Insect Fecal Pellet Age Testing via Hydrogen Peroxide Catalysis

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Solution Overview

Problem

Current methods lack a reliable and field-friendly way to determine the age of insect fecal pellets, such as those from drywood termites, which is crucial for assessing active termite infestations, as existing methods like cuticular hydrocarbon analysis require laboratory equipment and expertise not accessible to most pest management professionals.

Innovation Solution

A method involving exposure of insect fecal pellets to a hydrogen peroxide (H2O2) solution, where the presence and amount of generated oxygen indicate the age of the pellets, with accompanying kits containing reaction cartridges or tubes with H2O2 solution and colorimetric oxygen sensor compounds for easy detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If cuticular hydrocarbon analysis is used to determine pellet age, then measurement precision is improved, but device complexity and ease of operation deteriorate due to requirement for GC-MS equipment and specialized laboratory procedures

Engineering Contradiction:

Improvepellet age determination accuracyVSAvoidequipment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the essential diagnostic capability from complex GC-MS analysis by isolating a specific chemical marker (catalase enzyme) that can be detected using simple field equipment. This allows age determination without requiring sophisticated laboratory infrastructure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention employs disposable test strips or cartridges containing the catalase enzyme that can be used in the field without requiring expensive, maintainable equipment. These single-use components eliminate the need for costly GC-MS instruments while providing adequate measurement precision for pest management decisions.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If cuticular hydrocarbon analysis is used to determine pellet age, then measurement precision is improved, but ease of operation deteriorates due to requirement for specialized laboratory expertise

Engineering Contradiction:

Improvepellet age determination accuracyVSAvoidoperational simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The test system is designed to be self-contained with pre-loaded reagents and simple visual readout mechanisms. Field personnel can perform age determination independently without requiring specialized laboratory expertise, as the entire analytical process is integrated into user-friendly test components.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent utilizes colorimetric detection methods where chemical reactions produce visible color changes that indicate pellet age. This visual readout system eliminates the need for complex instrument operation and specialized expertise, allowing anyone with basic training to interpret results accurately.

Inventive Principle:

Principle #32Color changes

3Ease of operation

If simple field testing methods are developed, then ease of operation is improved, but measurement precision may deteriorate

Engineering Contradiction:

Improvefield usabilityVSAvoidage determination accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The invention changes the detection parameter from complex hydrocarbon profile analysis to a single biochemical marker (catalase enzyme presence). This parameter change enables simple field testing while maintaining sufficient precision for distinguishing fresh from old pellets, as the enzymatic activity provides a clear, quantifiable signal that correlates with pellet age.

Inventive Principle:

Principle #35Parameter changes

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 the determination of the age of insect fecal pellets in the field, providing a simple and cost-effective tool for identifying active termite infestations by measuring oxygen production, which correlates with the freshness of the pellets.

Implementation Method 1

The method involves exposing insect fecal pellets to a hydrogen peroxide (H2O2) solution, where the presence and amount of generated oxygen indicate the age of the pellets

Methodology Applied

Scientific EffectCatalase catalysis: Catalysis

Implementation Method 2

exposing the pellet material to an H2O2, or hydrogen peroxide, solution; and detecting the presence of generated oxygen

Methodology Applied

Scientific EffectHydrogen peroxide decomposition: Hydrogen Peroxide

Implementation Method 3

colorimetric oxygen sensor compounds or dyes mixed in with the H2O2 solution

Methodology Applied

Scientific EffectColorimetric detection: Photochromism

Data Source

PatentUS20240141407A1Method for testing recentness of insect fecal pellets and associated kits

Publication Date: 2024.05.02 RGT UNIV OF CALIFORNIA

AI summary

Described herein are methods for characterizing the age of an insect fecal pellet, where the method can comprise: (1) obtaining insect fecal pellet material to be tested; (2) exposing the pellet material to an H2O2 solution; and (3) detecting the presence of generated oxygen, where the amount of oxygen generated is inversely proportional to the age of the insect pellet. Also described are kits for carrying out the method.