Inhibitory effects of extracellular polymeric substances on ofloxacin sorption by natural biofilms

Zhang, Liwen; Dong, Deming; Xia, Hua; Guo, Zhiyong

doi:10.1016/j.scitotenv.2017.12.271

Cited by 56 publications

(24 citation statements)

References 52 publications

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“…This may be attributed to the fact that the loading of Co 3 (PO 4 ) 2 has an effect on the electron environment around Ag 3 PO 4 or there is a strong interaction between Co 3 (PO 4 ) 2 and Ag 3 PO 4 . The same result was reported by Zhang et al 17 XPS signals of P 2p observed at binding energies around 132.8 eV were attributed to P of PO 4 3− (Fig. 1(c)).…”

Section: Results and Discussion Characterizationsupporting

confidence: 88%

“…However, their use and subsequent discharge into the environment may be a risk to aquatic and terrestrial organisms because of their high chemical stability, low biodegradability and the evolution of resistant microorganisms . For example, ofloxacin (OFX) is a frequently detected FQ antibiotic in various environmental samples such as wastewater treatment plant effluents, sea waters and surface waters in concentrations ranging from ng L −1 to µg L −1 . Previous studies demonstrated that FQs were subject to degradation in aqueous systems, mineralization of these compounds is often incomplete and many of the organic products identified retain the core quinolone ring structure, which is essential to FQs' antibacterial activities .…”

Section: Introductionmentioning

confidence: 99%

“…3 For example, ofloxacin (OFX) is a frequently detected FQ antibiotic in various environmental samples such as wastewater treatment plant effluents, sea waters and surface waters in concentrations ranging from ng L −1 to μg L −1 . [3][4][5] Previous studies demonstrated that FQs were subject to degradation in aqueous systems, mineralization of these compounds is often incomplete and many of the organic products identified retain the core quinolone ring structure, which is essential to FQs' antibacterial activities. [6][7][8] The quantitative efficacy of various treatment processes for removing antibacterial activity remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Geng

Yang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Ofloxacin is a frequently detected fluoroquinolone antibiotic in wastewater treatment plant effluents, sea waters and surface waters. Photocatalytic technology is considered to be the most promising treatment technology for the removal of ofloxacin. However, it is a big challenge to exploit a novel sunlight‐driven photocatalyst and reveal the mechanism of ofloxacin degradation. RESULTS Co3(PO4)2/Ag3PO4 composites were prepared using a facile hydrothermal synthesis method. The structural, morphological and optical properties of the composites were well characterized. Both the degradation efficiency and cyclical stability of the Co3(PO4)2/Ag3PO4 composites increased significantly under simulated sunlight irradiation when ofloxacin (OFX) or methyl orange (MO) was used as the target molecule, as compared with single‐phase Ag3PO4 and Co3(PO4)2. The reduction of antimicrobial activity for 8%Co3(PO4)2/Ag3PO4 reached 88.8% after 5 min of sunlight irradiation. CONCLUSION Co3(PO4)2 played a critical role in suppressing carrier recombination and provided a large number of photogenerated holes and •O2− to oxidize OFX or MO. The OFX degradation mechanism included piperazinyl dealkylation, decarboxylation and defluorination. The reduction of antimicrobial activity for degradation byproducts was obvious after simulated sunlight irradiation over Co3(PO4)2/Ag3PO4. Therefore Co3(PO4)2/Ag3PO4 is an attractive candidate for the removal of OFX. © 2019 Society of Chemical Industry

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Section: Results and Discussion Characterizationsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Geng

Yang

et al. 2019

J of Chemical Tech & Biotech

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“…41 The absorption band near 3416 cm À1 represents the stretching vibration of O-H in KGM; 40 the peak at 1252 cm À1 is due to the C-N stretching in Enro. 42 The characteristic stretching vibrations noticed at 1172 cm À1 are due to C-F in PVDF. 41 The KGM/ PVDF or KGM/PVDF/Enro hybrid microber stretching frequencies shi to lower wavelengths at absorption band near 3416 cm À1 , and the stretching vibrations become weaker at the absorption band at 1172 cm À1 versus KGM or PVDF ( Fig.…”

Section: The Characterization Of Hybrid Microbersmentioning

confidence: 99%

Robust microfluidic construction of hybrid microfibers based on konjac glucomannan and their drug release performance

Lin

et al. 2018

RSC Adv.

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The exploration of methods to produce a novel wound dressing with sustained drug release properties in ultrasmall scales is of great scientific and technological interest. Herein, we propose konjac glucomannan/ polyvinylidene fluoride (KGM/PVDF) hybrid microfibers having hydrophilic and hydrophobic segments based on microfluidic-oriented core-sheath composite microfibers, where the KGM/PVDF hybrid microfibers are wrapped in situ in CH 3 OH. The morphology of KGM/PVDF microfibers is uniform, smooth, and crack-free. Enrofloxacin (Enro) is loaded onto the microfibers as a representative cargo to test their release performance. The KGM/PVDF/Enro microfibers show sustained drug release performance (13 days), excellent heat resistance, antibacterial activity and promotion of wound healing.This study is an avenue toward the microfluidic design of hydrophilic/hydrophobic hybrid microfibers as wound dressings, and it will guide the development of next-generation wound dressing. † Electronic supplementary information (ESI) available. See

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“…Biofilms in aquatic environments are generally composed by diverse microorganisms entrapped in a matrix of EPS produced by their own. The EPS matrix, mainly composed by polysaccharides, proteins, lipids, and nucleic acids, plays an important role in the sorption of contaminants 48 . In addition, aquatic biofilms can be used as indicators of the overall water quality 49 , and have been used in ecotoxicological studies to evaluate the impact of multiple stressors in the ecosystem 50 .…”

Section: Microbial Ecotoxicology Of Ecsmentioning

confidence: 99%

Emerging contaminants affect the microbiome of water systems—strategies for their mitigation

et al. 2020

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The presence of emerging contaminants (ECs) in the environment has been consistently recognized as a worldwide concern. ECs may be defined as chemicals or materials found in the environment at trace concentrations with potential, perceived, or real risk to the “One Health” trilogy (environment, human, and animal health). The main concern regarding pharmaceuticals and in particular antibiotics is the widespread dissemination of antimicrobial resistance. Nevertheless, non-antimicrobials also interact with microorganisms in both bulk phase and in biofilms. In fact, drugs not developed for antimicrobial chemotherapy can exert an antimicrobial action and, therefore, a selective pressure on microorganisms. This review aims to provide answers to questions typically ignored in epidemiological and environmental monitoring studies with a focus on water systems, particularly drinking water (DW): Do ECs exposure changes the behavior of environmental microorganisms? May non-antibiotic ECs affect tolerance to antimicrobials? Do ECs interfere with biofilm function? Are ECs-induced changes in microbial behavior of public health concern? Nowadays, the answers to these questions are still very limited. However, this study demonstrates that some ECs have significant effects in microbial behavior. The most studied ECs are pharmaceuticals, particularly antibiotics, carbamazepine and diclofenac. The pressure caused by antibiotic and other antimicrobial agents on the acquisition and spread of antibiotic resistance seems to be unquestionable. However, regarding the effects of ECs on the development and behavior of biofilms, the conclusions of different studies are still controversial. The dissimilar findings propose that standardized tests are needed for an accurate assessment on the effects of ECs in the microbiome of water systems. The variability of experimental conditions, combined with the presence of mixtures of ECs as well as the lack of information about the effects of non-pharmaceutical ECs constitute the main challenge to be overcome in order to improve ECs prioritization.

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Inhibitory effects of extracellular polymeric substances on ofloxacin sorption by natural biofilms

Cited by 56 publications

References 52 publications

Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Robust microfluidic construction of hybrid microfibers based on konjac glucomannan and their drug release performance

Emerging contaminants affect the microbiome of water systems—strategies for their mitigation

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Inhibitory effects of extracellular polymeric substances on ofloxacin sorption by natural biofilms

Cited by 56 publications

References 52 publications

Co3(PO4)2/Ag3PO4 with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Co3(PO4)2/Ag3PO4 with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Robust microfluidic construction of hybrid microfibers based on konjac glucomannan and their drug release performance

Emerging contaminants affect the microbiome of water systems—strategies for their mitigation

Contact Info

Product

Resources

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Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight

Co₃(PO₄)₂/Ag₃PO₄ with enhanced simulated sunlight photocatalytic activity toward ofloxacin degradation and mechanism insight