Vitamin C and organic acid contents in Spanish “Gazpacho” soup related to the vegetables used for its elaboration process Contenidos de vitamina C y ácidos orgánicos en Gazpacho y en las hortalizas usadas en su elaboración
Open Access
- 21 April 2011
- journal article
- research article
- Published by Taylor & Francis in CyTA - Journal of Food
- Vol. 9 (1) , 71-76
Abstract
The contents of vitamin C (ascorbic and dehydroascorbic acids) and other organic acids such as citric, oxalic, fumaric, malic and glutamic, were determined by HPLC in 54 samples of tomato, white onion, cucumber, pepper, garlic, and “gazpacho” elaborated using the previous vegetables. Tomato and garlic had the highest amounts of organic acids, while cucumber presented the lowest content. Citric and glutamic acids presented the highest mean concentrations. The bulb vegetables presented higher concentrations of glutamic and citric acids than the fruit vegetables. Pepper was the vegetable with the highest content of vitamin C, followed by tomato and “gazpacho”. Mean value of ascorbic acid/dehydroascorbic acid ratio varied between 0.29 and 2.53 for cucumber and tomato, respectively. “Gazpacho” samples had a lower ascorbic acid/dehydroascorbic acid ratio than the vegetables used in its elaboration, which suggests that some amount of ascorbic acid may be enzymatically oxidized to dehydroascorbic during the elaboration. Se determinaron los contenidos de vitamina C (ácidos ascórbico y deshidroascórbico) y otros ácidos orgánicos como cítrico, oxálico, fumárico, málico y glutámico, por HPLC, en 54 muestras de tomate, cebolla blanca, pepino, pimiento, ajo y “gazpacho” elaborado a partir de estos vegetales. Tomate y ajo fueron los que presentaron mayores contenidos de ácidos orgánicos, mientras que en pepino se encontró el menor contenido. Los ácidos orgánicos mayoritarios fueron cítrico y glutámico. Los bulbos presentaron las mayores concentraciones de ácidos glutámico y ácido cítrico de los frutos. El pimiento fue el vegetal que presentó los mayores contenidos de vitamina C, seguido de tomate y “Gazpacho”. La relación entre ácido ascórbico/ácido dehidroascórbico osciló entre 0,29 y 2,53 para pepino y tomate, respectivamente. Las muestras de “gazpacho” mostraron una relación ácido ascórbico/ácido dehidroascórbico inferior al de los vegetales usados en su elaboración, lo que sugiere que una cierta cantidad de ácido ascórbico se oxida enzimáticamente a dehidroascórbico durante su elaboración.Keywords
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