Hydrogel Time-Temperature Indicator Using Food Coloring and Alkalinizing Agent
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Solution Overview
Problem
Current time-temperature indicators (TTIs) face challenges such as high costs, toxicity of materials, and inaccuracies in response reliability, limiting their effectiveness in monitoring the shelf life and thermal history of perishable products.
Innovation Solution
A visual time-temperature indicator comprising two hydrogel elements, one with an alkalinizing agent and the other with food coloring, which change color irreversibly when the temperature threshold is exceeded, allowing for reliable monitoring of temperature changes in perishable products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TTIs use complex materials (e.g., silver nanoparticles, specialized gels), then measurement precision improves, but cost increases and toxicity problems arise
Solution Approach 1:
The patent uses inexpensive, non-toxic materials (sugar, gelatin, food coloring) that can be safely disposed of after use, eliminating the need for expensive, toxic materials like silver nanoparticles while maintaining adequate functionality for single-use TTI applications
Solution Approach 2:
The patent changes the chemical parameters of the indicator system by using sugar-based chemistry (caramelization, Maillard reaction) instead of metal nanoparticle chemistry, achieving comparable measurement precision through different chemical mechanisms that are non-toxic
2Measurement precision
If conventional TTIs use expensive materials and complex manufacturing, then measurement precision improves, but productivity decreases
Solution Approach 1:
The patent employs low-cost materials (sugar, gelatin, food coloring) that can be manufactured through simple processes, dramatically reducing the cost per individual TTI unit while maintaining sufficient measurement precision for food safety applications
Solution Approach 2:
The patent simplifies manufacturing parameters by using aqueous solutions and simple heating processes instead of complex nanoparticle synthesis and dispersion techniques, enabling high-volume production at low cost
3Device complexity
If TTIs monitor only specific thresholds (partial TTI), then device complexity decreases, but loss of information increases
Solution Approach 1:
The patent uses progressive color changes in the sugar-based indicator system that reflect cumulative thermal exposure, providing continuous information about thermal history rather than simple threshold alerts, while maintaining relatively simple device architecture
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 proposed TTI provides a cost-effective, non-toxic, and reliable means to monitor temperature changes, enabling the detection of thermal abuses and ensuring food safety by 'recording' the thermal history of products.
Implementation Method 1
TTIs of a physical type exploit a diffusion process in a dyed solution containing an ester within a porous matrix; in this case activation of the process is triggered when a specific temperature is exceeded
Implementation Method 2
A visual time-temperature indicator which comprises a first and a second element, each comprising a hydrogel, wherein said first and second elements are at least partially in contact with each other
Data Source
AI summary
The present invention relates to a visual time-temperature indicator which comprises a first and a second element each comprising a hydrogel, wherein said first element further comprises at least one alkalinizing agent, and said second element comprising further at least one food colouring.