The mass spectral properties of four classes of derivatives of thyronine are discussed
(oxazolidinone, O‐methyl oxazolidinone, O‐acetyl oxazolidinone and N, O …

We describe a highly accurate and specific method based on isotope dilution--mass
spectrometry for assay of thyroxin in serum. A fixed amount of 2H2-labeled thyroxin is added …

The mass spectra of the trimethylsilyl derivatives of thyroxine and sixteen related
compounds are reported. In addition to deiodinated analogues and iodinated tyrosines, the …

The qualitative and quantitative gas-chromatographic evaluation of the iodothyronines is
described. Two procedures were compared to prepare the volatile derivatives of the …

Since that time the physiologic activitj7" of thyronine derivatives has been a matter of
considerable interest. In the early years, two methods of assay were mainly used; the first …

The determination of thyroid hormones is widely used for the diagnosis and therapy control
of thyroid disorders. In particular, thyroxine in serum is one of the most frequently determined …

The components of a gas chromatographic mass spectrometric‐selected ion monitoring
(SIM) assay for thyroxine (T4) in human serum are described. The internal standard for the …

The serum pattern of thyroid hormones in 26 euthyroid and 28 hyperthyroid subjects was
studied by paper chromatographic techniques after the oral administration of radioactive …

We describe a simultaneous, absolute analysis for free (dialyzable) triiodothyronine and
thyroxine in serum by the sequence: dialysis, internal standard addition to the dialysate …

A sensitivie, reliable gas-chromatographic assay for monoiodotyrosine and diiodotyrosine in
human serum is reported. The oxazolidinone-heptafluorobutyric anhydride derivatives allow …