Nanonized CBD Microneedles for Transdermal Delivery
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Solution Overview
Problem
Cannabidiol (CBD) has low water-solubility, low oral bioavailability, and instability in the gastrointestinal system, making it difficult to deliver effectively, especially through transdermal systems due to its extreme lipophilicity, which limits its therapeutic potential.
Innovation Solution
A nanonization method involving dissolving CBD in a good solvent, mixing with a stabilizer, and ultrasonication followed by rotary evaporation to create a nanosized CBD suspension, which is then incorporated into dissolving microneedles to enhance skin penetration and bioavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CBD is delivered through passive diffusion-based transdermal systems, then the CBD can be applied topically, but the CBD remains trapped in stratum corneum due to extreme lipophilicity and cannot reach deeper layers or circulation
Solution Approach 1:
The CBD is segmented into nanoscale particles (50-500 nm) through nanonization process, which enables the drug to penetrate through the microneedle-created channels and reach deeper skin layers and circulation, overcoming the entrapment in stratum corneum
Solution Approach 2:
The particle size parameter of CBD is changed from macroscopic to nanoscale (50-500 nm), and the formulation is modified to include stabilizers and co-solvents, which fundamentally changes the delivery mechanism from passive diffusion to enhanced penetration through microneedle channels
2Reliability
If CBD is administered orally, then the CBD can be delivered systemically, but the low water-solubility and first-pass metabolism result in only 6% oral bioavailability
Solution Approach 1:
The CBD is nanonized to particle sizes of 50-500 nm, which dramatically increases the surface area to volume ratio and dissolution rate according to the Noyes-Whitney equation, thereby improving absorption and bypassing first-pass metabolism when administered through dissolving microneedles
Solution Approach 2:
Stabilizers (poloxamer, Tween, polyoxyethylene alkyl ether, polyvinyl pyrrolidone, hydroxypropyl methyl cellulose, or carboxymethyl chitosan) are introduced as intermediaries to maintain nanosized CBD suspension stability and enhance solubilization, enabling effective drug delivery
3Quantity of substance
If conventional nanosizing methods (oral self-emulsifying systems, nanoliposomes, nanomicelles) are used for CBD, then solubility is partially improved, but the solubilization capacity is limited and system stability is poor
Solution Approach 1:
The formulation uses composite stabilizer systems combining poloxamer with other surfactants (Tween, polyoxyethylene alkyl ether, polyvinyl pyrrolidone, hydroxypropyl methyl cellulose, or carboxymethyl chitosan), creating a synergistic effect that enhances both solubilization capacity and suspension stability compared to single-component systems
Solution Approach 2:
The dissolving microneedle platform serves multiple functions: it provides mechanical penetration through stratum corneum, delivers nanosized CBD particles directly to viable skin layers, and the stabilizer system simultaneously maintains suspension stability and enhances solubilization, eliminating the need for separate stabilization steps
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 method achieves high drug loading efficiency, improved solubilization, and increased bioavailability of CBD, allowing for effective transdermal administration and reduced administration frequency, while maintaining stability and skin penetration.
Implementation Method 1
The CBD is dissolved to a good solvent (i.e., powerful solvent or potent solvent) to obtain CBD-good solvent solution
Implementation Method 2
the mixed solution is ultrasonicated followed by removing the good solvent by rotary evaporation from the mixed solution to obtain the nanosized CBD suspension
Implementation Method 3
the mixed solution is ultrasonicated followed by removing the good solvent by rotary evaporation from the mixed solution to obtain the nanosized CBD suspension
Data Source
AI summary
A nanonization method for cannabidiol (CBD) includes following steps: the CBD is dissolved in a good solvent to obtain a CBD-good solvent solution, the CBD-good solvent solution is added to aqueous solution of a stabilizer to obtain mixed solution, the mixed solution is ultrasonicated followed by removing the good solvent by rotary evaporation from the mixed solution to obtain a nanosized CBD suspension. The stabilizer includes one or more selected from the group consisting of poloxamer, tween, polyoxyethylene alkyl ether, polyvinyl pyrrolidone, hydroxypropyl methyl cellulose and carboxymethyl chitosan. Particle size of the CBD is reduced in the nanonization method for the CBD through the nanonization of insoluble drugs to obtain the nanosized CBD suspension. In the nanosized CBD suspension, nanosized CBD has high solid content. The nanonization method for the CBD achieves solubilization of the CBD.