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Alkaline lipase activity from the marine protists, thraustochytrids

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Abstract

Two thraustochytrid protists of the genus Thraustochytrium isolated from coastal and mangrove habitats of Goa, India were studied for extracellular alkaline lipase production. Maximum lipase production was supported by a combination of peptone and yeast extract in the growth medium while strong inhibition of enzyme production was observed in presence of glucose. The inducible nature of the enzyme production was evidenced by the requirement of olive oil in the medium. Lipase production was salt-dependent and optimum production required 3.4% (w/v) crude sea salt. Ideal conditions for maximum production of lipases were therefore adopted as incubation at 30 ± 2°C for 168 h at an initial pH of 6.0 in a medium consisting of 0.5% peptone, 0.01% yeast extract, 0.5% olive oil and 3.4% crude salt. Extracellular lipase production by the two thraustochytrid isolates [designated TZ (ATCC #PRA-295) and AH-2 (ATCC #PRA-296)] was increased threefold under these optimized culture conditions. This appears to be the first report on optimization of cultivation conditions for the production of alkaline lipases by thraustochytrids.

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Acknowledgments

It is hereby clarified that this work does not involve any human studies. The authors also declare that they have no conflict of interest.

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Correspondence to Usha Devi Muraleedharan.

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Kanchana, R., Muraleedharan, U.D. & Raghukumar, S. Alkaline lipase activity from the marine protists, thraustochytrids. World J Microbiol Biotechnol 27, 2125–2131 (2011). https://doi.org/10.1007/s11274-011-0676-8

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