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Carotenoid Production by a Novel Isolate of Microbacterium paraoxydans .
Indian Journal of Microbiology 2018 March
This study reports extraction and characterization of carotenoid pigments from Microbacterium paraoxydans , a non-photosynthetic bacterium, cultivated in Luria-Bertani (LB) medium. The isolate was identified to be moderately halo- and osmo-tolerant capable of withstanding high (~ 6%) salt and sugar (30% w/v sucrose, 20% w/v glucose) concentrations after a brief period of adaptation. The pigments were characterized using a combination of UV-Vis spectral analysis with the λmax at 407, 436 and 466 nm and ESI-MS with an m/z value at 536.44. The absorption profile of the pigments and their nature was influenced by carbon, nitrogen source and presence of salt in the growth medium. Highest level of pigment (~ 16 g kg dry wt cells-1 ) was produced in NH4 Cl supplemented LB medium. The pigment displayed free radical scavenging, anticancer activity, characteristic of the plant carotenoids. Based on the accumulation of pigments under different conditions, a biochemical pathway for synthesis of neurosporene was proposed.
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