Learn how to use this product The Xtreme DNA Isolation Kit is a Silica-Based Spin Column Isolation Kit for Saliva and Buccal Samples. The Xtreme DNA has been specifically optimized for the DNA extraction of stabilized saliva and buccal swab samples and can process 50 samples of 0.5ml of stabilized saliva. The kit enables the retrieval of maximized results for demanding downstream application and archival purposes.