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Measurement of Cooling and Warming Rates in Vitrification-Based Plant Cryopreservation Protocols

AuthorsSchneider Teixeira, Aline; González-Benito, M. Elena; Molina García, Antonio D.
KeywordsWarming rates
Droplet vitrification
Cooling rates
Issue Date2014
PublisherAmerican Chemical Society
CitationBiotechnology Progress 30: 1174- 1184 (2014)
AbstractCryopreservation protocols include the use of additives and pretreatments aimed to reduce the probability of ice nucleation at all temperatures, mainly through micro-viscosity increase. Still, there is a risk of ice formation in the temperature region comprised between the equilibrium freezing (Tf) and the glass transition (TG) temperatures. Consequently, fast cooling and warming, especially in this region, is a must to avoid ice-derived damage. Vitrification and droplet-vitrification techniques, frequently used cryopreservation protocols based in fast cooling, were studied, alongside with the corresponding warming procedures. A very fast data acquisition system, able to read very low temperatures, down to that of liquid nitrogen, was employed. Cooling rates, measured between −20°C and −120°C, ranged from ca. 5°C s−1 to 400°C s−1, while warming rates spanned from ca. 2°C s−1 to 280°C s−1, for the different protocols and conditions studied. A wider measuring window (0°C to −150°C) produced lower rates for all cases. The cooling and warming rates were also related to the survival observed after the different procedures. Those protocols with the faster rates yielded the highest survival percentages. © 2014 American Institute of Chemical Engineers
Identifiersdoi: 10.1002/btpr.1938
issn: 8756-7938
Appears in Collections:(ICTAN) Artículos
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