Gregory Chatel

Dans le contexte actuel du développement durable, l'industrie chimique, souvent montrée du doigt par les institutions et le grand public pour son impact négatif sur l'Homme et l'environnement, doit développer des voies de synthèse compétitives et plus éco-compatibles. La préparation d'époxydes à partir d'oléfines représente aujourd'hui un enjeu essentiel du point de vue de la production d'intermédiaires clés pour l'industrie chimique. Basé sur les nombreuses études publiées dans la littérature, ce travail de thèse a eu pour objectif d'étudier le potentiel des liquides ioniques, solvants novateurs aux propriétés uniques, et des ultrasons de puissance, méthode non conventionnelle d'activation, pour l'époxydation d'oléfines catalysée par des porphyrines métallées. Les protocoles expérimentaux de synthèse des liquides ioniques sélectionnés ont été améliorés au regard des principes de la chimie verte et évalués par des indicateurs spécifiques. Ensuite, les mécanismes des réactions d'époxydation ont été mis en évidence grâce à l'utilisation de porphyrines chirales et à l'étude des paramètres sonochimiques en milieu liquide ionique. Finalement, la stabilité des liquides ioniques sous irradiation ultrasonore a été étudiée ; ainsi, leurs produits de dégradation et leurs mécanismes de formation ont été identifiés.

The wine industry represents a significant economic sector; however, it generates large volumes of waste that can be valorized due to the presence of bioactive compounds, particularly stilbenes. These naturally occurring stilbenes exhibit remarkable potential in the prevention and treatment of various diseases, including cardioprotection, neuroprotection, antidiabetic properties, anti-inflammatory activity, and cancer prevention and therapy. This review discusses biosynthesis, structures, extraction methods, and mechanisms of action of stilbenes, with a particular emphasis on cancer prevention and treatment. Evidence from in vitro, in vivo, and clinical studies demonstrate that stilbenes modulate multiple molecular pathways by promoting apoptosis, inhibiting cell proliferation, and regulating inflammation, oxidative stress, and metabolism. However, the clinical application of stilbenes is limited by their low bioavailability. To overcome this, pharmaceutical formulations have been developed to enhance their stability and bioavailability, reduce side effects, and improve target interactions. These advances are expected to increase the therapeutic efficacy of stilbenes. Furthermore, information on the health benefits of less common stilbenes remains limited, highlighting the need for further research on these compounds.

This Feature Article reviews recent advances in green chemistry and outlines strategic pathways to scale sustainable technologies—such as non-conventional activations and green solvents—from research innovation to industrial applications.

The aim of this study was to evaluate the antioxidant and antibacterial properties of apple pomace (AP) extracts using natural deep eutectic solvents (NADES). Six NADES, based on choline chloride (ChCl), were used as environmentally friendly solvents. Four of these were combined with organic acids, while the other two were combined with urea; they were then used to extract bioactive compounds from AP. ChCl:urea mixture proved to be the solvent with the highest total polyphenol content (TPC), with 13.15 ± 4.70 mg gallic acid equivalent/mL. Antioxidant activity and total anthocyanidin content (TAC) were also assessed. ChCl:oxalic acid recorded the highest values with 35.59 ± 9.53 mg extract/mL and 64.81 ± 4.65 malvidin‐3‐glucose equivalent μg/mL, respectively. Solvent pH plays a crucial role in selective extraction; an acidic pH facilitates selective anthocyanidin extraction, while a basic pH does not. Anthocyanidin extraction correlated with extract antioxidant activity and solvent viscosity. In addition, the antibacterial activity of the extracts against Bacillus cereus , Listeria innocua , and Escherichia coli strains was studied. All extracts showed antibacterial properties against the strains tested. The ChCl:oxalic acid extracts showed particularly low minimum inhibitory concentrations (e.g., 25 mg _extract /mL for B. cereus ) and EC ₅₀ values (e.g., 6.0 ± 0.3 mg _extract /mL for B. cereus ).