Determination of lipid and phenolic fraction in two hazelnut (Corylus avellana L.) cultivars grown in Poland

The fatty acid, tocopherol, sterol, phospholipid and phenolic compositions of Polish hazelnuts (Katalonski and Webba Cenny) were examined. Particularly, free + esterified and bound tocopherol, sterol and phenolic compounds were determined. The major fatty acids found in hazelnuts were oleic and linoleic acids. alpha-Tocopherol was the most abundant tocopherol accounting for 90-92% of the total content. Bound tocopherols represented 45.5% and 21.7% of total tocopherols in Katalonski and Webba Cenny cultivar, respectively. Total free + esterified sterols were between 62.0% and 75.7% of total sterols and B-sitosterol was the first sterol in the two samples. Phosphatidylcholine was the most common phospholipid, accounting for 72.2% for Katalonski and 67.5% Webba Cenny, respectively. The most abundant fatty acids in the phospholipid fraction were oleic equally with palmitic acids. Twelve free and six bound phenolic compounds were identified and quantified in hazelnut kernel, instead nine free and six bound phenolic compounds were determined in hard shell. (C) 2014 Elsevier Ltd. All rights reserved.