studies regarding the crioprotective proprieties of the vitrification media, with ethylene glycol, sucrose, ficoll 70 and galactose used in mammalian embryo cryopreservation
Clics: 319
ID: 251051
2009
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Résumé
Crioprotectors are the main component of any vitrification media. The penetrant crioprotectors areessential for cell dehydration and for the decrease of the freezing point of the solution, allowing a longertime for dehydration to set in. The aim of our paper was to make a series of experiments in order todetermine the concentration at which four cryoprotectants (ethylene glycol, sucrose, Ficoll 70 andgalactose) singly and in pairs would vitrify on plunging into liquid nitrogen and remain vitreous whenthawed in water bath. A total of 156 solutions were tested. During freezing, vitrification was evidenced bythe formation of transparent glass when the unsealed straws were plunged into liquid nitrogen, at -196°C. Crystallization (ice formation) resulted in a milky appearance. Solutions that vitrify on freezingwere tested if they remain vitreous on thawing. For thawing we tested three temperatures 20°C, 25°C and37°C. During thawing, solutions that did not devitrified were transformed from solid clear state to theliquid state without evidence of a milky appearance. From the combinations of two cryoprotectors weretested a number of 51 solutions vitrify on freezing (19 solutions with ethylene glycol and galactose; 19solutions with ethylene glycol and sucrose; 13 solutions with ethylene glycol and Ficoll). The ethyleneglycol and galacose pair give the best results on thawing (3 combinations remained vitreous on thawing)at 37°C.
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| Auteurs | ;ALEXANDRA BOLEMAN;N. PĂCALĂ;ADA CEAN |
| Revue | Enzyme and microbial technology |
| Année | 2009 |
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