Evaluation of the time-dependent stability of starch-hydrocolloid binary gels involving NMR relaxation time measurements |
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Authors: | Hanna Maria Baranowska Marek SikoraMagdalena Krystyjan Piotr Tomasik |
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Affiliation: | a Department of Physics, Poznań University of Life Sciences, Wojska Polskiego Street 38/42, 60-637 Poznań, Poland b Department of Carbohydrate Technology, University of Agriculture, Balicka Street 122, 30-149 Krakow, Poland c Department of Chemistry and Physics, University of Agriculture, Balicka Street 122, 30-149 Krakow, Poland |
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Abstract: | A novel, non-destructive method of evaluation of the time-dependent stability of starch gels and binary starch-non-starchy hydrocolloid gels is presented. The low-field NMR technique applied provided the following results. On storage at room temperature, binary potato starch gels with xanthan gum are more stable in time than gels with guar gum and κ-carrageenan. Xanthan and guar gums as well as κ-carrageenan are dispensable as stabilizers of stored potato starch gel and building the cassava gel structure lasted over 96 h. In the binary system with cassava starch, guar gum performed best regardless storage temperature. At room temperature, admixture of hydrocolloids to plain cornstarch gels resulted in remove of water molecules from the gel network. Stabilization of cornstarch gels with hydrocolloids was, practically, dispensable and even non-beneficial regardless storage temperature. None among tested hydrocolloids stabilized the oat starch gel. On cold storage, κ-carrageenan performed best. |
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Keywords: | Cassava starch Cornstarch Guar gum κ-Carrageenan Oat starch Potato starch Xanthan gum |
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