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227 results on '"Belghith, Hafedh"'

11. Enzymatic treatments of pine wood flour for high-density polyethylene composites: Impact on thermomechanical, aging, and wear behavior.

Author

Fajraoui, Afef, Bouzidi, Mohamed, Omrani, Nihel, Lacoste, Catherine, Belghith, Hafedh, Gargouri, Ali, and Elloumi, Ahmed

Subjects
HIGH density polyethylene, XYLANS, ENGINEERED wood, WOOD flour, FOURIER transform spectroscopy, TREATMENT effectiveness, GRAVIMETRIC analysis, WEAR resistance, PINE
Abstract

The use of pine wood in wood-plastic composite WPC promotes sustainability by incorporating recycled or renewable materials, reducing the reliance on traditional wood sources, and minimizing environmental impact. This study focuses on treating pine wood flour (WF) with biological treatments (xylanase, pectinase, laccase, steam explosion) for use in WPC. The Scanning Electron Microscopy (SEM), Fourier Transform Infared spectroscopy (FTIR), biochemical analysis, and Thermo Gravimetric Analysis (TGA) were used to evaluate the effectiveness of the treatments in terms of the morphological, compositional, surface, and thermal stability of WF. The wear behavior of WPC was exanimate before and after hydrothermal aging. Morphological analysis of WF revealed that the enzymatic treatment produced a clean surface; it removed Xylan and led to a higher cellulose content (70%), and more porosity, and improved thermal stability and adhesion between WF and high density polyethylene (HDPE). Through analysis of wear and aging, we found the best wear resistance for laccase treatment among all WPC before and after aging, and it was lower than the HDPE. These findings highlight the positive impact of the enzymatic treatment on the adhesion between WF and HDPE, leading to reduced water absorption and increased wear resistance. [ABSTRACT FROM AUTHOR]

Published
2023
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23. Artificial Neural Networks and Response Surface Methodology Approach for Optimization of an Eco-Friendly and Detergent-Stable Lipase Production from Actinomadura Keratinilytica Strain Cpt29

Author

Semache, Noura, primary, Benamia, Fatiha, additional, Kerouaz, Bilal, additional, Belhaj, Inès, additional, Bounour, Selma, additional, Belghith, Hafedh, additional, Gargouri, Ali, additional, Ladjama, Ali, additional, and Djeghaba, Zeineddine, additional

Published
2021
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36. Concomitant production of multifunctional metabolites on biodiesel-derived crude glycerol by the oleaginous yeast Rhodotorula babjevaeY-SL7

Author

Guerfali, Mohamed, Ayadi, Ines, Ayadi, Wajdi, Smaoui, Slim, Elhadef, Khaoula, Zaghden, Hatem, Jlaiel, Lobna, Sahli, Emna, Belghith, Hafedh, and Gargouri, Ali

Abstract

Yeasts have received significant attention in recent years as major sources of value-added metabolites endowed with various natural biological activities. Among the yeasts studied until now, the so-called red yeasts have a great potential in microbial lipids and carotenoids production serving as precursor for biofuels, oleo-chemicals, and food additives. In this work, biodiesel-derived crude glycerol was used as feedstock for concomitant valuable metabolites production by the oleaginous yeast Rhodotorula babjevaeY-SL7. Under specific conditions, this strain has been shown to accumulate a high intracellular content of microbial oil (> 40%) and to secrete a mixture of polyol esters of fatty acids (PEFA). Using fed-batch fermentation, the appropriate culture conditions were established for maximum lipids and carotenoids production. The characterization of extracted carotenoids reveals the presence of two major compounds, the torularhodin (63.7%) and torulene (36.3%) and their related antimicrobial and antioxidant activities were investigated. Moreover, secreted PEFAs showed therapeutically promising cytotoxic effect against cancer cells and their synergistic action with commercial drug was also established. On the other hand, flow cytometry analysis showed that culture on crude glycerol increases cells membrane permeability and further enhances metabolites recovery. This can facilitate downstream processing and therefore increase the profitability of the production system. Indeed, the present study opens new perspectives for multifunctional metabolites production using cheap industrial by-product through completely eco-friendly processes

Published
2022
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46. Anti-obesity effect and protection of liver-kidney functions by Codium fragile sulphated polysaccharide on high fat diet induced obese rats

Author

Kolsi, Rihab Ben Abdallah, primary, Jardak, Neila, additional, Hajkacem, Faten, additional, Chaaben, Rim, additional, jribi, Imed, additional, Feki, Abdelfattah El, additional, Rebai, Tarak, additional, Jamoussi, Kamel, additional, Fki, Lotfi, additional, Belghith, Hafedh, additional, and Belghith, Karima, additional

Published
2017
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47. Sulphated polysaccharide isolated from Sargassum vulgare : Characterization and hypolipidemic effects

Author

Kolsi, Rihab Ben Abdallah, primary, Salah, Hichem Ben, additional, Jardak, Neila, additional, Chaaben, Rim, additional, Jribi, Imed, additional, Feki, Abdelfattah El, additional, Rebai, Tarak, additional, Jamoussi, Kamel, additional, Allouche, Noureddine, additional, Blecker, Cristophe, additional, Belghith, Hafedh, additional, and Belghith, Karima, additional

Published
2017
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