Antioxidant Activity Measurement via Electrical Conductivity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing spectrophotometric methods for measuring antioxidant activity are limited by their inability to assess both hydrophilic and lipophilic solutions simultaneously, often requiring complex sample preparation and potentially inaccurate results due to the use of target substances that interfere with measurements.

Innovation Solution

A method involving the measurement and comparison of electrical conductivity and pH values between a solution with a free radical-producing substance and the same solution with an additional substance whose antioxidant activity is being evaluated, allowing for the calculation of a mathematical relationship to assess antioxidant activity without the need for a target substance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If spectrophotometric methods are used to measure antioxidant activity, then measurement can be performed, but the method can only examine either hydrophilic or lipophilic solutions separately, requiring complex sample preparation and yielding incomplete results

Engineering Contradiction:

Improveability to measure both hydrophilic and lipophilic antioxidant activityVSAvoidsample preparation complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the optical measurement system (spectrophotometer) with an electrical measurement system (conductivity meter). This substitution allows the use of a single measurement device that can handle both hydrophilic and lipophilic solutions without requiring separate preparation protocols, thereby resolving the contradiction between measurement versatility and preparation complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a universal measurement approach using electrical conductivity that works for both hydrophilic and lipophilic phases simultaneously. The conductivity measurement method is applicable to clear and opaque solutions alike, eliminating the need for separate hydrophilic and lipophilic measurements and their associated preparation steps

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If target substances are used in antioxidant activity measurement, then the measurement can be performed, but the target substance interferes with the measurement and prevents direct evaluation of antioxidant activity

Engineering Contradiction:

Improveaccuracy of antioxidant activity evaluationVSAvoidinterference from target substance

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent completely removes the target substance from the measurement system. Instead of using a target substance that gets oxidized and requires interpretation, the method directly measures the electrical conductivity of the solution containing the antioxidant substance and free radicals. This extraction of the target substance eliminates its interfering effects and enables direct evaluation of antioxidant activity without intermediate correlations

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The antioxidant substance itself serves as the measurement subject rather than requiring a separate target substance. The electrical conductivity measurement directly reflects the interaction between the antioxidant substance and free radicals, allowing the substance to 'self-report' its antioxidant activity through its effect on the electrical properties of the solution

Inventive Principle:

Principle #25Self-service

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 enables a direct and accurate evaluation of antioxidant activity, unaffected by interactions with target substances, and allows for the creation of an antioxidant activity scale for different substances, regardless of their lipophilic or hydrophilic nature.

Implementation Method 1

an active substance in the production of free radicals... an active substance in the production of free radicals

Methodology Applied

Scientific EffectFree radical generation through thermal decomposition: Decomposition (biological)

Implementation Method 2

the antioxidant activity of a substance... the antioxidant ability of a substance

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

measuring and comparing the electrical conductivity... detecting a first electrical conductivity value and a second electrical conductivity value

Methodology Applied

Scientific EffectElectrical conduction through ionic species: Conduction (electrical)

Data Source

PatentEP4394369B1Method for measuring the antioxidant activity of a substance or a mixture of substances

Publication Date: 2025.06.18 B T S SRL

Figure 1
Figure 2

AI summary

A method for evaluating the antioxidant activity of a substance or a mixture of substances, comprising a step of measuring and comparing the electrical conductivity comprising the operations of: - detecting a first electrical conductivity value and a first pH value of a first solution comprising a solvent and an active substance in the production of free radicals; - detecting a second electrical conductivity value and a second pH value of a second solution comprising the solvent, the active substance in the production of free radicals and a substance whose antioxidant activity is to be evaluated; - calculating a mathematical relationship between the first electrical conductivity value and the second electrical conductivity value. The first solution and the second solution have the same temperature, the same volume of solvent, the same composition of solvent and the same concentration of active substance in the production of free radicals.