Effect of gelatinization degree on emulsification capacity of corn starch esterified with octenyl succinic acid

Madai Lopez-Silva, Edith Agama-Acevedo, Hernani Yee-Madeira, Luis A. Bello-Perez, Jose Alvarez-Ramirez

Research output: Contribution to journalArticlepeer-review

Abstract

Normal corn starch (∼26% amylose content) was subjected to different degrees of extrusion-based pregelatinization (55, 75, and 95%) to improve the efficiency of octenyl succinic anhydride (OSA) esterification. The partial disruption of the native semi-crystalline structure was verified with X-ray diffraction and Fourier transform infrared analysis. It was found that partial gelatinization (pregelatinization) reduced the relative crystallinity, which is an effect that was magnified by OSA esterification. Polarized and scanning electron microscopies revealed gradual destruction of the starch granules, yielding a fraction of insoluble remnants for high gelatinization degrees. The emulsification index showed a marked increase of about 18% by single extrusion treatment. However, fully stable emulsions (emulsification index = 1.0) were obtained by dual extrusion-esterification treatment. The hardness of hydrogels was reduced by pregelatinization. Principal component analysis revealed that most starch characteristics were mutually interdependent and that the impact of gelatinization degree was independent of the impact of OSA esterification.

Original languageEnglish
Article number131657
JournalFood Chemistry
Volume375
DOIs
StatePublished - 1 May 2022

Keywords

  • Corn starch
  • Emulsification index
  • Functional characteristics
  • OSA esterification
  • Pregelatinization

Fingerprint

Dive into the research topics of 'Effect of gelatinization degree on emulsification capacity of corn starch esterified with octenyl succinic acid'. Together they form a unique fingerprint.

Cite this