Ultrasound-enzyme-assisted extraction of flavonols from Polygonatum odoratum using ternary natural deep eutectic solvents

under the optimal conditions of cellulase dosage 1.1%, ultrasonic time 62 min, ultrasonic temperature 61 °C, and water content 60%. The study provides an efficient and environmentally friendly way to extract flavonols from natural medicinal plants, and also elucidates the potential mechanism of the ultrasound-enzyme-assisted ternary NADESs for the improved extraction efficiency.