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Phospholipid adsorption from vegetable oils on acid-activated sepiolite

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Abstract

In this study, adsorption of natural and model phospholipids (PL) from camelina and rapeseed oils on acid-activated sepiolite has been studied. Adsorption isotherms were determined for total phosphorus and for individual PL at different conditions. Influence of acid-degumming with citric acid as well as of type and ionic form of the phospholipid was investigated. The experimental data were correlated using the Moreau isotherm. The results show that neutral PLs, such as phosphatidylcholines, adsorb as ordered monolayers with molecular area of 1.3 nm2/molecule. Phosphatidic acids have similar adsorption capacity when in free acid form but the interaction with the clay surface is much weaker. Sodium salt gives substantially lower saturation capacity because of electrostatic repulsion between the adsorbed PL molecules and between PL and the clay surface. Calcium and magnesium salts have very low capacity and seem to be incapable to form any ordered structures on the clay surface.

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Acknowledgments

Financial support from TEKES, Finland is gratefully acknowledged. The authors also thank Neste Oil Corp. for analysis of the samples.

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Authors and Affiliations

  1. LUT School of Engineering Science, Lappeenranta University of Technology, Skinnarilankatu 34, 53850, Lappeenranta, Finland

    Markku Laatikainen, Waroonkarn Srithammavut, Ilkka Turunen & Tuomo Sainio

  2. Neste Oil Corporation, Technology Centre, POB 310, 06101, Porvoo, Finland

    Blanka Toukoniitty

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  1. Markku Laatikainen
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  2. Waroonkarn Srithammavut
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  3. Blanka Toukoniitty
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  4. Ilkka Turunen
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  5. Tuomo Sainio
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Correspondence to Markku Laatikainen.

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Laatikainen, M., Srithammavut, W., Toukoniitty, B. et al. Phospholipid adsorption from vegetable oils on acid-activated sepiolite. Adsorption 21, 409–417 (2015). https://doi.org/10.1007/s10450-015-9681-9

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  • DOI: https://doi.org/10.1007/s10450-015-9681-9

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