Phytate-mediated phosphorylation of maize, rice, and potato starches at different pH conditions

Ho Seok Jang, Jihyun Lee, Hyeon Jeong Lee, Eun Young Park

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Maize, rice, and potato starches were dispersed with phytate at pH 7, 9, and 11, and were subjected to dry-heating at 130 °C for 12 h. The residual phosphorus content and structural characteristics revealed that the treatment resulted in starch phosphorylation. Further, pasting viscosity, clarity, solubility, and swelling power were analyzed to determine the physicochemical properties of the phosphorylated starch. These heat-treated starches retained phosphorus mainly in the form of monostarch monophosphate. Phosphorylation increased the peak viscosity and decreased the pasting temperature in maize and rice starches, but not in potato starch. Paste clarity, solubility, and swelling power were also increased in phosphorylated maize and rice starches. Phosphorus content, paste clarity, solubility, and swelling power were the highest at pH 7, but the maximum paste viscosity was at pH 9. These results indicate that phytate can be used for starch phosphorylation, with the reaction efficiency based on the botanical source of the starch and the reaction pH.

    Original languageEnglish
    Pages (from-to)857-864
    Number of pages8
    JournalInternational Journal of Biological Macromolecules
    Volume165
    DOIs
    Publication statusPublished - 2020 Dec 15

    Bibliographical note

    Funding Information:
    This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government ( NRF-2018R1C1B6002974 ).

    Publisher Copyright:
    © 2020

    Keywords

    • Dry-heating
    • Phosphorylation
    • Phytate
    • Starch
    • pH

    ASJC Scopus subject areas

    • Structural Biology
    • Biochemistry
    • Molecular Biology

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