Hexavalent Chromium Removal by a Trichoderma inhamatum Fungal Strain Isolated from Tannery Effluent

Morales-Barrera, Liliana; Cristiani‐Urbina, Eliseo

doi:10.1007/s11270-007-9520-z

Cited by 61 publications

(31 citation statements)

References 52 publications

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“…By using desorption and X-Ray Photoelectron Spectroscopy (XPS) studies they showed that most of the Cr bound onto the biomass was in the trivalent form and postulated that the main mechanism of Cr(VI) removal was a redox reaction between Cr(VI) and the dead fungal biomass, which is quite different from previously reported mechanisms. It was also reported that Trichoderma inhamatum, grown in a batch culture system, exhibited a remarkable capacity to tolerate and completely reduce Cr(VI) to Cr(III) from initial concentrations of 0.83 up to 2.43 mM [56] and that the specific and volumetric rates of Cr(VI) reduction by this fungus decreased as the initial Cr(VI) concentration increased.…”

Section: Chromium Removal Via Uptake By the Fungal Biomassmentioning

confidence: 88%

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Shugaba¹,

Buba²,

Bg³

et al. 2012

J Pet Environ Biotechnol

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The uptake and reduction of Cr(VI) by Aspergillus niger and A. parasiticus was studied in this journal. After 96 hours of growth, the culture solutions spiked with an initial dichromate concentration of 20 mg/l, were completely decolorized and had residual Cr(VI) concentrations of only 0.74 ± 0.55 and 1.69 ± 0.29 mg/l in A. niger and A. parasiticus cultures representing Cr(VI) removal of 96.3% and 91.6%, respectively. In the A. niger culture, significantly (P < 0.01) lower Cr(VI) concentrations were observed within 72 hours of growth compared to those of A. parasiticus, but in both cultures complete removal was almost achieved by 144 hours of growth. The rate of Cr(VI) removal was 0.21 ± 0.09 mgl -1 hr -1 and 0.20 ± 0.07 mgl -1 hr -1 for A. niger and A. parasiticus, respectively. Cellular concentrations of Cr(VI) in the two fungi increased significantly (P < 0.05 -0.001) with increasing concentrations of the dichromate treatments. Although tannic acid as sole source of carbon and energy gave significantly lower Cr(VI) removal than glucose (P < 0.001) and acetate (P < 0.01), it supported the removal of about 85.0% and 68.8% of the metal ion by A. niger and A. parasiticus, respectively. The active mycelia of both fungi showed significantly (P < 0.001) higher Cr(VI) removal than inactivated mycelia after incubation at 30°C for 72 hours. Incubation of cell -free extracts of both fungi with NADH at 30°C for 2 hours showed Cr(VI) reduction of 68.0% and 55.5% for A. niger and A. parasiticus, respectively. These findings suggest that uptake and metabolic reduction may be the process by which the two fungi are able to tolerate the toxic effects of hexavalent chromium. However, Cr removal via uptake by the two fungal biomass was observed to be in the range of 0.5 -1.78% only, for all the concentrations applied, which is insignificant when compared with the initial Cr concentration in the culture medium. The results obtained through this investigation indicate the possibility of treating waste effluents containing hexavalent chromium using Aspergillus niger and A. parasiticus.

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Section: Chromium Removal Via Uptake By the Fungal Biomassmentioning

confidence: 88%

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Shugaba¹,

Buba²,

Bg³

et al. 2012

J Pet Environ Biotechnol

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“…La pared celular fúngica tiene diferentes grupos funcionales que pueden formar complejos de coordinación con los metales, lo que puede facilitar la remoción de los mismos en solución. Además, nuestras observaciones son similares a la mayoría de reportes de la literatura (Morales-Barrera y Cristiani- Urbina, 2008;Rodríguez et. al., 2008 También, se realizó un estudio de biorremediación, en el cual se inocularon 5 x 10 5 esporas/mL, a 100 mL de LMM (pH 5.3.)…”

Section: Resultados Y Discusiónunclassified

Remoción de Cromo (VI) por una Cepa de Aspergillus niger Resistente a Cromato

et al. 2015

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ResumenEl objetivo de este trabajo fue analizar la capacidad de remoción de Cr (VI) por una cepa de Aspergillus niger, por el método colorimétrico de la difenilcarbazida. Cuando el hongo se incubó en medio mínimo con glucosa y otras fuentes de carbono comerciales y económicas, como azúcar no refinada o glicerol, en presencia de 50 mg/L de Cr (VI), removió totalmente el metal. Se produjo también Cr (III) en el medio de cultivo, después de 6 días de incubación a 28°C, pH de 5.3 y 6.2, agitación a una velocidad de 100 rpm y un inoculo de 8.3 mg de peso seco. Los resultados obtenidos indican que la cepa de A. niger tiene la capacidad de reducir Cr (VI) a Cr (III), y por lo tanto puede utilizarse para eliminar la contaminación por Cr (VI). Palabras clave: remoción de cromo, resistencia, cromo (VI), biomasa fúngica, biorremediación Chromium (VI) Removal by a Chromate-Resistant Strain of Aspergillus niger AbstractThe objective of this work was to analyze the capability a fungal strain of Aspergillus niger to reduce chromium (VI), using the colorimetric method of diphelylcarbazide. When the strain was incubated in minimal medium with glucose and other inexpensive commercial carbon sources such as unrefined sugar or glycerol, in presence of 50 mg/L of Cr (VI), the strain completely removed Cr (VI). Also, Cr (III) was produced in the growth medium after 6 days of incubation, at 28°C, pH of 5.3 and 6.2, agitation speed of 100 rpm and an inoculum of 8.3 mg of dry weight. These results indicate that the fungal strain of Aspergillus niger has the capacity of reducing Cr (VI) to Cr (III), and therefore it can be used in for reducing Cr (VI) pollution.

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“…A las concentraciones analizadas (38, 76, y 114 mg de peso seco), la capacidad de remoción fue similar (99.17%, 97.95%, y 97.25%, respectivamente). En contraste a nuestras observaciones, la mayoría de los reportes en la literatura indican que a mayor cantidad de biomasa aumenta el porcentaje de remoción (Srivastava y Thakur, 2006;Morales-Barrera y Cristiani-Urbina, 2008;Rodríguez et. al., 2008), pues a mayor cantidad de inoculo, hay más sitios de unión para acomplejar el metal (por ejemplo, los iones HCrO -4 y Cr 2 O 7 -2 ) (Cervantes et.…”

Section: Resultados Y Discusiónunclassified

“…Además, nuestras observaciones son similares a la mayoría de reportes de la literatura (MoralesBarrera y Cristiani-Urbina, 2008;Rodríguez et. al., 2008).…”

Section: Información Tecnológica Vol 22 Nº 4 -2011 46unclassified