Publication: Relationship of gelatinization and recrystallization of cross-linked rice to glass transition temperature
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Issued Date
2000-01-01
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ISSN
00090352
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2-s2.0-0034090136
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Mahidol University
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SCOPUS
Bibliographic Citation
Cereal Chemistry. Vol.77, No.3 (2000), 315-319
Suggested Citation
Pathama Chatakanonda, Saiyavit Varavinit, Pavinee Chinachoti Relationship of gelatinization and recrystallization of cross-linked rice to glass transition temperature. Cereal Chemistry. Vol.77, No.3 (2000), 315-319. doi:10.1094/CCHEM.2000.77.3.315 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/25824
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Title
Relationship of gelatinization and recrystallization of cross-linked rice to glass transition temperature
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Abstract
Nonwaxy rice starch was cross-linked with sodium trimetaphosphate and sodium tripolyphosphate to obtain different degrees of cross-linking (9.2, 26.2, and 29.2%). The objective was to investigate the influence of cross- linking on thermal transitions of rice starch. Starch suspensions (67% moisture) were heated at 2°C/min using differential scanning calorimetry (DSC) to follow melting transition of amylopectin. Biphasic transition were observed at ≃60-95°C in all samples. Melting endotherms of amylopectin shifted to a higher temperature (≤5°C) with an increasing degree of cross- linking, while there was no dramatic change in enthalpy. Recrystallization during aging for 0-15 days was significantly suppressed by cross-linking. The delayed gelatinization and retrogradation in cross-linked starch were evident due to restricted swelling and reduced hydration in starch granules. Glass transition temperature (T(g)) measured from the derivative curve of heat flow was -3 to -4°C. No significant change in T(g) was observed over the storage time studied.