Effects of the Improvement of Vitrification Solution and FDA-test on the Embryo Survival and Conception Rate by Ultrarapid Freezing II. Effects of the Addition Level of Non-permeable Cryoprotectants (Ficoll, sucrose) in Vitrification Solution and Equilibration Time on the Survival of Vitrofied Mouse Embryos

초급속동결에 있어서 Vitrification Solution 개발과 FDA 생사판정이 수정란의 배양과 이식후 착상에 미치는 영향 II. Vitrification Solution내의 비수과성 물질(Ficoll, sucrose)과 평형시각이 초급속동결 융해후 Mouse Morulae의 생존율에 미치는 영향

This study was carried out to study effects of the addition level of acetamide and non-permeable cryoprotectants(Ficoll, sucrose) in VS(20% glycerol＋10% ethyleneglycol) and equilibration time on the survival of vitrified mouse morulae. The results are summarized as follows: 1. When 10, 15 and 20% of acetamide were added to the new vitrification solution(20G 10E), FDA-scores of embryos were 4.4(control), 4.4(10%), 3.6(15, 20%), respectively. The addition of acetamide did not affect the survival of forzen-thawed morulae(P<0.05). 2. The survival rate betwen 5 min(3.5) and 10 min(4.6), 10 min(4.6) and 20 min(3.2) of equilibration in 10% sucrose, and 20 min(3.2) and 5 min(4.0), or 10 min(4.3) in 20% sucrose were significantly different(P<0.05). The highest survival(4.6) rate was obtained in mouse morulae equilibrated in VS(20G 10E) containing 10% sucrose for 10 minutes. 3. FDA-score of morulae frozen in the new vitrification solution containing 0, 10, 20 and 30% Ficoll was 4.5, 4.2, 4.4 and 4.6, respectively and had no significant effect among concentrations of Ficoll(P>0.05). The development rate after culture(24h) was 89%(20% Ficoll) and 93%(30% Ficoll), respectively.