Naslov
Influence of climate, varieties and production process on tocopherols, plastochromanol-8 and pigments in flaxseed oil

Autori
Obranović, Marko ; Škevin, Dubravka ; Kraljić, Klara ; Pospišil, Milan ; Neđeral, Sandra ; Blekić, Monika ; Putnik, Predrag

Izvornik
Food technology and biotechnology (1330-9862) 53 (2015), 4; 496-504

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kratko priopcenje, znanstveni

Ključne riječi
flaxseed oil; variety; cold pressed; conditioning; tocopherols; plastochromanol-8; carotenoids; chlorophyll; climate

Sažetak
The objective of this study was to compare the influence of: genotype, environmental conditions and processing methods on levels of tocochromanols carotenoids and chlorophyll after maturation and harvesting in flaxseed oil from four varieties (Altess, Biltstar, Niagara and Oliwin). Oils were produced by cold pressing of dry seeds and seeds that were heated for 30 min at 60 °C. Temperature, sunshine and rainfall were primary environmental conditions included. Grand mean for γ-tocopherol was (522±29) mg/kg of oil, for plastochromanol-8 was (305±2) mg/kg of oil and total tocochromanols (831±3) mg/kg of oil. The highest levels and strongest antioxidant activity were found with cold pressed oil from variety Biltstar. Levels of γ-tocopherol and plastochromanol-8, increased with average temperature and total sunshine during seed maturation and decreased with total rainfall during seed maturation. Fifth week after flowering was identified as maturation period with best climate conditions to achieve optimal tocochromanol content. Grand mean for carotenoids was (1.83±0.01) mg/kg of oil, and chlorophyll (0.43±0.10) mg/kg of oil. Variety Altess had the highest levels of pigments. Antioxidant activity decreased with increase of chlorophyll, while correlations with carotenoids were not determined. Generally, oils obtained by cold pressing had higher levels of tocochromanols but lower values of pigments than oils after seed conditioning with similar antioxidant activity. The results from this study contribute to identifying the best flaxseed variety with regards to oil production and the highest antioxidant activity and nutritive value, and provide better understanding of tocochromanol biosynthesis in regard to different climate conditions.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA