In addition to purity, protein recovery must also be considered in assessing the effectiveness of an SDS depletion protocol. With any sample manipulation, some loss will be expected, though numbers vary greatly in the literature. Considering only acetone precipita- tion, protein recovery values ranging from below 50% to nearly 100% have been reported [23–26]. Such variation in sample loss is typical of any SDS depletion protocol. Protein recovery is often a function of the sample composition and concentration, but may also simply depend on the user, as it is difficult to fully remove the supernatant without accidentally transferring a small portion of an already miniscule protein pellet [27].