Comparison between different freezing and thawing methods for human spermatozoa
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Preservation of cells and tissues by freezing at temperatures below 70°C has led to new possibilities for the storage of germ cells for fertility preservation. During the freezing process problems might occur, the greatest being ice crystallization which can cause membrane destruction and thus cell death. To minimize this risk, solutions that reduce the freezing point can be added to reduce crystallization and increase survival rates. These solutions are called cryoprotectants. The best method for freezing is still not known.The aim of this study was to analyze the effect of various parameters on the survival rate of human semen frozen with liquid nitrogen. The parameters investigated were thawing method (incubator or water bath) and container choice (straw or ampoule). In addition, two different cryoprotectants were tested.The method used was the instruction for preservation with Sperm CryoProtec™ II from Nidacon. In total 16 samples were collected for the first test and 13 samples for the second test. Sperm concentration and motility was measured.There seem to be no significant differences depending on container choice or thawing method leading to the conclusion that the most cost effective method of storage and thawing may be used. A small but significant difference was found in survival after thawing dependent on cryoprotectant p=0.041. However the study sample was limited and further studies might be of value.
Place, publisher, year, edition, pages
2011. , 14 p.
cryopreservation, sperm, ice crystallization, gradient wash, ampoule
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-158842OAI: oai:DiVA.org:uu-158842DiVA: diva2:441666
Stavreus Evers, Anneli