Optimization of Anti-Rh D Immunoglobulin Stability in the Lyophilization Processes

Document Type : Original Article

Authors

1 Immuno-Biochemistry Lab, Immunology Research Center, Mashhad University of Medical Sciences, Avicenna Research Institute, Mashhad, Iran

2 School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran

3 School of Pharmacy and Biotechnology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

Abstract

Objective
Anti-Rh D IgG is used for the prevention of anti-D antibody production in Rh- individuals who have been exposed to Rh+ red blood cells. The stability of IgG preparations as a solution is low, with a shelf life of a year or more. Formulation of anti-Rh D IgG as a lyophilized preparation would decrease its degradation rate and increases its shelf life. The objective of this study was to formulate the anti-Rh D as a lyophilized preparation using different formulations and optimize the lyophilization processes.
Materials and Methods
The effect of various formulations on the stability of anti-Rh D was evaluated using accelerated stability test.  In this method the amount of transmittance (T %) at 585 nm for the lyophilized preparations had inverse relationship with aggregation of anti-Rh D. To improve stability, the most stable formulation was selected and different concentrations of sucrose in the presence of sodium-potassium phosphate buffer 25 mM pH 7.5. Then, the bioactivity was determined, using the ELAT test and also, the amount of moisture measured in this formulation.
Results
Among different formulations, the one with anti-Rh D 5 mg/ml, tween 80 0.1%, glycine 0.15 M, manitol 7% and sucrose 60 mM in sodium-potassium phosphate buffer 25 mM pH 7.5 was the most stable formulation (P<0.05). The result of biological test of ELAT showed that bioactivity of more than 93% meets the requirement set by British Pharmacopoeia. The amount of moisture measured in this formulation was less than 3%.   
Conclusion
It was concluded that this formulation could be introduced as a candidate for the formulation of anti-Rh D in a lyophilized dosage form.

Keywords

References

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