Sugar and free amino acid composition of five cultivars of dates from offshoots or vitroplants in open fields

Abstract

Morphological and chemical analyses of mature dates related to the propagation method (traditional vegetative propagation and two different methods of in vitro multiplication) of the date palm are presented. No significant differences were seen among Bou Sthammi noire, Mejhool, Theory, and Zahidi cultivare propagated by traditional methods and by the French Group on Date Palm Research in vitro multiplication technique, based on axillary budding. These results could indicate that the vitroplants conform to mother trees. Of the five cultivare studied, only the Deglet Nour dates, obtained from callus (somatic embryogenesis), showed divergences in sugar and amino acid composition. In this case, Deglet Nour vitroplants contain no sucrose, more glutamic acid, glutamine, -amino-butyric acid, and arginine, and less alanine. We could suppose that variations were introduced by the micropropagation technique.

Physico-chemical Characterization, Classification and Quality Evaluation of Date Palm Fruits of some Moroccan Cultivars

“…The differences observed between the cultivars and the samples of the same cultivar can be explained by the type of soil where date palms are grown and the irrigation status. The ash content is low compared to the weight of dry matter of fruit, reflecting a fairly active synthesis of organic compounds by the vegetative parts [5].…”

“…The sugar fraction of Deglet Nour and Kentichi cultivars of Tunisia was essentially formed by non-reducing sugars (~53.59-58.40 g/100g dry matter) [28]. "Thoory" date cultivar with dry consistence contains 40% of sucrose [5].…”

“…Understanding of the physicochemical and biochemical characteristics of dates cultivars is considered as the key factor for a better utilization of dates in the country overall. Physicochemical analyses of dates were carried in many countries such as in Iraq, Iran, Saudi Arabia, Egypt, Sudan, Algeria, Tunisia amongst other countries [3][4][5][6][7][8][9][10][11] . The pulp of dates is an important source of sugars (70-90%) mainly glucose, fructose and sucrose) and dietetic fibers (4-10%) and low contents of proteins, lipids and ash [12].…”

Chemical and aroma volatile compositions of date palm (Phoenix dactylifera L.) fruits at three maturation stages

“…Sugar levels were measured according to the high-performance liquid chromatography (HPLC) method of Booij et al (1992). Sugars were extracted from date fruits (3 g) with 25 ml of ultrapure water for 10 min (stirring frequently to aid dissolving the sugars).…”

Élaboration d’une boisson à partir d’écart de triage de dattes : clarification par traitement enzymatique et microfiltration

“…Les dattes présentent, en effet, des teneurs importantes en sucres [1], en élé-ments minéraux et en vitamines [2]. Elles contiennent également des protéines [1] et des lipides.…”