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Artículo

Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)

Zaro, Maria JoseIcon ; Chaves, Alicia RaquelIcon ; Vicente, Ariel RobertoIcon ; Concellón, AnalíaIcon
Fecha de publicación: 06/2014
Editorial: Elsevier Science
Revista: Postharvest Biology and Technology
ISSN: 0925-5214
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Alimentos y Bebidas

Resumen

Eggplants rank among the vegetables richest in antioxidants, but little is known about the allocation, stability, and turnover of these metabolites. The distribution, accumulation and degradation of phenolic antioxidants in the inner and outer pulp of two commercially important eggplant types (white and dark purple), at harvest and after 14 and 30 d of refrigerated storage under non-chilling conditions (10 °C and 90% RH) were determined in this study. Chlorogenic acid (ChA) was histolocalized by fluorescence with 2-aminoethyl-diphenylborinate and the activity of phenolic compounds oxidizing enzymes (polyphenoloxidase, PPO and peroxidase, POD) as well as H2O2 concentration in both fruit regions was determined. During storage, dark purple fruit were more susceptible to dehydration and showed greater deterioration than white eggplants. Both genotypes accumulated higher sugar content in the inner pulp as opposed to acids, which were more concentrated in the outer region. At harvest, pulp antioxidant capacity was similar in both eggplant types. TEAC and DPPHassays and in situ localization, showed greater total antioxidants and ChA content in the core than in the outer pulp in both white and dark purple fruit. The stability of ChA was markedly different between genotypes. In white fruit, antioxidants increased during the first two weeks of storage, remaining stable afterwards. In contrast, in dark purple eggplants, phenolic compounds declined after an initial stage at which they accumulated. PPO and POD in vitro activities, associated mainly with fruit seeds, fibers, and vascular bundles did not correlate with pulp browning or loss of phenolic antioxidants. Instead, the reduction of ChA in the core of dark purple fruit was associated with increased production of H2O2. Results indicate that antioxidants are predominantly located in the inner pulp of eggplants regardless of the genotype, but are more stable in white fruit. Rather than being the result of browning reactions, substantial losses of phenolic antioxidants in whole eggplants under the recommended storage conditions likely result from seed coat development and vascular lignification in the immature fruit.
Palabras clave: ANTIOXIDANTS , HYDROGEN PEROXIDE , PEROXIDASE , POLYPHENOL OXIDASE , QUALITY
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/33102
DOI: http://dx.doi.org/10.1016/j.postharvbio.2014.01.016
URL: http://www.sciencedirect.com/science/article/pii/S0925521414000246
Colecciones
Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Citación
Zaro, Maria Jose; Chaves, Alicia Raquel; Vicente, Ariel Roberto; Concellón, Analía; Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.); Elsevier Science; Postharvest Biology and Technology; 92; 6-2014; 70-78
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