FAEE and EtG Hair Analysis for Alcohol Consumption Detection
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Solution Overview
Problem
Current alcohol testing methods are inadequate for accurately assessing long-term alcohol consumption, as they often provide late or false results, and do not directly quantify alcohol intake, making them ineffective for early-stage alcohol abuse detection and preventive treatment.
Innovation Solution
A method analyzing fatty acid ethyl esters (FAEEs) and ethyl glucuronide (EtG) in hair, nails, or skin secretions, using deuterised internal standards for precise identification, which provides a reliable historical assessment of alcohol consumption by comparing marker levels to control data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liver function tests are used to detect alcohol abuse, then medical conditions can be identified, but the results are obtained too late for preventive treatment and may produce false results
Solution Approach 1:
The patent measures FAEE and EtG markers in hair, nails, or skin secretions to detect alcohol consumption before liver damage occurs. This preliminary detection approach allows identification of alcohol abuse in early stages, enabling preventive treatment before the liver function deteriorates to a point where traditional liver function tests become necessary but too late for effective prevention.
2Productivity
If breath alcohol tests are used, then current intoxication can be detected, but the test is not reliable more than a few hours after the last drinking session
Solution Approach 1:
The patent measures not only current alcohol presence but also historical alcohol consumption patterns by analyzing accumulated FAEE and EtG markers in hair, nails, or skin secretions. This partial measurement approach (measuring multiple time points through different sample types) provides both immediate and historical consumption data, ensuring reliable assessment regardless of when the test is conducted relative to the last drinking session.
3Reliability
If CDT marker is used to detect alcohol dependence, then alcohol dependence can be identified, but the test cannot detect intermittent relapses or irregular consumption patterns
Solution Approach 1:
The patent segments the analysis into multiple independent marker measurements (FAEE and EtG) from the same sample source, allowing detection of different consumption patterns. By analyzing both markers simultaneously and comparing their ratios, the method can distinguish between regular heavy consumption, intermittent relapses, and irregular consumption patterns, providing versatile detection capability across different alcohol abuse scenarios.
4Measurement precision
If alcohol tests are conducted to ensure accuracy, then reliable results can be obtained, but contamination from alcohol-derived substances such as shampoos, hair dye or medication may cause false positives
Solution Approach 1:
The patent uses deuterated internal standards as intermediaries in the analysis process. These deuterated FAEE and EtG standards are added to samples before extraction and analysis, serving as reference points that allow accurate quantification of the endogenous markers. The deuterated standards distinguish true metabolic products from external contamination, enabling precise measurement while eliminating false positives from alcohol-derived substances in shampoos, hair dyes, or medications.
Data Source
AI summary
An analysis method consisting of the accurate determination of human fatty acid ethyl esters in hair, skin secretions and/or skin patches, toenails and fingernails by extraction and determination by gas chromatography/mass spectrometry or liquid chromatography/mass spectrometry to determine fatty acid ethyl esters (FAEE's) amongst others the concentrations of ethyl myristate, ethyl palmitate, ethyl oleate compared with deuterised internal standards which allow accurate quantification of these species, in conjunction with the determination of ethyl glucuronide (EtG) to show that the alcohol has been metabolized and is not from contamination with alcohol and comparison of individual levels of FAEE's with real-life data from alcohol consumers, and comparison of the cumulative sum of FAEE's with real-life data from alcohol consumers to give a reliable comparison to the amount of alcohol that has been consumed, whether overall or month by month or such other historical period as may be required from the sample.