Journal
FOOD CHEMISTRY
Volume 342, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128369
Keywords
High vacuum; Quality; Phenolic content; Volatile compounds; Flavor; off-flavor
Funding
- Alfa Laval Copenhagen A/S (Alfa Laval Copenhagen A/S, Soborg, Denmark)
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The study found that the application of high vacuum technology in the processing of virgin olive oil has significant effects on the physicochemical properties of the olive paste and oil, including improving the coalescence of oil droplets, increasing the phenolic content, and reducing some volatile molecules related to off-flavors in the oil.
High vacuum technology has been incorporated into a new assisted extraction system applied to virgin olive oil (VOO) processing, which was tested at a lab-scale pilot plant to evaluate its impact on the physicochemical properties of the olive paste and oil. The vacuum system induced changes in the mechanical and structural properties of the olive cells, improving the coalescence of the oil droplets due to substantial cellular and intracellular mass transfer during the process, as shown by cryo-scanning electron microscopy (Cryo-SEM) analysis. The effects on the quality characteristics of VOOs extracted from three cultivars at different malaxation temperatures were evaluated. A significant increase in the phenolic content, from 25.2% to 48.6%, was observed. The content of volatile compounds responsible for the VOO flavor decreased as a function of malaxation temperature. The reduction of some volatile molecules related to the VOO off-flavor (ethanol, ethyl acetate and acetic acid) was also shown.
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