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Fatty Acid Profiling During Microbial Lipid Production Under Varying pO2 and Impeller Tip Speeds

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Abstract

The fatty acid profile study was undertaken to study the effect of impeller tip speed-associated shear stress and dissolved oxygen saturation (DO) on the fatty acid composition variation and on total lipid content of the cells. The study was undertaken in a 5-l stirred tank bioreactor using Mucor sp. RRL001. To study the interaction of parameters and their effects, a central composite design was used. The fatty acid profiling during the course of study suggested that oleic acid and palmitic acid were two major components with their composition varying between 34–47% and 29–39.1%, respectively, of the total lipid content. The GLA content varied between 3% and 9% of the total lipid. The lipid profile study also revealed the presence of a minor amount of fatty acids of chain length C:12, C:20, C:22, and C:24. The modeling of lipid accumulation suggested that it follows a quadratic model with both impeller tip speed (p = 0.0166) and dissolved oxygen concentration (p = 0.0098) following the quadratic order of effect. The fermenter run based on the optimum production zone in response surface plot resulted in the maximum 4.8 g l−1 lipid compared with the model-predicted value of 4.49 g l−1. The present study suggests that dissolved oxygen saturation is a more significant contributor to total lipid accumulation. However, the study also suggests that the fatty acid profile of fungal lipid is not directly associated with the shear stress or oxygen availability in Mucor sp. RRL001.

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Acknowledgements

One of the authors, Syed Ubaid Ahmed, thanks CSIR, New Delhi, India for the SRF fellowship. The proposed work was financially supported by a CSIR Task Force CMM006 grant.

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Authors and Affiliations

  1. Biotechnology Division, National Institute for Interdisciplinary Science and Technology (formerly Regional Research Laboratory), CSIR, Industrial Estate PO, Trivandrum, India

    Syed Ubaid Ahmed, Sudheer Kumar Singh & Ashok Pandey

  2. Oils and Fats Division, Indian Institute of Chemical Technology, Hyderabad, India

    Sanjit Kanjilal & Rachapudi B. N. Prasad

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  1. Syed Ubaid Ahmed
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  2. Sudheer Kumar Singh
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  4. Sanjit Kanjilal
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Correspondence to Ashok Pandey.

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Ahmed, S.U., Singh, S.K., Pandey, A. et al. Fatty Acid Profiling During Microbial Lipid Production Under Varying pO2 and Impeller Tip Speeds. Appl Biochem Biotechnol 151, 599–609 (2008). https://doi.org/10.1007/s12010-008-8261-9

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