エチレンジアミン四酢酸鉄キレート（Fe-EDTA）の海洋細菌による分解

抄録

Eight bacterial strains that can decompose a ferric chelate of ethylenediaminetetraacetic acid (Fe-EDTA) were isolated among 885 bacterial strains collected from various marine environments. Among them, the strain denoted as H6-2-4 and isolated from a sediment sample collected from Off-Izu Islands around Japan had the highest ability to decompose Fe-EDTA. The percentage of degradation of Fe-EDTA was approximately 30% in a seawater culture medium containing 1000 ppm Fe-EDTA. It was revealed that the intact cells of this strain can also decompose various metal-EDTA complexes such as Ca, Cu, and Mg. Based on results of ¹H-NMR spectral analysis, it is suggested that Fe-EDTA is converted to glycine via iminodiacetic acid. The strain was found to be a Gram-negative motile rod with polar flagella and is catalase- and oxidase-positive. It failed to grow in distilled water medium, confirming its marine origin. The strain was identified as Pseudoalteromonas atlantica based on the results of various taxonomical studies.