Estimating hydroxytyrosol-tyrosol derivatives amounts in cv. Cobrancosa olive oils based on the electronic tongue analysis of olive paste extracts

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Marx, IMG (Author) Other; Susana Casal (Author) FFUP; Rodrigues, N (Author) Other; Veloso, ACA (Author) Other; Pereira, JA (Author) Other; Peres, AM (Author) Other

Journal

Title: LWT - Food Science and Technology

Vol. 147

ISSN: 0023-6438

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 3 Citations

Other information

Authenticus ID: P-00T-TXV

DOI: 10.1016/j.lwt.2021.111542

Abstract (EN): The estimation of hydroxytyrosol-tyrosol derivatives amounts in olive oils through the analysis of olive pastes collected during malaxation is of utmost relevance due to the relationship with the oils' health claim regarding the protection of blood lipids from oxidative stress. Olive pastes were collected during the industrial extraction of cv. Cobrancosa oils (0-60 min; 22-34 degrees C). Total phenolic contents of pastes' extracts were assessed (2800-5400 mg GAE/kg paste). Oils were laboratory-extracted from each paste and, after acid hydrolysis, the contents of hydroxytyrosol and tyrosol derivatives as their sum were determined (25-135, 62-120 and 68-255 mg/kg oil). Olive paste extracts were analyzed with a lab-made potentiometric electronic tongue. The device enabled estimating the total phenolic contents of the pastes (internal-validation: correlation coefficient 392 mg GAE/kg). Moreover, the electronic tongue allowed a more satisfactory indirect estimation of the total secoiridoids derivatives amounts of the oils (internal-validation: correlation coefficient 0.91, root mean square error < 25 mg/kg), based on the olive pastes' potentiometric profiles, without requiring the oils' posteriori invasive/destructive analysis. Thus, the electronic tongue could be foreseen as a potential tool for anticipating the health claim fulfilment during oils industrial extraction.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8