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Construction of bacterial consortium for efficient degradation of mixed pharmaceutical dyes

  • Challenges in Managing and Risk Assessment of Emerging Environmental Pollutants
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Abstract

Synthetic dyes are established colorants in the pharmaceutical industries for the coating and coloration of tablets, capsules, etc. to mark the specific formulation and dosage, improve the stability, and esthetic value. The pharmaceuticals manufacturing process releases large volumes of dye-containing wastewaters, contributing to eco-toxic concerns related to different health risks. In this study, biodegradation of amaranth, sunset yellow, tartrazine, indigo carmine, and quinoline yellow dyes was investigated in the mixed environment. Initially, 24 tolerant bacterial strains were isolated from pharmaceutical wastewater samples, among which 19 strains were found to be non-virulent. Five different consortia were constructed by considering the 19 strains among which C1 consisting of strains DY7, 10, 11, and 18 was found to be the most potential consortium with an overall efficiency of 96.65% dye degradation in the presence of glucose after 15 days. The strains DY7, 10, 11, and 18 were identified as members of the Klebsiella genus by 16S rRNA partial sequencing. The cell wall structure, carbohydrate utilization profile, and metabolic characterization were conducted on the selected strains of C1. Among the 25 different antibiotics, DY7 and DY11 exhibited the highest zone of growth inhibition in the presence of cefixime, and DY10 was restricted by chloramphenicol whereas DY18 was found sensitive to ceftazidime/tazobactam.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors express sincere gratitude towards Cadila Pharmaceuticals Limited, Gujarat, India for providing insights into the pharmaceutical industry and tablet manufacturing process. The authors are also thankful to the Central Instrumentation Facility of the National Institute of Technology Rourkela for providing suitable technical facilities.

Funding

The authors acknowledge the Department of Science and Technology, Government of India for providing the financial support in carrying out the research work (IMP/2018/000241).

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All authors have contributed to the construction of this manuscript. KP: Conceptualization, methodology, formal analysis, validation, and writing — original draft. DS: Data curation, writing — review and editing, and visualization. AS: Supervision and project administration.

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Correspondence to Angana Sarkar.

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All authors agreed to the publication of this manuscript in the journal “Environmental Science and Pollution Research”.

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The authors declare no competing interests.

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Responsible Editor: Robert Duran

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Poddar, K., Sarkar, D. & Sarkar, A. Construction of bacterial consortium for efficient degradation of mixed pharmaceutical dyes. Environ Sci Pollut Res 30, 25226–25238 (2023). https://doi.org/10.1007/s11356-021-18217-4

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  • DOI: https://doi.org/10.1007/s11356-021-18217-4

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