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

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...

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Autores principales: Zaro, María José, Chaves, Alicia Raquel, Vicente, Ariel Roberto, Concellón, Analía
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Química
Quality
Antioxidants
Peroxidase
Polyphenol oxidase
Hydrogen peroxide
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/97241
https://ri.conicet.gov.ar/11336/33102
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-97241
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Quality
Antioxidants
Peroxidase
Polyphenol oxidase
Hydrogen peroxide
spellingShingle Química
Quality
Antioxidants
Peroxidase
Polyphenol oxidase
Hydrogen peroxide
Zaro, María José
Chaves, Alicia Raquel
Vicente, Ariel Roberto
Concellón, Analía
Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
topic_facet Química
Quality
Antioxidants
Peroxidase
Polyphenol oxidase
Hydrogen peroxide
description 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.
format Articulo
Articulo
author Zaro, María José
Chaves, Alicia Raquel
Vicente, Ariel Roberto
Concellón, Analía
author_facet Zaro, María José
Chaves, Alicia Raquel
Vicente, Ariel Roberto
Concellón, Analía
author_sort Zaro, María José
title Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
title_short Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
title_full Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
title_fullStr Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
title_full_unstemmed Distribution, stability and fate of phenolic compounds in white and purple eggplants (Solanum melongena L.)
title_sort distribution, stability and fate of phenolic compounds in white and purple eggplants (solanum melongena l.)
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/97241
https://ri.conicet.gov.ar/11336/33102
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