کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2028783 1542733 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elimination kinetics of dexamethasone in bovine urine, hair and feces following single administration of dexamethasone acetate and phosphate esters
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Elimination kinetics of dexamethasone in bovine urine, hair and feces following single administration of dexamethasone acetate and phosphate esters
چکیده انگلیسی

Corticosteroids are hormonal substances widely used in human and veterinary medicine for their anti-inflammatory properties. Among the numerous existing artificial corticosteroids, dexamethasone remains the most commonly used, mainly throughout esterified forms such as acetate or phosphate. An experimental study was designed to assess its drug residue levels in urine and feces, as well as its fixation in bovine hair following a single administration of 0.15 mg/kg b.w. dexamethasone acetate and 0.12 mg/kg b.w. dexamethasone sodium phosphate. Different analytical methods based on GC–MS or LC–MS/MS were used for measuring dexamethasone and its esterified forms, which were implemented in 3 different European laboratories in the field that collaborated for this study. The obtained results confirmed the high and rapid urinary excretion rate of dexamethasone, with a maximal concentration (267 μg/L) measured one day after administration and 98% elimination within 3 days. The concentrations obtained with the GC–NCI-MS procedure (using chemical oxidation as derivatization) were found significantly higher than the ones obtained with LC–ESI-MS/MS, indicating a possible contribution of dexamethasone phase I and/or II metabolites to the monitored signal. Fecal elimination was also found rapid (95% elimination within 3 days) with a maximum concentration level (28.5 μg/kg) observed one day after administration. Detectable levels of dexamethasone in hair appeared on day 2 (11.5 μg/kg), reached a maximum around one week, and could be identified until 22 days upon treatment, establishing the suitability of hair as a biological matrix for medium to long-term residue controls of dexamethasone.

Research highlights▶ Dexamethasone is excreted rapidly in urine and feces (<3 days). ▶ Phase I metabolites of dexamethasone account for a large fraction in urine. ▶ Phase II metabolites are very abundant in feces. ▶ Dexamethasone could be retrieved in cattle hair until 22 days after treatment. ▶ Dexamethasone is completely liberated from esterified forms before diffusion to hair.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Steroids - Volume 76, Issues 1–2, January 2011, Pages 111–117
نویسندگان
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