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Soluble IgG aggregates produced by heating remain stable on freeze-drying
Journal of Immunological Methods
|September 3, 1985
Summary
Freeze-dried heat-aggregated immunoglobulin G (IgG) preparations remain stable for at least four months at 4°C. These stable IgG aggregates show minimal changes, making them suitable for standardizing immune complex assays.
Area of Science:
- Immunology
- Biochemistry
- Analytical Chemistry
Background:
- Immunoglobulin G (IgG) aggregates are crucial in immunological studies and assays.
- Standardization of immune complex assays requires reliable reference reagents.
- Heat-aggregated IgG is a common reagent, but its stability needs evaluation.
Purpose of the Study:
- To assess the stability and integrity of freeze-dried heat-aggregated IgG.
- To determine the suitability of these preparations as reference reagents for immune complex assays.
Main Methods:
- Gamma globulin solutions were heated to produce IgG aggregates.
- Aggregates were freeze-dried and stored at 4°C for up to 4 months.
- Biological reactivity and physical integrity were compared to frozen (-20°C) preparations.
Main Results:
- Freeze-dried IgG aggregates showed minimal changes in biological reactivity.
- Physical integrity of the aggregates was well-preserved during storage.
- Stability was comparable to, or better than, frozen preparations.
Conclusions:
- Freeze-dried heat-aggregated IgG is a stable preparation.
- These preparations are suitable for use as reference reagents.
- This offers a valuable tool for standardizing immune complex assays.