Speaker
Description
Green walnut (Juglans regia L.) husk is a valuable agro-industrial byproduct rich in bioactive compounds. In this study, ultrasound-assisted extraction (UAE) was employed for the recovery of polyphenolic compounds from green walnut husk using environmentally friendly solvents. The design of experiments included three independent variables: solvent composition (water, 20 %, 50 %, and 70 % ethanol), extraction time (0, 2, 6, and 10 min), and ultrasonic power (10 %, 30 %, and 50 %). The effects of these parameters on the total polyphenol content (TPC), were evaluated using a standard UV–Vis spectrophotometric method. The regression model showed strong agreement with the experimental data (R² = 0.9529). The analysis of variance (ANOVA) identified the quadratic effect of extraction time (p < 0.0001) and its cubic effect (p < 0.0001) as the strongest statistically significant terms. Ultrasonic power (p = 0.0182), the interaction between time and power (p = 0.0389), and the quadratic effect of ethanol concentration (p = 0.0109) were also significant, while the remaining terms were statistically insignificant. Optimization identified an extraction time of 10.0 min, ultrasonic power of 50.0 %, and ethanol concentration of 70.0 % as the optimal conditions, yielding a maximum predicted TPC of 1628.53 mg/l. These findings indicate that the fitted model identifies conditions that maximize the predicted recovery of polyphenols from green walnut husks within the investigated experimental region.
Keywords: green walnut husk, ultrasound-assisted extraction (UAE), total polyphenol content (TPC), process optimization.
| Conference Topics | Green Engineering |
|---|