Isolation and Characterization of Indigenous Arsenic-Resistant Bacteria from Raiganj, India: Unveiling Microbial Potential for Bioremediation

Introduction

Arsenic (As), a ubiquitous metalloid, poses significant environmental and health risks due to its toxicity and widespread distribution. Present in various forms, including arsenite [As(III)] and arsenate [As(V)], arsenic contamination affects water resources, soil, and ultimately, human health through bioaccumulation in the food chain. While anthropogenic activities contribute to arsenic pollution, microorganisms, particularly bacteria, play a crucial role in detoxifying arsenic-contaminated environments. These bacteria employ various mechanisms, including methylation, demethylation, biosorption, and redox reactions, to transform toxic arsenic species into less harmful forms.

Despite the importance of arsenic-resistant bacteria in bioremediation, research on indigenous bacteria in specific regions, such as Raiganj, India, remains limited. This study addresses this gap by focusing on the isolation, characterization, and identification of arsenic-resistant bacteria from soil and water samples collected from the Kulik River and Kulik Forest in Raiganj. The study aims to:

1. Isolate and culture indigenous bacteria from Raiganj exhibiting resistance to elevated concentrations of As(III) and As(V).2. Characterize the morphological and metabolic profiles of the isolated bacteria using Scanning Electron Microscopy (SEM) and Fourier-transform Infrared Spectrometry (FTIR) to understand their response to arsenic stress.3. Investigate the growth kinetics of the potent isolates in the presence and absence of arsenic stress to determine their tolerance levels.4. Evaluate the bioaccumulation ability of the bacterial isolates to remove As(III) from contaminated environments.5. Analyze the biotransformation potential of the isolates to convert As(III) into less toxic forms.

By employing these methods, this study aims to provide valuable insights into the diversity and capabilities of indigenous arsenic-resistant bacteria in Raiganj. Furthermore, the findings will contribute to the development of effective bioremediation strategies for arsenic-contaminated sites, highlighting the potential of harnessing the power of these microorganisms for environmental cleanup.