Publicação
Total phenolic compounds and antioxidant activity of Olive oils from Rio Grande do Sul, Brazil
| dc.contributor.author | Siqueira, Geisa | |
| dc.contributor.author | Soares, Geraldo | |
| dc.contributor.author | Lobo, Joana C. | |
| dc.contributor.author | Pinto, Edgar | |
| dc.contributor.author | Viegas, Olga | |
| dc.contributor.author | Pinto, Edgar | |
| dc.date.accessioned | 2026-07-10T14:34:36Z | |
| dc.date.available | 2026-07-10T14:34:36Z | |
| dc.date.issued | 2025-05 | |
| dc.description.abstract | Extra-virgin olive oil (EVOO) is a staple in global cuisine and a key component of the Mediterranean diet, valued for its health benefits associated with oleic acid and antioxidants. Brazil relies heavily on imported olive oil, facing high prices, potential adulteration, and limited data on local oil quality. Olive oil production is expanding in southern Brazil, particularly in Rio Grande do Sul (RGS), but comprehensive characterization remains limited. This study aimed to assess the total phenolic content (TPC), antioxidant capacity, and oxidative stability of EVOO from RGS (n=6) and compare them with the most commercially available EVOO in Brazil, of the Iberian-origin (n=3). Nine different EVOOs were purchased in triplicate from markets in RGS. Standard quality parameters (free acidity, peroxide value, K232, K270, and ΔK) were determined according to Regulation (EU) No 2022/2105. TPC (mg gallic acid equivalents - GAE/kg) and antioxidant activity (DPPH inhibition, %) were measured by spectrophotometry. Oxidative stability was assessed using the Rancimat method. All samples met EU quality standards. Statistically significant differences were observed for TPC, antioxidant activity, and oxidative stability, with Iberian EVOOs presenting lower values—TPC (76±15 vs. 147±24 mg GAE/kg), antioxidant activity (58.5±8.9 vs. 80.6±7.1 % [DPPH]), and oxidative stability (5.3±1.27 vs. 11.2±3.18 hours) for Iberian and RGS EVOOs, respectively. Several factors may contribute to the observed results, particularly storage time and conditions. Phenolic compounds degrade over time during storage. Given that the Iberian EVOOs were stored for a longer period (due to transport associated with the importation process), this may have led to a reduction in phenolic content and oxidative stability. These findings highlight the importance of chemical characterization and quality assessment of EVOOs available on the market. Further studies are needed to explore the impact of storage and processing conditions on EVOO composition. | eng |
| dc.identifier.citation | Siqueira, G., Soares, G., Lobo, J. C., Pinto, E., & Viegas, O. (2025). Total phenolic compounds and antioxidant activity of Olive oils from Rio Grande do Sul, Brazil. XXIV Congresso de Nutrição e Alimentação da Associação Portuguesa de Nutrição (APN) 2025 - Acta Portuguesa de Nutrição, 41, 113. https://actaportuguesadenutricao.pt/wp-content/uploads/2025/09/ACTA-41_LOW-2.pdf | |
| dc.identifier.issn | 2183-5985 | |
| dc.identifier.uri | http://hdl.handle.net/10400.22/32573 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Associação Portuguesa de Nutrição | |
| dc.relation.hasversion | https://actaportuguesadenutricao.pt/wp-content/uploads/2025/09/ACTA-41_LOW-2.pdf | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | |
| dc.subject | Olive oils | |
| dc.title | Total phenolic compounds and antioxidant activity of Olive oils from Rio Grande do Sul, Brazil | eng |
| dc.type | conference poster | |
| dspace.entity.type | Publication | |
| oaire.citation.conferenceDate | 2025-05 | |
| oaire.citation.conferencePlace | Braga | |
| oaire.citation.startPage | 113 | |
| oaire.citation.title | XXIV Congresso de Nutrição e Alimentação da Associação Portuguesa de Nutrição (APN) 2025 - Acta Portuguesa de Nutrição | |
| oaire.citation.volume | 41 | |
| oaire.version | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |
| person.familyName | Pinto | |
| person.givenName | Edgar | |
| person.identifier.ciencia-id | 271F-B7DF-8FAB | |
| person.identifier.orcid | 0000-0002-8021-4783 | |
| relation.isAuthorOfPublication | eaf9fc86-1a1c-437f-adee-d28040aa7f2f | |
| relation.isAuthorOfPublication.latestForDiscovery | eaf9fc86-1a1c-437f-adee-d28040aa7f2f |