Quinolone

牛患肺炎、乳腺炎、关节炎等症状可由全球病原体牛支原体引起。在氟喹诺酮类药物测试组中，匈牙利菌株的抗生素敏感性特征是一致的。恩诺沙星抑制 3 个菌株（MYC44、MYC45 和 MYC46），其 MIC 值≥10 μg/mL，而其余菌株的 MIC ≤0.312 或 0.625 μg/mL[1]。

八十只小鼠经历六十分钟的短暂大脑中动脉闭塞（MCAo），然后再灌注。 MCAo 后，动物在诊断出肺部感染后随机接受治疗药物（n=25；恩诺沙星），或从 MCAo 当天开始每日预防药物（n=26；恩诺沙星）。通常在第 4 天至第 6 天之间出现临床症状（一般健康评分大于 6）后，立即开始标准治疗。与安慰剂治疗相比，使用恩诺沙星的预防性抗生素治疗和传统抗生素治疗均以类似的方式提高生存率[2]。

Mice [2]
Male C57Bl6/J mice aged 11–14 weeks are utilized. Over the course of seven days, animals treated with antibiotics receive a daily oral dose of 10 mg/kg body weight administered via feeding needle every 12 hours. Enrofloxacin (2.5% oral solution) is dispensed in saline (2 mg/mL). In contrast, animals receiving a placebo receive the same amount of saline via feeding needle. After emerging from reperfusion anesthesia, the animals in the preventive antibiotic group were given Enrofloxacin (about an hour after the procedure). Therapeutic antibiotic treatment is started as soon as clinical symptoms (general health score >5) appear and an MRI confirms the lung infection (signal rate ≥5%). Allocation to groups is done at random[2].

Absorption, Distribution and Excretion
Pharmacokinetics and bioavailability of enrofloxacin were determined after single intravenous (IV) and intramuscular (IM) administrations of 5 mg/kg body weight (BW) to 5 healthy adult Angora goats. Plasma enrofloxacin concentrations were measured by high performance liquid chromatography. Pharmacokinetics were best described by a 2-compartment open model. The elimination half-life and volume of distribution after IV and IM administrations were similar (t1/2beta, 4.0 to 4.7 hr and Vd(ss),1.2 to 1.5 L/kg, respectively). Enrofloxacin was rapidly (t1/2a, 0.25 hr) and almost completely absorbed (F, 90%) after IM administration. Mean plasma concentrations of enrofloxacin at 24 hr after IV and IM administration (0.07 and 0.09 microg/mL, respectively) were higher than the minimal inhibitory concentration (MIC) values for most pathogens. In conclusion, once-daily IV and IM administration of enrofloxacin (5 mg/kg BW) in Angora goats may be useful in treatment of infectious diseases caused by sensitive pathogens.
Plasma, urine, and skin drug concentrations were determined for dogs (n=12) given five daily oral doses of marbofloxacin (MAR) (2.75 mg/kg), enrofloxacin (ENR) (5.0 mg/kg) or difloxacin (DIF) (5.0 mg/kg). Concentrations of the active metabolite of ENR, ciprofloxacin (CIP), were also determined. The three-period, three-treatment crossover experimental design included a 21-day washout period between treatments. Area under the plasma drug concentration vs. time curve (AUC0-last, microg/mlxhr of MAR was greater than for ENR, CIP, ENR/CIP combined, and DIF. Maximum concentration (Cmax) of MAR was greater than ENR, CIP, and DIF. Time of maximum plasma concentration (Tmax) was similar for MAR and DIF; Tmax occurred earlier for ENR and later for CIP. Plasma half-life (t1/2) of MAR was longer than for ENR, CIP, and DIF. Urine concentrations of DIF were less than MAR or ENR/CIP combined, but urine concentrations of MAR and ENR/CIP combined did not differ. DIF skin concentrations were less than the concentrations of MAR or ENR/CIP combined 2 h after dosing, but skin concentrations of MAR and ENR/CIP combined did not differ.
Serum concentrations and pharmacokinetics of enrofloxacin were studied in 6 mares after intravenous (IV) and intragastric (IG) administration at a single dose rate of 7.5 mg/kg body weight. In experiment 1, an injectable formulation of enrofloxacin (100 mg/ml) was given IV. At 5 min after injection, mean serum concentration was 9.04 microg/mL and decreased to 0.09 microg/mL by 24 hr. Elimination half-life was 5.33 +/- 1.05 hr and the area under the serum concentration vs time curve (AUC) was 21.03 +/- 5.19 mg x hr/L. In experiment 2, the same injectable formulation was given IG. The mean peak serum concentration was 0.94 +/- 0.97 microg/ml at 4 hr after administration and declined to 0.29 +/- 0.12 microg/ml by 24 hr. Absorption of this enrofloxacin preparation after IG administration was highly variable, and for this reason, pharmacokinetic values for each mare could not be determined. In experiment 3, a poultry formulation (32.3 mg/ml) was given IG. The mean peak serum concentration was 1.85 +/- 1.47 microg/ml at 45 min after administration and declined to 0.19 +/- 0.06 microg/mL by 24 h. Elimination half-life was 10.62 +/- 5.33 h and AUC was 16.30 +/- 4.69 mg x h/L. Bioavailability was calculated at 78.29 +/- 16.55%. Minimum inhibitory concentrations of enrofloxacin were determined for equine bacterial culture specimens submitted to the microbiology laboratory over an 11-month period. The minimum inhibitory concentration of enrofloxacin required to inhibit 90% of isolates (MIC90) was 0.25 microg/ml for Staphylococcus aureus, Escherichia coli, Salmonella spp., Klebsiella spp., and Pasteurella spp. The poultry formulation was well tolerated and could be potentially useful in the treatment of susceptible bacterial infections in adult horses. The injectable enrofloxacin solution should not be used orally.
Concentrations of enrofloxacin equivalent activity were determined by microbiological assay in the plasma of healthy and E. coli-infected broilers following single intravenous and oral administrations at 10 mg/kg. Tissue distribution and residue-depletion following multiple oral doses (10 mg/kg for 3 successive days) were investigated. Pharmacokinetic variables were determined using compartmental and non-compartmental analytical methods. Plasma enrofloxacin concentrations after intravenous dosing to healthy and infected birds were best described by a two-compartments model. Enrofloxacin concentrations in plasma of infected birds were lower than those of healthy ones. The disposition kinetics of intravenously administered drug in healthy and infected birds were somewhat different. The elimination half-life (t1/2 beta) was 4.75 vs. 3.63 hr; mean residence time (MRT) was 6.72 vs 4.90 hr; apparent volume of the central compartment (Vc) was 1.11 vs 1.57 l/kg; rate constant for transfer from peripheral to central compartment (k21) was 1.15 vs 1.41 hr-1 and total body clearance (ClB) was 0.35 vs 0.53 l/hr/kg in healthy and infected birds, respectively. After oral administration, the absorption half-life (t1/2abs) in the infected birds was significantly longer than in healthy birds, while elimination half-life (t1/2el) and MRT were significantly shorter. Bioavailability was higher in infected birds (72.50%) as compared to healthy ones (69.78%). Enrofloxacin was detected in the tissues of healthy and infected birds after daily oral dosing of 10 mg/kg for 3 days. It was more concentrated in liver, kidney, and breast muscle. The minimal inhibitory concentration (MIC) of enrofloxacin against E. coli was 0.064 microgram/ml. On the basis of maintaining enrofloxacin plasma concentrations over the MIC, a dose of 10 mg/kg given intravenously every 20.14 hr or orally every 20.86 hr should provide tissue concentrations effective against E. coli infection in chickens.
For more Absorption, Distribution and Excretion (Complete) data for ENROFLOXACIN (6 total), please visit the HSDB record page.

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Metabolism / Metabolites
The pharmacokinetics of enrofloxacin and its active metabolite ciprofloxacin were investigated in goats after a single intramuscular administration of enrofloxacin at 2.5 mg/kg body weight. The plasma concentrations of enrofloxacin and ciprofloxacin were determined simultaneously by a HPLC method. The peak concentrations (Cmax) of enrofloxacin (1.13 microg/ml) and ciprofloxacin (0.24 microg/ml) were observed at 0.8 and 1.2 hr, respectively. The elimination half-life (t1/2beta), volume of distribution (Vd(area)), total body clearance (Cl(B)) and mean residence time (MRT) of enrofloxacin were 0.74 hr, 1.42 l/kg, 1329 ml/hr per kg and 1.54 hr, respectively. The t1/2beta, area under the plasma concentration-time curve (AUC) and the MRT of ciprofloxacin were 1.38 h, 0.74 microg h/ml and 2.73 h, respectively. The metabolic conversion of enrofloxacin to ciprofloxacin was appreciable (36%) and the sum of the plasma concentrations of enrofloxacin and ciprofloxacin was maintained at or above 0.1 microg/ml for up to 4 hr. Enrofloxacin appears to be useful for the treatment of goat diseases associated with pathogens sensitive to this drug.

Interactions
The objective of the study was to determine the in vitro interaction between enrofloxacin and ciprofloxacin against Escherichia coli and staphylococcal isolates from dogs. The microdilution checkerboard assay was used to determine the interaction of the drugs against 50 E. coli and 50 beta-haemolytic staphylococcal clinical isolates. The checkerboard assay revealed that the activity of enrofloxacin and ciprofloxacin was additive against E. coli and staphylococcal clinical isolates. It was concluded that for bacterial species against which ciprofloxacin is more potent than enrofloxacin, the in vivo transformation of enrofloxacin to ciprofloxacin may enhance the efficacy of enrofloxacin, if additivity of the drugs is confirmed in vivo.

[1]. Antibiotic susceptibility profiles of Mycoplasma bovis strains isolated from cattle in Hungary, Central Europe. BMC Vet Res. 2014 Oct 25;10:256.

[2]. Superiority of preventive antibiotic treatment compared with standard treatment of poststroke pneumonia in experimental stroke: a bed to bench approach. J Cereb Blood Flow Metab. 2013 Jun;33(6):846-54.

[3]. Antiviral activity and inhibition of topoisomerase by ofloxacin, a new quinolone derivative. Antiviral Res. 1987 Oct;8(3):103-13.

Enrofloxacin is a quinolinemonocarboxylic acid that is 1,4-dihydroquinoline-3-carboxylic acid substituted by an oxo group at position 4, a fluoro group at position 6, a cyclopropyl group at position 1 and a 4-ethylpiperazin-1-yl group at position 7. It is a veterinary antibacterial agent used for the treatment of pets. It has a role as an antibacterial agent, an antineoplastic agent and an antimicrobial agent. It is a quinolinemonocarboxylic acid, a quinolone, an organofluorine compound, a N-alkylpiperazine, a N-arylpiperazine and a member of cyclopropanes.
Enrofloxacin is an antibiotic agent from the fluoroquinolone family produced by the Bayer Corporation. Enrofloxacin is approved by the FDA for its veterinary use. Due to the identification of fluoroquinolone-resistant strains of Campylobacter, in September 2005, the FDA withdrew the approval of enrofloxacin for its use in water to treat flocks of poultry.
A fluoroquinolone antibacterial and antimycoplasma agent that is used in veterinary practice.
See also: Enrofloxacin; Silver sulfadiazine (component of).

C19H22FN3O3

359.3947

359.164

C, 63.50; H, 6.17; F, 5.29; N, 11.69; O, 13.36

93106-60-6

Enrofloxacin monohydrochloride;93106-59-3;Enrofloxacin-d5;1173021-92-5

71188

Light yellow to yellow solid powder

1.4±0.1 g/cm3

560.5±50.0 °C at 760 mmHg

225 °C

292.8±30.1 °C

0.0±1.6 mmHg at 25°C

1.634

1.88

65.78

1

7

4

26

613

0

O=C(C1C(=O)C2C(=CC(N3CCN(CC)CC3)=C(C=2)F)N(C2CC2)C=1)O

SPFYMRJSYKOXGV-UHFFFAOYSA-N

InChI=1S/C19H22FN3O3/c1-2-21-5-7-22(8-6-21)17-10-16-13(9-15(17)20)18(24)14(19(25)26)11-23(16)12-3-4-12/h9-12H,2-8H2,1H3,(H,25,26)

3-Quinolinecarboxylic acid, 1,4-dihydro-1-cyclopropyl-7-(4-ethyl-1-piperazinyl)-6-fluoro-4-oxo-, hydrochloride

Baytril; Enrofloxacine; CFPQ; Bay-Vp-2674; BAY-Vp2674; PD 160788; BAY-Vp2674; PD160788; BAY-Vp 2674; PD-160788; endrofloxicin.

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

4-Methylpyridine : ~30 mg/mL
H2O : ~1 mg/mL (~2.78 mM)
DMSO : 1~10 mg/mL ( 2.78~27.82 mM )

配方 1 中的溶解度: ≥ 1 mg/mL (2.78 mM) (饱和度未知) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (这些助溶剂从左到右依次添加，逐一添加), 澄清溶液。
例如，若需制备1 mL的工作液，可将100 μL 10.0 mg/mL澄清DMSO储备液加入400 μL PEG300中，混匀；然后向上述溶液中加入50 μL Tween-80，混匀；加入450 μL生理盐水定容至1 mL。
*生理盐水的制备：将 0.9 g 氯化钠溶解在 100 mL ddH₂O中，得到澄清溶液。

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配方 2 中的溶解度: ≥ 1 mg/mL (2.78 mM) (饱和度未知) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (这些助溶剂从左到右依次添加，逐一添加), 澄清溶液。
例如，若需制备1 mL的工作液，可将 100 μL 10.0 mg/mL澄清DMSO储备液加入900 μL 20% SBE-β-CD生理盐水溶液中，混匀。
*20% SBE-β-CD 生理盐水溶液的制备（4°C，1 周）：将 2 g SBE-β-CD 溶解于 10 mL 生理盐水中，得到澄清溶液。

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配方 3 中的溶解度: ≥ 1 mg/mL (2.78 mM) (饱和度未知) in 10% DMSO + 90% Corn Oil (这些助溶剂从左到右依次添加，逐一添加), 澄清溶液。
例如，若需制备1 mL的工作液，可将 100 μL 10.0 mg/mL 澄清 DMSO 储备液加入900 μL 玉米油中，混合均匀。

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配方 4 中的溶解度: 10% DMSO+40% PEG300+5% Tween-80+45% Saline: ≥ 1 mg/mL (2.78 mM)

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请根据您的实验动物和给药方式选择适当的溶解配方/方案：
1、请先配制澄清的储备液(如：用DMSO配置50 或 100 mg/mL母液(储备液));
2、取适量母液，按从左到右的顺序依次添加助溶剂，澄清后再加入下一助溶剂。以 下列配方为例说明 (注意此配方只用于说明，并不一定代表此产品 的实际溶解配方):
10% DMSO → 40% PEG300 → 5% Tween-80 → 45% ddH2O (或 saline);
假设最终工作液的体积为 1 mL, 浓度为5 mg/mL: 取 100 μL 50 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀/澄清；向上述体系中加入50 μL Tween-80，混合均匀/澄清；然后继续加入450 μL ddH2O (或 saline)定容至 1 mL；
3、溶剂前显示的百分比是指该溶剂在最终溶液/工作液中的体积所占比例;
4、 如产品在配制过程中出现沉淀/析出，可通过加热(≤50℃)或超声的方式助溶;
5、为保证最佳实验结果，工作液请现配现用！
6、如不确定怎么将母液配置成体内动物实验的工作液，请查看说明书或联系我们;
7、 以上所有助溶剂都可在 Invivochem.cn网站购买。