Effect of Various Freezing Parameters on the Immediate Post‐Thaw Membrane Integrity of Adipose Tissue Derived Adult Stem Cells

The effect of four thermal parameters on post‐thaw membrane integrity of adipose tissue derived adult stem (ADAS) cells after controlled‐rate freezing was investigated with the help of a two‐level four‐parameter (24) experimental design. The four thermal parameters studied were cooling rate (CR), end temperature (ET), hold time (HT), and thawing rate (TR). Several passages, including Passage‐0 (P0), Passage‐1 (P1), Passage‐2 (P2), Passage‐3 (P3), and Passage‐4 (P4), obtained from the suspended culture of stromal vascular fraction (SVF) of the ADAS cells were used for this study. The two levels (low and high) of the four parameters [CR (1 and 40 °C/min); ET (–80 and –20 °C); HT (1 and 15 min); and TR (10 and 200 °C/min)] are chosen in such a way that they enclosed all parameter values possible using commercially available controlled‐rate freezing equipment. Individual effect of each parameter on the immediate post‐thaw membrane integrity was determined through the calculation of parameter effect values (E), and any synergy among the parameters on post‐thaw membrane integrity was assessed through the calculation of two or more parameter interaction effect values (I). Nonlinearity in the experimental results was represented through the calculation of curvature value (CV). The results suggest that for 99% confidence level the parameters CR and ET have considerable effect on post‐thaw membrane integrity of all passages of ADAS cells. A significant individual effect of TR was observed with P3 and P4 cells and a significant two‐parameter interaction was observed between CR‐ET for all passages. These observed results will be used as a basis to further develop freezing storage protocols of ADAS cells.

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