HMDSO plasma treatment as alternative to modify structural properties of granular starch

Israel Sifuentes-Nieves, Gonzalo Velazquez, Pamela C. Flores-Silva, Ernesto Hernández-Hernández, Guadalupe Neira-Velázquez, Carlos Gallardo-Vega, Guadalupe Mendez-Montealvo

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

In the present study, the effect of plasma treatment on the structural properties of three granular corn starches (normal, Hylon V and Hylon VII) was investigated. Thermal (TGA/DSC), structural (XRD/FTIR) and chemical (XPS) properties were evaluated. Plasma treatment resulted in partial evaporation of water molecules changing the organization level of the double helices in the crystalline lamellae. Moreover, XRD results suggested a decrease of the long-range crystallinity and suggested changes in amylose chains after treatments. The crosslinking of modified amylose chains measured by XPS analysis resulted in variations in the gelatinization parameters as well as in its heterogeneous crystalline structure. The results indicate that the type and extent of changes in the structure of plasma-treated corn starch depends on the distribution of the water molecules inside the crystalline regions (helical water) and on the amylose content. In addition, the obtained results indicated that plasma treatment is a suitable method to modify starch without any incorporation of new elements from hexamethyldisiloxane (HMDSO), which only promotes stronger interactions between the starch main components.

Original languageEnglish
Pages (from-to)682-689
Number of pages8
JournalInternational Journal of Biological Macromolecules
Volume144
DOIs
StatePublished - 1 Feb 2020
Externally publishedYes

Keywords

  • Cold plasma
  • Corn starch
  • Crosslinking

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