ISSN 1000-3665 CN 11-2202/P

    包气带中手性抗生素的环境行为研究进展

    Review of environmental fate of chiral antibiotics in the vadose zone

    • 摘要: 目前,手性抗生素在包气带中的检测、分布、迁移转化等方面缺乏系统总结和全面综述。文章指出手性抗生素不同异构体的物理化学性质存在差异,例如左旋吉米沙星的溶解度、辛醇-水分配系数分别是右旋吉米沙星的301倍、9.8倍,会影响其在环境中的迁移转化。高效液相色谱-手性色谱柱法和手性配体交换色谱法是目前最常用的分析手性抗生素的方法。梳理了国内外土壤、水体和农产品中手性抗生素的检出情况,其中最常见的是氟甲喹、洛美沙星、氧氟沙星等。手性抗生素在矿物和微塑料上的吸附速率和分配系数均存在差异,天然有机物的存在导致差异更大,但是不同种类手性抗生素之间并没有规律。手性抗生素会与地下水中的常见阳离子发生络合作用,络合物的稳定常数不同,例如镁离子-左氧氟沙星络合物的稳定常数是镁离子-氧氟沙星络合物的22.9倍。在生物降解过程中,不同手性抗生素的可降解性、降解速率不同,另外,抗生素异构体之间还会发生相互转化。文章系统阐述了手性抗生素在包气带中的分布情况和迁移转化行为,可供地下水系统中手性抗生素方面的研究参考。研究认为对于包气带中手性抗生素的环境行为,亟需开展以下研究:(1)手性抗生素的拆分、检测、毒理学和标准建设;(2)多种手性抗生素的调查、迁移转化;(3)手性抗生素的多界面环境过程。

       

      Abstract: To date, the systematic summarization and comprehensive review of analysis, distribution, migration, and degradation of chiral antibiotics in the vadose zone are limited. This review indicates that the physicochemical characteristics of chiral antibiotics are quite different, for instance, the solubility and octanol-water partition coefficient (lg Kow) of S-gemifloxacin are 301 times and 9.8 times larger than the values of R-gemifloxacin, which will affect their migration and degradation in the environment. High performance liquid chromatography with chiral column and chiral ligand-exchange chromatography are the common methods on the chiral antibiotics analysis. The concentrations of chiral antibiotics in soils, waters, and agricultural products in China and abroad are reported; flumequine, lomefloxacin and ofloxacin are the most common antibiotics. The adsorption rate and partition coefficient (Kd) of chiral antibiotics during their adsorption on minerals and microplastics are different, especially in the presence of natural organic matter (NOM); however, there is no relationship among the various types of chiral antibiotics. Chiral antibiotics can be complexed with the common cations, and their stability constants are quite different in the groundwater, for instance, the stability constant of Mg2+-levofloxacin is 22.9 times larger than that of Mg2+-ofloxacin. During the biodegradation process, the degradability and rate of chiral antibiotics are also different. Additionally, the chiral antibiotics can be transformed reciprocally. In this review, the distribution, migration, and degradation of chiral antibiotics in the vadose zone are investigated, which is beneficial to the study on the chiral antibiotics in the groundwater. As to the environmental fate of chiral antibiotics in the vadose zone, the following researches are recommended: (1) the resolution, analysis, toxicology, and standard establishment of chiral antibiotics; (2) the investigation, migration, and degradation of multiple chiral antibiotics; (3) the environmental processes of chiral antibiotics in the multi-interface.

       

    /

    返回文章
    返回