English to Spanish Science Biology (-tech,-chem,micro-) by electron paramagnetic resonance (EPR) and probed with benzoic acid

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4.2.2. Effect of metal ion
In recent years, Fe3+ has been found to possess the ability to
enhance the biodegradation/decomposition of pollutants. During
the anaerobic reduction of azo dyes by Shewanella decolorationis
S12, which is linked to cell membrane electron transport [39], the
decolorization efficiency was significantly influenced by Fe3+. The
decolorization efficiency of azo dye was increased by about 30%
after addition of 6mM Fe3+ [39]. In our laboratory, an organotin
decomposition factor pyochelin (PCH) secreted by P. aeruginosa
CGMCC1.860 even in the presence of 100 MFe3+ was purified [40].
Interestingly, the decomposition of triphenyltin (TPT) by purified
PCH can be greatly enhanced by Fe3+, Zn2+, Co2+, Mn2+ and Cu2+.
The decomposition rate of TPT by FePCH was 3.4-fold higher than
that of PCH alone after a 12 h reaction. During the decomposition of
TPT by FePCH, formation ofHO• was detected by electron paramagnetic
resonance (EPR) and probed with benzoic acid . The formation
of HO• was also confirmed as the mechanism of enhancement of
TPT decomposition by Fe3+. Using NMR and ESI-MS/MS, the existence
of TPT–FePCH ternary complex in the reaction mixture was
suggested. These results indicate that Fe3+ could enhance organotin
decomposition by PCH and that the formation of HO• and
an organotin–PCH–iron ternary complex was the reason for this
augmentation by Fe3+ [3].