Spatial Imaging of Scalp Care Agents via Fluorescence
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Solution Overview
Problem
Current methods for detecting Zinc Pyrithione (ZPT) on the scalp are inadequate, as they are either invasive, alter the physiochemical properties of ZPT, or lack sufficient resolution to distinguish it from the scalp background, necessitating a non-invasive, high-resolution technique that can safely and selectively detect ZPT and other scalp care agents like Piroctone Olamine and Climbazole.
Innovation Solution
A method utilizing actinic radiation to induce autofluorescence and photoconversion of ZPT, characterized by a custom-built microscope with dual excitation arms and emission detectors, allowing for the differentiation of ZPT from scalp skin through fluorescence emission peaks at 415nm and 550-570nm, enabling precise spatial detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tape stripping or cyanoacrylate tape stripping is used to detect ZPT, then the sample can be removed for analysis, but the sample must be removed from the in vivo donor which compromises the dynamic scalp environment context
Solution Approach 1:
The patent replaces mechanical tape stripping with optical detection methods (fluorescence microscopy, confocal microscopy, Raman spectroscopy) that allow in vivo imaging without physical removal of the sample, thereby maintaining the dynamic scalp environment context while achieving detection capability
Solution Approach 2:
The patent uses fluorescent tags or probes as intermediaries that bind to ZPT molecules, enabling optical detection of ZPT distribution on the scalp without requiring sample removal, thus preserving the in vivo context while achieving measurement precision
2Measurement precision
If fluorescence tagging is used to detect ZPT in vivo, then detection is feasible, but the physiochemical properties of ZPT are changed compromising native interaction with skin surface
Solution Approach 1:
The patent detects ZPT by measuring changes in fluorescent parameters (emission intensity, wavelength) of tagged ZPT or by detecting intrinsic fluorescent properties, allowing detection without fundamentally altering ZPT's core physiochemical properties and native skin interactions
3Ease of operation
If infrared imaging or Stimulated Raman Scattering microscopy is used, then detection can be performed, but the resolution is diffraction limited and insufficient
Solution Approach 1:
The patent segments the detection process into multiple optical sections using confocal microscopy or two-photon excitation, eliminating out-of-focus light and achieving optical sectioning that surpasses diffraction limits and provides high spatial resolution
Solution Approach 2:
The patent utilizes two-photon excitation where two low-energy photons are absorbed simultaneously to achieve high-energy excitation, enabling deeper tissue penetration and improved resolution beyond conventional diffraction limits
4Ease of operation
If visible light microscopy or laser scanning is used, then imaging can be performed, but the reflectance profiles or morphologies are not unique enough to separate ZPT from scalp background
Solution Approach 1:
The patent exploits the unique fluorescent emission spectra (color signatures) of ZPT and its tagged derivatives, which emit at specific wavelengths distinct from scalp background, enabling selective detection and separation of ZPT signals through spectral filtering and analysis
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 approach allows for safe, in vivo detection of ZPT and its photoconverted form, providing enhanced resolution and selectivity, enabling accurate spatial mapping of ZPT deposition on the scalp and potentially other scalp care agents, overcoming previous limitations in detection methods.
Implementation Method 1
measuring auto-fluorescent characteristics of a scalp care agent
Implementation Method 2
measuring resulting fluorescent emission of photo-converted scalp care agents
Data Source
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AI summary
The present invention is directed to a method for measuring scalp care agents on/in skin or other substrate comprising the following steps: selecting a location within the treated area on the skin or other substrate; irradiate treated area using an actinic radiation source; and measure a resulting fluorescent emission of the scalp care agent or a photoconverted scalp care agent using either the actinic radiation source or a second radiation source to excite the sample.