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Isolation and identification of potent tributyltin chloride utilizing Pseudomonas sp. strain VBAK from Vishakhapatnam shipping harbor sediments

Year: 2022
Type: article
Abstract: Screening for tributyltin (TBT)-resistant and degrading bacteria was pertinent for the selection of isolates with decontamination ability of TBT.With this rationale, 205 strains were isolated from Vishakhapatnam shipping harbor sediments and their tolerance limit to TBT was evaluated in minimal salts media containing 2 mM TBT as the sole carbon source.Fourteen selective TBT-resistant isolates showed cross-tolerance to heavy metals and antibiotics.Among them, one interesting isolate VBAK, showing the highest TBT resistance and maximum growth yield, was selected and taxonomic identification was carried out by sequencing 16S rRNA gene.The maximum composite likelihood algorithm formed a coherent cluster with clad comprised Pseudomonas sp.The thin-layer chromatography profile of the degradation product revealed the depletion of TBT into dibutyltin.The Rf values of TBT and transformed compounds were 0.8 (solvent front = 16.5 ± 2, TBT 9.1 ± 1.0) and 0.7 (solvent front = 6.5 ± 2, product 6.8 ± 2), respectively.These results suggest that Pseudomonas sp.strain VBAK is potentially useful for bioremediation of TBT contamination.Recently, Garg et al. [8] reported that concentrations of TBT in the sediments were as high as 6,381 and 10,968 ng Sn g -1 , which could be toxic to a diversified range of aquatic organisms.So TBT pollution in this harbor is of great concern.It was interesting to note that only TBT is used as an antifouling paint in this harbor.In compliance with this, we tested the hypothesis after witnessing the recent research report of dibutyltin (DBT) levels (4,459 ± 697 ng Sn g -1 ) in the harbor sediments [7].
DOI: 10.7324/jabb.2022.100203
Language: English
Open Access status: diamond
OpenAlex ID: W4213330728
FWCI:
Cites: 38
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Related to: 10