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9 results on '"Touafek, O."'

1. Extraction of the Volatile Oils of Dictyopteris membranacea Batters 1902 by Focused Microwave-assisted Hydrodistillation and Supercritical Carbon Dioxide: Empirical Kinetic Modelling Approach, Apparent Solubility and Rate Constants

Author

Riad, N., Bouzidi, N., Zahi, M. R., Touafek, O., Daghbouche, Y., Piovetti, L., El Hattab, M., Riad, N., Bouzidi, N., Zahi, M. R., Touafek, O., Daghbouche, Y., Piovetti, L., and El Hattab, M.

Abstract

Supercritical carbon dioxide extraction (SCCO2) and focused microwave-assisted hydrodistillation (FMAHD) were used comparatively to isolate the volatile oils of the brown alga Dictyopteris membranacea from the crude ether extract. The volatiles fractions were analysed by GC/MS, the major compounds were: dictyopterene A, 6-butyl-1,4-cycloheptadiene, 1-undecen-3-one, 1,4-undecadien-3-one, (3-oxoundec-4-enyl) sulphur, tetradecanoic acid, hexadecanoic acid, 3-hexyl-4,5-dithiacycloheptanone, and albicanol. A kinetics study of the extraction of the volatile fractions obtained by the two processes was carried out, an external calibration allowed to quantify the content of the main metabolites. Empirical models were applied to adjust the experimental kinetics values but also to determine the values of apparent solubilities for SCCO2 and the rate constants for FMAHD. The results obtained revealed that the SCCO2 process was characterized by the coexistence of three distinct phases. For FMAHD, the extraction mechanism included two steps. This work is licensed under a Creative Commons Attribution 4.0 International License.

Published
2021

6. Volatile Oil Constituents of Teucrium atratum Pomel from Algeria.

Author

Kabouche, A., Touafek, O., Nacer, A., Kabouche, Z., and Bruneau, C.

Subjects
*LAMIACEAE, *ESSENTIAL oils, *THYMOL, *LAMIALES, *TERPENES, *PHENOLS
Abstract

Teurium atratum (Lamiaceae) is an endemic species growing in northeastern Algeria, where it is used in a mint tea drink. The volatile compounds obtained by hydrodistillation of aerial parts of T. atratum were analyzed by GC and GC/MS. Thirty compounds were characterized, representing 96.9% of the essential oil, with T-cadinol (45.8%), thymol (22.7%) and carvacrol (14.0%) as the main components. [ABSTRACT FROM AUTHOR]

Published
2006
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7. Volatile Oil Constituents of Teucrium atratumPomel from Algeria

Author

Kabouche, A., Touafek, O., Nacer, A., Kabouche, Z., and Bruneau, C.

Abstract

AbstractTeurium atratum(Lamiaceae) is an endemic species growing in northeastern Algeria, where it is used in a mint tea drink. The volatile compounds obtained by hydrodistillation of aerial parts of T. atratumwere analyzed by GC and GC/MS. Thirty compounds were characterized, representing 96.9% of the essential oil, with T-cadinol (45.8%), thymol (22.7%) and carvacrol (14.0%) as the main components.

Published
2006
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8. Analysis of the essential oil of algerian Hypericum perfoliatum (L).

Author

Touafek, O., Nacer, A., Kabouche, A., and Kabouche, Z.

Abstract

The hydrodistilled essential oil of Hypericum perfoliatum (Clusiaceae), grown at Jijel (north-eastern Algeria), was analysed by GC-MS; 35 components, representing 96% of the oil, have been identified, with thymol (22.10%), T-cadinol (18.5%) and 4,5-dimethyl-2-ethylphenol (13%) as the main constituents. Copyright © 2005 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2005
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9. A new long-chain unsaturated ester and other constituents of Hypericum tomentosum.

Author

Touafek O, Kabouche Z, Boustie J, and Bruneau C

Subjects
Esters chemistry, Esters isolation & purification, Hypericum chemistry
Abstract

Three long-chain unsaturated esters (1-3), a fatty acid (4), a fatty ester (5), phytone (6) and a phloroglucinol (hyperfoliatin) (7) were isolated from the light petroleum extract of the endemic species Hypericum tomentosum L. (Clusiaceae). Compound 2, 8,10,13-trimethyltetradecanoic acid (2E)-3-methylhexadec-2-enyl ester, which we named tomentosate, is reported for the first time. The structures of the identified compounds were established on the basis of physical and spectroscopic analysis, and by comparison with literature data.

Published
2012

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