Cellulose Fiber Oral Film Matrices for High Drug Loading
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Solution Overview
Problem
Conventional oral films have limited active ingredient loading capacity, are unstable due to moisture sensitivity, and require specific manufacturing processes that restrict flexibility and modification, limiting their application to only a few active ingredients and making them unsuitable for personalized therapy.
Innovation Solution
The development of cellulose fiber-based paper-based carrier matrices (smartFilms) that allow for high loading of active ingredients up to 84.2% by weight, separate film formation from loading, and enable easy modification and production, using a process that decouples film formation from loading, allowing for precise and variable dosing and improved bioavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional solvent casting or hot melt extrusion processes are used for oral film manufacturing, then film formation is achieved, but the active ingredient loading capacity is limited to 5-30% by weight
Solution Approach 1:
The manufacturing process is divided into separate stages: film formation first, then active ingredient loading. This segmentation allows the film to be formed without active ingredients, enabling subsequent loading with high concentrations of active ingredients, thereby increasing loading capacity from 5-30% to over 50% by weight
Solution Approach 2:
The film matrix is prepared in advance without active ingredients, creating a pre-formed carrier that can subsequently be loaded with active ingredients. This preliminary action enables flexible dosing and high loading capacity while simplifying the overall manufacturing process
2Ease of operation
If multiple auxiliary materials including plasticizers are used for film formation, then film flexibility is improved, but the number of ingredients increases making the process less suitable for personalized therapy
Solution Approach 1:
Plasticizers and other auxiliary materials are extracted from the film formation process. The patent uses a minimal formulation with only essential ingredients, eliminating the need for plasticizers while maintaining film flexibility through optimized polymer selection and processing conditions
Solution Approach 2:
The patent changes the formulation parameters by using a minimal ingredient list and optimized polymer composition. This allows the film to maintain flexibility without plasticizers, and enables easy adaptation for personalized therapy by simply varying the active ingredient loading
3Quantity of substance
If film formation occurs in the presence of all ingredients including active ingredients, then complete formulation is achieved, but thermal stress during drying or extrusion can disrupt film formation and degrade heat-sensitive active ingredients
Solution Approach 1:
The process is segmented into two distinct stages: film formation without active ingredients, followed by active ingredient loading. This prevents thermal stress during film formation and protects heat-sensitive active ingredients while ensuring complete formulation in the final product
Solution Approach 2:
The film matrix is formed in advance without active ingredients, avoiding thermal stress on sensitive compounds. The active ingredients are then added in a separate loading step, ensuring their stability while achieving complete formulation
4Ease of manufacture
If hydrophilic structuring polymers are used in oral films, then film formation is facilitated, but indefinite water absorption occurs leading to instability for moisture-labile ingredients
Solution Approach 1:
The patent optimizes polymer selection and formulation parameters to achieve the right balance of hydrophilicity for film formation while controlling water absorption. The minimal formulation approach and optimized polymer composition prevent excessive water uptake, maintaining stability for moisture-labile active ingredients
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
SmartFilms enable high loading of active ingredients, enhance bioavailability, and allow for flexible and cost-effective production of oral films with improved stability and ease of modification, expanding the range of applicable active ingredients and enabling personalized medicine.
Implementation Method 1
The self-adhesion and matting of fibers as well as subsequent compaction and drying result in a sheet-like structure, which is used as a smartFilm to produce layer-like products for oral and peroral application
Implementation Method 2
cellulose fiber-based paper-based carrier matrices (smartFilms) that allow for high loading of active ingredients
Data Source
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AI summary
Stable, physiologically cellulose fiber-based paper-based carrier matrix (smartFilm) for the production of film products for oral and peroral application, comprising sheet-like to cuboidal fibrous cellulose in the form of a durable paper material consisting of one or more layers with a crystallinity index of 1 ≤ KrI ≤ 200, an apparent sheet density of 0.10 ≤ ρ ≤ 2.00 g/cm³, a water absorption capacity of 10 ≤ mWater absorption ≤ 2,000 % (m/m), an average pore diameter of 1 ≤ dPore 200 µm and a water content of 1.0 ≤ w ≤ 20.0 % (m/m) loaded with ingredients, in particular active ingredients, and the process for the production of the film products.