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 3 publications

(1 citation statement)

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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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Section: Introductionmentioning

confidence: 99%