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Microbiological and Physicochemical Changes in Natural Green Heat-Shocked Aloreña de Málaga Table Olives

AutorRodríguez-Gómez, Francisco J. ; Ruiz-Bellido, Miguel Á.; Romero-Gil, Verónica; Benítez-Cabello, Antonio; Garrido Fernández, A. ; Arroyo López, Francisco Noé
Palabras claveHeat treatment
Olive packaging
Sensory evaluation
Table olives
Metagenomic analysis
Fecha de publicación8-nov-2017
EditorFrontiers Media
CitaciónFrontiers in Microbiology 8: 2209 (2017)
ResumenPreserving the highly appreciated natural freshness of Aloreña de Málaga table olives and preventing their progressive darkening during processing is a major challenge. In this work, heat-shocked (60°C, 5 min) fruits were processed according to the three denominations referred to in the Protected Designation of Origen (cured, fresh green, and traditional) and their characteristics compared with those that followed the habitual industrial process (controls). The results revealed that the effects of the heat treatment on the evolution of pH, titratable acidity, salt, sugar, organic acid, ethanol content, texture, and color of fruits as well as on microbial populations (yeasts and lactic acid bacteria) were slight in the case of the fresh green and cured presentations. However, the differences between heat-shocked and its control were remarkable in the traditional process. Notably, the heat treatment favored lactic acid fermentation, retention of the green appearance of the fruits, stability during packaging, and led to the highest sensory evaluation. The metagenomic analysis carried out at the end of the fermentation revealed the presence in all samples of three genera (Lactobacillus, Pediococcus, and Celerinatantimonas) which encompassed most of the sequences. The number of Lactobacillus sequences was statistically higher (p ≥ 0.05) in the case of traditional heat-shocked fruits than in its control.
Descripción11 Páginas; 5 Tablas; 6 Figuras
Versión del editorhttps://dx.doi.org/10.3389/fmicb.2017.02209
URIhttp://hdl.handle.net/10261/157886
E-ISSN1664-302X
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