Circulating thyroid hormones and associated metabolites in white whales (Delphinapterus leucas) determined using isotope-dilution mass spectrometry
2017
Abstract Blood was sampled from nine free-ranging white whales (beluga whale, Delphinapterus leucas ) from Svalbard, Norway during the summers of 2013 and 2014. Total concentrations of eleven thyroid hormones and metabolites were measured in serum using a novel liquid chromatography tandem mass spectrometry analytical method. Measurements of these compounds in plasma gave the same results as in serum. The three hormones found in highest concentrations were 3,3′,5-triiodothyronine (T 3 ), 3,3′,5′-triiodothyronine (rT 3 ) and thyroxine (T 4 ). Traces of associated metabolites were also found.
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