¹Berlex Laboratories, Gene Therapy Department, Richmond, CA, USA

Correspondence: Dr I Kuhn, Gene Therapy Department, Berlex Laboratories, 2600 Hilltop Drive, Richmond, CA 94806, USA. E-mail: Irene_Kuhn@Berlex.com

Received 11 May 2006; Revised 19 July 2006; Accepted 20 July 2006; Published online 5 October 2006.

Abstract

Accurate adenovirus (Ad) quantification requires labor- and time-intensive viral stock purification. While crude viral lysates can be titered by plaque assay, this cell-based assay is neither rapid nor accurate. Consequently, a method for quantification of crude, unpurified viral culture lysates is needed. Given growing interest in alternative Ad serotypes (different from well-studied and characterized serotype Ad5) for basic research and for therapeutic applications, such a method should also apply to alternative serotypes. Using a Q Sepharose XL (QSXL) column-based method, we describe a robust quantification method resulting in efficient retention of viral particles of all serotypes, while non-viral components of crude infected cultures remain largely in the flow-through. The high-performance liquid chromatography-QSXL method allows rapid, accurate adenoviral quantification in crude lysates as well as identification of the various serotypes present in mixed-serotype crude lysates. We also report on conditions that efficiently strip and regenerate the column, extending its functional life.