Abstract
Cryopreservation has been a key technology in medical science, food preservation, and many other fields. In a freezing process, the formation of ice crystals may cause significant damage to the frozen samples. In order to reduce the damage, many cryoprotectants (CPAs) have been developed and added in cryopreservation processes for reduced ice volume, decreased ice size, proper ice shaping, and cell protection. According to the material characteristics, the CPAs are either impermeable (i.e., antifreeze protein, polyampholytes, and polyvinyl alcohol) or permeable (i.e., dimethyl sulfoxide, proline, and glycerol) to cell membranes. The typical CPAs are introduced in this work with their material characteristics, antifreeze mechanisms, and applications. Antifreeze mechanisms for different CPAs involve molecular adsorption on the ice surface, hydrogen bonding to ice, bending the ice surface, lowering the freezing point, inhibiting ice recrystallization, protecting cell membranes, reducing dehydration of cells, and breaking hydrogen bonds among ice crystals to reduce the size of ice crystals. In practice, different CPAs can be used together with their cryopreservation properties functioning synergetically. This study reviews the recent applications of CPAs in food, biology and medicine, and agriculture. Future works for CPAs are suggested in improving efficiency, revealing mechanisms, broadening application, and finding new CPAs.
Highlights
In recent years, the demand for cryopreservation has been increasingly high in food, biology, medicine, and many other fields [1,2,3]
The results showed that the polymer containing 4% ethyl methacrylate (HEMA) had the highest cell recovery, while the polymer containing 10% cyclohexyl methacrylate (CyMA) had the lowest cell recovery
The results showed that antifreeze proteins (AFPs) significantly improved the freshness of these vegetables after thawing
Summary
The demand for cryopreservation has been increasingly high in food, biology, medicine, and many other fields [1,2,3]. Large ice crystals formed by ice recrystallization can cause severe, even fatal, mechanical injury to cells [7]. These two kinds of injuries restrict the development of cryopreservation. Impermeable CPAs include AFPs, polyvinyl alcohol (PVA) [15], polyampholytes [16], graphene oxide [17], and so forth These types of CPAs work outside the cells, structuring the ice shapes to lower the lowtemperature damage. The representative and popular CPAs of these two types (permeable and impermeable) are selected Based on current findings and discussion, future directions in cryopreservation are proposed
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