Overview of Known Alkaliphilic Bacteria from Bauxite Residue

Zampieri, Bruna Del Busso; Nogueira, Elis Watanabe; Quaglio, Osvail André; Brucha, Gunther

doi:10.32474/jomme.2019.01.000107

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…The presence of Brevundimonas species in extreme conditions has been reported in many cases, however, few reports are available on its abundance in red mud ponds. Earlier, mostly Gram-positive bacteria belonging to the genera Bacillus, Kokuria, Lactobacillus, Chungangia, Salinococcus and Microbacterium have been reported from red mud ponds (Zampieri et al, 2019;Wu et al, 2019;Krishna et al, 2014). Report on occurrence of Gram -ve bacterial strains is meagre.…”

Section: Effect Of Salt and Ph On Pigment Productionmentioning

confidence: 97%

“…Nevertheless, microbial diversity does exist in the red mud ponds, as many microbial propagules settle on them through air current and adapt to the environment. The adaptability includes production of acids to neutralize the alkaline milieu, development of heavy metal efflux systems, and production of antioxidants and pigments (Zampieri et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a pigmented Brevundimonas sp. isolated from red mud pond samples of a bauxite mine

Panigrahi¹

2023

JEB

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Aim: The present study aimed to isolate useful bacterial strains of industrial importance from the red mud pond of Utkal Alumina, Odisha, India. Methodology: Samples were collected, serially diluted and spread on Nutrient Agar medium. An orange-colored bacterium was isolated and subjected to molecular characterization through 16S rDNA analysis followed by phylogenetic analysis. The pigment was isolated and characterized through FTIR study. Antimicrobial and radical scavenging activities were also studied. Results: The isolate was identified as Brevundimonas sp. FTIR study showed the pigment to be a beta-carotene, which significantly increased under salt and pH stress, however, was severely affected under metallic stress conditions. The ethanolic extract showed a moderate antibacterial activity. The pigment showeda good radical scavenging activity of approximately 86 % in 30 min. Interpretation: Species of Brevundimonas have not been reported in red mud ponds. The isolated pigment shows a good radical scavenging activity in vitro. It may be useful for cosmetic industry. Key words: Red mud, 16S rDNA, Alkali tolerant, Beta-carotene, Brevundimonas, FTIR spectroscopy

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Section: Effect Of Salt and Ph On Pigment Productionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Characterization of a pigmented Brevundimonas sp. isolated from red mud pond samples of a bauxite mine

Panigrahi¹

2023

JEB

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“…The red mud is transported to impervious ponds through pipelines, and the water is recycled to reuse in the refinery. These ponds acquire a huge area and are found to be highly alkaline, thus no flora or fauna exists on these ponds (Zampieri et al, 2019). Microbial diversity is also scarce due to high-temperature treatment for the extraction of aluminium in Bayer's process (Babu and Reddy, 2011).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a yellow pigmented, alkali and heavy metal tolerant Glutamicibacter sp. isolated from red mud

Panigrahi¹

2023

EEC

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Red mud ponds are waste dumping sites of bauxite mines where highly alkaline and polluted red mud or bauxite residues are deposited. They harbour many microbial strains of environmental importance. In the present study, a yellow coloured bacterial colony was isolated which showed tolerance to high pH, and metals like lead, chromium and arsenic. Genomic DNA extraction followed by partial 16S rDNA amplification and sequencing study revealed the isolate to be Glutamicibacter sp. The bacterial strain showed luxuriant growth in pH ranging from pH5 to pH 11, and salt concentration up to 8% NaCl. The pigment was isolated by methanol extraction and identified to be beta-carotene through FTIR spectroscopy. The pigment showed absorption peaks at 436 nm and 466 nm. The pigment could not show antibacterial activity significantly. The pigments showed a good free radical scavenging activity which increased significantly under stress conditions. No such studies were done from the red mud ponds of Utkal Alumina earlier. Tolerance of the bacterial strain to various heavy metals indicates presence of heavy metals in the red mud. Identification of molecular mechanisms underlying the heavy metal resistance and use of the pigments as cosmetics can be carried out in future.

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