Gel Filtration Makes a Nonincinerative Assay of Thyroxine Available for Chicken Plasma

Gel filtration of sialoglycoproteins.

The role of sialic acid in the gel-filtration behaviour of sialoglycoproteins was investigated by using the separated isoenzymes of purified human liver alpha-L-fucosidase and several other well-known sialic acid-containing glycoproteins (fetuin, alpha1-acid glycoprotein, thyroglobulin and bovine submaxillary mucin). For each glycoprotein studied, gel filtration of its desialylated derivative g...

Gel-Filtration Chromatography.

Gel-filtration chromatography is a versatile method that permits the effective separation of biological molecules in high yield. This article describes the basis of the method, the selection of suitable operating conditions, and contrasts typical matrix types. Applications of the technique are described, with references to the scientific literature.

A High-Performance Liquid Chromatographic Assay for the Determination of Losartan in Plasma

A rapid and sensitive HPLC method was developed for determination of losartan in plasma. Losartan was extracted from plasma by a two-step extraction procedure using chloroform as extracting solvent in acidic medium. HPLC analysis was performed on a cyano reversed-phase column using phosphate buffer (pH 4.3), acetonitrile (750:250, v/v) as mobile phase with a flow rate of 0.9 mL/min. Sodium dicl...

Making plasma derived medicines available

Clinical problems with a free thyroxine assay.

THE measurement of serum free thyroxine (FT4), which forms a small fraction (0.01-0.05 per cent) of the circulating total thyroxine (TT4), might be expected to provide the most accurate single biochemical index of thyroid status, on the basis that only free hormone is bioavailable. The conventional estimation of FT4 by equilibrium dialysis' is time consuming and the arrival of radioimmunoassay ...