Naslov
Antioxidants, radical-scavenging and protein carbonylation inhibition capacity of six monocultivar virgin olive oils in Istria (Croatia)

Autori
Koprivnjak, Olivera ; Kriško, Anita ; Valić, Srećko ; Carić, Dejana ; Krapac, Marin ; Poljuha, Danijela

Izvornik
Acta alimentaria (0139-3006) 45 (2016), 3; 427-433

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, prethodno priopćenje, znanstveni

Ključne riječi
virgin olive oil; ortho-diphenols; tocopherols; antioxidant capacity; protein carbonylation

Sažetak
Six monocultivar virgin olive oils (VOOs) produced from five autochthonous (Buža, Buža Puntoža, Istarska Bjelica, Porečka Rosulja and Rosinjola), and one referent cultivar (Leccino), were investigated. The mass fractions of ortho-diphenols (ORT) and tocopherols (TOC) were analyzed by VIS spectroscopy and HPLC. The radical-scavenging capacity was evaluated by electron spin resonance spectroscopy (ESR) using galvinoxyl free radical and the DPPH test. Results revealed a high level of total TOC in VOOs of Buža Puntoža (243 mg/kg) and Porečka Rosulja (325 mg/kg). VOOs contained in 100 g from 79% (Istarska Bjelica) to 261% (Porečka Rosulja) of recommended daily allowance of α-tocopherol. The mass fraction of ORT in Istarska Bjelica and Rosinjola was >250 mg/kg (on average 30-40% higher in comparison to other studied cultivars). Istarska Bjelica and Porečka Rosulja showed the highest antioxidant capacity in both methods of measurement. The highest capacity to inhibit protein carbonylation (PC) in response to oxidative stress (54-56%) displayed Buža Puntoža, Leccino and Buža. High level of positive linear correlation between ORT mass fraction and radical-scavenging capacity measured by DPPH test (r = 0.768), as well as strong negative correlation between PC inhibition and mass fraction of ORT (r = -0.697), were observed.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija), Prehrambena tehnologija

Napomena
Kao Online First 27.5.2015.

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