Effect of the Storage Conditions and Freezing Speed on the Color and Chlorophyll Profile of Premium Extra Virgin Olive Oils
View/Open
Author
Díez-Betriu, Anna
Bustamante, Julen
Tres, Alba
Vichi, Stefania
Guardiola, Francesc
Publication date
2023-01-03ISSN
2304-8158
Abstract
Premium extra virgin olive oils (PEVOO) are oils of exceptional quality and retail at high prices. The green color of recently extracted olive oils is lost during storage at room temperature, mainly because of the pheophytinization of chlorophylls. Since a green color is perceived as a mark of high-quality oils by consumers, it is especially important for PEVOO to maintain their initial green color. This study assessed the effect of applying low temperatures (refrigeration and freezing) and modified atmospheres on the color of four PEVOO for 24 months. Also, the effect of two freezing methods (slow freezing by placing the oil at −20 ◦C and fast freezing by immersing the oil in a bath of liquid nitrogen) was studied. Results showed that the green color was better preserved in oils frozen and stored at −20 ◦C whereas in oils frozen with liquid nitrogen the green color was lost much faster during frozen storage. An in-depth study of this unexpected phenomenon showed that this loss of green color was mainly due to a pheophytinization of chlorophylls. This phenomenon did not happen at the moment of freezing with liquid nitrogen, but over the first 100 days of storage at −20 ◦C. In addition, correlations between single chlorophyll and pheophytin contents and chromatic coordinates were established.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
663/664 - Food and nutrition. Enology. Oils. Fat
Pages
11
Publisher
MDPI
Is part of
Foods
Citation
Díez-Betriu, Anna, Julen Bustamante, Agustí Romero, Antonia Ninot, Alba Tres, Stefania Vichi, and Francesc Guardiola. 2023. "Effect Of The Storage Conditions And Freezing Speed On The Color And Chlorophyll Profile Of Premium Extra Virgin Olive Oils". Foods 12 (1): 222. doi:10.3390/foods12010222.
Grant agreement number
MINECO/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/RYC‑2017‑23601/ES/ /
Program
Fructicultura
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2549]
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/