Characterization of waxy starches phosphorylated using phytic acid

Eun Young Park, Seung Taik Lim

Research output: Contribution to journalArticle

Abstract

Waxy maize and waxy rice starches were subjected to dry heating in the presence of phytic acid at 120 °C for 6 or 24 h under alkaline conditions to induce phosphorylation. Dry heating at 120 °C for 24 h with phytic acid increased the residual phosphorus content of waxy maize and waxy rice starches from 11.5 to 92.9 ppm and from 27.5 to 79.3 ppm, respectively. 31P Nuclear magnetic resonance (NMR) analysis revealed the presence of monostarch monophosphate in the treated starches. The pasting viscosity of the starches was substantially changed by the phosphorylation, showing increases in peak viscosity, breakdown, and setback viscosity, but decrease in pasting temperature. Paste clarity and swelling power also increased after phosphorylation. Reduced melting temperature and enthalpy were observed for the phosphorylated starches. Thus, phytic acid is an effective reagent for phosphorylating starch to improve its pasting properties.

Original languageEnglish
Article number115225
JournalCarbohydrate Polymers
Volume225
DOIs
Publication statusPublished - 2019 Dec 1

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Phytic Acid
Starch
Phosphorylation
Acids
Viscosity
Heating
Ointments
Phosphorus
Swelling
Melting point
Enthalpy
Nuclear magnetic resonance

Keywords

  • Dry heating
  • Phosphorylation
  • Phytic acid
  • Starch

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Characterization of waxy starches phosphorylated using phytic acid. / Park, Eun Young; Lim, Seung Taik.

In: Carbohydrate Polymers, Vol. 225, 115225, 01.12.2019.

Research output: Contribution to journalArticle

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AB - Waxy maize and waxy rice starches were subjected to dry heating in the presence of phytic acid at 120 °C for 6 or 24 h under alkaline conditions to induce phosphorylation. Dry heating at 120 °C for 24 h with phytic acid increased the residual phosphorus content of waxy maize and waxy rice starches from 11.5 to 92.9 ppm and from 27.5 to 79.3 ppm, respectively. 31P Nuclear magnetic resonance (NMR) analysis revealed the presence of monostarch monophosphate in the treated starches. The pasting viscosity of the starches was substantially changed by the phosphorylation, showing increases in peak viscosity, breakdown, and setback viscosity, but decrease in pasting temperature. Paste clarity and swelling power also increased after phosphorylation. Reduced melting temperature and enthalpy were observed for the phosphorylated starches. Thus, phytic acid is an effective reagent for phosphorylating starch to improve its pasting properties.

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