Biodegradation of melamine and its hydroxy derivatives by a bacterial consortium containing a novel Nocardioides...

Area of Science:

• Environmental Microbiology
• Bioremediation
• Food Safety

Background:

• Melamine is a harmful food contaminant found in crops due to soil and water pollution.
• Developing effective methods for melamine removal from contaminated environments is crucial.

Purpose of the Study:

• To isolate and characterize novel microorganisms capable of melamine degradation.
• To develop an efficient bacterial consortium for the bioremediation of melamine-contaminated sites.

Main Methods:

• Enrichment and isolation of melamine-degrading bacteria using the soil-charcoal perfusion method.
• Construction and optimization of a mixed-bacterial consortium for enhanced melamine degradation.
• Analysis of degradation pathways and intermediates (cyanuric acid, ammeline, ammelide).

Main Results:

• Nocardioides sp. strain ATD6 was identified as a novel melamine-degrading bacterium.
• A synergistic effect was observed in a consortium of Nocardioides sp. strain ATD6, Methyloversatilis sp. strain CDB21, and Bradyrhizobium japonicum strain CSB1.
• The optimized consortium significantly enhanced melamine and its catabolite degradation rates, particularly with the addition of ethanol.

Conclusions:

• The developed bacterial consortium offers a promising and potentially safer approach for the bioremediation of melamine-contaminated environments.
• This study contributes to developing sustainable strategies for managing food contaminants in agricultural settings.