Osmotic dehydration of pomegranate seeds : mass transfert kinetics and differential scanning calorimetry characterization.

in International Journal of Food Science & Technology (2009), 44

Date flesh: Chemical composition and characteristics of the dietary fibre

in Food Chemistry (2008), 111(3), 676-682

The date by-products of two date palm (Phoenix dactylifera L.) cultivars, Deglet-Nour and Allig, from the Degach region (Tunisia), were analysed for their main chemical composition. Studies were also ... [more ▼]

The date by-products of two date palm (Phoenix dactylifera L.) cultivars, Deglet-Nour and Allig, from the Degach region (Tunisia), were analysed for their main chemical composition. Studies were also conducted on the physicochemical properties (colour, water and oil-holding capacity and theological behaviour) of dietary fibre (DF) extracted from date flesh. The following values (on a dry matter basis: DM) were obtained for fleshes of Deglet-Nour and Allig cultivars, respectively: sucrose 52.7% and 13.9%, glucose 13.7% and 29.9%, fructose 12.6% and 29.0%, total dietary fibre 14.4% and 18.4%, protein 2.1% and 3%, ash 2.5% and 2.52%. Insoluble DF, the major fraction of total DF, constituted 9.19-11.7% DM for Deglet-Nour and Allig, respectively. The elaboration of DF concentrates from date fleshes was characterised by an extraction yield of 67%. The chemical composition of these DF concentrates showed high total DF contents (between 88% and 92.4% DM) and low protein and ash contents (8.98-9.12% and 2.0-2.1% DM, respectively). The DF concentrates showed a high water-holding capacity (similar to 15.5 g water/g sample) and oil-holding capacity (similar to 9.7 g oil/g sample),and pseudoplasticity behaviour of their suspensions. Thus, date DF concentrates may not only be an excellent source of DF but an ingredient for the food industry. (c) 2008 Elsevier Ltd. All rights reserved. [less ▲]

Optimization of pectin extraction from lemon by-product with acidified date juice using response surface methodology

in Carbohydrate Polymers (2008), 74(2), 185-192

Response surface methodology was used to optimize pectin recovery from lemon by-product using an acidified date juice as extraction solution. When enriched in pectin, this latter can be useful for ... [more ▼]

Response surface methodology was used to optimize pectin recovery from lemon by-product using an acidified date juice as extraction solution. When enriched in pectin, this latter can be useful for preparation of date-lemon jelly. The effects of three parameters namely temperature, pH and extraction time, on pectin extraction were Studied. The fitted mathematical model allowed Lis to plot response surfaces as well as isoresponse curves and to determine optimal extraction conditions. Results clearly indicated that the temperature was the main factor influencing the pectin yield which increased with temperature and time or decreasing pH. The selected optimal conditions were: temperature 84.34 degrees C extraction time 3 h 34 min and pH 2.8. These conditions yielded about 11.21%, of pectin versus 10.89% for the predicted value. (C) 2008 Elsevier Ltd. All rights reserved. [less ▲]

Sterol Composition Of Black Cumin (Nigella Sativa L.) And Aleppo Pine (Pinus Halepensis Mill.) Seed Oils

in Journal of Food Composition and Analysis (2008), 21(2), 162-168

Contribution to the valorization of^pomegranate (Punica granatum L.)

Poster (2007, October 11)

Nigella sativa L.: Chemical composition and physicochemical characteristics of lipid fraction

in Food Chemistry (2007), 101(2), 673-681

Physicochemical properties of two Nigella seed varieties, having a Tunisian and Iranian origin, were determined. Physical and chemical analyses of crude oils extracted from the seeds by a cold solvent ... [more ▼]

Physicochemical properties of two Nigella seed varieties, having a Tunisian and Iranian origin, were determined. Physical and chemical analyses of crude oils extracted from the seeds by a cold solvent method were also performed. The following results (on a dry-weight basis) were obtained for Tunisian and Iranian varieties, respectively: protein 26.7% and 22.6%, oil 28.48% and 40.35%, ash 4.86% and 4.41%, and total carbohydrate 40.0% and 32.7%. The major unsaturated fatty acids were linoleic acid (50.3-49.2%), followed by oleic acid (25.0 23.7%), while the main saturated fatty acid was palmitic acid (17.2-18.4%). Myristic, myristoleic, palmitoleic, margaric, margaroleic, stearic, linolenic, arachidic, eicosenoic, behenic and lignoceric acids were also detected. Thermal profiles of both Nigella seed varieties, determined by their DSC melting curves, revealed different thermograms. Sensorial profiles of Tunisian and Iranian seed oils were defined through the CieLab (L-*, a(*), b(*)) colour, oxidative stability by Rancimat test and viscosity. Physicochemical properties of the oils for Tunisian and Iranian varieties, respectively, include: saponification number 211 and 217, peroxide value 5.65 and 4.35, iodine index 120 and 101, and an acidity of 22.7% and 18.6%. Results suggested that Nigella seed oil could deserve further consideration and investigation as a potential new multi-purpose product for industrial, cosmetic and pharmaceutical uses. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

Physicochemical characterization of a dietary fibre concentrate extracted from date pulp.

Poster (2006, October)

Preparation and characterization of osmodehydrated fruit from lemon and date by-products.

Poster (2006, May)

Activité biologique de la sève phloémique du palmier datier Phoenix dactylifera L.

Poster (2006)

Essai de valorisation d'écarts de triage de dattes : élaboration et caractérisation d'un extrait concentré de la pulpe.

in Microbiol. Hyg. Alim. (2006), 18(51), 3-12