A novel polyphenol-coated CoFe₂O₄ system with sorption capacity of lawsone was synthesized as a magnetic sorbent by chemical oxidative polymerization process for magnetic solid-phase extraction of lawsone. The synthesized nanosorbent showed a spherical morphology with diameters under 50 nm by scanning electron microscopy images. The extraction efficiency of this sorbent was studied toward the extraction of lawsone from saline aqueous solution in dispersion mode. Major parameters including the type and volume of desorption solvent, amount of sorbent, desorption time, extraction time, extraction temperature, ionic strength, and pH were optimized. Under the optimum conditions, the relative standard deviation in 0.005 µg mL⁻¹ (inter-day n = 6; intra-day: n = 6; and sorbent to sorbent n = 4) were obtained as 5.2, 8.07, and 11.7%, respectively. A linear calibration curve in the range of 0.003–0.5 µg mL⁻¹ with R² = 0.993 was obtained. The limit of detection and limit of quantification of the method were 0.001 µg mL⁻¹ and 0.003 µg mL⁻¹, respectively. The relative recovery percentages were in range of 90–96.4% for henna leaves, henna shampoo, and henna dermal lotion real samples.

通过化学氧化聚合工艺，以磁性固相萃取紫罗兰酮，合成了一种新型的具有紫罗兰酮吸附能力的多酚包覆的CoFe ₂ O ₄体系作为磁性吸附剂。合成的纳米吸附剂通过扫描电子显微镜图像显示出直径小于50nm的球形形态。研究了该吸附剂对分散模式下从盐水溶液中提取紫罗兰酮的提取效率。优化了主要参数，包括解吸溶剂的类型和体积，吸附剂的量，解吸时间，萃取时间，萃取温度，离子强度和pH。在最佳条件下，相对标准偏差为0.005 µg mL ^-1（日间n = 6; 日内：n  = 6；吸附剂与吸附剂之比（n  = 4）分别为5.2、8.07和11.7％。在0.003-0.5微克mL范围内的线性校准曲线^-1与[R ² 获得= 0.993。该方法的检出限和定量限分别为0.001 µg mL ^-1和0.003 µg mL ^-1。指甲花叶，指甲花洗发水和指甲花真皮乳液真实样品的相对回收率在90–96.4％的范围内。