In the present investigation, we worked on isolation and elucidation of endophytic fungi secondary metabolites. We were interested by isolation of two endophytic fungi, Embellisia eureka and Neonectria macrodidyma as new producers of Brefeldin A and 3,4- dihydro-3,4,8-trihydroxy-1[2 H ]-naphthalenone. The fungi were isolated from two Moroccan plant species, respectively are Mentha pulegium and Cladanthus Arabicus . From embellisia we isolated the 3,4,8- trihydroxy-1[2 H ]-naphthalenone and from the second fungi we isolated the Brefeldin A. The characterization and structure elucidation were done by using chromatography technics, high resolution mass spectrometry (HRMS), mass spectrometry LC-MS/MS, NMR and crystal diffraction X-Ray (DRX) analysis.

Brefeldin A

Isolation

10.48369/imist.prsm/jmch-v11i1.2918

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Citations (1)

Extraction and Characterization of Nanocrystalline Cellulose from Doum (Chamaerops humilis) Leaves: A Potential Reinforcing Biomaterial

Journal of Polymers and the Environment (2016)

Meriem Fardioui A. Stambouli Taoufik Gueddira Abdelouahed Dahrouch Abou el kacem Qaiss

Thermogravimetric analysis

Thermal Stability

Nanocrystalline material

Zeta potential

Biomaterial

Characterization

10.1007/s10924-016-0784-5

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Citations (35)

The Effect of Physical Aging on the Mechanical Properties of Raw, Treated and Compatibilized Coir Fibers-Based Polyisoprene Bio-Composites

International Polymer Processing (2020)

C. A. Kakou Marya Raji Hind Abdellaoui Rachid Bouhfid Abou el kacem Qaiss

Abstract The production of bio-composites based on vulcanized rubber reinforced by natural fibers has been widely studied. However, the aging phenomenon occurring during the long-term storage generating irreversible damage is limiting the performance of this kind of composites which has not been studied in details. So the objective of this work was to characterize and understand the structure-mechanical property relationships in these bio-composites and to correlate the effective crosslinking density with physical aging as a function of fiber content (0, 20, 30 and 40 wt.%) and fiber surface modification (alkali treatment) for the system polyisoprene (PI) and coir fibers. Furthermore, interfacial adhesion was improved by using maleic anhydride grafted polyisoprene as a coupling agent. From the samples produced, a complete set of morphological (scanning electron microscopy) and mechanical (shear and tension) characterization was performed before and after natural aging. The results showed that the tensile modulus increased with fiber content for the range of conditions studied and the presence of a coupling agent always gave higher tensile strength due to better interfacial stress transfer. However, important elasticity loss (strain at break) was observed due to the low fiber elasticity. Finally, different physical aging mechanisms led to changes in the molecular configuration and a reduction of free volume caused by a post-curing phenomenon of the polyisoprene matrix and low environmental stability of the fibers. These phenomena were shown to increase the Young’s modulus of the neat matrix by eight times compared to the unaged neat polyisoprene, but a smaller variation (five times) was observed for the bio-composites which was related to different crosslinking density and coir fibers state of dispersion in the vulcanized matrix

Maleic anhydride

Compression set

Natural fiber

10.1515/ipp-2020-350505

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Citations (4)

CCDC 735236: Experimental Crystal Structure Determination

The Cambridge Structural Database (2009)

Rachid Bouhfid E.M. Essassi Abdelfettah Zerzouf H. Reuter

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccsp29t

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Citations (0)

Effect of Filler Content on Flexural and Viscoelastic Properties of Coir Fibers and Argania Nut-shells Reinforced Phenolic Resin Composites

Journal of Bionic Engineering (2022)

Hala Bensalah Marya Raji Kamal Gueraoui Abdelazziz Khtira Hamid Essabir

Compression molding

Filler (materials)

Flexural modulus

10.1007/s42235-022-00239-4

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Citations (3)