Effect of ethanol, phytic acid and citric acid treatment on the physicochemical and heavy metal adsorption properties of corn starch

Se Rin Kim, Jae Young Park, Eun Young Park

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Corn starch dispersions were heated with ethanol (E) and reacted with phytic acid (E-PA), citric acid (E-CA), and a mixture of phytic and citric acid (E-PACA) under dry-heating to prepare heavy metal adsorbents. Microscopy images indicated that ethanol treatment induced the formation of porous structures on the surface; furthermore, treatment with phytic and citric acid induced indentations, pores, and irregular structures in E-PA, E-CA, and E-PACA starches. Phytic and citric acid were retained in the starch molecules through ester bonds with the phosphate and carboxyl groups, respectively. Starch esterification by phytic and citric acid induced a loss of crystallinity, high water absorption capacity, and low solubility. E-PACA starch exhibited more efficient Cu2+ adsorption (38.13 mg/g) than native, E, E-PA, and E-CA starches (0.11, 0.49, 2.05, and 36.23 mg/g, respectively). Thus, modification with ethanol, phytic acid and citric acid can be applied to prepare natural starch-based heavy metal adsorbents.

Original languageEnglish
Article number137167
JournalFood Chemistry
Volume431
DOIs
Publication statusPublished - 2024 Jan 15

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) [grant number NRF-2021R1A2C4001619 ]. This was also supported by a grant from Korea University.

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Adsorption
  • Citric acid
  • Heavy metal
  • Phytic acid
  • Starch

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

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