Comparison of different methods for iodothyronines extraction from animal tissues.

Abstract

Four different methods for thyroid hormones concentration in various tissues have been compared. The methods involve homogenization, extraction with 95% ethanol and assay of iodothyronines by a highly sensitive RIA. The method described by Chopra et al. has been selected and used for further estimations as the most reliable and convenient for a continuous laboratory work. The T4 levels (means +/- SE) found in the liver, kidney and skeletal muscle were 22.49 +/- 2.19, 14.89 +/- 1.56 and 8.33 +/- 1.73 ng per g wet tissue. The T3 contents were 8.53 +/- 1.08, 9.52 +/- 0.69 and 4.90 +/- 0.76 ng per g wet tissue, respectively.