Research Progress of Molecular Imprinting Cryogel
Cryogel is a kind of elastic,spongy hydrogel prepared via addition polymerization from monomers or cross-linking reaction from a polymer at a temperature lower than the freezing point of the solvent. Cryogel has been principally used in molecular imprinting cryogel based solid phase extraction in the field of analytical chemistry,which combines both the advantages of high selectivity of the molecular imprinting and the porous structure,high throughput of a cryogel. Molecular imprinting cryogel can be used as the stationary phase in a packed column,a monolith column,or the adsorbent in a separation membrane. A variety of molecules can act as template molecules,including small molecules,macromolecules,a certain fragment of a macromolecule,and even an inorganic ion. Both a simple template and a complex template can be used. When employing more than a molecule( or an ion) as templates simultaneously,the method is termed as Mixed template. While high abundance components of a complex sample act directly as mixed template,we name the method as Pending template. Further,while an analogue,an isotopic label,or a fragment of the target substance acts as a template,the method is defined as Dummy template. However,the research on cryogel is insufficient and the application of the cryogel is narrow hitherto.