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Content of carotenoids, tocopherols, sterols, triterpenic and aliphatic alcohols, and volatile compounds in six walnuts (Juglans regia L.) varieties

Abdallah, Ikram Bou, Tlili, Nizar, Martinez-Force, Enrique, Rubio, Ana Gracia Pérez, Perez-Camino, Maria Carmen, Albouchi, Ali, Boukhchina, Sadok
Food chemistry 2015 v.173 pp. 972-978
Juglans regia, beta-carotene, beta-sitosterol, campesterol, gamma-tocopherol, hexanols, lutein, oils, seeds, statistical analysis, volatile compounds, walnuts
The aim of this work was to study the content of tocopherols, sterols, triterpenic and aliphatic alcohols, carotenoids, and volatile compounds in the kernel oils from six walnut (Juglans regia L.) varieties. The levels of β-carotene ranged between 0.22 and 0.62mg/kg, followed by lutein (0.01–0.06mg/kg). The total content of tocopherol ranged from 186.5 to 436.2mg/kg of the extracted oil and the major isoform in all samples was γ-tocopherol. The most abundant phytosterol was β-sitosterol (974–1494mg/kg) followed by campesterol then Δ-5-avenasterol. The major triterpenic alcohol was cycloartenol (226.4–532.1mg/kg). Hexacosanol (9.71–28.15mg/kg) was the major aliphatic alcohol. The detected volatile compounds were pentanal, hexanal, nonanal, 2-decenal and hexanol. The statistical analysis showed significant differences between varieties, which are probably due to genetic factors.