Purified Exosome Products: Lyophilization for Room-Temperature Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-healing wounds in patients with pathophysiological defects such as diabetes, peripheral vascular disease, or infection are a significant medical problem due to inadequate growth factor production, reduced angiogenesis, and impaired cell migration, which disrupt the wound healing process.
Innovation Solution
A novel purified exosome product (PEP) is prepared from blood or non-blood sources, cryodesiccated to maintain a spherical structure with a diameter of no more than 300 nm and low moisture content, which is then reconstituted for administration to enhance wound healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exosomes are purified and stored in liquid form, then they maintain biological activity, but they require refrigeration which limits shelf life and portability
Solution Approach 1:
The patent applies freeze-drying (lyophilization) to transition exosomes from liquid to solid state. This phase transition removes water while preserving exosome structure and biological activity, enabling long-term storage at room temperature without refrigeration for up to 6 months
Solution Approach 2:
The patent changes the moisture content parameter from high (liquid form requiring refrigeration) to low (freeze-dried form with ≤10% moisture), fundamentally altering storage requirements and enabling room temperature stability while maintaining biological functionality
2Ease of manufacture
If exosomes are aggregated in bulk form, then they are easier to store and transport, but they lose spherical structure and biological potency
Solution Approach 1:
The patent segments exosomes into individual spherical units during freeze-drying rather than allowing bulk aggregation. Each exosome maintains its discrete spherical structure with diameter ≤300 nm, preserving biological potency while enabling stable storage
Solution Approach 2:
The patent specifically preserves and characterizes the spherical morphology of exosomes throughout the freeze-drying process. The spherical structure with diameter ≤300 nm is maintained as a critical quality attribute, ensuring biological functionality is retained
3Manufacturing precision
If exosomes are highly purified to remove all other components, then product purity increases, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts exosomes from complex biological fluids (blood, plasma, serum) using simplified methods that remove bulk contaminants while preserving exosome integrity. The freeze-drying process further concentrates and purifies exosomes by removing water and other components
Solution Approach 2:
The patent uses moisture content (≤10%) as a key purification parameter that simultaneously indicates both purity and stability. This single parameter control simplifies the purification process while ensuring high exosome purity and long-term stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
PEP accelerates wound healing by increasing vascularization and epithelization, inhibiting neoplasia, and promoting rapid cell growth, offering a shelf life of up to six months without refrigeration.
Implementation Method 1
cryodesiccated to maintain a spherical structure with a diameter of no more than 300 nm and low moisture content
Data Source
AI summary
A purified exosome product includes spherical or spheroid exosomes with a diameter no greater than 250 nm. In some embodiments, the purified exosome product has a moisture content of no more than 10%. The purified exosome product can be reconstituted to prepare an artificial blood product.