This study focuses on the application of the liquid biphasic flotation (LBF) system for the extraction of phenolic compounds using fresh and wilted Persicaria tenella, commonly known as ‘daun kesum’ or ‘laksa leaf’. Persicaria tenella have been studied intensively due to its possession of antioxidant activities which assists in reducing the risk of cancer and various other uses. For fresh samples, the optimum condition was obtained using the combination of 90% (w/w) of ethanol and 300 mg/L of dipotassium hydrogen phosphate (K₂HPO₄), flotation time of 7 min, system pH of 9.5, 2% weight ratio of Persicaria tenella extract and 100 cc/min of flotation rate. With this, a recovery yield of 13.69% and a separation efficiency of 76.79% were achieved. For wilted samples, the optimum condition was gained using 100% (w/w) of ethanol and 250 mg/L of ammonium sulphate ((NH₄)₂SO₄), flotation time of 9 min, system pH of 5, 1% weight ratio of Persicaria tenella extract and 100 cc/min of flotation rate. With this, a recovery yield of 12.36% and a separation efficiency of 85.39% were achieved. The sample was subjected to the determination of Trolox equivalent antioxidant capacity (TEAC) to evaluate its antioxidant capacity after optimization.

这项研究的重点是液体双相浮选（LBF）系统在使用新鲜和枯萎的百日草（Persicaria tenella）（通常称为“ daun kesum”或“叻沙叶” ）提取酚类化合物中的应用。由于Persicaria tenella具有抗氧化活性，有助于降低癌症和各种其他用途的风险，因此已进行了深入研究。对于新鲜样品，使用90％（w / w）乙醇和300 mg / L磷酸氢二钾（K ₂ HPO ₄），浮选时间为7分钟，系统pH值为9.5、2的组合可获得最佳条件。百日草重量百分比％萃取液和100 cc / min的浮选速率。这样，获得了13.69％的回收率和76.79％的分离效率。对于枯萎的样品，使用100％（w / w）乙醇和250 mg / L硫酸铵（（NH ₄）₂ SO ₄），浮选时间为9分钟，系统pH为5、1％可获得最佳条件。百日草提取物的重量比和100 cc / min的浮选速率。这样，获得了12.36％的回收率和85.39％的分离效率。对样品进行Trolox等效抗氧化能力（TEAC）的测定，以评估优化后的抗氧化能力。