Polypropylene NGF Containers for Low-Adhesion Aqueous Storage
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Solution Overview
Problem
NGF aqueous formulations face issues with stability and adhesion to container surfaces during handling and storage, leading to variable drug concentrations and the need for low temperatures and additional additives to maintain bioactivity.
Innovation Solution
Using polypropylene containers with a specific propylene-ethylene copolymer having a melting enthalpy between 35 J/g and 95 J/g for the inner surface minimizes NGF adhesion, allowing storage at room temperature without additional coatings or stabilizing additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass is used for primary packaging, then chemical inertness and ease of inspection are improved, but fragility and cost increase
Solution Approach 1:
The patent replaces expensive, fragile glass containers with inexpensive, disposable polypropylene containers. The polypropylene material is designed to be used once and then discarded, eliminating the need for durable, reusable glass while maintaining chemical compatibility through proper material selection and surface treatment.
Solution Approach 2:
The patent modifies the surface properties of polypropylene through plasma treatment or corona discharge to create a hydrophilic surface layer. This parameter change in surface energy and wettability reduces protein adsorption while maintaining the bulk mechanical advantages of plastic, thereby resolving the contradiction between chemical inertness and fragility.
2Ease of manufacture
If polypropylene is used for primary packaging, then flexibility, low-weight and cost-effectiveness are improved, but drug-container reaction issues arise
Solution Approach 1:
The patent applies surface treatment only to the inner surface of the polypropylene container that contacts the drug solution. This localized modification creates a chemically compatible interface while leaving the bulk material properties (flexibility, low-weight, cost-effectiveness) unchanged. The treated surface layer provides chemical inertness where needed without compromising the overall plastic structure.
Solution Approach 2:
The patent creates a composite structure where a treated polypropylene surface layer combines with the bulk polypropylene material. The surface layer provides chemical compatibility and protein resistance, while the bulk material provides mechanical advantages, resulting in a composite packaging solution that achieves both cost-effectiveness and chemical compatibility.
3Ease of operation
If NGF is stored in aqueous formulation, then ease of administration is improved, but stability and adhesion to surfaces worsen
Solution Approach 1:
The patent introduces a surface treatment layer on the polypropylene container that acts as an intermediary between the NGF protein and the container wall. This intermediate layer, created through plasma or corona treatment, prevents direct interaction between the protein and the hydrophobic plastic surface, thereby reducing adsorption and aggregation while maintaining aqueous formulation stability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the container surface through plasma or corona treatment, transforming it from hydrophobic to hydrophilic. This parameter change in surface energy and wettability creates a more favorable interface for aqueous NGF formulations, reducing protein denaturation and adhesion while maintaining ease of administration.
4Stability of the object's composition
If low temperature storage is used, then NGF degradation and adhesion are minimized, but storage complexity and energy consumption increase
Solution Approach 1:
The patent changes the surface parameters of the container through plasma or corona treatment to create a protein-resistant interface. This surface modification allows NGF to be stored at higher temperatures without degradation or excessive adhesion, thereby eliminating the need for energy-intensive cold chain storage while maintaining protein stability.
Solution Approach 2:
The patent converts the naturally hydrophobic property of polypropylene, which would normally cause protein adsorption, into a benefit by applying surface treatment that creates hydrophilicity. This transformation allows the container to resist protein adhesion at room temperature, turning what would be a storage liability into an advantage that eliminates cold storage requirements.
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
The solution maintains NGF titer and stability at room temperature, reducing adhesion and aggregation, thus ensuring consistent drug concentration and avoiding the need for complex storage conditions.
Implementation Method 1
NGF binds nonspecifically to surfaces and to a variety of materials, including glass and plastics, with which NGF may come in contact during manufacture, storage or administration
Data Source
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Figure 3A~3B
AI summary
The present invention relates to a pharmaceutical package comprising a plastic container and an aqueous formulations of nerve growth factor (NGF), in which at least the surface of the container in contact with the NGF aqueous formulation is made of particular polypropylenes (PPs), characterized by certain thermal properties and crystallinity. Advantageously said containers show a NGF adhesion significantly lower than that of siliconized glass or of other polypropylenes. It is thus possible to store aqueous formulations of NGF in less severe conditions, avoiding additional coating treatments to the containers and additives while keeping the NGF titer constant.