PubMed · 7980788
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T C Wascher, P Dittrich, H Toplak, W G Graier. 1994-08-20. Endothelial dysfunction in hypertension.. https://doi.org/10.1016/s0140-6736(94)91946-1
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Nigrosin binds to proteins yielding a dark blue complex. This reaction is used for detecting low protein concentrations in urine by applying spots of urine to cellulose acetate strips which are coloured by nigrosin. The intensity of coloured spots remaining after washing of the strips indicates protein concentration. With a cut-off at 50 mg protein/l, the test offers an excellent possibility for first line screening for microalbuminuria at lowest cost.
For about 25 years, bromcresol green and bromcresol purple have been the basis for most of the measurements of serum albumin in the US and perhaps in the world. The longevity of the methods is due to their being simple, sensitive, specific, inexpensive and relatively free from interferences. The lack of change in the serum albumin methodology is balanced by two important developments. First, the recognition of the importance of serum albumin in the maintenance of good health, and the association of decreased concentrations with increased risk of morbidity and mortality. Second, the association of albuminuria with diabetic nephropathy, which without medical intervention could lead to end-stage renal disease. The development of accurate and precise methods for urinary albumin has provided a tool to physicians to extend the length and improve the quality of life of many diabetic individuals.
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