| Title | Optimization of Process Variables for the Sustainable Extraction of Phenolic Compounds from Chicory and Fennel By-Products |
|---|---|
| ID_Doc | 6750 |
| Authors | Baiano, A; Romaniello, R; Giametta, F; Fiore, A |
| Title | Optimization of Process Variables for the Sustainable Extraction of Phenolic Compounds from Chicory and Fennel By-Products |
| Year | 2023 |
| Published | Applied Sciences-Basel, 13, 7 |
| Abstract | The production of minimally processed vegetables generates large amounts of by-products whose concentrations in bioactive compounds is comparable to those of the edible part. The aim of this work was the optimization of sustainable processes for the extraction of phenolic compounds from chicory and fennel by-products using water as solvent. The results were compared with those obtained through a conventional extraction performed with a 70% ethanol aqueous solution as extraction solvent. The ultrasound-assisted extraction (UAE) and microwave-assisted extractions (MAE) were established by developing two Box-Behnken designs, respectively, a four-factor, three-level design and a three-factor, three-level design. A quadratic polynomial model was useful in optimizing both the ultrasonic (R-2 0.8473 for chicory and R-2 0.9208 for fennel) and microwave (R-2 0.9145 for chicory and R-2 0.7836 for fennel) extraction of bioactive compounds as well as the antioxidant activity of extract (R-2 0.8638 for chicory and R-2 0.9238 for fennel treated with ultrasounds; R-2 0.9796 for chicory and R-2 0.7486 for fennel submitted to MAE). The UAE conditions able to maximize the total phenolic concentrations were: 10 g/100 mL, 55 degrees C, t: 60 min, 72 W for chicory (9.07 mg gallic acid/g dm) and 15 g/100 mL, 45 degrees C, t: 40 min, 120 W for fennel (6.64 mg gallic acid/g dm). Concerning MAE, the highest phenolic concentrations were obtained applying 7.5 g/100 mL; 2 min; 350 W for chicory (8.23 mg gallic acid/g dm); 7.5 g/100 mL; 3 min; 160 W for fennel (6.73 mg gallic acid/g dm). Compared to conventional solvent extraction, UAE and MAE allowed the obtainment of (a) chicory extracts richer in phenolic compounds (+48% and +34%, respectively), in less time (4-fold and 90-fold reduction, respectively) and (b) fennel, extracts with slightly lower amount of phenolics (-11.7% and -10.5%, respectively) but halving the extraction time (UAE) or reducing it to 60-fold (MAE). |
| https://www.mdpi.com/2076-3417/13/7/4191/pdf?version=1679904782 |
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