Time-Temperature Indicator Using pH and Mutarotational Agents
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Solution Overview
Problem
Current time-temperature indicators lack the ability to accurately monitor the true shelf life of products by not closely paralleling the temperature dependence of quality deterioration, leading to unnecessary discarding of still usable goods due to reliance on date marking alone, and they often require complex activation processes or pose health risks.
Innovation Solution
A time-temperature indicator system comprising separate compartments with a pH modifying agent and a mutarotational reducing agent, where the agents change visual appearance upon reduction, providing a visually interpretable and irreversible response to time and temperature exposure, capable of operating within a wide temperature range without pre-usage activation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If date marking is used as the sole quality criterion, then product safety is ensured with a wide safety margin, but products which are actually still suitable for consumption are discarded
Solution Approach 1:
The patent replaces the mechanical/date-based quality assurance system with a chemical sensing system. Time-temperature indicators use chemical reactions (color changes) to detect actual storage conditions, substituting the crude mechanical approach of date marking with a sensitive chemical detection system that provides real-time quality information.
Solution Approach 2:
The patent utilizes parameter changes in chemical systems to create indicators that respond to temperature and time. The indicators employ chemical reactions whose rates change with temperature, allowing the visual appearance (color intensity) to change as a function of cumulative temperature exposure over time, providing dynamic quality assessment.
2Loss of information
If existing time-temperature indicators are used, then some monitoring capability is provided, but they lack the ability to accurately monitor true shelf life by not closely paralleling temperature dependence of quality deterioration
Solution Approach 1:
The patent employs parameter changes in chemical reaction kinetics to create indicators that accurately paralle el quality deterioration. By selecting chemical reactions with appropriate activation energies, the indicators' response rates match the temperature dependence of actual product quality loss, enabling precise shelf life monitoring across varying storage temperatures.
Solution Approach 2:
The time-temperature indicators provide continuous feedback about storage conditions through visual changes. The chemical reactions continuously monitor temperature exposure and provide real-time information about cumulative thermal stress, allowing consumers to assess actual product quality rather than relying on conservative date estimates.
3Reliability
If complex activation processes are required for time-temperature indicators, then the indicators can be made functional, but the ease of operation is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring the indicator system during manufacturing. The indicator components are prepared and positioned in advance, with activation occurring automatically upon application to the product. This eliminates the need for consumer activation steps while ensuring the indicator is ready to function immediately.
Solution Approach 2:
The time-temperature indicators are designed to be self-activating and self-monitoring. Once applied to the product, the indicators automatically begin monitoring storage conditions without requiring user intervention. The chemical reactions proceed autonomously, providing continuous quality information without needing complex activation sequences.
4Loss of information
If existing time-temperature indicators are used, then monitoring capability is provided, but health risks are posed by toxic ingredients
Solution Approach 1:
The patent selects chemical compounds and reactions based on their safety parameters as well as their sensing performance. By changing the chemical parameters (selecting specific safe compounds and reactions), the indicators achieve both accurate monitoring capability and non-toxicity, using food-safe or pharmaceutical-grade materials that pose no health risk.
Solution Approach 2:
The patent converts the potential harm of chemical toxicity into a benefit by carefully selecting chemical systems that are inherently safe. The chemical reactions that provide monitoring functionality are chosen from substances known to be safe for food and pharmaceutical applications, turning what could be a harmful aspect (chemical composition) into a beneficial feature (safe, effective monitoring).
Data Source
AI summary
The present invention relates to a time-temperature indicator system useful for monitoring the time and temperature exposure of foods, nutraceuticals, pharmaceuticals, cosmetics, chemicals and other products. The system provides improved time-temperature sensitivity and a response which better reflects that of the reactions leading to quality loss of the monitored product. Further, the invention also relates to a combination comprising said time-temperature indicator system and a product storage container. A method for producing said time-temperature indicator system is also part of the present invention.