色谱 ›› 2025, Vol. 43 ›› Issue (8): 915-925.DOI: 10.3724/SP.J.1123.2024.08001

• 研究论文 • 上一篇    下一篇

在线固相萃取净化-超高效液相色谱-串联质谱法测定海洋沉积物中22种抗生素

王兰香1, 陈军辉2,3,*(), 盛璨璨1,2, 范圣晴1,2, 何秀平2,3, 李先国1   

  1. 1.中国海洋大学,海洋化学理论与工程技术教育部重点实验室,山东 青岛 266100
    2.自然资源部第一海洋研究所,青岛市现代分析与近海生态环境安全保障重点实验室,山东 青岛 266061
    3.青岛海洋科技中心,海洋生态与环境科学功能实验室,山东 青岛 266071
  • 收稿日期:2024-08-01 出版日期:2025-08-08 发布日期:2025-07-28
  • 通讯作者: Tel:(0532)88966705,E-mail:jhchen@fio.org.cn.
  • 基金资助:
    国家自然科学基金-山东联合基金(U2106205)

Determination of 22 antibiotics in marine sediments by online solid-phase extraction purification-ultra-high performance liquid chromatography-tandem mass spectrometry

WANG Lanxiang1, CHEN Junhui2,3,*(), SHENG Cancan1,2, FAN Shengqing1,2, HE Xiuping2,3, LI Xianguo1   

  1. 1. Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China
    2. Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China
    3. Laboratory for Marine Ecology and Environmental Science,Qingdao Marine Science and Technology Center,Qingdao 266071,China
  • Received:2024-08-01 Online:2025-08-08 Published:2025-07-28
  • Supported by:
    National Natural Science Foundation of China-Shandong Joint Fund(U2106205)

摘要:

本研究将在线固相萃取(SPE)技术与超高效液相色谱-串联质谱(UHPLC-MS/MS)技术结合,建立了一种检测海洋沉积物中22种常见抗生素的新方法,并将该方法用于近海海湾沉积物中抗生素的分析检测。通过对样品提取条件及在线SPE条件的系统优化,获得了最佳实验条件。沉积物样品经乙腈-EDTA/McIlvaine缓冲溶液(1∶1,v/v)提取后,用超纯水稀释,采用以大孔苯乙烯/二乙烯基苯为填料的PLRP-S在线SPE柱净化富集后,通过Poroshell EC-C18色谱柱(50 mm×2.1 mm,1.9 µm)分离;在电喷雾电离、正离子模式下,以多反应监测(MRM)模式进行检测,整个分析流程可在14 min内完成。结果表明,22种抗生素在各自的质量浓度范围内具有良好的线性关系,相关系数(R2)均≥0.990 0,检出限(LOD,S/N=3)为0.001~0.08 ng/g,定量限(LOQ,S/N=10)为0.004~0.4 ng/g。在低、中、高3个加标水平下,22种抗生素的加标回收率为45.1%~145.6%,相对标准偏差(RSD)<14%。采用该方法对山东近海四十里湾冬季和夏季沉积物样品中的抗生素进行检测,结果显示,在9个夏季沉积物样品中共检出5类19种抗生素,含量为0.01~34.64 ng/g,其中土霉素的检出水平最高;在10个冬季沉积物样品中共检出5类20种抗生素,含量为0.004~19.11 ng/g,其中氧氟沙星的检出水平最高。与常用的离线SPE方法相比,该方法大大简化了样品的净化处理过程,为海洋沉积物中常见抗生素的日常检测提供了一种简便且有效的方法。

关键词: 在线固相萃取, 超高效液相色谱-串联质谱, 沉积物, 抗生素, 四十里湾

Abstract:

This study developed a novel method for the detection of 22 antibiotics in marine sediments by integrating online solid-phase extraction(SPE) with ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS). The method was subsequently applied to the analytical determination of antibiotics in offshore bay sediments. Optimal experimental conditions were established through systematic optimization of sample extraction and online SPE parameters. Sediment samples were extracted using an acetonitrile-EDTA/McIlvaine buffer solution(1∶1, v/v), diluted with ultrapure water, and then purified and enriched using a large-pore styrene/divinylbenzene-packed PLRP-S online SPE column. The processed samples were separated on a Poroshell EC-C18 column(50 mm×2.1 mm, 1.9 µm) and detected in electrospray ionization(ESI) positive ion mode with multiple reaction monitoring(MRM) acquisition. The entire analytical process was completed within 14 min. The results showed that the 22 antibiotics showed good linearity in their respective mass concentration ranges with the correlation coefficients(R2)≥0.990 0, the limits of detection(LODs, S/N=3) were 0.001‒0.08 ng/g, and the limits of quantification(LOQs, S/N=10) were 0.004‒0.4 ng/g. The spiked recoveries of the 22 antibiotics under three spiked levels(low, medium and high) were 45.1%‒145.6% with the relative standard deviations(RSDs)<14%. The method was used to detect antibiotics in winter and summer sediment samples from Shandong Sishili Bay offshore. The results showed that a total of 19 antibiotics from five classes were detected in nine summer sediment samples, with the contents ranging from 0.01 to 34.64 ng/g; and oxytetracycline exhibited the highest detection level. A total of 20 antibiotics from five classes were detected in 10 winter sediment samples, with the contents ranging from 0.004-19.11 ng/g; and ofloxacin showed the highest detection level. Compared with the commonly used offline SPE method, this method greatly simplifies the sample purification process and provides a simple and effective method for the routine detection of common antibiotics in marine sediments.

Key words: online solid-phase extraction(SPE), ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS), sediments, antibiotics, Sishili Bay

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