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Hexavalent Chromium Removal by a Paecilomyces sp. Fungal Strain Isolated from Environment.

Cárdenas-González JF, Acosta-Rodríguez I - Bioinorg Chem Appl (2010)

Bottom Line: A resistant and capable fungal strain in removing hexavalent chromium was isolated from an environment near of Chemical Science Faculty, located in the city of San Luis Potosí, Mexico.Strain resistance of the strain to high Cr (VI) concentrations and its ability to reduce chromium were studied.When it was incubated in minimal medium with glucose, another inexpensive commercial carbon source like unrefined and brown sugar or glycerol, in the presence of 50 mg/L of Cr (VI), the strain caused complete disappearance of Cr (VI), with the concomitant production of Cr (III) in the growth medium after 7 days of incubation, at 28 degrees C, pH 4.0, 100 rpm, and an inoculum of 38 mg of dry weight.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Micología Experimental, Centro de Investigación y de Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Avenue Dr. Manuel Nava No. 6, Zona Universitaria, 78320 San Luis Potosí, SLP, Mexico.

ABSTRACT
A resistant and capable fungal strain in removing hexavalent chromium was isolated from an environment near of Chemical Science Faculty, located in the city of San Luis Potosí, Mexico. The strain was identified as Paecilomyces sp., by macro- and microscopic characteristics. Strain resistance of the strain to high Cr (VI) concentrations and its ability to reduce chromium were studied. When it was incubated in minimal medium with glucose, another inexpensive commercial carbon source like unrefined and brown sugar or glycerol, in the presence of 50 mg/L of Cr (VI), the strain caused complete disappearance of Cr (VI), with the concomitant production of Cr (III) in the growth medium after 7 days of incubation, at 28 degrees C, pH 4.0, 100 rpm, and an inoculum of 38 mg of dry weight. Decrease of Cr (VI) levels from industrial wastes was also induced by Paecilomyces biomass. These results indicate that reducing capacity of chromate resistant filamentous fungus Cr (VI) could be useful for the removal of Cr (VI) pollution.

No MeSH data available.


Related in: MedlinePlus

Growth in dry weight of Paecilomyces sp. with different concentrations of Cr (VI). 1 × 105 spores/mL, 28°C, 7 days of incubation, 100 rpm.
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fig1: Growth in dry weight of Paecilomyces sp. with different concentrations of Cr (VI). 1 × 105 spores/mL, 28°C, 7 days of incubation, 100 rpm.

Mentions: The fungal strain isolated was able to grow on LMM supplemented with 2000 mg/L of Cr (VI) (Figure 1). This indicates that this fungus developed the Cr (VI) resistance and probably the Cr (VI) is being reduced in the polluted air. A variety of microorganisms with the Cr (VI) resistance and Cr (VI) reducing ability have been isolated from effluents of tanneries [3, 7, 14]. Colonies of the isolated fungal strain grew rapidly and mature within 3 days. Paecilomyces sp. are thermopile and can grow well at temperatures as high as 50° and 60°C. The colonies are flat, powdery, or velvety in texture. The initial color is white, and becomes yellow, yellow-green, pink, or violet. The reverse is dirty white or buff. A sweet aromatic color may be associated with older cultures. Septate hyaline hyphae, conidiophores, phialides, conidia, and chlamidospores are observed. Conidiophores (3-4 μm wide and 400–600 μm long) are often branched and carry the phialides at their tips. The phialides are swollen at their bases and taper towards their apices. They are usually grouped in pair or brush-like clusters. Conidia are unicellular, hyaline to darkly colored, smooth or rough, oval to fusoid, and form long chains. Chlamidospores are occasionally present [15].


Hexavalent Chromium Removal by a Paecilomyces sp. Fungal Strain Isolated from Environment.

Cárdenas-González JF, Acosta-Rodríguez I - Bioinorg Chem Appl (2010)

Growth in dry weight of Paecilomyces sp. with different concentrations of Cr (VI). 1 × 105 spores/mL, 28°C, 7 days of incubation, 100 rpm.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2902107&req=5

fig1: Growth in dry weight of Paecilomyces sp. with different concentrations of Cr (VI). 1 × 105 spores/mL, 28°C, 7 days of incubation, 100 rpm.
Mentions: The fungal strain isolated was able to grow on LMM supplemented with 2000 mg/L of Cr (VI) (Figure 1). This indicates that this fungus developed the Cr (VI) resistance and probably the Cr (VI) is being reduced in the polluted air. A variety of microorganisms with the Cr (VI) resistance and Cr (VI) reducing ability have been isolated from effluents of tanneries [3, 7, 14]. Colonies of the isolated fungal strain grew rapidly and mature within 3 days. Paecilomyces sp. are thermopile and can grow well at temperatures as high as 50° and 60°C. The colonies are flat, powdery, or velvety in texture. The initial color is white, and becomes yellow, yellow-green, pink, or violet. The reverse is dirty white or buff. A sweet aromatic color may be associated with older cultures. Septate hyaline hyphae, conidiophores, phialides, conidia, and chlamidospores are observed. Conidiophores (3-4 μm wide and 400–600 μm long) are often branched and carry the phialides at their tips. The phialides are swollen at their bases and taper towards their apices. They are usually grouped in pair or brush-like clusters. Conidia are unicellular, hyaline to darkly colored, smooth or rough, oval to fusoid, and form long chains. Chlamidospores are occasionally present [15].

Bottom Line: A resistant and capable fungal strain in removing hexavalent chromium was isolated from an environment near of Chemical Science Faculty, located in the city of San Luis Potosí, Mexico.Strain resistance of the strain to high Cr (VI) concentrations and its ability to reduce chromium were studied.When it was incubated in minimal medium with glucose, another inexpensive commercial carbon source like unrefined and brown sugar or glycerol, in the presence of 50 mg/L of Cr (VI), the strain caused complete disappearance of Cr (VI), with the concomitant production of Cr (III) in the growth medium after 7 days of incubation, at 28 degrees C, pH 4.0, 100 rpm, and an inoculum of 38 mg of dry weight.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Micología Experimental, Centro de Investigación y de Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Avenue Dr. Manuel Nava No. 6, Zona Universitaria, 78320 San Luis Potosí, SLP, Mexico.

ABSTRACT
A resistant and capable fungal strain in removing hexavalent chromium was isolated from an environment near of Chemical Science Faculty, located in the city of San Luis Potosí, Mexico. The strain was identified as Paecilomyces sp., by macro- and microscopic characteristics. Strain resistance of the strain to high Cr (VI) concentrations and its ability to reduce chromium were studied. When it was incubated in minimal medium with glucose, another inexpensive commercial carbon source like unrefined and brown sugar or glycerol, in the presence of 50 mg/L of Cr (VI), the strain caused complete disappearance of Cr (VI), with the concomitant production of Cr (III) in the growth medium after 7 days of incubation, at 28 degrees C, pH 4.0, 100 rpm, and an inoculum of 38 mg of dry weight. Decrease of Cr (VI) levels from industrial wastes was also induced by Paecilomyces biomass. These results indicate that reducing capacity of chromate resistant filamentous fungus Cr (VI) could be useful for the removal of Cr (VI) pollution.

No MeSH data available.


Related in: MedlinePlus