2.2.3. Synthesis of siderophores
Siderophore secretion by strains was qualitatively detected by the
“universal” method of Schwyn and Neilands (1987) using blue agar
plates containing the ternary complex chrome azurol S (CAS)/iron
(III)/hexadecyltrimethyammonium bromide as an indicator. Change in
the dye colour fromblue to orange indicated production of siderophore.