STANDARDIZATION OF THYROID PREPARATIONS

A colorimetric method for the standardization of heparin preparations.

IT is a fact well known to histologists that certain basic dyes undergo a change of tint when taken up by particular tissue elements, especially cartilage, mucus and the granules of the so-called 'mast cells'. The chemistry of this phenomenon, named 'metachromasia' by Ehrlich, has been studied in some detail by Lison [1935], This investigator concluded that the change of colour in the dye is du...

Cavity preparation machine for the standardization of in vitro preparations.

Several in vitro studies employ the confection of cavity preparations that are difficult to standardize by means of manual high speed handpieces. This study presents the development of a cavity preparation machine designed to standardize in vitro cavity preparations. A metal base of 25 mm x 25 mm x 4 mm (length x width x height) was coupled to a small mobile table which was designed to be able ...

Harmonization and standardization of thyroid function tests.

This issue of Clinical Chemistry contains 3 reports from the IFCC Working Group for Standardization of Thyroid Function Tests. The first report relates to thyroidstimulating hormone (TSH) (1 ), the second addresses free thyroxine (FT4) and free triiodothyronine (FT3) (2 ), and the third discusses total thyroxine (T4) and total triiodothyronine (T3) (3 ). Each of these reports is authored by a g...

Hormonal content of thyroid replacement preparations.

Standardization of the method for estimation of ethambutol in pharmaceutical preparations and biological fluid.

A simple column chromatographic method for determination of ethambutol (EMB) in pharmaceutical preparations containing EMB in combination with other anti-TB drugs is presented. The method involved extraction of EMB into an organic solvent, followed by basification and column chromatographic separation on Amberlite CG 50 (100-200 mesh) and elution with suitable eluants and estimation at a wavele...