High-purity albumin, specially designed for protease-sensitive immunoassays such as RIA and EIA as well as for fatty acid-sensitive cell culture systems. It also serves as a diluent or stabiliser of enzymes. In addition, it is suitable as a protein standard and can also be used in hybridisation experiments and nucleic acid-based assays. High-purity albumin, specially designed for protease-sensitive immunoassays such as RIA and EIA as well as for fatty acid-sensitive cell culture systems. It also serves as a diluent or stabiliser of enzymes. In addition, it is suitable as a protein standard and can also be used in hybridisation experiments and nucleic acid-based assays.