EXTRACTION, FRACTIONATION AND CHARACTERIZATION OF THE FIBERS OF SOME DATE CULTIVARS OF ALGERIA

A. Benchabane, A. Boutali, F. Kechida
The date is a high energy food, rich in minerals, vitamins and fibers. The objective of the work is to extract, fractionate and characterize the fibers of five cultivars of dates grown in Algeria (‘Degla-Beida’, ‘Tantboucht’, ‘Ghar’ and ‘Mech-Degla’ and ‘Haloua’), harvested in the final stage of maturation (Tamar). The water content was determined by drying. The extraction of cell wall polysaccharides and lignin is made from the material insoluble in alcohol (MIA) by a sequence of chemical agents. They are extracted by water, dilute hydrochloric acid for pectin, sodium chloride (1 M) which was adjusted with acetic acid to lignin and sodium hydroxide at 17.5% for cellulose and hemicelluloses. The water content of the five cultivars studied has to rank in the category of dried dates. The cultivar ‘Degla-beїda’ recorded the highest yield in MIA (28.96% DM) followed by ‘Mech-degla’ (26.17% DM). Total fiber content varies between 7.33 and 16.8%. Fractionation showed that hemicelluloses are the most of these fibers regardless of the cultivar of date. Pectins have the galacturonic acid content (Gal A) the greater in that Gal A is their main component. For neutral monosaccharides, ‘Ghars’ reads as the highest (27.5% DM) and this high content can be explained by interference between the neutral monosaccharides and galacturonic acid monomers in the colorimetric assay. Furthermore, the content of total soluble phenolics (CSTP) was the highest recorded for ‘Haloua’ (0.25% DM).
Benchabane, A., Boutali, A. and Kechida, F. 2013. EXTRACTION, FRACTIONATION AND CHARACTERIZATION OF THE FIBERS OF SOME DATE CULTIVARS OF ALGERIA. Acta Hort. (ISHS) 994:223-229
http://www.actahort.org/books/994/994_21.htm
Phoenix dactylifera, cell-wall polysaccharides, chemical evaluation, galacturonic acid, neutral monosaccharides
French

Acta Horticulturae