Optimization of Extraction and Antioxidant Activities of Resveratrol from <i>Polygonum cuspidatum</i> by Ultrasound-Assisted Natural Deep Eutectic Solvent Method.

Furthermore, all quadratic terms (A 2 , B 2 , C 2 , and D 2 ) were highly significant ( p < 0.0001), suggesting pronounced nonlinear relationships in the extraction process, which is essential for interpreting the experimental outcomes [ 59 ].

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