Cellulose is one the most abundant carbon sources present on the earth. In the book, the author reported on production optimization and characterization of cellulolytic enzymes by thermophilic bacteria. Various adaptation strategies adapted by thermophilic bacteria are also discussed along with.
The thermophilic bacterial strain produced cellulase in the CMC broth, pH 7 containing 0.5% peptone, 0.5% malt extract, 0.2% ammonium sulphate, 0.2% ammonium nitrate and 0.2% NaCl at 50˚C. Interestingly, the bacteria could not grow at 37˚C, confirming its thermophilic nature. Further, the cellulase was characterized after getting partially purified by ammonium sulphate precipitation method. The partially purified cellulase may be employed to hydrolyze agricultural wastes to produce bioethanol, i.e. biofuels. Thus, the present research may help solve issues of crisis of renewable energy as well as environmental pollution.
Table of Contents
1. Introduction
2. Work flow
3. Review of Literature
4. Materials and Methods
5. Results
6. Discussion
7. Summary
8. References
Objectives and Topics
The primary objective of this study is to isolate and characterize potent cellulase-producing thermophilic bacteria from natural hot spring reservoirs in the Tulsi Shyam region of India, with a specific focus on optimizing production conditions and performing partial enzyme purification to evaluate its potential for industrial applications, particularly in biofuel production.
- Isolation and identification of novel thermophilic bacterial strains from thermal habitats.
- Optimization of physical and chemical parameters for enhanced cellulase production.
- Screening of bacterial isolates for diverse extracellular enzymatic activities.
- Biochemical characterization and stability analysis of thermostable cellulases.
- Assessment of the potential for commercial utilization in bioethanol and cellulosic waste degradation.
Excerpt from the Book
INTRODUCTION
Life thrives well in range of adverse environmental conditions, for example extremes of salinity, acidity, alkalinity, temperature or pressure. It always fascinates the scientific fraternity to explore the microbial diversity and phylogeny under these inhospitable habitats. Their possible adaptive measures may provide clues to various evolutionary pathways (Austin, 1988; Herbert and Sharp, 1992; Singh, 2006). Among them, the thermophilic bacteria are common in soil and volcanic habitats with limited species composition. Yet, they possess all the major nutritional categories similar to their mesophilic counterparts. Among, the genus Bacillus and related genera are widely distributed in the nature, including thermophilic, psychrophilic, acidophilic, alkaliphilic and halophilic bacteria, which can be able to utilize a wide range of carbon sources for the heterotrophic or autotrophic growth (Claus and Berkeley, 1986; Nazina et al., 2001).
On the other hand, cellulose is the most abundant biomass on Earth, being the primary product of photosynthesis in the terrestrial environment and the most plentiful renewable bioresource. Cellulases, a group of enzymes commonly breaks cellulose, are produced by several microorganisms, mainly by bacteria and fungi. They are inducible enzymes which are synthesized by microorganisms during their growth on cellulosic materials. The complete enzymatic hydrolysis of cellulosic materials needs different types of cellulases: namely endoglucanase (1,4-β-d-glucan-4glucanohydrolase), exocellobiohydrolase (1,4-β-d-Glucan glucohydrolase) and β-glucosidase (β-d-glucoside glucohydrolase). The endoglucanase randomly hydrolyzes β 1,4 bonds in the cellulose molecule, whereas the exocellobiohydrolases in most cases release a cellobiose unit, showing a recurrent reaction from chain extremity. Lastly, the cellobiose is converted to glucose by β-glucosidase.
Summary of Chapters
Introduction: Provides a background on extremophilic microorganisms and the industrial importance of cellulases derived from thermophilic bacteria for renewable energy applications.
Work flow: Outlines the systematic experimental process, from site sampling and isolation to enzyme purification and final characterization.
Review of Literature: Surveys the existing scientific knowledge regarding microbial life in thermal environments, bacterial adaptation strategies, and the biochemistry of cellulolytic enzymes.
Materials and Methods: Details the specific procedures for environmental sample collection, bacterial isolation, enzymatic screening, and the analytical methods used for protein purification and assaying.
Results: Presents the experimental findings regarding the isolation of thermophilic strains, their morphological and biochemical traits, and the effects of varying cultivation conditions on cellulase yields.
Discussion: Interprets the research results in the context of existing literature, discussing the impact of temperature, pH, and carbon/nitrogen sources on enzyme production and potential industrial feasibility.
Summary: Concisely highlights the key findings, including the successful isolation of cellulolytic thermophiles and the optimization of production parameters for efficient hydrolysis.
References: Compiles the comprehensive list of academic sources and literature cited throughout the study.
Keywords
Thermophilic bacteria, Cellulase, Enzyme production, Bioethanol, Microbial diversity, Tulsi Shyam, Extremophiles, Biocatalysis, Ammonium sulphate fractionation, Substrate specificity, Bacillus, Anoxybacillus rupiensis, Fermentation, Hydrolysis, Cellulose degradation.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the isolation and characterization of thermophilic bacteria capable of producing thermostable cellulases, and evaluating their suitability for industrial applications.
What are the primary thematic areas explored?
The work explores microbial diversity in thermal habitats, the optimization of enzymatic production through physical and chemical factors, and the characterization of cellulase stability.
What is the primary goal of the study?
The goal is to develop efficient processes for the production and partial purification of cellulases to enable cost-effective treatment and utilization of cellulosic wastes.
Which scientific methods were employed?
The study utilized enrichment culture techniques, 16S rRNA gene sequencing for identification, enzymatic activity assays, and ammonium sulphate fractionation for protein purification.
What does the main body of the work cover?
The main body details the methodology for isolating bacteria from hot springs, the optimization of growth parameters like temperature and pH, and the evaluation of carbon and nitrogen sources for enzyme yield.
Which keywords characterize this research?
Key terms include thermophilic bacteria, cellulase, biofuel production, extremophiles, and bioprocessing of agricultural residues.
What is the significance of the Tulsi Shyam research site?
Tulsi Shyam serves as a unique, natural thermal habitat in the Saurashtra region of Gujarat, providing a valuable source for identifying novel thermophilic strains with potential biotechnological significance.
How does glucose affect cellulase production in the isolated strains?
The study found that the presence of simple sugars like glucose leads to catabolite repression, which significantly inhibits the synthesis of cellulases in the tested strains.
- Arbeit zitieren
- Bhavtosh Kikani (Autor:in), 2018, Production and Characterization of Bacterial Thermostable Cellulase, München, GRIN Verlag, https://www.grin.com/document/413980
