Key Manufacturers: Advanced Instruments
Osmometers
Osmometers measure the osmolality of a solution, which is the concentration of dissolved solute particles. In biopharmaceuticals, this is a critical quality attribute (CQA) for parenteral (injectable) products to ensure they are isotonic (matching the osmotic pressure of human blood), preventing pain upon injection and ensuring cell integrity. The most common technique is freezing point depression, where the instrument measures how much the freezing point of the sample is lowered compared to pure water.
Associated Analytical Procedures
Context in Practice: Example Specifications
From: Typical AAV Drug Product Specifications
This instrument is used in the context of measuring the Quality Attribute Osmolality with the following details:
- Purpose / Rationale: Ensures patient comfort and safety (isotonicity) upon injection.
- Typical Acceptance Criteria: Meets product/formulation-specific spec (typically near isotonic; sponsor-justified) (240 to 400 mOsm/kg)
From: Typical mRNA (Drug Substance) Specifications
This instrument is used in the context of measuring the Quality Attribute Osmolality with the following details:
- Purpose / Rationale: Ensures solution compatibility/stability. Product-specific; typically measured only when DS contains osmolytes (e.g., sucrose, trehalose) or is formulated at defined ionic strength.
- Typical Acceptance Criteria: Target ± Range (e.g., Target ± 30 mOsm/kg). Note: Only applicable if DS is stored in a final formulated buffer.