In the oil sector, a novelty in the centrifugal extraction system is represented by the multi-phase decanters (DMF) that work without adding process water and with the advantage of recovering a dried pomace and a by-product, called “pâté”, consisting of the pulp and its vegetation water, without traces of stone. The pâté has a high content of phenolic compounds, mainly represented by secoiridoids and verbascoside. The present work investigated the efficacy of two different ways of debittering (by sequential filtrations and spontaneous fermentation) of DMF pâté from three olive cultivars (Olea europaea L. “Leccino”, “Carboncella” and “Tortiglione”) to make the pâté edible, and, contemporary, investigated also the effect of its phenolic bioactive extracts on pathogenic bacteria and colon cancer cell model. Daily filtrations of pâté of the three cultivars have been shown to be more efficient in phenolic degradation. The activity of the indigenous microflora on the other hand takes a longer time to degrade the phenolic component and therefore to de-bitter it. None of pâté showed antibacterial activity. Colorimetric assay MTS for cell viability and metabolic activity tested on colon cancer cells Caco-2 and HCT116 suggest a potential beneficial effect of the dried extracts probably related to the modulation of gene expression under these treatments.
Seven cultivars of extra‐virgin olive oils (EVOOs) with different contents of natural antioxidants were analysed to evaluate the influence of storage time on EVOO quality. The EVOOs were stored in 1‐L‐volume green glass bottles at room temperature (15–18 °C) and with the same area of exposure to air. The main chemical, physicochemical, and sensory characteristics related to quality were determined for these EVOOs every 2 months, over a total period of 12 months. Under these storage conditions, all of the EVOOs showed gradual loss of quality. Based on these EVOO characteristics, the shelf‐life was approximated to between 10 and 12 months, which is a lot shorter than the 18 months that is currently used for the expiry period. Moreover, this study developed an analytical method to predict the remaining shelf‐life of individual marketed EVOOs. This is based on statistical analysis of the accurate analytical data for the EVOOs.
Practical applications
An accurate mathematical model available for the prediction of the shelf‐life of packaged EVOOs is a useful tool, not only for the producing companies, but also for governments and, in particular, the general public. Shelf‐life testing also allows the companies to minimize their production and packaging costs.
The development of innovative technologies in the mechanical extraction process of extra virgin olive oil can improve its quality standards through the modulation of physical, chemical and biochemical processes. Extra virgin olive oil quality and varietal differentiation are influenced by many factors, particularly the extraction. The use of ultrasound technology in the extraction process does not affect the quality, the composition, and the thermal properties of the oil, facilitating its separation from solids, and it allows the release of active compounds from the olive paste, with a positive influence on the phenolic content. In this study, the impact of ultrasound technologies was evaluated on merceological parameters, quality profile, and organoleptic features of extra virgin olive oils extracted from whole and destoned olives of the three main Italian cultivars (i.e., Peranzana, Canino, and Coratina). The parameters analyzed were influenced by both genotype and treatment, in particular, sonication did not lead to significant changes in the nutraceutical profile of the oils. The de-stoned olives were able to determine a great improvement of oil quality both for phenolic and volatile composition with a significant enhancement of health and sensory properties of the product.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.