Eco-processes for the selective recovery of antioxidants from Aronia melanocarpa and their by-products

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

Effect of roasting conditions on the antioxidant compounds of quinoa seeds

International audienceThe effect of different roasting conditions on the antioxidant properties and the phenolic content of quinoa seeds was studied. Advanced and final products of the Maillard reaction were also quantified in order to evaluate the contribution to DPPH radical scavenging capacity and reducing power of samples. In general, response surface analysis showed significant increases in the phenolic content, the antioxidant activity and the level of Maillard reaction products (MRPs), mainly as processing temperature increased, while roasting time had a minor impact on these response variables. The highest antioxidant activity was achieved in extracts of quinoa seeds roasted at 190 degrees C for 30min. Principal component analysis applied to the data suggested that MRPs had a greater contribution to antioxidant properties than phenolic compounds in the processed samples. These results demonstrated that roasted quinoa seeds/flour may be considered as a nontraditional ingredient with enhanced antioxidant capacity for the production of functional foods

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

Effect of germination and fermentation process on the antioxidant compounds of quinoa seeds

Quinoa (Chenopodium quinoa) seed has gained a great interest in the last years, mainly due to its nutritional properties and its content of antioxidant substances with health-promoting properties in humans. In this work, the effect of germination time and fermentation on the levels of antioxidant compounds (ascorbic acid, tocopherol isomers and phenolic compounds) and antioxidant activity of quinoa seeds was evaluated. Fermentation was carried out naturally by the microorganisms present in the seeds or by inoculation with two Saccharomyces cerevisiae strains (used for baking and brewing). Ascorbic acid and total tocopherols were significantly increased (p aecurrency sign 0.05) after 72 h of germination process in comparison with raw quinoa seeds, whilst fermentation caused a decrease in both types of compounds. Phenolic compounds and antioxidant capacity were improved using both bioprocesses, being this effect more noticeable for germination process (101 % of increase after three days of germination). Germination and fermentation proved to be desirable procedures for producing enriched ingredients with health-promoting antioxidant compounds in a natural way

Separation and purification of polyphenols from potato peel extracts by membrane filtration

Purification and concentration of a polyphenol extract from potato peels was attempted by membrane filtration as part of the INTERREG IV A meCagrO2 project. Preliminary ultrafiltrations show that about 45 % of the total organic carbon is retained while polyphenols are retained by only 15 %. A full micro-, ultra- and nanofiltration sequence results in a polyphenol concentration factor 2.6. Based on polyphenol content to dry weight ratio a purification by factor 1.7 is reached. In the ultrafiltration, the toxic alpha-solanine is largely separated from the useful polyphenols. The anti-oxidant capacity was measured using square wave voltammetry.status: publishe