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Microbial biodiversity of Sardinian oleic ecosystems

Santona, Mario and Sanna, Maria Lina and Multineddu, Chiara and Fancello, Francesco and Audijede la Fuente, Sara and Dettori, Sandro and Zara, Severino (2018) Microbial biodiversity of Sardinian oleic ecosystems. Food Microbiology, Vol. 70 , p. 65-75. ISSN 0740-0020. Article.

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DOI: 10.1016/j.fm.2017.09.004

Abstract

The olives are rich in microorganisms that, during the extraction process may persist in the oils and can influence their physicochemical and sensory characteristics. In this work, and for the first time, we isolated and identified microbial species, yeast and bacteria, present during the production process in four Sardinian (Italy) oleic ecosystems. Among these varieties, we found that Nera di Gonnos was associated to the highest microbial biodiversity, which was followed by Bosana, Nocellara del Belice and Semidana. Among the different microbial species isolated, some are specific of olive ecological niches, such as Cryptococcus spp and Serratia spp; and others to olive oils such as Candida spp and Saccharomyces. Some other species identified in this work were not found before in oleic ecosystems. The enzymatic analyses of yeast and bacteria showed that they have good β-glucosidase activity and yeast also showed good β-glucanase activity. The majority of bacteria presented lipolytic and catalase activities while in yeast were species-specific. Interestingly, yeast and bacteria isolates presented a high resistance to bile acid, and about 65% of the yeast were able to resist at pH 2.5 for 2 h. Finally, bacteria showed no biofilm activity compared to yeast.

Item Type:Article
ID Code:11918
Status:Published
Refereed:Yes
Uncontrolled Keywords:Yeast, bacteria, enzymatic activity, olive oil, biofilm, probiotics
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/03 Arboricoltura generale e coltivazioni arboree
Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Elsevier
ISSN:0740-0020
Deposited On:06 Feb 2018 13:02

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