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11 results on '"Kandri, Noureddine Idrissi"'

6. Effect of Calcination Temperature on the Stability of the Perovskite Materials - Study of Structural and Morphological Properties.

Author

Maou, Amina, Gouitaa, Najwa, Lamcharfi, Taj Dine, and Kandri, Noureddine Idrissi

Subjects
PEROVSKITE, THERMOGRAVIMETRY, X-ray diffraction, INFRARED spectroscopy, SCANNING electron microscopy
Abstract

In this research, the solid-state method was utilized to synthesize LaFeO3 powders, with La2O3 and Fe2O3 being employed as precursor materials. The prepared samples were calcined at different temperatures 800°C, 900°C, 1000°C, 1100°C, 1200°C and 1300°C for 4h to study phase stability. The thermal effect on structural and morphological properties was reported. The X-ray diffraction results confirmed the pure phase in its orthorhombic configuration at 1200°C and 1300°C, which was confirmed by Rietveld's analysis. Scanning electron microscopy coupled with Energy-dispersive X-ray spectroscopy was employed to analyze the surface morphology and compositional characteristics. In addition, the samples were analyzed by Fourier Transform Infrared Spectroscopy. The thermal behavior of the product was investigated through the utilization of thermogravimetric analysis. [ABSTRACT FROM AUTHOR]

Published
2023
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10. Successive Solvent Extraction, Characterization and Antioxidant Activities of Cardoon Waste (Leaves and Stems) Extracts: Comparative Study

Author

Nabih, Meryem Hajji, Boulika, Hamza, Hajam, Maryam El, Alghonaim, Mohammed I., Kandri, Noureddine Idrissi, Alsalamah, Sulaiman A., and Boufahja, Fehmi

Subjects
antioxidant, cardoon, Organic Chemistry, Pharmaceutical Science, Soxhlet, ultrasonic-assisted extraction, Asteraceae, Analytical Chemistry, Chemistry (miscellaneous), wastes, Drug Discovery, extraction, Molecular Medicine, Physical and Theoretical Chemistry, environment
Abstract

The main interest in the valorization of vegetable wastes is due to the peculiarity of their chemical composition in substances that present important properties. Among these substances, antioxidants could replace those industrially manufactured. In the present study, three solvents of different polarities (hexane, ethanol, and water) were applied for the extraction of phenolic compounds from Cynara cardunculus L. waste using two extraction methods: Soxhlet Extraction (SE) and Ultrasonic-Assisted Extraction (UAE). The obtained extracts were then characterized by Fourier-Transform Infrared (FTIR) spectroscopy and spectrophotometric determination of Total Phenolics (TPC), Total Flavonoids (TFC), and Condensed Tannins (CT). Total Antioxidant Capacity (TAC) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity of ethanol and water extracts of leaves and stems were also evaluated. High extraction yields were obtained by UAE. Water extracts had high yield regardless of the technique used for leaves and stems, and these extracts showed high TAC of 534.72 ± 3.83 mg AAE/g FM for leaves and 215.70 ± 8.87 mg AAE/g FM (mg of ascorbic acid equivalent per g of FM) for stems, and IC50 of 2077.491 μg/mL for leaves and 1248.185 μg/mL for stems. We explain the latter by the high total phenolic contents (TPCs), which reach 579.375 ± 3.662 mg GAE/g FM (mg of gallic acid equivalents per g of fresh matter) for leaves and 264.906 ± 3.500 mg GAE/g FM for stems. These results confirmed that the leaves and stems of the studied cardoon waste were, indeed, interesting sources of natural antioxidants.

Published
2023

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