Capillary Zone Electrophoresis of Serum Proteins: Effects of Changed Analytical Conditions
-
Paola Luraschi
Abstract
Analytical conditions in a system for capillary zone electrophoresis (Beckman Paragon CZE 2000) were originally selected to allow serum protein separation into five discrete protein zones, corresponding to those of conventional clinical electrophoresis. To improve the system's performance, new analytical conditions have been made available. We compared the two sets of conditions ("new" = y; "old" = x) for possible variations of results caused by the change. One hundred thirteen serum samples, covering wide intervals of values, were assayed on two twin instruments working under the old and the new conditions; results were assessed statistically and graphically. Possible clinical significance of differences was checked by comparison with the biological variation-based quality specifications for bias. Statistically significant (y-x) differences were observed for the α1-, α2- and β-globulin zones; clinically significant differences were observed for all the zones, with the exception of the γ-globulin zone. Therefore, old/new regression equations were calculated, whose reliability was assured by the wide interval of values, by the large sample size, and by the low dispersion of single values around the mean concordance estimates. Such equations may be used to convert "old" into "new" reference values, and for the intercomparison of patient results obtained under different analytical conditions.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Editorial
- Biomedical Applications of Capillary Electrophoresis
- Capillary Electrophoresis – A High Performance Analytical Separation Technique
- The Analysis of Carbohydrate-Deficient Transferrin, Marker of Chronic Alcoholism, Using Capillary Electrophoresis
- Capillary Electrophoresis of Hemoglobin
- Capillary Electrophoresis for the Determination of Organic Acidurias in Body Fluids: A Review
- Separation of Serum Proteins by Automated Capillary Zone Electrophoresis
- Is Capillary Electrophoresis a Method of Choice for Systematic Toxicological Analysis?
- Capillary Zone Electrophoresis of Serum Proteins: Effects of Changed Analytical Conditions
- Type-Specific Detection of Human Papillomaviruses in a Routine Laboratory Setting – Improved Sensitivity and Specificity of PCR and Sequence Analysis Compared to Direct Hybridisation
- Identification of Lipoproteins of Intestinal Origin in Human Atherosclerotic Plaque
- Molecular Cloning, Sequencing and Functional Expression of Porcine Thyrotropin (TSH) Receptor cDNA
- Are Results of Fibrinogen Measurements Transferable?
- Comparison of Several Point-of-Care Testing (POCT) Glucometers with an Established Laboratory Procedure for the Diagnosis of Type 2 Diabetes Using the Discordance Rate. A New Statistical Approach
- Association between Increased Serum Cholesterol and Signs of Depressive Mood
- Report from the Second European Symposium on Clinical Laboratory and in vitro Diagnostic Industry. Physiological Reference Values: A Shared Business? Barcelona, 67 February 2003
- Meetings and Awards
Articles in the same Issue
- Editorial
- Biomedical Applications of Capillary Electrophoresis
- Capillary Electrophoresis – A High Performance Analytical Separation Technique
- The Analysis of Carbohydrate-Deficient Transferrin, Marker of Chronic Alcoholism, Using Capillary Electrophoresis
- Capillary Electrophoresis of Hemoglobin
- Capillary Electrophoresis for the Determination of Organic Acidurias in Body Fluids: A Review
- Separation of Serum Proteins by Automated Capillary Zone Electrophoresis
- Is Capillary Electrophoresis a Method of Choice for Systematic Toxicological Analysis?
- Capillary Zone Electrophoresis of Serum Proteins: Effects of Changed Analytical Conditions
- Type-Specific Detection of Human Papillomaviruses in a Routine Laboratory Setting – Improved Sensitivity and Specificity of PCR and Sequence Analysis Compared to Direct Hybridisation
- Identification of Lipoproteins of Intestinal Origin in Human Atherosclerotic Plaque
- Molecular Cloning, Sequencing and Functional Expression of Porcine Thyrotropin (TSH) Receptor cDNA
- Are Results of Fibrinogen Measurements Transferable?
- Comparison of Several Point-of-Care Testing (POCT) Glucometers with an Established Laboratory Procedure for the Diagnosis of Type 2 Diabetes Using the Discordance Rate. A New Statistical Approach
- Association between Increased Serum Cholesterol and Signs of Depressive Mood
- Report from the Second European Symposium on Clinical Laboratory and in vitro Diagnostic Industry. Physiological Reference Values: A Shared Business? Barcelona, 67 February 2003
- Meetings and Awards
