For purification of this Albumin an extensive heat-shock/diafiltration method is used, which has been shown to bring more highly purified products than the standard process acc. to Cohn. The process is taking place in a closed system. Molar extinction coefficient: 4,4x10 4 L x mol -1 x cm -1 (acc. to 0,667 L x mol -1 x cm -1 for a 0,1 % solution). Bovine Serum Albumin (BSA) Fraction V, NZ-Origin ≥98 %, sulfhydryl blocked, protease-free, IgG-free High quality albumin originating from Australia or New Zealand. By blocking the thiol groups, the polymerisation of the albumin molecules is very efficiently prevented, which can occur during the storage of powder and solution and change the properties of the albumin. The albumin remains stable over time as a monomer and can, therefore, be used very well for reproducible laboratory assays. Due to its low IgG and protease content, the albumin is excellent for all immunoassays such as WESTERN or ELISA and as a stabilising reagent for proteins, antibodies etc. Furthermore, the Albumin, sulfhydryl-blocked, NZ-Origin is recommended for all thiol or sulfur sensitive assays. Tested for the presence of free sulfhydryl groups, proteases and IgGs.