CEREX Polycrom CEREX Polycrom SPE columns are produced from a family of polymeric sorbents. These sorbents are divided into two classes, namely, (1) co-polymeric and (2) functionalized polymers.
Co-polymers are the result of polymerizing two monomers, such as styrene and divinylbenzene. By choosing different monomers, the polarity of the resulting co-polymer can be varied thereby providing a polarity spectrum of sorbents, particularly useful for solid phase extraction applications.
Polycrom functionalized sorbents are modified, highly cross-linked divinylbenzene polymers. These modifications afford extraordinary properties when used for solid phase extraction. For example, functionalizing DVB with a quaternarized amine produces a strong anion exchanger. This ion exchanger will perform in mixed mode, a strong anion exchanger coupled to the hydrophobic interaction provided by the divinylbenzene backbone.
The CERA Polycrom sorbents are offered in SPE columns in the patented CEREX format*. Microparticulate sorbents are contained within a borosilicate retainer system which assures uniform fluid transmission through the sorbent bed. Sorbent particle size is approximately 10-15M. Capacity is, therefore, three to four times 40-50M sorbents used in conventional SPE columns. As a result, sorbent bed depth is smaller and this affords minimum solvent usage which is especially significant at the elution step, learn more about SPE Columns.
*U. S. Patent Number 5,595,653.
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