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Abbas MA, Lee EB, Boby N, Biruhanu BT, Park SC. A pharmacodynamic investigation to assess the synergism of orbifloxacin and propyl gallate against Escherichia coli. Front Pharmacol 2022; 13:989395. [PMID: 36188537 PMCID: PMC9521280 DOI: 10.3389/fphar.2022.989395] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/24/2022] [Indexed: 11/26/2022] Open
Abstract
Escherichia coli (E. coli) infections are becoming increasingly difficult to treat, as antibiotic-resistant variants proliferate. Studies on novel methods to combat the spread of resistance and improve the performance of current antibiotics are vital. We aimed to boost the efficacy of the antibiotic orbifloxacin (ORB) against E. coli by combining it with a phenolic component, propyl gallate (PG). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of ORB against the E. coli KVCC 1423 resistant strain were 128 μg/ml and 256 μg/ml, respectively. However, the MIC of ORB for the remaining E. coli strains was 0.5 μg/ml–2 μg/ml. For the combination of PG and ORB, the lowest fractional inhibitory concentration (FIC) index was less than 0.5, and the combination decreased the MIC of both drugs by 74%. The time-kill assay revealed the killing properties of both the drugs and the pharmacodynamic model (PD model) confirmed the strong killing properties of the combination as compared to the individual activities of the drugs. The ratio between MIC and mutant prevention concentration of ORB against E. coli 1400306 and 1,423 were 1:32 and 1:8, respectively. The combination of ORB and PG showed strong biofilm eradication and inhibited the motility of bacteria. The cell viability of the combination was > 80%. Therefore, we believe that ORB and PG in combination could be a possible antibacterial candidate that could minimize resistance and improve antibiotic potential.
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Affiliation(s)
- Muhammad Aleem Abbas
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, Cardiovascular Institute, College of Veterinary Medicine, Kyungpook National University, Daegu, Gyeongsangbuk-do, South Korea
| | - Eon-Bee Lee
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, Cardiovascular Institute, College of Veterinary Medicine, Kyungpook National University, Daegu, Gyeongsangbuk-do, South Korea
| | - Naila Boby
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, Cardiovascular Institute, College of Veterinary Medicine, Kyungpook National University, Daegu, Gyeongsangbuk-do, South Korea
| | - Biruk Tesfaye Biruhanu
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, Cardiovascular Institute, College of Veterinary Medicine, Kyungpook National University, Daegu, Gyeongsangbuk-do, South Korea
- *Correspondence: Biruk Tesfaye Biruhanu, ; Seung-Chun Park,
| | - Seung-Chun Park
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, Cardiovascular Institute, College of Veterinary Medicine, Kyungpook National University, Daegu, Gyeongsangbuk-do, South Korea
- Cardiovascular Research Institute, Kyungpook National University School of Medicine, Daegu, Gyeongsangbuk-do, South Korea
- *Correspondence: Biruk Tesfaye Biruhanu, ; Seung-Chun Park,
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2
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Application of Samarium- and Terbium-Sensitized Luminescence via a Multivariate-Based Approach for the Determination of Orbifloxacin. J CHEM-NY 2022. [DOI: 10.1155/2022/4778830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
A lanthanide-based optical sensor has been developed for the sensitive and reliable spectrofluorometric determination of the fluoroquinolone antibiotic orbifloxacin (ORLX). Reaction of ORLX and two lanthanide metal ions, Sm(III) and Tb(III), in aqueous buffered solution produced highly fluorescent complexes. Plackett–Burman design (PBD) was used to explore the impact of four factors, pH, temperature (Temp), contact time (CT), and metal volume (MV), on the fluorescence intensity (FI) of the produced complexes. The obtained data showed that pH was the most significant variable. A blend of pH = 5.0, MV = 2.0 mL, T = 25°C, and CT = 10 min was used to achieve the maximum FI. FT-IR and Raman analyses were performed for the crystals of the as-prepared complexes. Obtained data showed shifting in most of the absorption bands, confirming the complexation of ORLX with both metal ions. Job’s method showed that the stoichiometry for the reaction of ORLX with Sm(III) and Tb(III) was 1 : 1. The proposed method was validated following the ICH guidelines. Injection formulation was analyzed successfully with the developed method with high recovery (99.42–100.91%). The detection and quantification limits were 0.987 and 3.289 ng/mL for the ORLX-Sm(III) complex and 1.020 and 3.399 ng/mL for the ORLX-Tb(III) complex, respectively.
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Kaur R, Rani P, Atanasov AG, Alzahrani Q, Gupta R, Kapoor B, Gulati M, Chawla P. Discovery and Development of Antibacterial Agents: Fortuitous and Designed. Mini Rev Med Chem 2021; 22:984-1029. [PMID: 34939541 DOI: 10.2174/1570193x19666211221150119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 11/22/2022]
Abstract
Today, antibacterial drug resistance has turned into a significant public health issue. Repeated intake, suboptimal and/or unnecessary use of antibiotics, and, additionally, the transfer of resistance genes are the critical elements that make microorganisms resistant to conventional antibiotics. A substantial number of antibacterials that were successfully utilized earlier for prophylaxis and therapeutic purposes have been rendered inadequate due to this phenomenon. Therefore, the exploration of new molecules has become a continuous endeavour. Many such molecules are at various stages of investigation. A surprisingly high number of new molecules are currently in the stage of phase 3 clinical trials. A few new agents have been commercialized in the last decade. These include solithromycin, plazomicin, lefamulin, omadacycline, eravacycline, delafloxacin, zabofloxacin, finafloxacin, nemonoxacin, gepotidacin, zoliflodacin, cefiderocol, BAL30072, avycaz, zerbaxa, vabomere, relebactam, tedizolid, cadazolid, sutezolid, triclosan and afabiacin. This article aims to review the investigational and recently approved antibacterials with a focus on their structure, mechanisms of action/resistance, and spectrum of activity. Delving deep, their success or otherwise in various phases of clinical trials is also discussed while attributing the same to various causal factors.
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Affiliation(s)
- Ravleen Kaur
- Department of Health Sciences, Cape Breton University, Sydney, Nova Scotia. Canada
| | - Pooja Rani
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara. India
| | - Atanas G Atanasov
- Ludwig Boltzmann Institute of Digital Health and Patient Safety, Medical University of Vienna, Vienna. Austria
| | - Qushmua Alzahrani
- Department of Pharmacy/Nursing/Medicine Health and Environment, University of the Region of Joinville (UNIVILLE) volunteer researcher, Joinville. Brazil
| | - Reena Gupta
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara . India
| | - Bhupinder Kapoor
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara . India
| | - Monica Gulati
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara . India
| | - Pooja Chawla
- Department of Pharmaceutical Chemistry and Analysis, ISF College of Pharmacy, Ghal Kalan Moga, Punjab 142001. India
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Rusu A, Lungu IA, Moldovan OL, Tanase C, Hancu G. Structural Characterization of the Millennial Antibacterial (Fluoro)Quinolones-Shaping the Fifth Generation. Pharmaceutics 2021; 13:pharmaceutics13081289. [PMID: 34452252 PMCID: PMC8399897 DOI: 10.3390/pharmaceutics13081289] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/12/2021] [Accepted: 08/14/2021] [Indexed: 12/12/2022] Open
Abstract
The evolution of the class of antibacterial quinolones includes the introduction in therapy of highly successful compounds. Although many representatives were withdrawn due to severe adverse reactions, a few representatives have proven their therapeutical value over time. The classification of antibacterial quinolones into generations is a valuable tool for physicians, pharmacists, and researchers. In addition, the transition from one generation to another has brought new representatives with improved properties. In the last two decades, several representatives of antibacterial quinolones received approval for therapy. This review sets out to chronologically outline the group of approved antibacterial quinolones since 2000. Special attention is given to eight representatives: besifloxacin, delafoxacin, finafloxacin, lascufloxacin, nadifloxacin and levonadifloxacin, nemonoxacin, and zabofloxacin. These compounds have been characterized regarding physicochemical properties, formulations, antibacterial activity spectrum and advantageous structural characteristics related to antibacterial efficiency. At present these new compounds (with the exception of nadifloxacin) are reported differently, most often in the fourth generation and less frequently in a new generation (the fifth). Although these new compounds' mechanism does not contain essential new elements, the question of shaping a new generation (the fifth) arises, based on higher potency and broad spectrum of activity, including resistant bacterial strains. The functional groups that ensured the biological activity, good pharmacokinetic properties and a safety profile were highlighted. In addition, these new representatives have a low risk of determining bacterial resistance. Several positive aspects are added to the fourth fluoroquinolones generation, characteristics that can be the basis of the fifth generation. Antibacterial quinolones class continues to acquire new compounds with antibacterial potential, among other effects. Numerous derivatives, hybrids or conjugates are currently in various stages of research.
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Affiliation(s)
- Aura Rusu
- Pharmaceutical and Therapeutical Chemistry Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (A.R.); (G.H.)
| | - Ioana-Andreea Lungu
- The Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (I.-A.L.); (O.-L.M.)
| | - Octavia-Laura Moldovan
- The Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (I.-A.L.); (O.-L.M.)
| | - Corneliu Tanase
- Pharmaceutical Botany Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania
- Correspondence: ; Tel.: +40-744-215-543
| | - Gabriel Hancu
- Pharmaceutical and Therapeutical Chemistry Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (A.R.); (G.H.)
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Lian S, Lian J, Wang G, Li L, Yang D, Xue Y. Investigation of binding between fluoroquinolones and pepsin by fluorescence spectroscopy and molecular simulation. LUMINESCENCE 2019; 34:595-601. [DOI: 10.1002/bio.3642] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 04/04/2019] [Accepted: 04/11/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Shu‐Qin Lian
- School of PharmacyXuzhou Medical University Xuzhou Jiangsu China
| | - Jie Lian
- College of Marine Life and FisheriesHuaihai Institute of Technology Lian Yungang Jiangsu China
| | - Gui‐Rong Wang
- School of PharmacyXuzhou Medical University Xuzhou Jiangsu China
| | - Lin Li
- School of Basic EducationXuzhou Medical University Xuzhou Jiangsu China
| | - Dong‐Zhi Yang
- School of PharmacyXuzhou Medical University Xuzhou Jiangsu China
| | - Yun‐sheng Xue
- School of PharmacyXuzhou Medical University Xuzhou Jiangsu China
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Rugani KDS, Kogawa AC, Salgado HRN. Review for Analytical Methods for the Determination of Sodium Cephalothin. Crit Rev Anal Chem 2018; 49:187-194. [PMID: 30518240 DOI: 10.1080/10408347.2018.1506697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Infections are the second leading cause of global morbidity and mortality, therefore it is highly important to study the antimicrobial agents such as cephalosporins. Cephalothin, an antimicrobial agent that belongs to the class of cephalosporins, has bactericidal activity and it is widely used in the Brazilian health system. In literature, some analytical methods are found for the identification and quantification of this drug, which are essential for its quality control, which ensures maintaining the product characteristics, therapeutic efficacy and patient's safety. The aim of this article is to review the available information on analytical methods for cephalothin. Thus, this study presents a literature review on cephalothin and the analytical methods developed for the analysis of this drug in official and scientific papers. It is essential to note that most of the developed methods used toxic and hazardous solvents, which makes necessary industries and researchers choose to develop environmental-friendly techniques, which will contribute to the harmonization of science, human, and environmental health.
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Affiliation(s)
- Karen de Souza Rugani
- a School of Pharmaceutical Sciences , São Paulo State University (UNESP) , Araraquara , São Paulo , Brazil
| | - Ana Carolina Kogawa
- a School of Pharmaceutical Sciences , São Paulo State University (UNESP) , Araraquara , São Paulo , Brazil
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Menezes MND, de Marco BA, Fiorentino FAM, Zimmermann A, Kogawa AC, Salgado HRN. Flucloxacillin: A Review of Characteristics, Properties and Analytical Methods. Crit Rev Anal Chem 2018; 49:67-77. [PMID: 29846080 DOI: 10.1080/10408347.2018.1468728] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Bacterial resistance is a growing and worrying factor. The high reproducibility of these resistant microorganisms tends to influence the development of new drugs and research related to product quality control. Among the existing antimicrobials, flucloxacillin (FLU) was designed for oral and injectable administration with bactericidal activity. FLU sodium is the form used in pharmaceutical formulations. It is an antimicrobial resistant against penicillinase, an enzyme responsible for cleaving the beta-lactam ring of penicilins, which leads to inactivity of the drug. Qualitative and quantitative analyzes are essential to ensure quality of pharmaceuticals and health of the population. It is important that quality control is effective and appropriate, only then we can win the battle against microbial resistance. In this work, we want to highlight tthe characteristics of FLU as an important antibiotic and methods for the determination of FLU in pharmaceutical products and biological matrices. Among the analytical methods described in the literature for the determination of FLU, high performance liquid chromatography (HPLC) stands out. Anyway, this method uses toxic solvents (e.g. acetonitrile) long columns, which provide long runs, as well as produces large amounts of waste. Currently, the priority changed to develop ecologically correct, conscious and sustainable methods. This new view on analytical methods should be applied to FLU analyzes and used to develop and improve existing methods.
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Affiliation(s)
- Mariana Nunes de Menezes
- a Laboratory of Applied Pharmacology, School of Health Sciences , Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS , Porto Alegre , Brazil
| | - Bianca Aparecida de Marco
- b São Paulo StateUniversity (UNESP) , School of Pharmaceutical Sciences, Campus Araraquara , Araraquara , SP , Brazil
| | | | - Alexander Zimmermann
- c Division for Pathobiochemistry,Martin Luther University Halle-Wittenberg , Faculty of Medicine, Institute of Molecular Medicine, Charles-Tanford-Proteinzentrum, Weinberg Campus , Halle , Germany
| | - Ana Carolina Kogawa
- b São Paulo StateUniversity (UNESP) , School of Pharmaceutical Sciences, Campus Araraquara , Araraquara , SP , Brazil
| | - Hérida Regina Nunes Salgado
- b São Paulo StateUniversity (UNESP) , School of Pharmaceutical Sciences, Campus Araraquara , Araraquara , SP , Brazil
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8
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Yang F, Yang F, Wang G, Shi W, Kong T, Yang P, Bai D, Zhou B. Pharmacokinetics of orbifloxacin in crucian carp (Carassius auratus) after intravenous and intramuscular administration. J Vet Pharmacol Ther 2018; 41:599-604. [PMID: 29465160 DOI: 10.1111/jvp.12495] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 01/28/2018] [Indexed: 11/26/2022]
Abstract
The pharmacokinetics of orbifloxacin was studied after a single dose (7.5 mg/kg) of intravenous or intramuscular administration to crucian carp (Carassius auratus) reared in freshwater at 25°C. Plasma samples were collected from six fish per sampling point. Orbifloxacin concentrations were determined by high-performance liquid chromatography with a 0.02 μg/ml limit of detection, then were subjected to noncompartmental analysis. After intravenous injection, initial concentration of 5.83 μg/ml, apparent elimination rate constant (λz ) of 0.039 hr-1 , apparent elimination half-life (T1/2λz ) of 17.90 hr, systemic total body clearance (Cl) of 75.47 ml hr-1 kg-1 , volume of distribution (Vz) of 1,948.76 ml/kg, and volume of distribution at steady-state (Vss) of 1,863.97 ml/kg were determined, respectively. While after intramuscular administration, the λz , T1/2λz , mean absorption time (MAT), absorption half-life (T1/2ka ), and bioavailability were determined as 0.027 hr-1 , 25.69, 10.26, 7.11 hr, and 96.46%, respectively, while the peak concentration was observed as 3.11 ± 0.06 μg/ml at 2.0 hr. It was shown that orbifloxacin was completely but relatively slowly absorbed, extensively distributed, and slowly eliminated in crucian carp, and an orbifloxacin dosage of 10 mg/kg administered intravenously or intramuscularly would be expected to successfully treat crucian carp infected by strains with MIC values ≤0.5 μg/ml.
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Affiliation(s)
- F Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China.,Jiangxi Bolai Pharmacy Co., Ltd., Jiujiang, China
| | - F Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - G Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - W Shi
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - T Kong
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - P Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - D Bai
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - B Zhou
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
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Yang F, Yang F, Shi W, Si H, Kong T, Wang G, Zhang J. Development of a multiroute physiologically based pharmacokinetic model for orbifloxacin in rabbits. J Vet Pharmacol Ther 2018; 41:622-631. [DOI: 10.1111/jvp.12496] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/28/2018] [Indexed: 12/25/2022]
Affiliation(s)
- F. Yang
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
| | - F. Yang
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
| | - W. Shi
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
| | - H. Si
- College of Animal Science and Technology; Guangxi University; Nanning China
| | - T. Kong
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
| | - G. Wang
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
| | - J. Zhang
- College of Animal Science and Technology; Henan University of Science and Technology; Luoyang China
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Shimizu T, Harada K, Manabe S, Tsukamoto T, Ito N, Hikasa Y. Assessment of urinary pharmacokinetics and pharmacodynamics of orbifloxacin in healthy dogs with ex vivo modelling. J Med Microbiol 2017; 66:616-621. [PMID: 28470147 DOI: 10.1099/jmm.0.000476] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The aim of this study was to investigate the urinary pharmacokinetics (PK) of orbifloxacin (OBFX) administered at 5 mg kg-1 in six healthy dogs. A further aim was to use an ex vivo model to evaluate the urinary PK and pharmacodynamics (PD) of OBFX to determine its urinary bactericidal titre (UBT), which represents the maximal dilution of urine allowing bactericidal activity. METHODOLOGY Fourteen urinary tract infection (UTI) pathogenic strains of five bacterial species (Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Proteus mirabilis and Staphylococcuspseudintermedius) were used. Urine samples were obtained every 4 h for the first 24 h after OBFX administration, for measurement of urine drug concentration and UBT.Results/Key findings. The urine OBFX concentration peaked at 0-4, 4-8 or 4-8 h after administration, with a maximum concentration of 383±171 µg ml-1. Overall, the fluctuation in median UBT closely correlated with that of the mean urine OBFX concentration. In addition, the median areas under the UBT-time curves (AUBTs) were significantly inversely correlated with the MICs for OBFX in the tested strains (P<0.01). Notably, median UBTs and AUBTs were extremely low (0-0.5 and 2-5, respectively) in OBFX-resistant E. coli strains with MIC ≥8 µg ml-1. CONCLUSION The fluctuation of UBTs closely correlated with that of urine concentration, and UBT values depended on the susceptibility of the bacterial strains to OBFX. We believe that ex vivo modelling to determine UBTs is useful to evaluate the urinary PK/PD of antimicrobials indicated for UTIs in dogs.
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Affiliation(s)
- Takae Shimizu
- The United Graduate School of Veterinary Science, Yamaguchi University, 1677-1, Yoshida, Yamaguchi 753-8511, Japan.,Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
| | - Kazuki Harada
- The United Graduate School of Veterinary Science, Yamaguchi University, 1677-1, Yoshida, Yamaguchi 753-8511, Japan.,Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
| | - Saki Manabe
- Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
| | - Taku Tsukamoto
- Global Application Development Center Analytical & Measuring Instruments Division, Shimadzu Corporation, 1 Nishinokyo, Kuwahara-cho, Nakagyo-ku, Kyoto 604-8511, Japan
| | - Norihiko Ito
- Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
| | - Yoshiaki Hikasa
- The United Graduate School of Veterinary Science, Yamaguchi University, 1677-1, Yoshida, Yamaguchi 753-8511, Japan.,Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
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11
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Shimizu T, Harada K. Determination of minimum biofilm eradication concentrations of orbifloxacin for canine bacterial uropathogens over different treatment periods. Microbiol Immunol 2017; 61:17-22. [PMID: 28042660 DOI: 10.1111/1348-0421.12461] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 12/23/2016] [Accepted: 12/27/2016] [Indexed: 12/01/2022]
Abstract
Biofilm formation can cause refractory urinary tract infections (UTIs) in dogs; however, minimum biofilm eradication concentrations (MBECs) of veterinary drugs against canine uropathogens remain to be investigated. In this study, the MBECs of orbifloxacin (OBFX), trimethoprim-sulfamethoxazole (TMS) and amoxicillin/clavulanate (ACV) over different time periods for treatment of canine uropathogenic Escherichia coli (n = 10) were determined. The MBECs of OBFX for other bacterial uropathogens, including Staphylococcus pseudintermedius (n = 5), Pseudomonas aeruginosa (n = 5), Klebsiella pneumoniae (n = 5) and Proteus mirabilis (n = 5) were also determined. Minimum inhibitory concentrations (MICs) were identified for all strains by broth microdilution, and MBECs were determined at 24, 72, and 168 hr using the Calgary biofilm method. The 24 hr MBECs of OBFX, TMS and ACV for the E. coli strains were significantly higher than the MICs (P < 0.05), and the 72 and 168 hr MBECs were significantly lower than those at 24 hr (P < 0.05). In addition, the 24 hr OBFX MBECs for the four other uropathogens were significantly higher than the corresponding MICs (P < 0.05). The 72 and/or 168 hr OBFX MBECs for S. pseudintermedius, K. pneumoniae and P. mirabilis were significantly lower than the 24 hr concentrations (P < 0.05), whereas for P. aeruginosa, no significant difference was found between any of the MBECs (P > 0.05). These data indicate that the administration period and uropathogenic bacterial species are important factors affecting the efficacy of OBFX treatment of biofilm-related UTIs in dogs.
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Affiliation(s)
- Takae Shimizu
- United Graduate School of Veterinary Science, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8511.,Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
| | - Kazuki Harada
- United Graduate School of Veterinary Science, Yamaguchi University, 1677-1, Yoshida, Yamaguchi, 753-8511.,Joint Department of Veterinary Medicine, Tottori University, Minami 4-101, Koyama-Cho, Tottori 680-8553, Japan
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He K, Blaney L. Systematic optimization of an SPE with HPLC-FLD method for fluoroquinolone detection in wastewater. JOURNAL OF HAZARDOUS MATERIALS 2015; 282:96-105. [PMID: 25200119 DOI: 10.1016/j.jhazmat.2014.08.027] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 07/10/2014] [Accepted: 08/19/2014] [Indexed: 06/03/2023]
Abstract
This paper describes a selective and ultra-sensitive analytical method for simultaneous determination of 11 fluoroquinolone (FQ) antibiotics in environmental and wastewater samples. The method employs offline solid-phase extraction (SPE) and reversed-phase high performance liquid chromatography with fluorescence detection (HPLC-FLD). A weak cation exchange SPE protocol was developed with a novel loading volume optimization algorithm and a methanol cleanup step to remove background organic matter. Various parameters were optimized to recover FQs from water/wastewater and analyte recovery was generally greater than 80%. Chromatographic separation of the 11 FQs was achieved on a 150 mm pentafluorophenyl column using a gradient elution scheme with methanol, acetonitrile, and 20mM phosphate buffer (pH=2.4). Excitation and emission wavelengths were individually optimized for each FQ using fluorescence spectroscopy; the excitation and emission wavelengths were 276-296 nm and 444-506 nm, respectively. Instrumental quantitation limits were 20-100 pg of mass injected. Of the 11 FQs investigated, seven (i.e., ciprofloxacin, difloxacin, enrofloxacin, fleroxacin, norfloxacin, moxifloxacin, and ofloxacin) were detected during a four-month sampling campaign of wastewater and wastewater-impacted surface water. Concentrations of FQs in raw wastewater, wastewater effluent, and wastewater-impacted surface water were 5-1292, 2-504, and 4-187ng/L, respectively.
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Affiliation(s)
- Ke He
- University of Maryland Baltimore County, Department of Chemical, Biochemical and Environmental Engineering, 1000 Hilltop Circle, Engineering 314, Baltimore, MD 21250, United States
| | - Lee Blaney
- University of Maryland Baltimore County, Department of Chemical, Biochemical and Environmental Engineering, 1000 Hilltop Circle, Engineering 314, Baltimore, MD 21250, United States.
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