Naslov
Quality of rapeseed oil produced by conditioning seeds at modest temperatures

Autori
Kraljić, Klara ; Škevin, Dubravka ; Pospišil, Milan ; Obranović, Marko ; Neđeral, Sandra ; Bosolt, Tina

Izvornik
Journal of the American Oil Chemists' Society (0003-021X) 90 (2013), 4; 589-599

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
rapeseed oil; conditioning; pressing; fatty acids; sterols; tocopherols; phenols; canolol

Sažetak
Conditioning rapeseed can significantly increase the amount of bioactive compounds in the crude oil, but if the conditioning temperatures are too high, they can cause unwanted side effects such as darker color and sensory defects. Modest conditioning temperatures may be more suitable, but little is known about the effects on the quality and bioactive composition of the resulting oil. Oil was recovered from five rapeseed cultivars by cold pressing (CP) or by pressing seeds conditioned at 80 C for 30 min (HP). Conditioning rapeseed increased oil yield without changing fatty acid composition and increased the amount of total sterols by 16 %, total tocopherols by 20 %, and the levels of polyphenols. Levels of the polyphenol canolol were up to 55-fold higher in HP oil than in CP oil. These higher levels of bioactive compounds gave HP oil higher radical scavenging activity. Although HP oil also had higher free fatty acid contents, peroxide levels, and specific UV extinctions (K values). The quality parameters of HP and CP oils were within codex limits indicating high quality. Modest conditioning temperatures can be used to produce rapeseed oil with high quality and radical scavenging activity.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

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