In the present work the effects of different brining treatments on mature table olives during natural fermentation were evaluated. The considered olive cultivars are typical of Sicily: Moresca and Giarraffa. They were harvested at pigmented state. The carpological data revealed their good quality as table olives. Natural fermentation was performed with or without acidification up to pH 4, and at 8% and 15% salt concentrations. The physical, chemical and microbiological changes in olives and brines were monitored throughout the processing period. The acidification affected and selected the microbial population and maintained the low pH necessary for the hygienic safety of the product. In fact, in Moresca brines,the lactic acid bacteria totally disappeared after 60 days of fermentation while in Giarraffa they maintained their presence in the brines up to 180 days with a value between 104 UFC/mL and 106 UFC/mL, depending on the salt concentration. The microbial population was also affected by the polyphenol content, which was different between the cultivars. The color of olive fruits was greatly influenced by acidification and less by salt concentration. The addition of salt showed a different influence on the studied cultivars, in fact only the chemical analyses of Giarraffa showed a significant difference between the two levels of salt concentration.

Effect of acidification and salt concentration on two black brined Sicily olives (cv moresca and giarraffa) / Romeo, Fv; Piscopo, A; Poiana, M. - In: GRASAS Y ACEITES. - ISSN 0017-3495. - 61:3(2010), pp. 251-260.

Effect of acidification and salt concentration on two black brined Sicily olives (cv moresca and giarraffa)

Piscopo A;Poiana M
2010-01-01

Abstract

In the present work the effects of different brining treatments on mature table olives during natural fermentation were evaluated. The considered olive cultivars are typical of Sicily: Moresca and Giarraffa. They were harvested at pigmented state. The carpological data revealed their good quality as table olives. Natural fermentation was performed with or without acidification up to pH 4, and at 8% and 15% salt concentrations. The physical, chemical and microbiological changes in olives and brines were monitored throughout the processing period. The acidification affected and selected the microbial population and maintained the low pH necessary for the hygienic safety of the product. In fact, in Moresca brines,the lactic acid bacteria totally disappeared after 60 days of fermentation while in Giarraffa they maintained their presence in the brines up to 180 days with a value between 104 UFC/mL and 106 UFC/mL, depending on the salt concentration. The microbial population was also affected by the polyphenol content, which was different between the cultivars. The color of olive fruits was greatly influenced by acidification and less by salt concentration. The addition of salt showed a different influence on the studied cultivars, in fact only the chemical analyses of Giarraffa showed a significant difference between the two levels of salt concentration.
2010
En el presente trabajo, los efectos de diferentes trata-mientos con salmuera en aceitunas de mesa maduras du-rante su fermentación natural fueron evaluados. Los cultivos de aceitunas considerados son típicos de Sicilia: Moresca y Giarraffa. Ellas son cosechadas en su estado maduro. Los datos carpológicos revelan su buena calidad como aceituna de mesa. La fermentación natural fue realizada con y sin aci-dificación hasta pH 4, y a una concentración de sal del 8% y 15%. Cambios físicos, químicos y microbiológicos de las aceitunas y salmueras a través de todo el proceso fue moni-torizado. La acidificación afectó y seleccionó la población mi-crobiana y mantuvo el pH bajo, necesario para la seguridad higiénica del producto. De hecho, en la salmuera de Moresca las bacterias lácticas desaparecieron totalmente después de 60 días de fermentación mientras que en Giarraffa, ellas mantuvieron su presencia en la salmuera hasta 180 días con un valor entre 104 UFC/mL y 106 UFC/mL, dependiendo de la concentración salina. La población microbiana fue afectada también por el contenido de fenoles, que fue diferente en los distintos cultivos. El color de los frutos de aceituna fue ma-yormente influenciado por la acidificación y menos por la concentración salina. La adición de sal mostro una influencia diferente en los cultivos estudiados; de hecho, solamente el análisis químico de Giarraffa mostro una diferencia significa-tiva entre los dos niveles de concentración salina.
Acidity
Brining
Naturally mature olives
Microbial growth
Salt
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/47307
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