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Characterization of the Degradation Products from the Red Dye 40 by Enterobacteria

机译：肠杆菌对红染料40降解产物的表征

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摘要

Azo dyes such as red 40 are characterized by an Rj-N=N-R2 structure and are widely used in the food industry, but their anaerobic degradation in the gut microbiota by azoreductases originate toxic or mutagenic aromatic amines, so their use has been restricted in many countries. The aim of this study was to submit the red dye 40 to degradation by enterobacteria and partially characterize the products of its anaerobic reduction. Two enterobacteria isolated from an infant together with the reference strains: Escherichia coli DH5a, Escherichia coli E2348/69, Citrobacter rodentium DBS13 and Enterobacter cloacae were used to inoculate samples of 30 ppm of red dye 40. The degradation percentage was estimated by UV/Vis spectroscopy and the products of anaerobic reduction were characterized by HPLC. Enterobacter sp. and E. coli isolates from the infant fecal sample yielded a degradation of 60% and 49% respectively. With respect of the reference strains, the degradation percentages were high up more than 70%. The degradation of red dye 40 by the different types of bacteria used in this research revealed a formation of compounds analogous to 1-naphthol and aromatic amines.
机译：偶氮染料（例如红色40）具有Rj-N = N-R2结构的特征，已广泛用于食品工业，但是它们在肠道菌群中由于偶氮还原酶而发生的厌氧降解会产生有毒或致突变的芳香胺，因此其使用受到限制。在很多国家。这项研究的目的是使红色染料40通过肠杆菌降解并部分表征其厌氧还原的产物。从婴儿中分离出的两种肠杆菌和参考菌株：大肠杆菌DH5a，大肠杆菌E2348 / 69，啮齿类柠檬酸杆菌DBS13和阴沟肠杆菌接种了30 ppm红色染料40的样品。降解率通过UV / Vis估算光谱学和厌氧还原产物通过HPLC进行了表征。肠杆菌婴儿粪便样本中的大肠杆菌和大肠杆菌分离物分别产生60％和49％的降解。关于参考菌株，降解百分数高达70％以上。该研究中使用的不同类型细菌对红色染料40的降解表明，形成了类似于1-萘酚和芳香胺的化合物。

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