To sequester and solubilize ferric iron many chrome azurol S (CAS), and a chelator or sideromicroorganisms
utilize an efficient system consisting of low-molecular mass (,1000 Da) compounds
with high iron affinity, termed siderophores (Hider,1984; Neilands, 1984, 1995). Nowadays, the most common detection method for siderophore product-ion is the universal assay of Schwyn and Neilands