Crystallization Properties of Oocytes Encapsulated in Sodium Alginate Hydrogel

Lin Chunyan; Zhang Yuqi; Zhou Xinli

doi:10.12465/j.issn.0253-4339.2025.01.157

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Crystallization Properties of Oocytes Encapsulated in Sodium Alginate Hydrogel

更新时间：2025-01-23

- Crystallization Properties of Oocytes Encapsulated in Sodium Alginate Hydrogel
- Journal of Refrigeration Vol. 46, Issue 1, Pages: 157-166(2025)
- 作者机构：
  
  上海理工大学生物系统热科学研究所　上海　 200093
- 作者简介：
  
  Zhou Xinli, female, professor, Institute of Biothermal Technology, University of Shanghai for Science and Technology, 86-13817547878，E-mail: zjulily@163.com. Research fields: cryobiology.
- 基金信息：
- DOI：10.12465/j.issn.0253-4339.2025.01.157
  CLC： TB61⁺1;R318.52
- Received：25 October 2023，
  
  Revised：25 November 2023，
  
  Accepted：2024-01-18，
  
  Published：16 February 2025
- 稿件说明：
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Lin Chunyan, Zhang Yuqi, Zhou Xinli. Crystallization Properties of Oocytes Encapsulated in Sodium Alginate Hydrogel[J]. Journal of refrigeration, 2025, 46(1): 157-166.
DOI：

Lin Chunyan, Zhang Yuqi, Zhou Xinli. Crystallization Properties of Oocytes Encapsulated in Sodium Alginate Hydrogel[J]. Journal of refrigeration, 2025, 46(1): 157-166. DOI： 10.12465/j.issn.0253-4339.2025.01.157.

摘要

基于海藻酸钠水凝胶的微囊化技术可用于优化冷冻和复温程序，降低细胞和组织的冷冻损伤。观察了卵母细胞在不同体积分数（0.5%、1.0%、1.5%、2.0%）海藻酸钠水凝胶中的形态，确定其封装的安全浓度；利用低温显微镜系统研究了不同体积分数海藻酸钠水凝胶的结晶温度及结晶行为，并对比卵母细胞在基础溶液、保护剂溶液中降/复温时形态和结晶情况；对比溶剂置换型和物理混合型制备的海藻酸钠抗冻水凝胶包封卵母细胞的冻存效果。结果表明：卵母细胞在0.5%和1.0%体积分数的海藻酸钠凝胶中整体形态与体积维持较好；1.0%体积分数海藻酸钠组和12.5%DMSO+12.5%EG+0.5 mol/L海藻糖的保护剂溶液组中的卵母细胞在降温过程中均未产生胞内冰；相比物理混合型，溶剂置换型组水凝胶中的卵母细胞在降温过程中无胞内冰产生，细胞复温后仍保持正常形态。

Abstract

Microencapsulation technology based on sodium alginate hydrogels can be used to optimize freezing and rewarming procedures and to reduce cryo-damage to cells and tissues. This study first observed the morphology of oocytes of sodium alginate hydrogels at different volume fractions (0.5%

1.0%

1.5%

and 2.0%) to determine the safe concentration for their encapsulation. Second

the crystallization temperature and crystallization behavior of sodium alginate hydrogels with different volume fractions were systematically investigated using cryo-microscopy

and the morphology and crystallization of oocytes were compared when they were cooled down/retempered in the base solution (cryoprotectant solution). Finally

the freezing effects of the sodium alginate antifreeze hydrogel-encapsulated oocytes prepared by solvent replacement and physical mixing were compared. The results revealed that oocytes maintained their overall morphology and volume better in sodium alginate gels at volume fractions of 0.5% and 1.0%. Furthermore

oocytes in both the 1.0% sodium alginate group and the cryoprotectant solution group of 12.5% DMSO + 12.5% EG + 0.5 mol/L trehalose did not produce intracellular ice during the cooling process. Additionally

compared with the physical mixture

oocytes in the hydrogel solvent replacement group did not produce intracellular ice during the cooling process

and the cells retained their normal morphology after rewarming.

关键词

Keywords

references

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上海理工大学生物系统热科学研究所

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