Plasma Freezing Quality under Action of Magnetic Field

In this study, the efficient preservation of fresh frozen plasma was investigated. Improving the quick freezing efficiency was achieved by adding a magnetic field to assist the freezing process. The changes in plasma ice crystal structure and size in the quick-freezing experiment under a magnetic field of 0–100 Gs were analyzed. Considering magnetic field-assisted quick-freezing accelerates the mass and heat transfer rate, the growth rate of ice crystals is faster than the speed of water migration, resulting in changes in the shape and distribution of the ice crystals. Therefore, small, round, and uniform ice crystals were formed in the plasma, which reduced the damage to the structure of the plasma by the ice crystals and thus improved the quality. The plasma coagulation factor Ⅷ content in the quick-freezing experiment under 0–100 Gs magnetic field intensity was reduced by different amounts depending on the magnetic field intensity when compared with that for fresh frozen plasma. The maximum reduction of 3.56% occurred at a magnetic field of 20 Gs. The active concentration under magnetic fields of 60 Gs and 80 Gs were higher than those atother field strengths, and the plasma quality effect after quick-freezing storage was better.