Abstract
The production of catecholate siderophores was studied in some selected species of Enterobacter (Enterobacteriaceae). The extracted catecholates were separated as iron-free compounds by HPLC on a C18 reversed-phase column using methanol/0.1% phosphoric acid or methanol/0.1% formic acid as a solvent system and identified by ion spray mass spectrometry (LC/MS, MS/MS). Five catecholate compounds were identified which include 2,3-dihydroxybenzoylserine, its linear dimer and trimer, the cyclic enterobactin and an unidentified isomer of enterobactin. In addition, a new large-scale method for the isolation of catecholate siderphores is described which is based on adsorption on XAD-2 and subsequent purification on Sephadex LH20.
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