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Isolation and characterization of a Pseudomonas sp. strain PH1 utilizing meta-aminophenol
R Kutty1, H J Purohit, P Khanna
1National Environmental Engineering Research Institute, Nagpur, India.
Abstract:
Pseudomonas sp. strain PH1 was isolated from soil contaminated with pharmaceutical and dye industry waste. The isolate PH1 could use m-aminophenol as a sole source of carbon, nitrogen, and energy to support the growth. PH1 could degrade up to 0.32 mM m-aminophenol in 120 h, when provided as nitrogen source at 0.4 mM concentration with citrate (0.5 mM) as a carbon source in the growth medium. The presence of ammonium chloride as an additional nitrogen source repressed the degradation of m-aminophenol by PH1. To identify strain PH1, the 16S rDNA sequence was amplified by PCR using conserved eubacterial primers. The FASTA program was used to analyze the 16S rDNA sequence and the resulting homology patterns suggested that PH1 is a Pseudomonas.
Insights
A novel Pseudomonas strain, PH1, isolated from industrial waste, effectively degrades m-aminophenol, a pollutant. This bacterium utilizes m-aminophenol as its sole source of carbon, nitrogen, and energy for growth.
Area of Science:
- Environmental microbiology
- Bioremediation
- Industrial microbiology
Background:
- Soil contamination from pharmaceutical and dye industries poses environmental challenges.
- Microbial degradation offers a sustainable solution for pollutant removal.
- Understanding microbial metabolic capabilities is crucial for bioremediation strategies.
Purpose of the Study:
- To isolate and identify microorganisms capable of degrading m-aminophenol from contaminated soil.
- To investigate the degradation efficiency and conditions for m-aminophenol utilization by the isolate.
- To characterize the taxonomic identity of the promising microbial isolate.
Main Methods:
- Isolation of microbial strains from pharmaceutical and dye industry-contaminated soil.
- Cultivation and growth experiments using m-aminophenol as a sole source of carbon, nitrogen, and energy.
- Optimization of degradation conditions, including substrate concentration and presence of other nutrients.
- Molecular identification using Polymerase Chain Reaction (PCR) amplification of 16S ribosomal DNA (rDNA) and sequence analysis (FASTA program).
Main Results:
- Isolation of Pseudomonas sp. strain PH1 from contaminated soil.
- Strain PH1 demonstrated the ability to degrade m-aminophenol, utilizing it as a sole source of carbon, nitrogen, and energy.
- Degradation of up to 0.32 mM m-aminophenol in 120 hours was observed under specific conditions (0.4 mM m-aminophenol as N-source, 0.5 mM citrate as C-source).
- Degradation was repressed by the addition of ammonium chloride, indicating specific metabolic regulation.
- 16S rDNA sequence analysis confirmed the isolate as belonging to the genus Pseudomonas.
Conclusions:
- Pseudomonas sp. strain PH1 is a promising candidate for the bioremediation of m-aminophenol-contaminated environments.
- The study elucidates the metabolic potential of Pseudomonas sp. PH1 for utilizing m-aminophenol as a nutrient source.
- Further research can explore the enzymatic pathways involved and optimize conditions for large-scale application in wastewater treatment.