The scientists used microwave technology to extract beneficial flavonoids from China-hemp leaves. By testing different conditions like ethanol concentration, extraction time, and temperature, they found the best combination for maximum flavonoid extraction. The optimal conditions were 70% ethanol, 32 mL of liquid per gram of leaves, 25 minutes of extraction time, and 70°C temperature. The actual yield closely matched the predicted value. The extracted flavonoids showed strong antioxidant properties, which means they can help fight harmful molecules in the body.