Iron cycling during the autocatalytic decomposition of benzoic acid derivatives by Fenton-like and photo-Fenton techniques

Nichela, Daniela; Donadelli, Jorge A.; Caram, Bruno Federico; Haddou, Ménana; Nieto, F.; Oliveros, Esther; Einschlag, Fernando S. García

doi:10.1016/j.apcatb.2015.01.028

Cited by 46 publications

(20 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Indeed, the production of bacterial virulence factors is affected by the presence of SAL (Price et al, 2000). A peculiarity of this small molecule is its ability to form complexes with iron in aqueous solutions (Nichela et al, 2015). SAL is a weak acid that has the ability to pass through the cell membrane and form complexes with intracellular iron.…”

Section: Discussionmentioning

confidence: 99%

The Active Component of Aspirin, Salicylic Acid, Promotes Staphylococcus aureus Biofilm Formation in a PIA-dependent Manner

et al. 2017

View full text Add to dashboard Cite

Aspirin has provided clear benefits to human health. But salicylic acid (SAL) -the main aspirin biometabolite- exerts several effects on eukaryote and prokaryote cells. SAL can affect, for instance, the expression of Staphylococcus aureus virulence factors. SAL can also form complexes with iron cations and it has been shown that different iron chelating molecules diminished the formation of S. aureus biofilm. The aim of this study was to elucidate whether the iron content limitation caused by SAL can modify the S. aureus metabolism and/or metabolic regulators thus changing the expression of the main polysaccharides involved in biofilm formation. The exposure of biofilm to 2 mM SAL induced a 27% reduction in the intracellular free Fe2+ concentration compared with the controls. In addition, SAL depleted 23% of the available free Fe2+ cation in culture media. These moderate iron-limited conditions promoted an intensification of biofilms formed by strain Newman and by S. aureus clinical isolates related to the USA300 and USA100 clones. The slight decrease in iron bioavailability generated by SAL was enough to induce the increase of PIA expression in biofilms formed by methicillin-resistant as well as methicillin-sensitive S. aureus strains. S. aureus did not produce capsular polysaccharide (CP) when it was forming biofilms under any of the experimental conditions tested. Furthermore, SAL diminished aconitase activity and stimulated the lactic fermentation pathway in bacteria forming biofilms. The polysaccharide composition of S. aureus biofilms was examined and FTIR spectroscopic analysis revealed a clear impact of SAL in a codY-dependent manner. Moreover, SAL negatively affected codY transcription in mature biofilms thus relieving the CodY repression of the ica operon. Treatment of mice with SAL induced a significant increase of S aureus colonization. It is suggested that the elevated PIA expression induced by SAL might be responsible for the high nasal colonization observed in mice. SAL-induced biofilms may contribute to S. aureus infection persistence in vegetarian individuals as well as in patients that frequently consume aspirin.

show abstract

Section: Discussionmentioning

confidence: 99%

The Active Component of Aspirin, Salicylic Acid, Promotes Staphylococcus aureus Biofilm Formation in a PIA-dependent Manner

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Oxalate, which forms Fenton and photo-Fenton processes belong to the group of AOP and can be utilized for water treatment and soil remediation. Both homo-and heterogeneous Fenton systems can be used in such applications [189][190][191][192][193][194][195][196][197][198][199][200][201]. Photo-Fenton systems involving solar light have been tested to oxidize azo-dyes [202][203][204][205], pharmaceuticals [206][207][208] and herbicides [209,210].…”

Section: Photo-fentonmentioning

confidence: 99%

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Oszajca

Brindell

Orzeł

et al. 2016

Coordination Chemistry Reviews

View full text Add to dashboard Cite

“…V) Interacción con otras sustancias del medio, como por ejemplo la oxidación de un radical orgánico por parte del Fe(III). Esta mecanismo es de particular importancia ya que explica la existencia de cinéticas autocatalíticas observadas en los procesos Tipo-Fenton [18].…”

Section: Ii)unclassified

“…La Reacción 9 es más lenta que la reacción de Fenton y suele ser el paso limitante del proceso [18]. Esta reacción se ve disminuida a pH bajos y es la responsable de la pérdida de efectividad de los procesos Fenton y Tipo-Fenton a pH < 2.8 [20].…”

Section: Reacciónunclassified

“…Además de la reducción por parte del H2O2, el Fe(III) puede ser reducido por intermediarios aromáticos generados durante la oxidación de la materia orgánica, tales como los radicales de compuestos centrados en carbono y sustancias con estructura semiquinónica [21]. Debido a que estos intermediarios son producidos durante la degradación de muchos compuestos, tales como la mayoría de los colorantes textiles, las cinéticas de degradación en procesos Tipo-Fenton pueden presentar un comportamiento del tipo autocatalítico [18].…”

Section: Reacciónunclassified

See 1 more Smart Citation

Sistemas basados en el empleo de peróxido de hidrógeno para el tratamiento de efluentes textiles

Donadelli¹

View full text Add to dashboard Cite

En esta tesis se estudió la oxidación de colorantes con peróxido de hidrógeno utilizando dos estrategias de activación: el agregado de hierro metálico (Fenton asistido por ZVI) y el uso de peroxidasa de soja inmovilizada en nanomateriales magnéticos. En el caso de la Fenton asistida por ZVI se realizó un estudio minucioso de los procesos fisicoquímicos involucrados mediante ensayos en batch. Se encontró la coexistencia de dos vías de remoción (oxidativa y reductiva) cuyo peso relativo era dependiente de las condiciones operativas. Con los conocimientos generados se realizó un diseño racional de un reactor continuo capaz de funcionar a pH cercanos a la neutralidad. En el estudio de la peroxidasa inmovilizada se utilizaron soportes a base de maghemita con distintos recubrimientos de sílice, encontrándose un efecto protector de los recubrimientos sobre la actividad de la enzima.

show abstract

Iron cycling during the autocatalytic decomposition of benzoic acid derivatives by Fenton-like and photo-Fenton techniques

Cited by 46 publications

References 53 publications

The Active Component of Aspirin, Salicylic Acid, Promotes Staphylococcus aureus Biofilm Formation in a PIA-dependent Manner

The Active Component of Aspirin, Salicylic Acid, Promotes Staphylococcus aureus Biofilm Formation in a PIA-dependent Manner

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Sistemas basados en el empleo de peróxido de hidrógeno para el tratamiento de efluentes textiles

Contact Info

Product

Resources

About