The effect of the pH value and temperature of pyrrolidone on the PVP aqueous solution plays a role in cell preservation. Proper operation and proper freezing conditions can reduce the change or loss of cell characteristics. The uncrosslinked PVP solution has no special thixotropy, unless the concentration is high, it will have thixotropy and show a short relaxation time. Cell cryopreservation experience: choosing the right cryopreservation tool is the king. Cell cryopreservation is a technology that stores cells in a low-temperature environment to reduce cell metabolism and achieve long-term storage. (Pyrrolidone) In most cell lines, the thickening performance of PVP is closely related to its relative molecular mass. Under a given concentration, the greater the relative molecular mass, the greater its viscosity. Cells will continue to accumulate and change with aging and evolution, causing phenotype and genotype "culture drift". Correct and successful cryopreservation plays an important role in the long-term application of cells.
During the cryopreservation process, therefore, proper culture and gentle cell collection. Before cryopreservation, the cells should maintain a good growth state (in log phase or exponential phase). Ideally, the medium should be 24h before harvest replace. It is recommended to carry out microbial contamination of the culture, especially mycoplasma, to ensure that the cells are not contaminated. In the cell collection process, the experimental operation should be as gentle as possible to avoid cell damage. (Pyrrolidone) Appropriate cryoprotectant. At present, the commonly used technique for cell cryopreservation is liquid nitrogen cryopreservation. The slow freezing method with an appropriate amount of protective agent is mainly used to freeze the cells to reduce the damage to the cells during the freezing process. If the cells are frozen directly without adding protective agents, the water inside and outside the cells will quickly form ice crystals, which will cause a series of adverse reactions.
Polyvinylpyrrolidone, ethylene glycol, methanol and methylacetamide are all cryoprotectants. Commonly used in cell cryopreservation are dimethyl sulfoxide (DMSO) and glycerol. These two substances have small molecular weight, high solubility, and can easily penetrate cells. They can lower the freezing point and improve the permeability of cell membranes to water. For cellularity. (Pyrrolidone) DMSO usually has a concentration of 5-10% (v/v), and the optimal concentration varies with cell lines. The final concentration of glycerol in the freezing medium is 5-15%. Again, the optimal concentration depends on the cell line. In order to improve the survival rate of cells that are more difficult to preserve, you can choose to increase the serum concentration in the preservation solution during cryopreservation. If you want to freeze cells faster and more stable, cell cryopreservation fluid is a good choice. There is no need to prepare, just add an appropriate amount of cryopreservation fluid directly to the cells. The operation is simple and you can have high viability cells.