A functionalized multi-walled carbon nanotube-based composite monolith as a solid-phase extraction adsorbent for on-line purification and enrichment of ursolic acid in medicinal plants,Analytical Methods

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A functionalized multi-walled carbon nanotube-based composite monolith as a solid-phase extraction adsorbent for on-line purification and enrichment of ursolic acid in medicinal plants
Analytical Methods ( IF 2.7 ) Pub Date : 2019/12/27 , DOI: 10.1039/c9ay02395j
Huan Yu _{1,

2,

3,

4,

5} , Haiyan Liu _{1,

2,

3,

4,

5} , Chunliu Yang _{3,

4,

5,

6} , Xiaoya Pang _{1,

2,

3,

4,

5} , Miaomiao Zhang _{1,

2,

3,

4,

5} , Hongyuan Yan _{1,

2,

3,

4,

5} , Ligai Bai _{1,

2,

3,

4,

5} , Dandan Han _{3,

4,

5,

6}

Affiliation

A novel poly(f-MWCNTs-co-ST-co-EDMA) monolith was prepared using functionalized multi-walled carbon nanotubes (MWCNTs) and styrene (ST) as comonomers and ethylene glycol dimethacrylate (EDMA) as the crosslinker. The surface morphology and internal structure of the monolith were determined by scanning electron microscopy (SEM), nitrogen adsorption–desorption isotherm and mercury intrusion porosimetry. The monolith possessed a homogeneous and continuous structure and large surface area. The monolith was used as the sorbent for on-line enrichment and purification of ursolic acid. The linear range was 0.0002–3.5 mg mL⁻¹; the limit of detection (LOD) and the limit of quantitation (LOQ) were 0.52 μg mL⁻¹ and 1.72 μg mL⁻¹, respectively. The intra-day and inter-day precisions, which were expressed as the relative standard deviation (RSD), were no more than 0.76% and 1.51%, respectively. The recoveries were between 94.05% and 109.68% in several medicinal plants. The composite monolith showed low back pressure and high adsorption capacity for the enrichment and purification of ursolic acid.

中文翻译：

一种功能化的多壁碳纳米管基复合整体材料，作为固相萃取吸附剂，可在线纯化和富集药用植物中的熊果酸

以功能化的多壁碳纳米管（MWCNTs）和苯乙烯（ST）为共聚单体，以乙二醇二甲基丙烯酸酯（EDMA）为交联剂，制备了新型的聚（f-MWCNTs-共-ST-共-EDMA）整体结构。通过扫描电子显微镜（SEM），氮吸附-解吸等温线和压汞法测定了整料的表面形态和内部结构。整料具有均匀连续的结构和大的表面积。整料用作在线富集和纯化熊果酸的吸附剂。线性范围为0.0002–3.5 mg mL ^-1；检测限（LOD）和定量限（LOQ）分别为0.52μgmL ^-1和1.72μgmL ^-1，分别。日内和日间精度（分别表示为相对标准偏差（RSD））分别不超过0.76％和1.51％。在几种药用植物中，回收率在94.05％至109.68％之间。该复合整料对熊果酸的富集和纯化显示出低背压和高吸附能力。

更新日期：2020-02-13

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