Tocopherol concentration in almond oil from Moroccan seedlings: Geographical origin and post-harvest implications

The concentration of the three main tocopherol homologs was determined in oil samples of almond kernels of four different seedling populations from Morocco. The concentration of alpha-tocopherol ranged from 300.9 to 656.7 mg/kg oil, showing higher concentrations than what has previously been reported for almond. The concentration of delta-tocopherol ranged from 0.22 to 2.2 mg/kg oil, similar to that of other almond genotypes, and that of gamma-tocopherol from 4.4 to 33.4 mg/kg oil, a wider range than has previously been determined in almond. Although the effect of harvest year was significant, tocopherol variability was due mainly to the genotype. The geographical origin was also significant, with the mountain populations showing higher concentrations of tocopherol, probably due to empirical selection for increased storage life, as tocopherol retards rancidification. These results may help to determine geographical areas of almond production with defined characteristics in order to increase the value of the almond products and the revenue of the local growers. Additionally, some seedlings could be incorporated as parents in a breeding program for increasing tocopherol concentration. (C) 2014 Elsevier Inc. All rights reserved.