Try phenyl methane dyes have been found in soil and river sediments as consequences of improper chemical waste disposal. 10000 dyes and pigments are produced annually world wide amounting to 7*107tones which are hazardous and pose serious environmental problems. It is estimated that 10-15% of the dye is lost in the effluent during the dying process. Try phenyl methane dye decolorizing bacteria have been isolated; there are few reports of specific enzymes that decolorize these dyes. Isolate bacterial strains which had the capability to decolorize textile dye like bromophenol blue, crystal violet and malacate green. We estimate the decolorization percentage for all the three tri phenyl methane dyes and quantify the activity of the TMR enzyme that degrades try phenyl methane dye and characterize the dye degrading organism as pseudomonas species.
Table of Contents
1. Abstract
2. Introduction
3. Materials and Methods
3.1 Isolation of the dye degrading organism
3.2 Decolorization assay
3.3 TMR Enzyme assay
3.4 Characterization of the bacterial isolates
3.4.1 IMViC tests
3.4.2 Citrate
3.4.3 Oxidase test
3.4.4 Estimation of DNA by DPA (Diphenyl amine) method
3.4.5 Amplification of TMR gene
3.4.6 Polymerase Chain Reaction
4. Results and Discussion
4.1 Decolorization assay
4.2 Enzyme activity assay
4.3 Characterization of the bacterial isolates
4.3.1 Colony Morphology
4.3.2 Gram staining
4.3.3 Biochemical Tests
4.3.4 DNA isolation
5. Conclusion
6. References
Objective and Research Scope
This study focuses on the environmental challenge of treating textile dye effluents containing hazardous triphenyl methane dyes. The primary research objective is to isolate and characterize specific bacterial strains capable of decolorizing these dyes and to quantify the activity of the associated TMR (triphenyl methane reductase) enzyme.
- Isolation of dye-degrading bacteria from textile-contaminated soil.
- Evaluation of decolorization efficiency for bromophenol blue, crystal violet, and malachite green.
- Quantification of TMR enzyme activity during the degradation process.
- Genetic characterization of the isolates and TMR gene amplification via PCR.
Excerpt from the Book
Isolation of the dye degrading organism
Soil is collected from the textile industries in and around Hyderabad. This soil is then serially diluted for isolation of bacterial colonies. The 10-5 diluted soil sample is and spread over nutrient agar media along with a dye (bromophenol blue, or malachite green)with concentrations of 20 µM, 40 µM, 60 µM,80 µM. Whereas for crystal violet the concentrations ranged from 20 µM,30 µM ,40 µM ,50 µM The petri plates are incubated for 48 hrs at 370C. The colony which has shown maximum clearing zone (≈10mm) was selected and maintained as pure culture in nutrient broth.
Summary of Chapters
Abstract: Provides a concise overview of the environmental impact of triphenyl methane dyes and outlines the study's aim to isolate degrading bacteria and characterize the TMR enzyme.
Introduction: Describes the chemical nature of dyes, the mechanisms of color fixation, and the environmental pollution challenges posed by industrial textile effluents.
Materials and Methods: Details the experimental procedures for soil sampling, bacterial isolation, decolorization assays, enzyme activity measurement, and molecular techniques including PCR.
Results and Discussion: Presents the experimental findings on decolorization percentages, enzyme activity levels, and the morphological/biochemical identification of the isolated Pseudomonas species.
Conclusion: Summarizes that the isolated soil bacteria effectively degrade the tested textile dyes through extracellular enzymatic activity, with successful TMR gene isolation via PCR.
Keywords
Microbial degradation, Triphenyl methane dyes, TMR enzyme, Pseudomonas species, Textile effluent, Decolorization assay, Bromophenol blue, Crystal violet, Malachite green, Bacterial isolates, PCR, Environmental remediation, Dye degradation, Biochemical tests, Soil bacteria.
Frequently Asked Questions
What is the primary focus of this research?
The research focuses on the microbial degradation of triphenyl methane dyes found in industrial textile effluents using bacteria isolated from contaminated soil.
What are the main dyes analyzed in this study?
The study analyzes three specific dyes: bromophenol blue, crystal violet, and malachite green.
What is the core objective of the work?
The primary goal is to isolate and identify bacterial strains capable of decolorizing these dyes and to quantify the activity of the responsible TMR enzyme.
Which scientific method is used for bacterial characterization?
The bacteria were characterized using microscopic techniques (Gram staining), biochemical assays (IMViC tests), and molecular methods including DNA isolation and PCR gene amplification.
What does the main body of the work cover?
It covers the experimental setup for soil collection, methods for assessing decolorization rates, enzyme activity assays at different concentrations, and the identification of the organism as a Pseudomonas species.
What are the key themes of this study?
Key themes include industrial environmental pollution, textile effluent treatment, microbial remediation of synthetic dyes, and enzyme kinetics.
Why are triphenyl methane dyes considered an environmental problem?
They are used in high quantities annually, are hazardous, and pose significant challenges in waste treatment due to their low levels of fixation and high solubility.
Which genus of bacteria was identified as responsible for the degradation?
The isolated organisms were identified through IMViC and biochemical tests as belonging to the genus Pseudomonas.
- Citar trabajo
- Prasad Mp (Autor), 2012, Micobial degradation of triphenyl methane dyes, Múnich, GRIN Verlag, https://www.grin.com/document/286443
