Stability of Lolium perenne extract

Area of Science:

• Allergy research
• Plant extract stability
• Immunology

Background:

• Lolium perenne (ryegrass) is a common source of allergenic pollen.
• Understanding allergen extract stability is crucial for effective immunotherapy.
• Standardized extracts are essential for consistent clinical outcomes.

Purpose of the Study:

• To evaluate the long-term stability of Lolium perenne allergen extracts.
• To determine optimal storage conditions for maintaining allergen activity.
• To assess the impact of different storage methods and preservatives on extract integrity.

Main Methods:

• Allergen activity assessed using in vivo and in vitro methods.
• Protein structural changes analyzed via polyacrylamide gel electrophoresis and isoelectric focusing.
• Stability tested under various storage conditions: frozen, lyophilized, refrigerated, room temperature, and 40°C.

Main Results:

• Lyophilized and frozen Lolium perenne extracts maintained full allergen activity over one year.
• Refrigerated aqueous extracts showed gradual activity loss, unlike glycerinated samples.
• High temperatures and the preservative phenol significantly reduced extract stability.

Conclusions:

• Freezing or lyophilization are recommended for long-term Lolium perenne extract storage.
• Glycerol enhances extract stability at refrigerated temperatures.
• Phenol negatively impacts Lolium perenne extract stability, necessitating careful consideration in formulation.