Use of Time-Temperature Indicators as Quality Control Devices for Market Milk

Area of Science:

• Food Science
• Dairy Technology
• Quality Control

Background:

• Market milk quality relies on maintaining cold chain integrity.
• Traditional sell-by dates do not accurately reflect real-time milk quality.
• Time-temperature indicators (TTIs) offer a potential solution for real-time quality monitoring.

Purpose of the Study:

• To evaluate the efficacy of i-Point TTM and 3M Monitormark time-temperature indicators for monitoring market milk quality.
• To compare the performance of TTIs against bacterial counts and sensory acceptability of milk.
• To assess the suitability of TTIs for replacing sell-by dates on market milk.

Main Methods:

• Two TTIs, i-Point TTM and 3M Monitormark, were selected based on their specifications.
• Fresh HTST pasteurized milk was stored at 4.4°C, 6.8°C, and 10°C.
• TTIs were activated and monitored daily; milk was assessed for bacterial numbers and acceptability at intervals.

Main Results:

• i-Point TTM indicated lifespans of 10 d at 4.4°C, 8 d at 6.8°C, and 6.5 d at 10°C.
• Milk remained acceptable for approximately 4 days past the i-Point TTM lifespan at 10°C and over 10 days at 4.4°C.
• 3M Monitormark showed insensitivity within the 4-10°C temperature range.

Conclusions:

• The i-Point TTM indicator effectively monitors market milk quality and shelf-life.
• i-Point TTM provides a more accurate quality assessment than static sell-by dates.
• TTIs like i-Point TTM can enhance consumer confidence and reduce milk waste.