engleski

Determination of clenbuterol residues in retinal tissue of food-producing pigs

The aim of the present study was to assess 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 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 since previous method validation yielded mean recovery values of 59.8%-86.1% with variation coefficients <15%. The mean (±SD) retinal clenbuterol concentration was 1223±157 ng/g immediately upon clenbuterol withdrawal (day 0) and 44±8 ng/g on the last day post-withdrawal (day 45), which significantly (p<0.05) exceeded the concentration measured in control animals. 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.

β2-adrenergic agonists; clenbuterol residues; retina; pigs; ELISA

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