Time--temperature indicator for perishable products based on kinetically programmable Ag overgrowth on Au nanorods

Area of Science:

• Materials Science
• Food Science
• Nanotechnology

Background:

• Food safety is a critical global concern, with product spoilage posing a significant threat.
• Temperature fluctuations during supply chain management accelerate the deterioration of perishable goods.
• Current time-temperature indicators (TTIs) face limitations in cost and programmability.

Purpose of the Study:

• To develop a cost-efficient and kinetically programmable TTI.
• To create a TTI capable of dynamically mimicking food spoilage processes.
• To enhance food quality assessment and control throughout the supply chain.

Main Methods:

• Utilized plasmonic nanocrystals to construct a novel TTI protocol.
• Demonstrated proof-of-principle for tailored TTI applications.
• Investigated the TTI's ability to dynamically track temperature history and mimic spoilage.

Main Results:

• Developed a general, programmable, and cost-effective TTI.
• Showcased the TTI's ability to dynamically mimic deteriorative processes in perishables.
• Achieved sharp-contrast multicolor changes for clear indication of product quality.

Conclusions:

• The developed plasmonic nanocrystal TTI offers a flexible and programmable solution for food safety.
• Its low cost and low toxicity enable widespread application on individual perishable items.
• This technology promises to significantly improve the tracking and assessment of perishable product quality.