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Durna Corum D, Corum O, Terzi E, Coskun D, Bilen S, Cetin G, Uney K. Pharmacokinetics of cefquinome in rainbow trout (Oncorhynchus mykiss) after intravascular, intraperitoneal, and oral administrations. J Vet Pharmacol Ther 2022; 45:578-583. [PMID: 36000461 DOI: 10.1111/jvp.13091] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/04/2022] [Accepted: 08/12/2022] [Indexed: 11/28/2022]
Abstract
This study aimed to determine the pharmacokinetics and bioavailability of cefquinome in rainbow trout (Oncorhynchus mykiss) following intravascular (IV), intraperitoneal (IP), and oral (PO) administrations at 14 ± 1°C. In this study, three hundred and six clinically healthy rainbow trout (110-140 g) were used. The fish received single IV, IP, and PO injections of cefquinome at 10 mg/kg dose. The plasma concentrations of cefquinome were measured using HPLC-UV and were evaluated using non-compartmental analysis. Cefquinome was measured up to 96 h for PO route and 144 h for IV and IP routes in plasma. Following IV administration, t1/2ʎz , ClT , and Vdss were 18.85 h, 0.037 L/h/kg, and 0.84 L/kg, respectively. The Cmax of IP and PO routes was 9.75 and 1.64 μg/ml, respectively. The bioavailability following IP and PO administrations was 59.46% and 12.33%, respectively. Cefquinome at 10 mg/kg dose may maintain T > MIC above 40% at 72 and 96 h intervals, respectively, following the IP and IV routes for bacteria with MIC values of ≤2 μg/ml and at 24 h intervals following the PO route for bacteria with MIC value of ≤0.75 μg/ml. However, further studies are needed to determine in vitro and in vivo antibacterial efficacy and multiple dosage regimens of cefquinome against pathogens isolated from rainbow trout.
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Affiliation(s)
- Duygu Durna Corum
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Hatay Mustafa Kemal, Hatay, Turkiye
| | - Orhan Corum
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Hatay Mustafa Kemal, Hatay, Turkiye
| | - Ertugrul Terzi
- Faculty of Fisheries, University of Kastamonu, Kastamonu, Turkiye
| | - Devran Coskun
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Siirt, Siirt, Turkiye
| | - Soner Bilen
- Faculty of Fisheries, University of Kastamonu, Kastamonu, Turkiye
| | - Gul Cetin
- Department of Pharmacology, Faculty of Pharmacy, University of Erzincan Binali Yıldırım, Erzincan, Turkiye
| | - Kamil Uney
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Selcuk, Konya, Turkiye
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El-Tahawy AO, Said AA, Shams GA, Hassan HM, Hassan AM, Amer SA, El-Nabtity SM. Evaluation of cefquinome's efficacy in controlling avian colibacillosis and detection of its residues using High performance liquid chromatography (HPLC). Saudi J Biol Sci 2022; 29:3502-3510. [PMID: 35844377 PMCID: PMC9280232 DOI: 10.1016/j.sjbs.2022.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 02/03/2022] [Accepted: 02/20/2022] [Indexed: 11/01/2022] Open
Abstract
This study aimed to evaluate the efficacy of cefquinome in treatment and controlling of Escherichia coli experimentally infected broiler chickens, in addition of detection of its residues using High performance liquid chromatography (HPLC). In this study, 150 one-day old Cobb broiler chicks were used. On the 14th day chicks experimentally infected and divided into 3 equal groups (50 each); control group (G1) non-infected, non-treated, (G2) infected with E. coli O78 non treated, (G3) infected with E. coli O78, cefquinome treated. Cefquinome was administrated 5th day post infection, intramuscularly by a dose of (2 mg/ kg b w.t) for 3 consecutive days. Experimental E. coli infection in broilers induced weakness, loss of appetite, depression, cough and watery diarrhea in addition to a recorded mortality (30%) with reduction in growth performance, erythrogram, total proteins, albumin, antioxidants and haemagglutination inhibition (HI) titers. In addition, a significant increase in feed conversion rate (FCR), leukocytic count, liver enzymes, kidney functions, total globulins, malondialdehyde, nitric oxide and lysozyme activity. Treatment with cefquinome led to decreased mortality rate, improvement in clinical signs, growth performance and modulated most of these altered parameters. Cefquinome's residues was not detected in breast muscles 3rd day and liver and kidneys 7th days post treatment. Therefore, it's recommended that cefquinome is a good choice for controlling of colibacillosis in broilers and its withdrawal time 3 days in breast muscles and 7 days in liver and kidney post treatment.
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Elbadawy M, Soliman A, Abugomaa A, Alkhedaide A, Soliman MM, Aboubakr M. Disposition of Cefquinome in Turkeys ( Meleagris gallopavo) Following Intravenous and Intramuscular Administration. Pharmaceutics 2021; 13:pharmaceutics13111804. [PMID: 34834219 PMCID: PMC8622898 DOI: 10.3390/pharmaceutics13111804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/21/2021] [Accepted: 10/24/2021] [Indexed: 12/15/2022] Open
Abstract
The bioavailability and pharmacokinetics in turkeys of cefquinome (CFQ), a broad-spectrum 4th-generation cephalosporin antibiotic, were explored after a single injection of 2 mg/kg body weight by intravenous (IV) and intramuscular (IM) routes. In a crossover design and 3-weeks washout interval, seven turkeys were assigned for this objective. Blood samples were collected prior to and at various time intervals following each administration. The concentration of CFQ in plasma was measured using HPLC with a UV detector set at 266 nm. For pharmacokinetic analysis, non-compartmental methods have been applied. Following IV administration, the elimination half-life (t1/2ʎz), distribution volume at steady state (Vdss), and total body clearance (Cltot) of CFQ were 1.55 h, 0.54 L/kg, and 0.32 L/h/kg, respectively. Following the IM administration, CFQ was speedily absorbed with an absorption half-life (t1/2ab) of 0.25 h, a maximum plasma concentration (Cmax) of 2.71 μg/mL, attained (Tmax) at 0.56 h. The bioavailability (F) and in vitro plasma protein binding of CFQ were 95.56% and 11.5%, respectively. Results indicated that CFQ was speedily absorbed with a considerable bioavailability after IM administration. In conclusion, CFQ has a favorable disposition in turkeys that can guide to estimate optimum dosage regimes and eventually lead to its usage to eradicate turkey's susceptible bacterial infections.
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Affiliation(s)
- Mohamed Elbadawy
- Department of Pharmacology, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh 13736, Qalioubiya, Egypt;
- Correspondence: (M.E.); (A.A.); Tel.: +81-90-2076-8122 (M.E.); +81-90-1238-1298 (A.A.)
| | - Ahmed Soliman
- Pharmacology Department, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt;
| | - Amira Abugomaa
- Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Dakahliya, Egypt
- Correspondence: (M.E.); (A.A.); Tel.: +81-90-2076-8122 (M.E.); +81-90-1238-1298 (A.A.)
| | - Adel Alkhedaide
- Clinical Laboratory Sciences Department, Turabah University College, Taif University, Taif 21995, Saudi Arabia; (A.A.); (M.M.S.)
| | - Mohamed Mohamed Soliman
- Clinical Laboratory Sciences Department, Turabah University College, Taif University, Taif 21995, Saudi Arabia; (A.A.); (M.M.S.)
| | - Mohamed Aboubakr
- Department of Pharmacology, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh 13736, Qalioubiya, Egypt;
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Shan Q, Wang J, Yang F, Ma L, Yin Y, Liu S, Li L, Zheng G. Pharmacokinetics of cefquinome in crucian carp (Carassius auratus gibelio) after oral, intramuscular, intraperitoneal, and bath administration. J Vet Pharmacol Ther 2018; 41:734-738. [PMID: 29654606 DOI: 10.1111/jvp.12510] [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] [Received: 11/28/2017] [Accepted: 02/05/2018] [Indexed: 11/29/2022]
Abstract
The pharmacokinetics (PK) of cefquinome (CEQ) was studied in crucian carp (Carassius auratus gibelio) after single oral, intramuscular (i.m.), and intraperitoneal (i.p.) administration at a dose of 10 mg/kg body weight and following incubation in a 5 mg/L bath for 5 hr at 25°C. The plasma concentration of CEQ was determined using high-performance liquid chromatography (HPLC). PK parameters were calculated based on mean CEQ concentration using WinNonlin 6.1 software. The disposition of CEQ following oral, i.m., or i.p. administration was best described by a two-compartment open model with first-order absorption. After oral, i.m., and i.p. administration, the maximum plasma concentration (Cmax ) values were 1.52, 40.53, and 67.87 μg/ml obtained at 0.25, 0.23, and 0.35 hr, respectively, while the elimination half-life (T1/2β ) values were 4.68, 7.39, and 6.88 hr, respectively; the area under the concentration-time curve (AUC) values were 8.61, 339.11, and 495.06 μg hr/ml, respectively. No CEQ was detected in the plasma after bath incubation. Therapeutic blood concentrations of CEQ can be achieved in the crucian carp following i.m. and i.p. administration at a dosage of 10 mg/kg once every 2 days.
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Affiliation(s)
- Q Shan
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - J Wang
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangdong Laboratory Animals Monitoring Institute, Guangzhou, China
| | - F Yang
- Guangdong Provincial Key Laboratory of Laboratory Animals, Guangdong Laboratory Animals Monitoring Institute, Guangzhou, China
| | - L Ma
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - Y Yin
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - S Liu
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - L Li
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - G Zheng
- Key Laboratory of Recreational Fisheries Research, Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality and Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
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Uney K, Altan F, Cetin G, Aboubakr M, Dik B, Sayın Z, Er A, Elmas M. Pharmacokinetics of cefquinome in red-eared slider turtles (Trachemys scripta elegans) after single intravenous and intramuscular injections. J Vet Pharmacol Ther 2017; 41:e40-e44. [DOI: 10.1111/jvp.12448] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 07/14/2017] [Indexed: 12/15/2022]
Affiliation(s)
- K. Uney
- Department of Pharmacology and Toxicology; Faculty of Veterinary Medicine; University of Selcuk; Konya Turkey
| | - F. Altan
- Department of Pharmacology and Toxicology; Faculty of Veterinary Medicine; University of Dicle; Diyarbakır Turkey
| | - G. Cetin
- Department of Biochemistry; Faculty of Pharmacy; University of Erzincan; Erzincan Turkey
| | - M. Aboubakr
- Department of Pharmacology; Faculty of Veterinary Medicine; Benha University; Moshtohor Egypt
| | - B. Dik
- Department of Pharmacology and Toxicology; Faculty of Veterinary Medicine; University of Selcuk; Konya Turkey
| | - Z. Sayın
- Department of Microbiology; Faculty of Veterinary Medicine; University of Selcuk; Konya Turkey
| | - A. Er
- Department of Pharmacology and Toxicology; Faculty of Veterinary Medicine; University of Selcuk; Konya Turkey
| | - M. Elmas
- Department of Pharmacology and Toxicology; Faculty of Veterinary Medicine; University of Selcuk; Konya Turkey
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El Badawy S, Amer A, Kamel G, Eldeib K, Constable P. Comparative pharmacokinetics using a microbiological assay and high performance liquid chromatography following intravenous administration of cefquinome in lactating goats with and without experimentally induced Staphylococcus aureus mastitis. Small Rumin Res 2015. [DOI: 10.1016/j.smallrumres.2015.11.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shan Q, Zhu X, Liu S, Bai Y, Ma L, Yin Y, Zheng G. Pharmacokinetics of cefquinome in tilapia (Oreochromis niloticus) after a single intramuscular or intraperitoneal administration. J Vet Pharmacol Ther 2015; 38:601-5. [PMID: 25707428 DOI: 10.1111/jvp.12219] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 02/04/2015] [Indexed: 11/28/2022]
Abstract
The pharmacokinetics of cefquinome was studied in plasma after a single dose (10 mg/kg) of intramuscular (i.m.) or intraperitoneal (i.p.) administration to tilapia (Oreochromis niloticus) in freshwater at 30 °C. Ten fish per sampling point were examined after treatment. The data were fitted to two-compartment open models following both routes of administration. The estimates of total body clearance (CL/F), volume of distribution (Vd/F), and absorption half-life (T1/2ka ) were 0.049 and 0.037 L/h/kg, 0.41 and 0.33 L/kg, and 0.028 and 0.035 h following i.m. and i.p. administration, respectively. After i.m. injection, the elimination half-life (T1⁄2β ) was calculated to be 5.81 h, the maximum plasma concentration (Cmax ) to be 49.40 μg/mL, the time to peak plasma cefquinome concentration (Tmax ) to be 0.14 h, and the area under the plasma concentration-time curve (AUC) to be 204.6 μg h/mL. Following i.p. administration, the corresponding estimates were 6.05 h, 44.39 μg/mL, 0.17 h and 267.8 μg h/mL. The minimum inhibitory concentrations of cefquinome, determined for 30 strains of Streptococcus agalactiae isolated from diseased tilapia, ranged from 0.015 to 0.12 μg/mL. Results from these studies support that 10 mg cefquinome/kg body weight daily could be expected to control tilapia bacterial pathogens inhibited in vitro by a minimal inhibitory concentration value of ≤2 μg/mL.
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Affiliation(s)
- Q Shan
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - X Zhu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - S Liu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - Y Bai
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - L Ma
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - Y Yin
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
| | - G Zheng
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation of Ministry of Agriculture and Ministry of Agriculture Laboratory of Quality & Safety Risky Assessment for Aquatic Product, Pearl River Fisheries Research Institute, Chinese Academic of Fishery Science, Guangzhou, China
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Comparative Pharmacokinetics of Cefquinome (Cobactan 2.5%) following Repeated Intramuscular Administrations in Sheep and Goats. J Vet Med 2014; 2014:949642. [PMID: 26464946 PMCID: PMC4590874 DOI: 10.1155/2014/949642] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 04/13/2014] [Accepted: 04/27/2014] [Indexed: 11/17/2022] Open
Abstract
The comparative pharmacokinetic profile of cefquinome was studied in sheep and goats following repeated intramuscular (IM) administrations of 2 mg/kg body weight. Cefquinome concentrations in serum were determined by microbiological assay technique using Micrococcus luteus (ATCC 9341) as test organism. Following intramuscular injection of cefquinome in sheep and goats, the disposition curves were best described by two-compartment open model in both sheep and goats. The pharmacokinetics of cefquinome did not differ significantly between sheep and goats; similar intramuscular dose rate of cefquinome should therefore be applicable to both species. On comparing the data of serum levels of repeated intramuscular injections with first intramuscular injection, it was revealed that repeated intramuscular injections of cefquinome have cumulative effect in both species sheep and goats. The in vitro serum protein-binding tendency was 15.65% in sheep and 14.42% in goats. The serum concentrations of cefquinome along 24 h after injection in this study were exceeding the MICs of different susceptible microorganisms responsible for serious disease problems. These findings indicate successful use of cefquinome in sheep and goats.
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Shan Q, Yang F, Wang J, Ding H, He L, Zeng Z. Pharmacokinetic/pharmacodynamic relationship of cefquinome against Pasteurella multocida in a tissue-cage model in yellow cattle. J Vet Pharmacol Ther 2013; 37:178-85. [PMID: 23980645 DOI: 10.1111/jvp.12076] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 07/15/2013] [Indexed: 11/29/2022]
Abstract
The cephalosporin antimicrobial drug cefquinome was administered to yellow cattle intravenously (i.v.) and intramuscularly (i.m.) at a dose of 1 mg/kg of body weight in a two-period crossover study. The pharmacokinetic (PK) properties of cefquinome in serum, inflamed tissue-cage fluid (exudate), and noninflamed tissue-cage fluid (transudate) were studied using a tissue-cage model. The in vitro and ex vivo activities of cefquinome in serum, exudate, and transudate against a pathogenic strain of Pasteurella multocida (P. multocida) were determined. A concentration-independent antimicrobial activity of cefquinome was confirmed for levels lower than 4 × MIC. Integration of in vivo pharmacokinetic data with the in vitro MIC provided mean values for the time that drug levels remain above the MIC (T > MIC) in serum was 14.10 h after intravenous and 14.46 h after intramuscular dosing, indicating a likely high level of effectiveness in clinical infections caused by P. multocida of MIC 0.04 μg/mL or less. These data may be used as a rational basis for setting dosing schedules, which optimize clinical efficacy and minimize the opportunities for emergence of resistant organisms.
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Affiliation(s)
- Q Shan
- National Reference Laboratory of Veterinary Drug Residues (SCAU), College of Veterinary Medicine, South China Agricultural University, Guangzhou, China; Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, China
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Liu B, Zhang C, Zhang X, Yang S, Yu J, Sun J, Liu Y. Pharmacokinetics and bioavailability of cefquinome in crossbred wild boars. J Vet Pharmacol Ther 2012; 35:611-4. [PMID: 22221167 DOI: 10.1111/j.1365-2885.2011.01360.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- B Liu
- College of Veterinary Medicine, National Reference Laboratory of Veterinary Drug Residues (SCAU), South China Agricultural University, Guangzhou, China
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Yuan L, Sun J, Wang R, Sun L, Zhu L, Luo X, Fang B, Liu Y. Pharmacokinetics and bioavailability of cefquinome in healthy ducks. Am J Vet Res 2011; 72:122-6. [DOI: 10.2460/ajvr.72.1.122] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zhang X, Li J, Jiang H, Shen J. Residue depletion of cefquinome in swine tissues after intramuscular administration. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:10493-10498. [PMID: 18020410 DOI: 10.1021/jf0719860] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A high-performance liquid chromatography (HPLC) method with ultraviolet (UV) detection was developed for the detection of cefquinome (CEQ) residues in swine tissues. The limit of detection (LOD) of the method was 5 ng g(-1) for muscle and 10 ng g(-1) for fat, liver, and kidney. Mean recoveries of CEQ in all fortified samples at a concentration range of 20-500 ng g(-1) were 80.5-86.0% with coefficient of variation (CV) below 10.3%. Residue depletion study of CEQ in swine was conducted after five intramuscular injections at a dose of 2 mg kg(-1) of body weight with 24 h intervals. CEQ residue concentrations were detected in muscle, fat, liver, and kidney using the HPLC-UV method at 265 nm. The highest CEQ concentration was measured in kidney tissue during the study period, indicating that kidney was the target tissue for CEQ. CEQ concentrations in all examined tissues were below the accepted maximum residue limit (MRL) recommended by the Committee for Veterinary Medical Products of European Medical Evaluation Agency (EMEA) at 3 days post-treatment.
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Affiliation(s)
- Xiaoguang Zhang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing 100094, People's Republic of China
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