BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Influence of a heat-shock pre-treatment on wound-induced phenolic biosynthesis as an alternative strategy towards fresh-cut carrot processing

Participants in the publication
Carla Alegria (Author)
cE3c/FCUL
Elsa M Gonçalves (Author)
INSTITUTO NACIONAL DE INVESTIGAÇÃO AGRÁRIA E VETERINÁRIA, I.P.
Margarida Moldão-Martins (Author)
INSTITUTO SUPERIOR DE AGRONOMIA
Marta Abreu (Author)
INSTITUTO NACIONAL DE INVESTIGAÇÃO AGRÁRIA E VETERINÁRIA, I.P.

Summary
In fresh-cut vegetables, plant tissues are often challenged by (a)biotic stresses that act in combination, and the\nresponse to combinatorial stresses differs from that triggered by each individually. Phenolic induction by\nwounding is a known response contributing to increase products phenolic content. Heat application is a\npromising treatment in minimal processing, and its interference on the wound-induced response is\nproduce-dependent. In carrot, two-combined stress effects were evaluated: peel removal vs. shredding,\nand heat application (100
C/45 s) vs. shredding, on changes in total phenolic content (TPC) during 10\ndays (5
C). By applying the first stress combination, a decrease in TPC was verified on day 0 (50%),\nascribed to the high phenolic content of peels. Recovery of initial fresh carrot levels was achieved after 7\ndays owing to phenolic biosynthesis induced by shredding. For the second combination, changes in TPC,\nphenylalanine-ammonia-lyase (PAL), and peroxidase (POD) activity of untreated (Ctr) and heat-treated (HS)\npeeled shredded carrot samples were evaluated during 10 days. The heat-shock did not suppress phenolic\nbiosynthesis promoted by PAL, although there was a two-day delay in TPC increments. Notwithstanding,\nphenolic accumulation after 10 days exceeded raw material TPC content. Also, the decrease in POD activity\n(30%) could influence quality degradation during storage.


Where published
Food Science and Technology International

Publication Identifiers
ISSN - 1082-0132

Publisher
SAGE Publications



Document Identifiers
DOI - https://doi.org/10.1177/10820132211020837
URL - http://dx.doi.org/10.1177/10820132211020837

Keywords
Daucus carota L. heat-shock shredding phenolic synthesis PAL activity

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