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International Journal of Agronomy
Volume 2016, Article ID 8203720, 8 pages
http://dx.doi.org/10.1155/2016/8203720
Research Article

Characteristic Profiles of an Original Drink Sap from Male and Female Deglet Nour Palm (Phoenix dactylifera L.) during Collection Period

1Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, Laboratoire Analyse, Valorisation et Sécurité des Aliments, route de Soukra, 3038 Sfax, Tunisia
2Gembloux Agro Bio-Tech, Université de Liège, Unité de Technologie des Industries Agro-Alimentaires, Passage des Déportés 2, 5030 Gembloux, Belgium

Received 5 November 2015; Accepted 17 January 2016

Academic Editor: David Clay

Copyright © 2016 Ines Makhlouf-Gafsi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work aimed to evaluate the nutritional quality of a typical natural drink from male and female Deglet Nour (DN) date palm (Phoenix dactylifera L.) during the collection period. Dry matter, protein, amino acids, and sugar profiles were determined using AFNOR norm, Kjeldahl method, HPLC, and HPAEC-PAD, respectively. The male sap dry matter content was higher than that of the female. It decreased significantly through the tapping period. During the harvest, the male sap protein content decreased but increased significantly in the female sap. Finally, sugar fraction, for both male and female DN sap, was dominated by sucrose, glucose, fructose, and a small amount of myo-inositol. During the collection time, sugar content is affected by the sex especially for myo-inositol content that increased significantly in the female date sap, unlike that of the male one. This may be related to the fact that the male palm is more resistant to physiological stress, inducing myo-inositol formation during tapping.