Insoluble and soluble roasted walnut proteins retain antibody reactivity

Melanie L. Downs, Angela Simpson, Adnan Custovic, Aida Semic-Jusufagic, Joan Bartra, Montserrat Fernandez-Rivas, Steve L. Taylor, Joseph L. Baumert, E. N.Clare Mills

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Thermal processing techniques commonly used during food production have the potential to impact food allergens by inducing physical and/or chemical changes to the proteins. English walnuts (Juglans regia) are among the most commonly allergenic tree nuts, but little information is available regarding how walnut allergens respond to thermal processing. This study evaluated the effects of dry roasting (132 or 180°C for 5, 10, or 20 min) on the solubility and immunoreactivity of walnut proteins. A dramatic decrease in walnut protein solubility was observed following dry roasting at 180°C for 20 min. However, both the soluble and insoluble protein fractions from roasted walnuts maintained substantial amounts of IgG immunoreactivity (using anti-raw and anti-roasted walnut antisera), with similar patterns of reactivity observed for human IgE from walnut-allergic individuals. Thus, walnut proteins are relatively stable under certain thermal processing conditions, and IgE reactivity remains present even when insoluble aggregates are formed.

Original languageEnglish (US)
Pages (from-to)1013-1021
Number of pages9
JournalFood Chemistry
Volume194
DOIs
StatePublished - Mar 1 2016

Keywords

  • Food allergy
  • Thermal processing
  • Tree nut
  • Walnut

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

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