Hydrogels in solutions can reversibly swell and collapse with small changes in the process conditions. In this paper we focus on using this characteristic as a purification device. The gels prove to be effective and gentle substitutes for ultrafiltration membranes for the purification of sensitive products such as biomaterials.
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Acknowledgements This work was partially supported by the National Science Foundation (grant CBT 86-11646) and by the Hoechst Celanese Corporation.