INVESTIGADORES
MAESTRI Damian Modesto
artículos
Título:
Varietal and crop year effects on lipid composition of walnut (Juglans regia) genotypes
Autor/es:
MARCELA MARTÍNEZ; MIGUEL MATTEA; DAMIÁN MAESTRI
Revista:
Journal of the American Oil Chemists´ Society
Editorial:
AOCS PRESS
Referencias:
Año: 2006 vol. 83 p. 791 - 796
Resumen:
The fatty acids, unsaponifiable and volatile constituents of three walnut oil (WO) varieties from two consecutive crop years were studied. The oils were found to be rich in polyunsaturated fatty acids, and low in saturated ones. The tocopherol fraction consisted mainly of g-tocopherol. High contents of â-sitosterol were found, together with campesterol and Ä5-avenasterol in similar amounts. Methylsterols present in WO were identified as cycloartenol, cyclolaudenol, cycloeucalenol and 24-methylenecycloartanol. Hydrocarbon fraction was characterized by the predominance of C14 – C20 n-alkanes. The major volatiles were aldehydes produced through the oxidative pathway of the linoleic acid. Fatty acids, methylsterols and some hydrocarbons presented statistically significant differences among varieties. Most of this variation was due to the genotype. Franquette variety was noteworthy by its higher oil and oleic acid contents. On the contrary, 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 influence and could be useful to determine the identity of walnut genotypes.