Fluorescence-Based Efficacy Testing for Cosmetic Barrier Protection
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Solution Overview
Problem
Current methods for evaluating the efficacy of cosmetic compositions in preventing particulate pollutants from contacting skin lack robustness and accuracy, often resulting in erroneous observations due to interference from ingredients that produce false positive results, making it difficult to compare the effectiveness of different compositions.
Innovation Solution
A fluorescence-based method involving a sample holder with a defined layer of cosmetic composition, where a model fine particulate matter responsive to fluorescence microscopy is used to assess the composition's ability to inhibit pollutant penetration, with corrected intensity of fluorescence calculated to minimize interference and provide a more accurate measure of efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to evaluate cosmetic compositions, then the evaluation process is simple, but the measurement precision and reliability are poor due to false positive results from ingredient interference
Solution Approach 1:
The patent introduces a model fine particulate matter as an intermediary substance that mimics real atmospheric pollutants but can be detected by fluorescence microscopy. This mediator allows indirect measurement of pollutant penetration through the cosmetic layer without using actual complex pollutant mixtures, thereby improving measurement precision while keeping the method manageable in complexity
Solution Approach 2:
The patent replaces conventional mechanical or chemical detection methods with fluorescence-based optical detection. By using fluorescently labeled model particles and fluorescence microscopy, the system substitutes traditional measurement approaches with optical detection, achieving higher sensitivity and precision in evaluating cosmetic composition efficacy
2Reliability
If real atmospheric pollutants are used for testing, then the evaluation reflects real-world conditions, but the reliability decreases because it is not always possible to perform tests with real pollutants
Solution Approach 1:
The patent creates a simplified copy or model of real atmospheric pollutants using fluorescently labeled fine particulate matter. This model reproduces the key physical characteristics and penetration behavior of real pollutants while enabling consistent, repeatable fluorescence-based detection, thereby achieving both reliability and adaptability
Solution Approach 2:
The patent changes the detectable parameter of the pollutant model by introducing fluorescent labeling. This parameter change allows the model particles to be detected optically while maintaining their physical similarity to real pollutants, enabling consistent measurement across different test conditions while representing pollutant behavior accurately
3Measurement precision
If cosmetic compositions contain multiple ingredients, then the composition provides comprehensive protection, but the measurement precision deteriorates due to interference from ingredients that produce false positive results
Solution Approach 1:
The fluorescently labeled model particles serve as an intermediary that specifically reports on pollutant penetration without being affected by cosmetic ingredients. The fluorescence signal comes from the model particles themselves rather than from interactions between ingredients, thereby eliminating false positive results while maintaining comprehensive composition testing
Solution Approach 2:
The patent uses fluorescence (a form of light emission/color change) as the detection mechanism. The fluorescent signal from the model particles provides a specific, quantifiable measure of penetration that is distinct from any color changes or optical effects produced by cosmetic ingredients, thereby improving signal accuracy by separating the measurement signal from potential interference
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
This method allows for objective analysis of the dynamic penetration of model pollutants over time, enabling a precise determination of short-term and longer-term efficacy of cosmetic compositions in forming a barrier against particulate atmospheric pollutants, thereby distinguishing between efficacious and non-efficacious compositions.
Implementation Method 1
a model fine particulate matter which resembles an atmospheric pollutant at least in size and which comprises a material responsive to fluorescence microscopy which is excitable by a wavelength (λex) and which emits radiation (λem)
Implementation Method 2
where said average transmittance is the average of the transmittance of the composition measured at λex and λem determined by Beer-Lambert law by measuring the absorbance at λex and λem
Data Source
AI summary
Disclosed is a method of determining efficacy of a cosmetic composition to inhibit an atmospheric pollutant from contacting skin, comprising the steps of: (i) filling a sample holder of known dimensions with known amount of said composition to form a layer of defined thickness therein, where said sample holder is amenable to fluorescence-based assay; (ii) depositing, on said layer, a known amount of a model fine particulate matter which resembles an atmospheric pollutant at least in size and which comprises a material responsive to fluorescence microscopy which is excitable by a wavelength (λex) and which emits radiation (λem) where (λex)≠(λem); (iii) irradiating said composition and said model fine particulate matter by said λex and recording intensity of fluorescence at λem a plurality of times for a defined period during which said model fine particulate matter interacts with said layer; and, (iv) determining, corrected intensity of fluorescence at λem by the following equation; corrected Intensity=recorded intensity/average transmittance where said average transmittance is the average of the transmittance of the composition measured at λex and λem determined by Beer-Lambert law by measuring the absorbance at λex and λem, where the corrected intensity is inversely proportional to said efficacy of said composition.