Relationship between pulp structure breakdown and nutritional value of papaya (Carica papaya) and strawberry (Fragaria x ananassa) nectars using alternative thermal and non-thermal processing techniques

Jeffrey G. Swada, Christopher J. Keeley, Mohammad A. Ghane, Nicki J. Engeseth

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND: Papaya and strawberry contain a wide array of nutrients that contribute to human health; however, availability of these fruits is limited due to their short shelf lives and seasonal nature. In this study, the effect of alternative techniques including ultra high temperature (UHT, 20-135°C, 1-3s) and irradiation (0-10 kGy) on carotenoid concentration, antioxidant capacity and changes to pulp structure using transmission electron microscopy were determined for papaya and strawberry nectars. RESULTS: UHT had moderate effects on antioxidant capacity, but the greatest overall release of carotenoids from the pulp matrix (34.2%, 6.26%, 8.31%; β-cryptoxanthin, β-carotene, and lycopene, respectively). Irradiation resulted in the greatest increase in antioxidant capacity [19.22 to 24.32μmol Trolox equivalents kg-1 (papaya), 190.51 to 287.68μmol Trolox equivalents kg-1 (strawberry)], with moderate effects on carotenoid concentration. CONCLUSION: This research demonstrates that decreases in nutrient value and antioxidant capacity can result from processing, but that regeneration of these losses can be seen corresponding to the apparent breakdown of pulp structure.

Original languageEnglish (US)
Pages (from-to)2514-2523
Number of pages10
JournalJournal of the Science of Food and Agriculture
Volume96
Issue number7
DOIs
StatePublished - May 1 2016

Keywords

  • Antioxidant
  • Carotenoid
  • Nutrient value
  • ORAC
  • Pulp structure breakdown
  • TEM

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Agronomy and Crop Science
  • Nutrition and Dietetics

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