Abstract
The effects of gelatinization and gel storage conditions on the formation of canna resistant starch (RS) were investigated. Starch slurries (10%, dwb) were autoclaved at 121 °C for 30, 60, and 120 min. The gels obtained were subsequently stored at different temperatures (4 °C, 30 °C, and 100 °C) and times (0, 1, 3, 5, and 7 days). Analyses of the RS content in gelatinized starch samples in comparison with that in granular starch showed that the RS fraction in granular starch was very high (97.3% w/w); however, nearly all of the RS was thermally unstable, as indicated by a great reduction in RS content (to 1.9% w/w) after cooking at 100 °C for 20 min. The RS contents in gelatinized starch samples were 12.0–15.9% w/w, which were reduced to 7.9–10.8% w/w after cooking. Storage of gels resulted in a significant increase in the amount of the thermally stable RS fraction, e.g., a thermally stable RS content of 16.8% w/w was found in the gel sample gelatinized for 120 min and stored at 4 °C for 3 days. This indicated that the ordered structures of the RS portion were tightened under the storage conditions. The gelatinization temperature of canna starch was 72.2 °C, whereas the RS products exhibited two melting temperature ranges, 51.1–76.3 °C and 163.1–165.1 °C, indicating that the newly formed crystals were very strong.
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We gratefully acknowledge grants from the Thailand Research Fund under TRF-MAG Project MRG-WII515S078 and the Commission on Higher Education, Thailand under KMUTT National University Research Project.
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Wandee, Y., Puttanlek, C., Rungsardthong, V. et al. Effects of Gelatinization and Gel Storage Conditions on the Formation of Canna Resistant Starch. Food Bioprocess Technol 5, 2665–2673 (2012). https://doi.org/10.1007/s11947-011-0629-0
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DOI: https://doi.org/10.1007/s11947-011-0629-0