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以表面硅烷修饰的碳纳米管为基材,甲基丙烯酸为功能单体,二甲基丙烯酸乙二醇酯为交联剂,采用表面印迹技术成功制备了大黄素印迹复合材料。采用扫描电镜和透射电镜研究该印迹复合材料的形貌,结果表明,在碳纳米管表面接枝了1层稳定的约40nm厚的印迹层。在pH=8.5时,该印迹材料对大黄素具有较大吸附容量和良好选择吸附性能,最大理论吸附量(Qmax)为20.8mg/g。以该印迹材料作为固相萃取吸附剂,在85%乙醇水溶液淋洗和10%乙酸的乙醇溶液洗脱下,可实现对猕猴桃根样品粗提取液中大黄素固相萃取分离富集,回收率达到85%以上。
Using surface silane-modified carbon nanotubes as the substrate, methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the crosslinking agent, the emodin imprinted composite material was successfully prepared by using the surface imprinting technique. The morphology of the imprinted composite was investigated by scanning electron microscopy and transmission electron microscopy. The results showed that a stable layer of about 40 nm was imprinted on the surface of carbon nanotubes. At pH = 8.5, the imprinted material has a large adsorption capacity and a good selective adsorption capacity for emodin. The maximum theoretical adsorption capacity (Qmax) is 20.8 mg / g. Using the imprinted material as solid-phase extraction adsorbent, the elution of emodin in crude extract of kiwifruit root can be achieved by solid phase extraction with 85% aqueous ethanol solution and 10% acetic acid in ethanol. The recovery rate More than 85%.