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Valorisation de quelques plantes médecinales [médicinales] issues de la flore tunisienne : extraction par CO2 supercritique

Abstract : The supercritical fluid extraction, using carbon dioxide, has several advantages over conventional methods of extraction such as the gain of time, selectivity and absence of extracted substances degradation. In this context, the extraction of myrtle flowers and Pistacia were studied by determining their optimal conditions for a good performance. This study showed for both plants high efficiency when working at high pressures in the order of 200 bars, at a low temperature of 40 ° C and for small particle sizes of the order of 220μm. The myrtle extract showed a better antioxidant activity than the essential oil of the same plant with an IC50 of about 30 μg / ml. The optimization of antioxidant extracts from Pistacia supercritical using CO2 showed different results from those for performance and we have good antioxidant activity for pressures of about 80 bars. At 84 bars, the study showed that we can have an extract with a better price-quality ratio for industrial supercritical installations of large sizes. The addition of extracts and essential oils to food products was enriching and has given an added value which can represent an innovation in the food industry. Finally, the experimental results for the extraction with supercritical CO2 of Pistacia extract were modeled through Sovova model (1994) for its reliability and the obtained numerical results agree with previous studies in the literature.
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https://hal.univ-lorraine.fr/tel-02461366
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Submitted on : Thursday, January 30, 2020 - 4:08:50 PM
Last modification on : Tuesday, June 16, 2020 - 11:28:03 AM

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  • HAL Id : tel-02461366, version 1

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Abdelkarim Aydi. Valorisation de quelques plantes médecinales [médicinales] issues de la flore tunisienne : extraction par CO2 supercritique. Génie des procédés. Université de Lorraine; Institut National des Sciences Appliquées et de Technologie (Tunisie), 2014. Français. ⟨NNT : 2014LORR0386⟩. ⟨tel-02461366⟩

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