Adsorption of impurities in vegetable oil : A molecular modelling study

Maisa Vuorte, Sampsa Vierros, Susanna Kuitunen, Maria Sammalkorpi*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

1 Sitaatiot (Scopus)

Abstrakti

Here, the adsorption of impurity species from triglyceride solvent representing a model vegetable oil is studied using atomistic molecular dynamics simulations. We compare the adsorption of water, glycerol, oleic acid, monoolein, and two types of phospholipids on model silica adsorbents differing in their OH-group density, i.e. hydrogen bonding ability, quartz and cristobalite. We find that the species containing charged groups, phospholipids DOPC and DOPE, adsorb significantly stronger than the nonionic impurities. Secondary contribution to adsorption arises from hydrogen bonding capability of the impurity species, the silica surface, and also the triglyceride solvent: in general, more hydrogen bonding sites in impurity species leads to enhanced adsorption but hydrogen bonding with solvent competes for the available sites. Interestingly, adsorption is weaker on cristobalite even though it has a higher hydrogen bonding site density than quartz. This is because the hydrogen bonds can saturate each other on the adsorbent. The finding demonstrates that optimal adsorption response is obtained with intermediate adsorbent hydrogen bonding site densities. Additionally, we find that monoolein and oleic acid show a concentration driven adsorption response and reverse micelle like aggregate formation in bulk triglyceride solvent even in the absence of water. The findings offer insight into adsorption phenomena at inorganic adsorbent - apolar solvent interfaces and provide guidelines for enhanced design of adsorbent materials for example for vegetable oil purification.

AlkuperäiskieliEnglanti
Sivut55-65
Sivumäärä11
JulkaisuJournal of Colloid and Interface Science
Vuosikerta571
DOI - pysyväislinkit
TilaJulkaistu - 1 heinäkuuta 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Projektit

    CERES: Competence Center for the materials Bioeconomy: A Flagship for our Sustainable Future

    Mäkelä, K.

    01/05/201831/12/2022

    Projekti: Academy of Finland: Other research funding

    Veden ja suolan vaikutus polyelektrolyyttikomplekseissa

    Batys, P., Sammalkorpi, M., Vuorte, M., Mohammadyarloo, Z., Javannikkhah, S., Mudedla, S., Khavani Sariani, M. & Kyllönen, M.

    01/09/201731/08/2021

    Projekti: Academy of Finland: Other research funding

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