GST SpinTrap columns are designed for rapid small-scale purification of GST-tagged proteins directly from clarified or unclarified cell lysates. GST-tagged proteins can be recovered under mild elution conditions (10 mM glutathione), which preserves the functionality of the proteins, and more than 90% purity can be obtained in a single step. GST SpinTrap columns are suitable for purification of multiple samples in parallel, for example in screening experiments such as evaluation of chromatography media, growth temperature, culture density, and other variables to find optimal conditions for expression.