Journal Article

Determination of Clenbuterol Residues in Retinal Tissue of Food-Producing Pigs

Jelka Pleadin, Ana Vulić, Mario Mitak, Nina Perši and Dinka Milić

in Journal of Analytical Toxicology

Volume 35, issue 1, pages 28-31
Published in print January 2011 | ISSN: 0146-4760
Published online January 2011 | e-ISSN: 1945-2403 | DOI:
Determination of Clenbuterol Residues in Retinal Tissue of Food-Producing Pigs

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The aim of the present study was to assess the persistence of clenbuterol residues in retinal tissue of pigs after repeated administration in a growth-promoting dose, using enzyme-linked immunosorbent assay (ELISA) as a screening method for quantitative determination. A growth-promoting dose of clenbuterol (20 µg/kg body mass per day) was administered orally to the experimental group (n = 6) for 21 days, whereas control animals (n = 3) were left untreated. Clenbuterol-treated pigs were randomly sacrificed (n = 3) on days 0 and 45 of treatment discontinuation, and clenbuterol residues were determined in retinal tissue dissected from the eye. ELISA was found to be acceptable for quantitative determination of clenbuterol in retinal samples because previous method validation yielded mean recovery values of 84.3–96.5% with variation coefficients < 14%. The mean (± SD) retinal clenbuterol concentration was 1874 ± 114 ng/g immediately upon clenbuterol withdrawal (day 0) and 73 ± 4 ng/g on the last day post-withdrawal (day 45). Study results pointed to a very high potential of clenbuterol accumulation in retinal tissue and marked persistence of clenbuterol residues upon anabolic dose administration, suggesting retinal tissue to be a very useful matrix for effective control of residual clenbuterol in food-producing pigs.

Journal Article.  0 words. 

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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