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Insights into the methodological perspectives for screening polyunsaturated fatty acids-containing bacteria
Vishnu Ramachandran1,2, Sumithra Thangalazhy Gopakumar3, Krupesha Sharma Sulumane Ramachandra1
1Marine Biotechnology, Fish Nutrition, and Health Division, ICAR-Central Marine Fisheries Research Institute (ICAR-CMFRI), Post Box No. 1603, Ernakulam North P.O., Kochi, 682018, India.
This study evaluated 15 methods for identifying polyunsaturated fatty acids (PUFA)-producing bacteria. The H2O2 plate assay and TTC broth assay proved most effective for specific PUFAs, identifying novel bacterial strains for future research.
Area of Science:
- Microbiology
- Biotechnology
- Analytical Chemistry
Background:
- Polyunsaturated fatty acids (PUFAs) are crucial in pharmaceuticals, medicine, and nutrition.
- Identifying bacterial strains for PUFA production is vital for industrial applications.
- Extensive screening of diverse sources is necessary to find promising PUFA-producing bacteria.
Purpose of the Study:
- To evaluate 15 screening methodologies for identifying PUFA-producing bacteria.
- To compare these methods against the gold standard Gas chromatography-mass spectrometry (GC-MS).
- To optimize PUFA screening processes for efficiency and resource conservation.
Main Methods:
- Evaluation of 15 distinct screening techniques, including modifications to existing protocols (reagent concentration, incubation temperature, and time).
- Comparison of developed methods with Gas chromatography-mass spectrometry (GC-MS) as the gold standard.
- Utilized H2O2 plate assay and 2,3,5-triphenyl tetrazolium chloride (TTC) broth assay for specific PUFA detection.
Main Results:
- The H2O2 plate assay (0.5%-1% H2O2, 72-96h incubation at 15°C) excelled in detecting bacteria with total long-chain PUFA (LC-PUFA), linoleic acid, and arachidonic acid.
- The TTC broth assay (10-15°C) was the most effective semiquantitative method for identifying eicosapentaenoic acid (EPA) and alpha-linolenic acid.
- Identified novel strains: Shewanella decolorationis (DHA), Psychrobacter maritimus (EPA), Micrococcus aloeverae (EPA), and Arthrobacter rhombi (EPA and DHA).
Conclusions:
- Optimized screening protocols significantly save time and resources in PUFA detection.
- Established effective methods for specific PUFA identification, aiding future research.
- Discovered novel bacterial strains with potential for biotechnological PUFA production.
