Biporous hypercrosslinked polystyrene

As can be seen, aU adsorbing materials unfortunately partially remove the target product, riboxin, together with the contaminating colored bodies. However, commercial MN-200 and biporous Styrosorb display the most beneficial ratio of the above two components. Besides, a crucial advantage of hypercrosslinked polystyrene is exhibited in the ease of its... 

On the other hand, really large organic molecules may prove to be totally excluded from microporous hypercrosslinked polystyrene sorbents if they were prepared from gel-type copolymer precursors. In these cases, only biporous sorbents can compete with the macroporous AmberHte XAD-4. 

It is appropriate to emphasize here that aU hypercrosshnked polystyrene products designed for use in columns, both analytical and industrial, are prepared in such a special manner that their bead size remains nearly constant in any liquid media. Most variants of the sorbents are ofbiporous morphology. The size constancy of their beads is essential for avoiding column blocking or channeling. This property, however, does not mean that the hypercrosslinked polymer phase of a biporous product does not feel the nature of the microenvironment and does not change its volume at the expense of the volume of macropores. 

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