order than native granules as inferred by comparing 1047/1022 wave number ratio from infrared spectroscopy. Similarly, A- and B-type diffraction reflections were either reduced or completely lost with evolution of V-type patterns in GGS. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Issue Number | 4 |
| Volume Number | 90 |
| e-ISSN | 18791344 |
| Journal | Carbohydrate Polymers |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-06 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Amylose Chemistry Cytoplasmic Granules Ethanol Gelatin Starch Water Calorimetry, Differential Scanning Manihot Solanum Tuberosum Thermodynamics X-ray Diffraction Zea Mays Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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