Hair Sample Integrity Testing via Reducing Agents

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Solution Overview

Problem

Current methods for assessing hair damage are time-consuming and laborious, making them unsuitable for high-volume hair analyte analysis, particularly in determining the presence of drugs in hair samples that have been subjected to cosmetic treatments, which can alter the hair's porosity and affect analyte retention and loss.

Innovation Solution

A rapid and reliable method involving the use of aqueous solutions with reducing agents and proteases to assess hair sample condition, allowing for the differentiation between intact and damaged hair samples, thereby determining their suitability for drug analyte testing, using techniques such as immunoassays or mass spectrometry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional methods for assessing hair damage (microfluorometry, colorimetric staining, microscopy) are used, then measurement precision is improved, but productivity deteriorates due to time-consuming and laborious procedures

Engineering Contradiction:

Improvehair damage assessment accuracyVSAvoidhigh-throughput capability

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces manual mechanical assessment methods (microscopy, staining, slide mounting) with an automated optical detection system that uses image analysis software to quantify hair damage parameters, enabling high-throughput processing while maintaining measurement precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system creates digital copies (images) of hair samples and analyzes them through software algorithms, replacing the need for physical manual examination and enabling multiple analyses of the same sample without additional time investment

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If cosmetic treatments (bleaching, dyeing, perming) are applied to hair, then adaptability or versatility is improved for different hair types, but reliability deteriorates due to increased porosity affecting analyte retention

Engineering Contradiction:

Improvehair treatment optionsVSAvoidanalyte detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system performs preliminary assessment of hair porosity and damage levels before analyte analysis, allowing the selection of appropriate extraction and analysis protocols tailored to each sample's condition, thereby maintaining reliability across treated and untreated hairs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system adjusts analytical parameters (extraction time, solvent composition, temperature) based on the measured porosity and damage level of each hair sample, optimizing analyte recovery for both intact and cosmetically treated hairs

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If hair porosity increases due to cosmetic damage, then ease of operation is improved for analyte extraction, but loss of substance worsens as contaminants enter and compounds are lost from the hair

Engineering Contradiction:

Improveanalyte extraction efficiencyVSAvoidanalyte contamination and loss

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The system applies different extraction protocols to different regions or types of hair samples based on their individual porosity levels, using gentler methods for highly porous damaged hair and standard methods for intact hair, thereby minimizing contamination while maintaining extraction efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system uses porosity assessment as an intermediary measurement to determine the appropriate extraction protocol, allowing indirect optimization of analyte recovery by first characterizing the hair's physical state

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables efficient and accurate determination of hair sample integrity, ensuring reliable analyte detection by distinguishing between intact and damaged hair samples, thus preventing false positives or negatives due to porosity changes caused by cosmetic treatments.

Implementation Method 1

contacting the hair sample with an aqueous solution comprising a reducing agent and a protease capable of digesting keratin

Methodology Applied

Scientific EffectReduction: Reduction

Implementation Method 2

contacting the hair sample with an aqueous solution comprising a reducing agent and a protease capable of digesting keratin

Methodology Applied

Scientific EffectEnzymatic digestion: Enzyme

Data Source

PatentEP3667325B1Integrity testing of hair samples

Publication Date: 2023.10.04 PSYCHEMEDICS CORP

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Figure 2E~3

AI summary

Methods for assessing the condition of keratinized structures, including hair, in particular methods to determine the condition of keratinized structures in relation to suitability for analysis of analytes of interest in a test sample, are presented. The methods comprise contacting the keratinized structure with a non-proteolytic reducing agent and an optional proteolytic agent. The methods further include inspection of the hair sample, or measurement of free protein eluted from the keratinized structure, after reduction and optional proteolysis to determine condition prior to analyte identification and quantitation by known techniques such as immunoassays.