Multi-Criteria Optimization including Environmental Impacts of a Microwave-Assisted Extraction of Polyphenols and Comparison with an Ultrasound-Assisted Extraction Process

Valorization of wastes and by-products using environmentally friendly technologies with an optimal cost–benefit relationship is a current major issue in agri-food industries. An original tool was recently developed for multi-criteria optimization of an ultrasound-assisted extraction (UAE) process including the assessment of environmental impacts using Life Cycle Assessment. In the present work, this methodology was adapted and applied to another green extraction process, microwave-assisted extraction (MAE), with the same case study, valorization of antioxidant polyphenols from downgraded beet seeds. Once built, the obtained multi-criteria optimization tool was used to investigate performances of the MAE process regarding productivity criteria (polyphenol concentration and antioxidant activity of the extracts), energy consumption and environmental impacts as functions of operating parameters (time, solvent composition, microwave power density, and liquid–solid ratio). The MAE process was optimized under different constraints and compared to the UAE process. For the studied conditions and different investigated scenarios, MAE enabled obtaining extracts with higher polyphenol concentrations and antioxidant activity (approximately 33% and 23% enhancements, respectively), and to strongly reduce extraction duration (by a factor up to 6), whereas UAE enabled reducing the energy consumption (up to 3.6 fold) and the environmental impacts (up to 12% for climate change)

Eco-procédés pour la récupération sélective d'antioxydants à partir d'Aronia melanocarpa et ses co-produits

Les fruits d Aronia melanocarpa sont une des sources végétales les plus riches en substances phénoliques antioxydantes et notamment en anthocyanines. L influence des principaux paramètres opératoires sur la cinétique et les rendements d extraction assistée par ultrasons des anthocyanines et des polyphénols totaux à partir d aronia et ses co-produits a été étudiée. La cinétique d extraction a été décrite par des équations basées sur le modèle de Peleg. Le développement d un modèle global (intégrant le temps, la température, la composition du solvant et la puissance d ultrasons) a été proposé comme un outil pour l optimisation des conditions d extraction des antioxydants. Après une étude préliminaire d enrichissement des extraits en utilisant différents supports solides, la résine macroporeuse Amberlite XAD7HP a été choisie comme la plus appropriée pour l adsorption des molécules antioxydantes d aronia. Finalement, un nouveau procédé écologique intégré extraction-adsorption a été proposé pour la récupération sélective des molécules antioxydantes. Ce procédé a permis d extraire les antioxydants et de purifier simultanément les extraits, permettant d enrichir plus de 15 fois la teneur des anthocyanines dans les extraits. La faisabilité de cet eco-procédé à l échelle semi-pilote a également été démontrée.The Black Chokeberry fruits are one of the richest sources in phenolic antioxidant compounds, particularly in anthocyanins. The influence of the main operating parameters on the kinetics and yields of anthocyanins and total polyphenols extraction with ultrasound assistance was studied. The extraction kinetics was described by equations based on the Peleg s model. The development of a global model (including time, temperature, solvent composition and ultrasound power) was proposed as a tool for optimizing the conditions of antioxidants extraction. After preliminary studies of on extract enrichment using different solid supports, Amberlite XAD7HP macroporous resins was chosen as the most suitable for the adsorption of antioxidants molecules from aronia. Finally, a new ecological integrated extraction-adsorption process was proposed for the selective recovery of antioxidant molecules. This process enabled to extract antioxidant substances and to simultaneously purify the extracts, which led to enrichments by more than 15 times of anthocyanins content in the extracts. Process feasibility on a semi-pilot scale of this new integrated process was demonstrated.LILLE1-Bib. Electronique (590099901) / SudocSudocFranceF

Kinetics of ultrasound-assisted extraction of antioxidant polyphenols from food by-products: Extraction and energy consumption optimization

International audienceUltrasound-assisted extraction (UAE) of antioxidant polyphenols from chicory grounds was studied in order to propose a suitable valorization of this food industry by-product. The main parameters influencing the extraction process were identified. A new mathematical model for multi-criteria optimization of UAE was proposed. This kinetic model permitted the following and the prediction of the yield of extracted polyphenols, the antioxidant activity of the obtained extracts and the energy consumption during the extraction process in wide ranges of temperature (20-60 degrees C), ethanol content in the solvent (0-60% (vol.) in ethanol-water mixtures) and ultrasound power (0-100 W). After experimental validation of the model, several simulations at different technological restrictions were performed to illustrate the potentiality of the model to find the optimal conditions for obtaining a given yield within minimal process duration or with minimal energy consumption. The advantage of ultrasound assistance was clearly demonstrated both for the reduction of extraction duration and for the reduction of energy consumption

Impact of energy supply and oxygen transfer on selective lipopeptide production by Bacillus subtilis BBG21.

The influence of power dissipation and volumetric oxygen transfer coefficient k(L)a on Bacillus subtilis productivity of lipopeptides surfactin and fengycin was studied in shake flasks in view of scaling-up of this fermentation process. The experiments performed with different flask sizes, relative filling volumes, and shaking frequencies confirmed clearly that lipopeptide production changed in function of power dissipation, via interfacial gas-liquid contact surface and oxygen supply. It was demonstrated that k(L)a is the key parameter controlling the productivity and the selectivity of the bioreaction. Varying the oxygen transfer conditions, the synthesis could be oriented to mixed production or to surfactin mono-production. The fraction of surfactin towards total lipopeptides produced and the maximal surfactin production both increased with k(L)a increase (surfactin concentration about 2 g L(-1) at k(L)a=0.04-0.08 s(-1)), while the maximal fengycin production (fengycin concentration about 0.3 g L(-1)) was obtained at moderate oxygen supply (k(L)a=0.01 s(-1))

Modeling and optimization of extraction and energy consumption during ultrasound-assisted extraction of antioxidant polyphenols from pomegranate peels

International audienceUltrasound-assisted extraction (UAE) of antioxidant polyphenols from pomegranate peels (juice production by-products) was studied in an agitated extractor with ultrasound generator and temperature regulation. A mathematical model for multi-criteria optimization of UAE was proposed. This kinetic model permits the following and the prediction of polyphenols extraction yield, antioxidant activity of obtained extracts and energy consumption during extraction process in wide ranges of temperature (20-60 degrees C), ethanol content in the solvent (0-100% EtOH) and ultrasound power density (0-100 W/L). This model allows to visualize and understand the impacts of operating parameters on all three optimization criteria, as well as to find the operating conditions to attain a target extraction yield or antioxidant activity of the extract at minimum time or at minimum energy consumption. The advantage of ultrasound assistance was clearly demonstrated for the reduction of both extraction duration and energy consumption. The obtained high polyphenols yields and high antioxidant activity of the extracts confirmed the suitability of UAE for preparation of antioxidant-rich plant extracts at reduced time and energy from food industry by-products. (c) 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 201

Comparative LCA of ultrasound-assisted extraction of polyphenols from chicory grounds under different operational conditions

International audienceDifferent innovative technologies have emerged in the last decades in the field of extraction processes and are commonly considered as green extraction processes. This work aimed at investigating on the environmental performances of one of these technologies, namely ultrasound assisted extraction, using the recognized life cycle assessment (LCA) methodology. The proposed case study was an ultrasound assisted extraction process for the valorization of antioxidant polyphenols from chicory grounds (food industrial by-product), which could find applications as natural antioxidants in food and cosmetic industries. A comparative LCA was carried out with a functional unit defined as obtaining 0.55 L of extract exhibiting 220 mu mol Trolox equivalent antioxidant capacity. This enabled to evaluate variation of environmental impacts as a function of operating conditions. Increasing temperature implied important raise on all impact categories. Use of ethanol in the solvent implied huge increase of impacts, which moderated gains on extraction yield, and pointed out the importance of including environmental impacts criteria as well as productivity and economic criteria while optimizing processes, in the view of tending to more sustainable solutions. Ultrasounds assistance enabled a general reduction of environmental impacts. Hence, this study confirmed (using the recognized LCA tool) environmental benefits of ultrasound assisted extraction

Valorization of Agrifood By-Products by Extracting Valuable Bioactive Compounds Using Green Processes

In Chapter 4, Valorization of Agrifood By-Products by Extracting Valuable BioactiveCompounds Using Green Processes, prepared by Carciochi et al., is presented the current challenge for the food industry, related to the exploitation of various by-products as sources of new commodities using eco-friendly technologies with an optimal cost-benefit relationship.The main green technologies used to recover natural products from agrifood by-products, such as enzyme-assisted extraction, ultrasound-assisted extraction, microwave-assisted extraction, electrically assisted extraction, pressurized liquid extraction, supercritical fluid extraction, and instant controlled pressure drop, are presented here.Fil: Carciochi, Ramiro Ariel. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ingeniería Olavarría; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaFil: D’Alessandro, Leandro G.. Artois University; FranciaFil: Vauchel, Peggy. Charles Viollette Institute; FranciaFil: Rodriguez, Maria Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ingeniería Olavarría; ArgentinaFil: Nolasco, Susana Maria. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ingeniería Olavarría; ArgentinaFil: Dimitrov, Krasimir. Lille University; Franci

Improvement of yield and selectivity in lipopeptides production process by oxygen transfer rate control

International audienc