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Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Hamadi N.B.,Laboratory of Synthesis Heterocyclic and Natural Substances | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2012

Mature red fruits of Opuntia ficus-indica contain two soluble pigment, betanin and indicaxanthin. The optimal conditions for dye extraction were to mix 50g of juice from cactus pears with 100mL of acidified water as solvent for dye extraction. Two main dyes were purified from the pigment extract by chromatography and identified by UV-vis, HPLC and LC-MS techniques as indicaxanthin (15mg per 100g) and betanin (280mg per 100g). The effect of dye bath pH, salt concentration, dyeing time and temperature was studied. The optimal conditions for dyeing modified acrylic fabrics with betanin dye were carried out at 50°C for 45min at pH 5. Un-mordanted samples have good properties of water and washing fastness. Mordant CoSO 4 was found to give good light fastness (rating 5). © 2011 Elsevier B.V. Source


Al-Duaij O.K.,Islamic University | Ben Hamadi N.,University of Monastir | Khezemi L.,Laboratory of Synthesis Heterocyclic and Natural Substances
Journal of Heterocyclic Chemistry | Year: 2015

A simple and convenient method for the synthesis of heterocycles substituted with carbohydrate analogs is described. The chiral optically pure five-membered glycoconjugates containing the isoxazoline unit were obtained by an aromatic nitrile oxides cycloaddition with 1-phenyl-1,2-dihydro-pyridazine-3,6-dionyl N-glycoside derivatives. © 2015 HeteroCorporation. Source


Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Ben hamadi N.,Laboratory of Synthesis Heterocyclic and Natural Substances | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2013

The dyeing of modified acrylic fabrics using indicaxanthin as a natural dye isolated from fruits of Opuntia ficus-indica has been studied in both conventional and ultrasonic techniques. Factors affecting the dyeing properties such as pH values, salt concentration, temperature, duration of dyeing bath, and ultrasonic power were studied. The optimal conditions for dyeing with indicaxanthin dye were carried out at 80 °C for 30. min at pH 3. Sonicator dyeing showed marked improvement in dye uptake. The results of fastness properties of the dyed fabrics were fair to good. Dyeing kinetics using conventional and ultrasonic conditions was compared. Color strength values obtained were found to be higher with ultrasonic than with conventional heating. Dyeing kinetics of modified acrylic fiber with indicaxanthin dye using conventional and ultrasonic conditions were compared. The values of dyeing rate constant, half-time of dyeing and standard affinity and ultrasonic efficiency have been calculated and discussed. © 2012 Elsevier B.V. Source


Guesmi A.,University of Monastir | Hamadi N.B.,Laboratory of Synthesis Heterocyclic and Natural Substances | Ladhari N.,University of Monastir | Saidi F.,Laboratory of Micro Optoelectronics and Nanostructures | And 2 more authors.
Industrial Crops and Products | Year: 2013

This study aims to evaluate the fluorescence property of wool fabric dyed with indicaxanthin, natural dye. Fluorescence measurements have been developed on wool samples before and after dyeing. The emission spectrum of the undyed wool fabric does not illustrate any peak and in the contrary, dyed wool sample present interesting photoluminescence property and the highest value was recorded at 576. nm. Aging behavior upon exposure to light irradiation and upon washing was studied and it has been proved that samples keep interesting fluorescence properties. © 2013 Elsevier B.V. Source


Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Hamadi N.B.,Laboratory of Synthesis Heterocyclic and Natural Substances | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2012

This research work involves the dyeing of wool with indicaxanthin, a natural dye extracted from fruits of Opuntia ficus-indica. The optimal conditions for dye extraction were to mix 50g of Juice from cactus pears with 100mL of 80% aqueous ethanol as solvent for dye extraction. Liquid chromatography was applied for the separation. Two main dyes were obtained, which were identified as indicaxanthin (75mg per 50g) and betanin (5mg per 50g). The effect of dye bath pH, salt concentration, dyeing time and temperature were studied. The optimal conditions for wool dyeing with indicaxanthin dye were carried out at 70°C for 90min with the pre-treatment of various metal salts as mordant. The colour yields of the dye on the wool were found to be highly dependent of the pH, optimum results being obtained at pH 4. The K/S of wool increased in the order of the dyeing using KAl (SO 4) 2>MnSO 4>CoSO 4>FeSO 4>none>ZnSO 4>CuSO 4. Un-mordanted samples have good properties of water and washing fastness. Mordants KAl (SO 4) 2 and CoSO 4 were found to give good light fastness (rating 5). © 2011 Elsevier B.V. Source

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