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首页> 外文期刊>RSC Advances >Spherical covalent organic frameworks as advanced adsorbents for preconcentration and separation of phenolic endocrine disruptors, followed by high performance liquid chromatography
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Spherical covalent organic frameworks as advanced adsorbents for preconcentration and separation of phenolic endocrine disruptors, followed by high performance liquid chromatography

机译：球形共价有机骨架作为先进的吸附剂，用于苯酚内分泌干扰物的预浓缩和分离，然后进行高效液相色谱

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As a promising generation of porous micro-materials, covalent organic frameworks (COFs) have great potentials for applications in separation and adsorption. In the present study, an advanced food-safety inspection method involving COFs as the adsorbents of solid phase extraction (SPE) is proposed for sensitive and accurate determination of target hazardous substances. Typical spherical TpBD COFs with large surface area and superior chemical stability were utilized as adsorbents for the preconcentration of phenolic endocrine disruptors (PEDs), followed by high performance liquid chromatography (HPLC) analysis. The well-prepared TpBD COFs were encapsulated in SPE cartridges and applied in food research, namely, for the separation and enrichment of four target endocrine disruptors in food samples. The possible factors influencing the SPE performance including the composition of the sample solvent, sample solution pH, sample flow rate, composition of the eluent, and the volume of the eluent were investigated and optimized. Due to the porous architecture and superior surface area of spherical TpBD, the enrichment of analytes via a COF-filled SPE column gave extremely low detection limits of 0.056–0.123 μg L ~(?1) along with a wide linear range of 0.5–100 μg L ~(?1) for all the analytes. Nine parallel determinations of the mixed standard with a concentration of 10 μg L ~(?1) produced the relative standard deviations of 2.23–3.08%, indicating the excellent repeatability of the COF-SPE assay. This study can open up a new route for the employment of COFs as efficient SPE adsorbents for the enrichment and quantification of trace/ultra-trace hazardous materials in complex food samples.
机译：作为多孔微材料的有希望的一代，共价有机骨架（COF）在分离和吸附中具有巨大的应用潜力。在本研究中，提出了一种以COFs作为固相萃取（SPE）吸附剂的先进食品安全检查方法，用于敏感，准确地确定目标有害物质。典型的具有大表面积和优异化学稳定性的球形TpBD COF被用作吸附剂，用于预浓缩酚类内分泌干扰物（PED），然后进行高效液相色谱（HPLC）分析。制备充分的TpBD COF封装在SPE药筒中，并用于食品研究，即用于食品样品中四种目标内分泌干扰物的分离和富集。研究并优化了影响SPE性能的可能因素，包括样品溶剂的组成，样品溶液的pH值，样品流速，洗脱液的组成和洗脱液的体积。由于多孔TpBD的多孔结构和优越的表面积，通过填充COF的SPE色谱柱对分析物的富集提供了极低的检测限0.056–0.123μgL〜（？1），以及0.5–100的宽线性范围所有分析物的微克L〜（？1）。浓度为10μgL〜（？1）的混合标准品的9种平行测定产生的相对标准偏差为2.23–3.08％，表明COF-SPE测定具有极好的可重复性。这项研究可以为使用COF作为有效的SPE吸附剂开辟一条新途径，以富集和定量复杂食品样品中痕量/超痕量的有害物质。

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