Journal
FOOD CHEMISTRY
Volume 221, Issue -, Pages 107-113Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.10.067
Keywords
Technological innovation; Cooling treatment; Heat exchanger; Olive oil quality; Polyphenols; Volatile compounds
Funding
- Alfa Laval SpA (Tavarnelle Val di Pesa, Florence, Italy)
- Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR), Italy (Project CLUSTER CL.A.N.-Agrifood AREA1 - Nutrizione e Salute Pros.IT) [CTN01_00230_413096]
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In recent years, the temperature of processed olives in many olive-growing areas was often close to 30 degrees C, due to the global warming and an early harvesting period. Consequently, the new trends in the extraction process have to include the opportunity to cool the olives or olive paste before processing to obtain high quality EVOO. A tubular thermal exchanger was used for a rapid cooling treatment (CT) of olive paste after crushing. The results did not show a significant difference in the oil yield or any modifications in the legal parameters. The cooling process determined a significant improvement of phenolic compounds in all the three Italian cultivar EVOOs analyzed, whereas the volatile compounds showed a variability largely affected by the genetic origin of the olives with C-6 aldehydes that seem to be more stable than C-6 alcohols and esters. (C) 2016 Elsevier Ltd. All rights reserved.
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