title: Standardization of the Coomassie Blue method for cerebrospinal fluid proteins.
abstract: Coomassie Brilliant Blue G-250 can be used to quantitatively determine proteins in cerebrospinal fluid. When the dye combines with protein, the absorption maximum of the dye shifts. The dye-protein color forms almost instantaneously and is stable for at least 1 h. The procedure is also insensitive to changes in temperature in the range of 20--30 degrees C. The absorptivities of the dye complexes with human albumin or globulin differ, thus a pure albumin or pure globulin standard is unsuitable; a standard containing 70% albumin and 30% globulins is the most appropriate for this application. A bichromatic approach to standardization increases the range of linearity of a calibration curve. The method gives values that are about 9% higher than a sodium sulfate-sulfosalicylic turbidimetric procedure for cerbrospinal fluid proteins.
mesh_terms: D002556:Cerebrospinal Fluid Proteins / Q000032:analysis*; D006801:Humans; D008722:Methods; D011485:Protein Binding; D012015:Reference Standards; D012394:Rosaniline Dyes; D012709:Serum Albumin; D012712:Serum Globulins
chemical_list: D002556:Cerebrospinal Fluid Proteins; D012394:Rosaniline Dyes; D012709:Serum Albumin; D012712:Serum Globulins