Effect of longer heating time on depolymerization of low moisturized starches

N. Igura, I. Hayakawa, Y. Fujio

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Low moisturized potato, sweet potato, corn and wheat starches were treated with a flow tester under heated and heated-sheared conditions. The starches depolymerized into lower molecule by longer heating time at 150°C. With an increase in heating time, the cold water solubility of starches increased and the degree of depolymerization progressed. Comparing heated treatment with longer heating time and heated-sheared treatment, 60-120min heating was necessary for heated specimens to obtain similar cold water solubility and degree of depolymerization of heated-sheared specimens. These results conducted that heated-sheared treatment strongly promoted the depolymerization of low moist starches under high temperature as compared with heated treatment only. From the results of λmax of iodine-polysaccharide complex, there was almost same molecular state between heated for longer time and heated-sheared treatment. Both amylose and amylopectin depolymerized into lower molecule by both treatments.

Original languageEnglish
Pages (from-to)2-5
Number of pages4
JournalStarch/Staerke
Volume49
Issue number1
DOIs
Publication statusPublished - Jan 1997

All Science Journal Classification (ASJC) codes

  • Food Science
  • Organic Chemistry

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