• 关键词：抗生素  氟喹诺酮类（FQs）  植物器官  根-枝-叶  吸收及转运  植物器官转移因子  红树植物

• 基金项目：国家自然科学基金（No.41171416）；中央高校基本科研业务费专项资金

• 于菲
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室, 广州 510275

• 孙勤寓
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室, 广州 510275

• 刘玉
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室, 广州 510275

• 彭逸生
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室, 广州 510275

• 任珂君
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室, 广州 510275

• 摘要：红树林高位养殖中抗生素氟喹诺酮类（FQs）有较多残留，但目前关于红树植物对抗生素的吸收及器官转运特征鲜有研究.本研究采用高效液相色谱-质谱联用法定量分析了广东镇海湾的两种优势红树植物桐花（Aegiceras corniculatum）、秋茄（Kandelia candel）根、枝、叶中4种FQs—氧氟沙星（OFL）、诺氟沙星（NOR）、环丙沙星（CIP）、恩诺沙星（ENR）的含量，用植物器官转移因子（PF）的方法评价了4种FQs在植物体内的转移能力，探讨了植物含脂率（LR）对器官中FQs残留的影响.结果表明：两种红树植物器官中均有4种FQs检出；OFL、NOR、ENR的含量在桐花树中为：枝（6.36~12.23 μg·kg^-1）>叶（4.05~10.92 μg·kg^-1）和根（5.01~10.47 μg·kg^-1），秋茄中为：根（6.27~24.70 μg·kg^-1）>叶（5.74~10.98 μg·kg^-1）>枝（3.63~7.00 μg·kg^-1），CIP不符合此规律.4种FQs的根向枝/叶转移因子PF_TL/R皆为PF_TL/R（桐花树）> PF_TL/R（秋茄）>1，说明桐花树、秋茄根部的FQs均可向地上部分大量转移，且桐花树根部向地上部分转运FQs的能力比秋茄强；桐花树对FQs有吸收及转运作用，秋茄的根则对FQs的吸收作用较强.LR的高低不是4种FQs吸收和转运的关键影响因子.

• Abstract：Although antibiotics fluoroquinolones (FQs) have been widely detected in mangrove wetlands, the absorption and transport behaviors of FQs by mangal plants were rarely explored. In this study we analyzed four FQs, ofloxacin (OFL), norfloxacin (NOR), ciprofloxacin (CIP) and enrofloxacin (ENR) in plant organs root-twig-leaf of two dominant mangal plants (i.e., Aegiceras corniculatum and Kandelia candel) from Zhenhai Bay Mangrove Nature Reserve, Guangdong Province. Liquid chromatograph-mass spectrometer was used for chemical analysis. The plant-organ-transfer factor (PF) was proposed to measure the metastatic ability of four FQs in plants, and the effects of lipid ratio (LR) in organs on FQs residue were also discussed. The results show that the four FQs were present in all organs of two mangal plants. In A. corniculatum, the concentrations of OFL, ENR and NOR in twig (6.36~12.23 μg·kg^-1) were higher than those in leaf (4.05~10.92 μg·kg^-1) and root (5.01~10.47 μg·kg^-1); in K. candel, however, the concentrations of OFL, ENR and NOR were in the following order:root (6.27~24.70 μg·kg^-1) > leaf (5.74~10.98 μg·kg^-1) > twig (3.63~7.00 μg·kg^-1). PF_TL/R, root to twig and root to leaf for 4 FQs, of A. corniculatum is higher than that of K. candel, both higher than 1. This indicates that A. corniculatum showed higher ability to transport FQs from roots to upper parts than K. candel. A. corniculatum had greater potential to absorb and transport FQs while K. candel had stronger absorbing capability of roots. LR was not the key factors to affect the absorption and transport of FQs.

• Key words：antibiotics  fluoroquinolones  plant organs  root-twig-leaf  absorption and transport  plant-organ-transfer factor (PF)  mangal plants

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