A cryopreservation medium is a specialized solution formulated to protect cells, tissues, and other biological materials from damage during freezing, ultralow-temperature storage, and thawing. The medium serves multiple critical functions: it reduces or prevents lethal intracellular ice formation, moderates osmotic stress during the freeze–thaw cycle, and maintains cellular integrity and function upon recovery. Cryopreservation media are indispensable across basic research, biobanking, cell therapy manufacturing, and reproductive medicine.
Applications
Cryopreservation media are employed across a broad spectrum of biological and clinical applications.
Cell therapy manufacturing. Cryopreservation is central to the manufacturing of CAR-T cells, mesenchymal stem cells (MSCs), and other advanced therapy medicinal products. Traditional formulations use 5–10% DMSO with human serum albumin or serum, while serum-free and animal-origin-free alternatives are increasingly preferred for regulatory compliance. A DMSO-free formulation using 10% glycerol and 2% betaine has been developed for T-cell preservation in cell therapy-relevant workflows.
Biobanking. Cryopreservation media enable the long-term storage of cells, tissues, and biological samples in biorepositories.
Stem cell research. Human pluripotent stem cells, including embryonic stem cells and induced pluripotent stem cells, are cryopreserved in defined, xeno-free media. Conventional methods use 10% DMSO with a slow cooling rate of 1°C per minute. Chemically defined formulations such as PSC Cryopreservation Medium are available for pluripotent stem cell applications.
Reproductive medicine. Cryopreservation media are essential for the preservation of sperm, oocytes, and embryos. Sucrose at 0.2–0.3 M is widely used as a cryoprotective agent (CPA) in media for human oocytes, improving post-thaw recovery. Vitrification protocols employ higher CPA concentrations for oocyte and embryo preservation.
Tissue banking. Cryopreservation media support the preservation of cartilage, bone, skin, and other tissues for transplantation and research. Tissue cryopreservation is more complex than cell cryopreservation due to diffusion barriers and heterogeneous cell populations.
