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Kinetically Tunable, Subzero-Active, Visual Time-Temperature Indicators Based on the Permanganate-Oxalate Reaction.

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Summary
This summary is machine-generated.

New visual time-temperature indicators (TTIs) utilize a permanganate-oxalate reaction with antifreeze salts for ultracold storage. These customizable indicators ensure the integrity of biologicals and biospecimens during ultra-low temperature handling and monitoring.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Biotechnology

Background:

  • Biological products and specimens require consistent ultracold storage to maintain integrity.
  • Existing time-temperature indicators (TTIs) are insufficient for monitoring ultracold conditions at the individual aliquot level.

Purpose of the Study:

  • To develop novel visual time-temperature indicators (TTIs) functional below 0 °C for ultracold storage.
  • To adapt the permanganate-oxalate reaction using eutectic perchlorate-based antifreeze solutions for customizable kinetics and robust performance.

Main Methods:

  • Adapted the autocatalytic permanganate-oxalate reaction with eutectic compositions of LiClO4, NaClO4, and Mg(ClO4)2 to depress melting points to -18 °C, -37 °C, and -67 °C.
  • Characterized eight customized TTIs with run times ranging from five minutes at 25 °C to 7 days at -20 °C.
  • Assessed temperature sensitivity, accuracy, reproducibility, and stability under freeze/thaw cycles and extended pre-freezing periods.

Main Results:

  • Developed ultracold-active TTIs with customizable kinetics and temperature sensitivity consistent with Arrhenius behavior.
  • Achieved high accuracy and reproducibility with within-batch and between-batch run-time precision ≤ 4.8% CV and ≤ 7.5% CV, respectively.
  • Demonstrated indicator stability, maintaining color intensity for at least 12 months when stored below melting points, with minimal impact from freeze/thaw cycles.

Conclusions:

  • The permanganate-oxalate system in eutectic perchlorate-based antifreeze solutions provides a simple, inexpensive approach for ultracold-active TTIs.
  • These TTIs offer customizable kinetics and robust performance for monitoring ultracold conditions.
  • The developed TTIs can significantly improve the quality monitoring of biologicals and biospecimens during ultracold storage and handling.