Varietal and crop year effects on lipid composition of walnut (Juglans regia) genotypes |
| |
Authors: | Marcela L. Martínez Miguel A. Mattea Damián M. Maestri |
| |
Affiliation: | (1) Facultad de Ingeniería, Universidad Nacional de Río Cuarto, CONICET, 5800 Río Cuarto, Argentina;(2) Instituto Multidisciplinario de Biología Vegetal (IMBIV, CONICET, UNC), Cátedra de Química Orgánica, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611-Ciudad Universitaria, X5016GCA Córdoba, Argentina |
| |
Abstract: | The FA, unsaponifiable, and volatile constituents of oil from three walnut varieties from two consecutive crop years were studied. The walnut oils (WO) were rich in PUFA and low in saturated FA. The tocopherol fraction consisted mainly of γ-tocopherol. High contents of β-sitosterol were found, together with campesterol and Δ5-avenasterol in similar amounts. Methylsterols present in WO were identified as cycloartenol, cyclolaudenol, cycloeucalenol, and 24-methylenecycloartanol. The hydrocarbon fraction was characterized by the predominance of C14–C20 n-alkanes. The major volatiles were aldehydes produced through the linoleic acid oxidative pathway. FA, methylsterols, and some hydrocarbons presented statistically significant differences among varieties. Most of this variation was due to the genotype. The Franquette variety was noteworthy by its higher oil and oleic acid contents. In contrast, tocopherols and volatile compounds showed minor differences among varieties; they were strongly influenced by the crop year. Chemical data were subjected to principal component analysis. The parameters that gave the greatest discrimination between the walnut varieties were oleic and linolenic acids, tetradecane, eicosane, tetracosane, cycloartenol, and 24-methylenecycloartanol. These components presented the major varietal influences and could be useful to determine the identity of walnut genotypes. |
| |
Keywords: | Chemical markers Juglandaceae Juglans regia oil composition walnut genotypes |
本文献已被 SpringerLink 等数据库收录! |
|