Related Experiment Video
Updated: May 22, 2025

Preparation of High-Quality Fermented Fish Product
Published on: August 23, 2019
Fermented olives (Olea europaea L.): A detailed insight into morphological changes and phenolic profile from harvest
Tea Burin1, Mariana Cecilia Grohar1, Jerneja Jakopic1
1University of Ljubljana, Biotechnical Faculty, Department of Agronomy, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
Abstract:
The aim of this research was to determine the changes in fruit quality parameters, antioxidant capacity and phenolic content during natural fermentation of five olive cultivars. During processing, the fruit weight and firmness decreased and dry matter increased in all cultivars. Nine phenolic compounds were studied in detail during natural fermentation for the first time. 'Istrska belica' have the highest contents of phenolics, which require the longest processing period. Oleuropein content decreased during processing in all cultivars, resulting in fruit browning, a decrease in antioxidant capacity and an increase in other derived phenolic compounds. We found that the contents of bitter phenolic compounds stabilized a few months before the end of processing and the bitter taste in the final products did not differ between cultivars, although their content varied between cultivars. Understanding phenolic variations during the olive processing could reduce processing time and increase phenolic content in the final product.
Related Concept Videos
Fermentation
Fermentation is a type of metabolic process that occurs in the absence of oxygen, where organic molecules such as glucose are broken down to produce energy. During this process, the...
Fates of Pyruvate
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
Gustation
Products of the Citric Acid Cycle
Preparation of Diols and Pinacol Rearrangement
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Pinocytosis

