Thermogelling Nanoemulsions for Hydrophobic API Size and Loading Control
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Solution Overview
Problem
Conventional oral drug formulations face challenges with poor bioavailability of hydrophobic APIs due to their poor water-solubility, requiring costly and inefficient manufacturing processes, and lack of control over API nanocrystal sizes and loadings, leading to potential overdosing or ineffective treatments.
Innovation Solution
A thermogelling nanoemulsion system is developed using thermal processing methods to create composite particles with hydrophobic API nanocrystals embedded in a thermogelling polymer matrix, allowing precise control over drug loadings and sizes through the use of methylcellulose (MC) and surfactants like TWEEN® 80, forming stable nanoparticles with high drug loadings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oral drug formulations are used for hydrophobic APIs, then manufacturing processes are simple, but bioavailability is poor due to poor water-solubility
Solution Approach 1:
The patent segments the hydrophobic API into nanocrystal form (1-1000 nm size range) and incorporates them into a thermogelling polymer matrix, creating a segmented structure that improves water solubility and bioavailability while maintaining manufacturing simplicity through a single-step hot-melt extrusion process
Solution Approach 2:
The patent creates a composite material system combining hydrophobic API nanocrystals with thermogelling polymers (methylcellulose, hydroxypropyl methylcellulose) to form a unified dosage form that simultaneously addresses solubility issues and simplifies manufacturing by integrating multiple functions into one composite structure
2Reliability
If API nanocrystals are produced to improve solubility and bioavailability, then solubility is improved, but control over nanocrystal sizes and loadings is poor leading to overdosing or ineffective treatment
Solution Approach 1:
The patent utilizes parameter changes in the thermogelling polymer's gelation temperature and viscosity to control nanocrystal formation during hot-melt extrusion, allowing precise control over nanocrystal size distribution and drug loading by adjusting processing parameters such as temperature, shear rate, and polymer concentration
Solution Approach 2:
The patent implements a feedback mechanism where the thermogelling polymer's phase transition behavior during processing provides real-time control over nanocrystal formation, with the polymer's gelation and melting properties serving as self-regulating feedback to maintain consistent nanocrystal sizes and loadings
3Adaptability or versatility
If multiple blending, sieving, and granulation steps are used to formulate cellulose ethers and hydrophobic APIs, then formulation flexibility is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges multiple formulation steps (blending, granulation, size control) into a single hot-melt extrusion process where the thermogelling polymer simultaneously performs binding, granulation, and size control functions, dramatically improving manufacturing efficiency while maintaining formulation flexibility through adjustable processing parameters
4Quantity of substance
If high drug loadings are achieved in nanoemulsions, then therapeutic efficacy is improved, but control over uniform nanocrystal sizes becomes difficult
Solution Approach 1:
The patent applies local quality control by creating uniform nanocrystal regions within the thermogelling matrix through controlled phase separation during hot-melt extrusion, ensuring consistent nanocrystal sizes even at high drug loadings by localizing crystallization events to specific zones within the extruded material
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 system enables efficient and controlled delivery of hydrophobic therapeutic agents with improved bioavailability by ensuring uniform nanocrystal sizes and high drug loadings, overcoming the limitations of conventional formulations.
Implementation Method 1
Reversible thermal gelation is another 'smart' property of MC and HPMC that has gained considerable attention in the field of rheology. The polymer gels upon heating and returns to the sol state upon subsequent cooling
Implementation Method 2
Upon contact with water, a gel layer can form on the polymer surface due to rapid hydration, which slows down further water penetration into the inner dry polymer core
Implementation Method 3
The in situ templating is achieved via ultrasonic cavitation of a nanoemulsion containing the hydrophobic drug in an oil phase
Data Source
AI summary
Compositions contain nanoparticles containing nanocrystals of hydrophobic therapeutic, diagnostic, prophylactic agents, or a combination thereof, encapsulated in thermogelling polymers, such as methyl cellulose. Because of the templating of the compositions on a thermogelling nanoemulsion system, the compositions can be formed with precise control of the sizes of the nanoparticles as well as the high loadings of these hydrophobic therapeutic, diagnostic, prophylactic agents, or a combination thereof. Also described are methods of making and using the compositions.