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中国精品科技期刊2020

磷酸酯共价有机框架固相萃取结合高效液相色谱快速检测蜂蜜中氟喹诺酮类抗生素

Rapid Determination of Fluoroquinolone Antibiotics in Honey by Solid Phase Extraction Based on a Phosphoester Covalent Organic Framework Coupled with High Performance Liquid Chromatography

  • 摘要: 本研究开发了基于磷酸酯共价有机框架材料(COF-Tb-TBBP)固相萃取(solid phase extraction,SPE)并与高效液相色谱(high performance liquid chromatography,HPLC)结合,构建了用于蜂蜜中5种氟喹诺酮类(fluoroquinolones,FQs)抗生素的快速、高灵敏检测新方法。通过溶剂热法制备磷酸酯共价有机框架COF-Tb-TBBP,对材料的结构形貌、表面功能基团等重要特性进行系统表征,优化了吸附剂用量、吸附时间、解吸溶剂和解吸溶剂用量等固相萃取关键参数,评估了快速检测方法的重现性和定量分析能力。结果显示COF-Tb-TBBP具有超大的比表面积和丰富的磷酸酯功能位点,能够与FQs抗生素实现快速且选择性结合。通过条件优化,吸附剂用量为10 mg,吸附时间为3 min,洗脱剂为2 mL 5%甲酸乙腈溶液,HPLC方法检出限度为0.002~0.003 mg/kg,加标回收率为92.52%~98.95%,结果可用于蜂蜜中超痕量FQs抗生素的快速高灵敏检测。综上所述,基于COF-Tb-TBBP构建的固相萃取-高效液相色谱法为蜂蜜中痕量FQs抗生素快速、高灵敏检测提供了新的解决方案,具有良好的实际应用价值。

     

    Abstract: A novel and sensitive analytical method was developed for the rapid detection of five fluoroquinolone (FQ) antibiotics in honey, utilizing solid-phase extraction (SPE) based on a phosphonate functionalized covalent organic framework (COF-Tb-TBBP) in conjunction with high-performance liquid chromatography (HPLC). The COF-Tb-TBBP material was synthesized via a solvothermal method, followed by comprehensive characterization of its morphological features and surface chemistry. Key parameters affecting extraction efficiency, such as adsorbent dosage, adsorption time, desorption solvent and desorption solvent dosage, were optimized via comprehensive evaluations. Experimental evaluations revealed that the COF-Tb-TBBP exhibited an exceptionally high surface area and abundant phosphonate binding sites, facilitating rapid and selective interactions with FQ molecules. Optimal extraction conditions were established as follows: 10 mg of adsorbent, a 3-min adsorption period, and elution with 2 mL of 5% formic acid in acetonitrile. Under these conditions, the method achieved detection limits as low as 0.002~0.003 mg/kg and yielded spiked recoveries ranging from 92.52% to 98.95%. These results underscore the method's effectiveness for trace-level quantification of FQs in honey. Overall, the SPE-HPLC platform based on COF-Tb-TBBP offers a robust, efficient, and practical solution for the monitoring of antibiotic residues in food safety applications.

     

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