Dual-Reagent Pad for Simultaneous Amine and Thiol Detection

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Solution Overview

Problem

There is a need for an apparatus capable of simultaneously detecting amines and thiols, as these compounds are produced in increasing abundance during pathophysiological and environmental processes, and existing methods are inadequate for monitoring their progress effectively.

Innovation Solution

The apparatus employs phthaldialdehyde (OPA) and 5,5'-dithiobis(2-nitrobenzoic acid) (DTNB) reagents immobilized on a pad matrix, which react with amines and thiols to produce fluorescent or colored derivatives, allowing for spectrophotometric detection, and can be used in test strips with color charts for diagnostic purposes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate detection methods are used for amines and thiols, then each compound can be detected with dedicated reagents, but the apparatus cannot simultaneously monitor both compounds in the same sample

Engineering Contradiction:

Improvesimultaneous detection capabilityVSAvoiddetection system structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines OPA and DTNB reagents on a single pad matrix, allowing simultaneous detection of amines and thiols in one test. The pad contains both reagents in appropriate concentrations and formulations, enabling one-sample dual-detection without requiring separate test strips or complex multi-step procedures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pad matrix serves multiple functions: it simultaneously detects both amines and thiols, provides visual color changes for both compound types, and can be used with various sample types (urine, saliva, cerebrospinal fluid). This multi-functional design eliminates the need for separate specialized detectors for each compound.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If OPA reagent is used for amine detection, then fluorescent derivatives are produced, but the reagent forms brown/gray adducts when hydrated with oral fluid samples without added thiol

Engineering Contradiction:

Improveamine detection accuracyVSAvoidfalse color interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

DTNB acts as an intermediary reagent that specifically detects thiols and produces yellow color. When both OPA and DTNB are present on the pad, the thiol component of the sample reacts with DTNB to produce yellow color, while the amine component reacts with OPA to produce fluorescent derivatives. This intermediary approach allows the system to distinguish between amine-only samples (brown/gray) and samples containing thiols (yellow), preventing false color interference in amine detection.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If multiple separate test strips are used to detect amines and thiols, then each compound can be detected with appropriate reagents, but the procedure becomes time-consuming and requires multiple sample applications

Engineering Contradiction:

Improvedetection throughputVSAvoidtesting time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent merges OPA and DTNB reagents onto a single pad matrix, allowing both amine and thiol detection in one sample application. The pad is designed with appropriate porosity and reagent distribution to enable simultaneous reactions, reducing testing time from multiple sequential applications to a single dual-detection step.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pad matrix is pre-formulated with both OPA and DTNB reagents in optimized concentrations and formulations during manufacturing. This preliminary preparation eliminates the need for users to prepare separate reagent systems or perform multiple sequential tests, as both detection capabilities are already integrated and ready for immediate use with a single sample application.

Inventive Principle:

Principle #10Preliminary action

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

The apparatus enables simultaneous detection of amines and thiols in bodily fluids, providing a diagnostic tool for conditions like periodontal disease, with visible color changes indicating the presence and concentration of these compounds, facilitating monitoring of their levels and changes over time.

Implementation Method 1

Under certain reaction conditions, the derivatized amine compounds produced are fluorescent, and can be detected spectrophotometrically, for example, with excitation at 340 nm and emission at 455 nm.

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Implementation Method 2

It combines with active thiols of numerous types, giving as one of the products a thiolate anion, which exhibits a very high extinction coefficient at ̃412 nm.

Methodology Applied

Scientific EffectAbsorption Spectroscopy: Absorption Spectroscopy