Person: Anadón Navarro, Arturo Ramón
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First Name
Arturo Ramón
Last Name
Anadón Navarro
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Veterinaria
Department
Farmacología y Toxicología
Area
Toxicología
Identifiers
4 results
Search Results
Now showing 1 - 4 of 4
Item Plasma and Tissue Depletion of Florfenicol and Florfenicol-amine in Chickens(Journal of Agricultural and Food Chemistry, 2008) Anadón Navarro, Arturo Ramón; Martínez Caballero, María Aranzazu; Martínez Caballero, Marta; Ares Lombán, Irma; Martínez Larrañaga, María Rosa; Ríos, Alba; Caballero, VirginiaChickens were used to investigate plasma disposition of florfenicol after single intravenous (i.v.) and oral dose (20 mg kg-1 body weight) and to study residue depletion of florfenicol and its major metabolite florfenicol-amine after multiple oral doses (40 mg kg-1 body weight, daily for 3 days). Plasma and tissue samples were analyzed using a high-performance liquid chromatography (HPLC) method. After i.v. and oral administration, plasma concentration-time curves were best described by a two-compartment open model. The mean [ +/- standard deviation (SD)] elimination half-life (t1/2beta) of florfenicol in plasma was 7.90 +/- 0.48 and 8.34 +/- 0.64 h after i.v. and oral administration, respectively. The maximum plasma concentration was 10.23 +/- 1.67 microg mL-1, and the interval from oral administration until maximal concentration was 0.63 +/- 0.07 h. Oral bioavailability was found to be 87 +/- 16%. Florfenicol was converted to florfenicol-amine. After multiple oral dose (40 mg kg-1 body weight, daily for 3 days), in kidney and liver, concentrations of florfenicol (119.34 +/- 31.81 and 817.34 +/- 91.65 microg kg-1, respectively) and florfenicol-amine (60.67 +/- 13.05 and 48.50 +/- 13.07 microg kg-1, respectively) persisted for 7 days. The prolonged presence of residues of florfenicol and florfenicol-amine in edible tissues can play an important role in human food safety, because the compounds could give rise to a possible health risk. A withdrawal time of 6 days was necessary to ensure that the residues of florfenicol were less than the maximal residue limits or tolerance established by the European Union.Item Oral bioavailability, tissue distribution and depletion of flumequine in the food producing animal, chicken for fattening(Food and Chemical Toxicology, 2008) Anadón Navarro, Arturo Ramón; Martínez Caballero, María Aranzazu; Martínez Caballero, Marta; De la Cruz, C; Diaz, M.J.; Martínez Larrañaga, María RosaChickens were used to investigate kinetic properties including metabolism of flumequine after single IV and oral dose, and to study tissue depletion of flumequine after multiple oral doses. Plasma and tissue (muscle, kidney, liver and skin plus fat) concentrations of flumequine and its metabolite 7-hydroxyflumequine were determined using a HPLC method. After IV and oral administration (single-dose of 12 mg flumequine/kg bw), plasma concentration-time curves were best described by a two-compartment open model. Elimination half-life and mean residence time of flumequine in plasma were 6.91 and 5.90 h, respectively, after IV administration and 10.32 and 8.95 h after oral administration. Maximum plasma concentration was 3.62 microg/ml and interval from oral administration until maximum concentration was 1.43 h. Oral bioavailability was found to be 57%. Flumequine was converted to 7-hydroxyflumequine. After oral administration (24 mg/kg bw every 24 h for 5 days), renal and hepatic concentrations of flumequine (18-25 microg/kg) persisted for 4 days; however, at that time, flumequine residues were not detected in skin plus fat and muscle tissues. Flumequine administered at a dosage of 24 mg/kg bw every 24h for 5 days, with a withdrawal time of 2d ays, resulted in flumequine concentrations in target tissues that were less than the European Union maximal residue limits.Item Toxicokinetics of glyphosate and its metabolite aminomethyl phosphonic acid in rats(Toxicology Letters, 2009) Anadón Navarro, Arturo Ramón; Martínez Larrañaga, María Rosa; Martínez Caballero, María Aranzazu; Castellano Santos, Víctor Jesús; Martínez Caballero, Marta; Martín, M.T.; Nozal, M.J.; Bernal, J.L.The toxicokinetics of glyphosate after single 100 mg kg−1 intravenous (i.v.) and 400 mg kg−1 oral doses were studied in rats. Serial blood samples were obtained after i.v. and oral administration. Plasma concentrations of glyphosate and its metabolite amiomethyl phosphonic acid (AMPA) were determined by HPLC method. After i.v. and oral administration, plasma concentration–time curves were best described by a two-compartment open model. For glyphosate, the elimination half-lives (T1/2β) from plasma were 9.99 h after i.v. and 14.38 h after oral administration. The total plasma clearance was not influenced by dose concentration or route and reached a value of 0.995 l h−1 kg−1. After i.v. administration, the apparent volume of distribution in the second compartment (V2) and volume of distribution at steady state (Vss) were 2.39 and 2.99 l kg−1, respectively, suggesting a considerable diffusion of the herbicide into tissues. After oral administration, glyphosate was partially and slowly absorbed with a Tmax of 5.16 h. The oral bioavailability of glyphosate was found to be 23.21%. Glyphosate was converted to AMPA. The metabolite AMPA represented 6.49% of the parent drug plasma concentrations. The maximum plasma concentrations of glyphosate and AMPA were 4.62 and 0.416 μg ml−1, respectively. The maximum plasma concentration of AMPA was achieved at 2.42 h. For AMPA, the elimination half-life (T1/2β) was 15.08 h after oral administration of glyphosate parent compound.Item Toxicokinetics of lambda-cyhalothrin in rats(Toxicology Letters, 2006) Anadón Navarro, Arturo Ramón; Martínez Caballero, Marta; Martínez Caballero, María Aranzazu; Diaz, M.J.; Martínez Larrañaga, María RosaThe toxicokinetics of lambda-cyhalothrin after single 20 mg kg(-1) oral and 3 mg kg(-1) intravenous doses were studied in rats. Serial blood samples were obtained after oral and intravenous administration. Liver, brain, spinal cord, sciatic nerve, vas deferens, anococcygeus and myenteric plexus tissue samples were also collected. Plasma, liver, hypothalamus, cerebellum, medulla oblongata, frontal cortex, striatum, hippocampus, midbrain, spinal cord, vas deferens, anococcygeus, myenteric plexus and sciatic nerve concentrations of lambda-cyhalothrin were determined by HPLC. The plasma and tissue concentration-time data for lambda-cyhalothrin were found to fit a two-compartment open model. For lambda-cyhalothrin, the elimination half-life (T1/2beta) and the mean residence time from plasma were 7.55 and 8.55 h after i.v. and 10.27 and 14.43 h after oral administration. The total plasma clearance was not influenced by dose concentration or route and reached a value of 0.060l h(-1)kg(-1). After i.v. administration, the apparent volume of distribution and at steady state were 0.68 and 0.53l kg(-1), suggesting a diffusion of the pyrethroid into tissue. After oral administration, lambda-cyhalothrin was extensively but slowly absorbed (Tmax, 2.69 h). The oral bioavailability was found to be 67.37%. Significant differences in the kinetic parameters between nervous tissues and plasma was observed. The maximum concentrations in hypothalamus (Cmax, 24.12 microg g(-1)) and myenteric plexus (Cmax, 25.12 microg g(-1)) were about 1.5 times higher than in plasma (Cmax, 15.65 microg ml(-1)) and 1.3 times higher than in liver (Cmax, 18.42 microg ml(-1)). Nervous tissue accumulation of lambda-cyhalothrin was also reflected by the area under the concentration curve ratios of tissue/plasma (liver). The T1/2beta for lambda-cyhalothrin was significantly greater for the nerve tissues, including neuromuscular fibres, (range 12-26 and 15-34 h, after i.v. and oral doses) than for plasma (7.55 and 10.27 h, respectively).