Solution-Type Hydroxydiphenylethane Ointment for Light Stability
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Solution Overview
Problem
Existing ointments for poorly soluble drugs are predominantly suspension-type, leading to inefficient drug penetration and stability issues, with challenges in selecting suitable excipients and formulations that affect transdermal absorption and light stability, limiting their clinical application, especially on exposed areas like the head and face.
Innovation Solution
A solution-type ointment for hydroxydiphenylethane compounds using a combination of vaseline, medium-chain triglycerides, and isopropyl palmitate/isopropyl myristate, with a mathematical model to predict solubility, ensuring the active ingredient remains dissolved and stable, and incorporating an antioxidant for light protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If suspension-type ointment is used for poorly soluble drugs, then the drug can be dispersed in the matrix, but the drug penetration efficiency is low and batch variability is high
Solution Approach 1:
The patent changes the physical state parameter of the drug from suspended particles to dissolved molecular form by selecting appropriate solubilizers and penetration enhancers, transforming the ointment from suspension-type to solution-type, thereby improving penetration efficiency and reducing batch variability
Solution Approach 2:
The patent uses composite excipient systems combining multiple components (solubilizers, penetration enhancers, and ointment base) to achieve both high drug solubility and stable batch-to-batch performance, resolving the contradiction between penetration efficiency and reliability
2Productivity
If solution-type ointment is used to improve drug dissolution and penetration, then transdermal absorption is enhanced, but selecting suitable excipients is challenging and formulation complexity increases
Solution Approach 1:
The patent introduces intermediary substances (solubilizers and penetration enhancers) that mediate between the insoluble drug and the ointment matrix, enabling the drug to dissolve and penetrate the skin effectively while maintaining formulation manageability
Solution Approach 2:
The patent optimizes concentration parameters of excipients to achieve the minimum effective amounts needed for drug dissolution and penetration enhancement, reducing formulation complexity while maintaining high transdermal absorption
3Reliability
If hydroxydiphenylethane compound is used for its pharmaceutical activity, then therapeutic effect is achieved, but the compound is light-unstable and requires light protection
Solution Approach 1:
The patent converts the light-instability characteristic into a manageable parameter by incorporating light-protective measures in the formulation or packaging, allowing the compound to be used therapeutically while protecting it from light degradation
Solution Approach 2:
The patent introduces light-protective excipients or packaging materials as intermediaries that shield the hydroxydiphenylethane compound from light exposure, maintaining its therapeutic efficacy while preventing light-induced degradation
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 ointment achieves uniform, stable drug delivery with good transdermal absorption and light stability, allowing use on exposed areas without the need for light shielding, enhancing patient compliance and clinical effectiveness.
Implementation Method 1
diphenylethane derivatives containing hydroxyl groups are very easy to be degraded by light... incorporating an antioxidant for light protection
Implementation Method 2
In solution-type ointments, the API is dissolved or co-dissolved in the matrix or matrix components
Implementation Method 3
Ointment can form a closed barrier on the skin surface with good moisturizing effect
Implementation Method 4
The API in molecular form can diffuse out of the matrix better and penetrate into the skin
Data Source
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AI summary
Provided are a solution-like hydroxydiphenylethane compound ointment, use thereof, and a method for preparing same. The ointment comprises: 0.001 wt%-3 wt% of an active ingredient hydroxydiphenylethane compound, 0.01%-1% of an antioxidant, and the balance of an ointment matrix. The ointment matrix comprises vaseline and/or liquid paraffin, a medium-chain triglyceride, and isopropyl palmitate and/or isopropyl myristate. The hydroxydiphenylethane compound ointment features good drug solubility and transdermal performance, good photostability, and no need for shading in use, and is thus suitable for use on areas exposed to the light, such as the head, face, and other regions.