Abstract: The present invention provides polymers and methods for increasing the viability of cryopreserved cells after thawing. Thawing cryopreserved cells in the presence of a polymer such as poloxymer P1 88 or other non-ionic polymers is thought to stabilize the membranes of the cells leading to increased post-thaw viability. Such methods may be used in the processing of cells and tissues for transplantation or for research purposes. Other agents such as antioxidants, vitamins, or osmotic protectants may also be added to cells to improve viability.

Abstract: The present invention provides polymers for use in preventing damage to the membranes of cells in fat grafts. Mixing of a triblock copolymer such as poloxymer P188 with adipocytes or adipose tissue to be transplanted into a subject is thought to stabilize the membranes of the cells leading to more successful fat transplantation in soft tissue reconstruction or augmentation. Such methods may also be used in the transplantation of adult stem cells or other cells derived from fat tissue. Other agents such as lipoic acid may also be added to the polymer/cell compositions for cell transplantation.