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Re-evaluation of the fructosamine reaction
G Phillipou1, C J Seaborn, P J Phillips
1Endocrine and Diabetes Laboratory, Queen Elizabeth Hospital, Woodville, South Australia.
Clinical Chemistry
|August 1, 1988
Summary
This study improves the fructosamine assay for diabetes monitoring by adding Triton X-100, enhancing accuracy. Dihydroxyacetone is preferred over 1-deoxy-1-morpholinofructose as a calibration standard for better results.
Area of Science:
- Clinical Chemistry
- Biochemical Assays
- Diabetes Diagnostics
Background:
- The fructosamine assay measures glycated proteins, providing a long-term glycemic control indicator.
- Spectral differences between 1-deoxy-1-morpholinofructose (DMF) and protein samples in the assay are linked to diformazan solubility.
- Nitro blue tetrazolium chloride reduction forms diformazan, influencing assay characteristics.
Purpose of the Study:
- To address spectral anomalies in the fructosamine reaction.
- To optimize calibration standards and reaction conditions.
- To investigate the contribution of trioses to plasma fructosamine measurements.
Main Methods:
- Addition of Triton X-100 surfactant to the reagent buffer.
- Comparative analysis of 1-deoxy-1-morpholinofructose (DMF) and dihydroxyacetone as calibration standards.
- Investigation of reaction kinetics for Amadori rearrangement products.
Main Results:
- Triton X-100 corrected spectral anomalies and enhanced the assay's response.
- Dihydroxyacetone demonstrated a clear preference over DMF as a calibration standard.
- Distinct reaction kinetics were observed between DMF and glycated albumin.
Conclusions:
- Triton X-100 is beneficial for improving the fructosamine assay.
- Dihydroxyacetone is a more suitable calibration standard for the fructosamine reaction.
- Trioses like dihydroxyacetone and glyceraldehyde may play a role in differentiating diabetic and non-diabetic plasma samples.