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<p><i>Halomonas alkaliphila</i> MTCC 13,699, a moderate halophilic bacterium, was isolated from Drang salt mines, Mandi, Himachal Pradesh, with the ability to grow in 5–18% salt, exhibiting optimum growth at 12–14% salt concentration. The halophilic bacterium demonstrated varied responses to the toxic effects of the eleven dyes tested. Among these, methylene blue was found to be the most toxic, followed by eriochrome black and gentian violet, whereas indigo carmine and congo red demonstrated the least toxicity. The dye degradation assay conducted at 100&#xa0;mg/L demonstrated a progressive increase in degradation over a five-day period (0–96&#xa0;h). Highest degradation at 96&#xa0;h was observed in malachite green (84.13%), followed by gentian violet (82.18%), methyl orange (81.12%), congo red (76.14%), methyl red (64.90%), bromo phenol blue (25.56%), methylene blue (19.76%), and indigo carmine (16.6%). The susceptibility pattern to antibiotics demonstrated that the bacterium is a safe isolate, free from concerns of multidrug resistance.</p>

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Halomonas alkaliphila MTCC 13,699: A Halophilic Solution for Degrading Toxic Dyes in High-Salinity Environments

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Jyotsna K. Peter,
  • Arun Kumar,
  • Ashok K. Yadav,
  • Praveen Kumar Mehta

摘要

Halomonas alkaliphila MTCC 13,699, a moderate halophilic bacterium, was isolated from Drang salt mines, Mandi, Himachal Pradesh, with the ability to grow in 5–18% salt, exhibiting optimum growth at 12–14% salt concentration. The halophilic bacterium demonstrated varied responses to the toxic effects of the eleven dyes tested. Among these, methylene blue was found to be the most toxic, followed by eriochrome black and gentian violet, whereas indigo carmine and congo red demonstrated the least toxicity. The dye degradation assay conducted at 100 mg/L demonstrated a progressive increase in degradation over a five-day period (0–96 h). Highest degradation at 96 h was observed in malachite green (84.13%), followed by gentian violet (82.18%), methyl orange (81.12%), congo red (76.14%), methyl red (64.90%), bromo phenol blue (25.56%), methylene blue (19.76%), and indigo carmine (16.6%). The susceptibility pattern to antibiotics demonstrated that the bacterium is a safe isolate, free from concerns of multidrug resistance.