GoBio™ Mini IEX Screening Kit includes four different ready-to-use 1 mL ion exchange chromatography columns, designed for the easy and convenient optimization and purification of proteins, peptides, and oligonucleotides by utilizing the differences in their surface charges. The columns included in this kit are GoBio Mini S (strong cation exchanger), GoBio Mini Q (strong anion exchanger), GoBio Mini DEAE (weak anion exchanger) and GoBio Mini TREN (multimodal anion exchanger). Each column is prepacked with the respective WorkBeads™ resin: WorkBeads 40S, WorkBeads 40Q, WorkBeads 40 DEAE, and WorkBeads 40 TREN.