Low-molecular-weight organic acids correlate with cultivar variation in ciprofloxacin accumulation in Brassica parachinensis L.

Hai-Ming ZHAO, Lei XIANG, Xiao-Lian WU, Yuan-Neng JIANG, Hui LI, Yan-Wen LI, Quan-Ying CAI, Ce-Hui MO, Jie-Sheng LIU, Ming Hung WONG

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Abstract

To understand the mechanism controlling cultivar differences in the accumulation of ciprofloxacin (CIP) in Chinese flowering cabbage (Brassica parachinensis L.), low-molecular-weight organic acids (LMWOAs) secreted from the roots of high- and low-CIP cultivars (Sijiu and Cutai, respectively) and their effects on the bioavailability of CIP in soil were investigated. Significant differences in the content of LMWOAs (especially maleic acid) between the two cultivars played a key role in the variation in CIP accumulation. Based on the Freundlich sorption coefficient (Kf) and distribution coefficient (Kd), the presence of LMWOAs reduced the CIP sorption onto soil particles, and higher concentrations of LMWOAs led to less CIP sorption onto soil. On the other hand, LMWOAs enhanced CIP desorption by lowering the solution pH, which changed the surface charge of soil particles and the degree of CIP ionization. LMWOAs promoted CIP desorption from soil by breaking cation bridges and dissolving metal cations, particularly Cu²⁺. These results implied that the LMWOAs (mainly maleic acid) secreted from Sijiu inhibited CIP sorption onto soil and improved CIP desorption from soil to a greater extent than those secreted from Cutai, resulting in higher bioavailability of CIP and more uptake and accumulation of CIP in the former. Copyright © 2017 The Author(s).
Original languageEnglish
Article number10301
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - Dec 2017

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Brassica rapa var. parachinensis
ciprofloxacin
organic acids and salts
molecular weight
cultivars
sorption
maleic acid
soil
desorption
bioavailability
cations

Citation

Zhao, H.-M., Xiang, L., Wu, X.-L., Jiang, Y. N., Li, H., Li, Y.-W., et al. (2017, December). Low-molecular-weight organic acids correlate with cultivar variation in ciprofloxacin accumulation in Brassica parachinensis L. Scientific Reports, 7, Article 10301. Retrieved October 20, 2017, from http://dx.doi.org/10.1038/s41598-017-10701-7