Author Archives: Michael Wang

Zeta Plus™ VR Filters for Viral Reduction

          The FDA requires a minimum of two viral clearance steps operating by different mechanisms to provide assurance of viral clearance. To be considered robust, a viral clearance step must be validated to consistently remove model viruses with at least 2 logs of clearance. When filtration is used, the objective is to obtain effective viral clearance without causing protein (product) loss. 3M Purification Inc. Zeta Plus™ VR Series filters can be used upstream in cell culture…

DNA Removal By Depth Filters in Bioprocesses

  Conclusion   The removal of DNA from cell culture broths and lysates may be required to accomplish the CBER-recommended concentration of DNA impurity of About the Author Author Details Michael Wang, PhD, is a Marketing Manager Bioprocess at 3M Purification Inc., 400 Research Parkway Meriden, CT 06450-1018; 203- 238-8795; Mwang9@mmm.com. REFERENCES 1.) Dorsey, J. 1997. The Role of Charge in the Retention of DNA By Charged Cellulose-Based Depth Filters. BioPharm 10:46-49.   2.)3MPI Application Brief: DNA Removal from Bioprocess…

An Innovative Disposable Depth Filtration System

      The Zeta Plus Encapsulated System is a disposable depth filtration system designed for the bioprocessing industry where upstream cell culture clarification or downstream impurity removal is required. The Zeta Plus Encapsulated System consists of two product lines: a small system that is ideal for lab-scale production or scale-up studies, and a large system designed for production-scale biomanufacturing. Each is composed of a filter holder, a set of top and bottom manifolds, and a flexible number of capsule…