On the Surface Interactions of Proteins with Lignin

Carlos Salas, Orlando J. Rojas*, Lucian A. Lucia, Martin A. Hubbe, Jan Genzer

*Tämän työn vastaava kirjoittaja

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    45 Sitaatiot (Scopus)

    Abstrakti

    Lignins are used often in formulations involving proteins but little is known about the surface interactions between these important biomacromolecules. In this work, we investigate the interactions at the solid-liquid interface of lignin with the two main proteins in soy, glycinin (11S) and beta-conglycinin (7S). The extent of adsorption of 11S and 7S onto lignin films and the degree of hydration of the interfacial layers is quantified via Quartz crystal microgravimetry (QCM) and surface plasmon resonance (SPR). Solution ionic strength and protein denaturation (2-mercaptoethanol and urea) critically affect the adsorption process as protein molecules undergo conformational changes and their hydrophobic or hydrophilic amino acid residues interact with the surrounding medium. In general, the adsorption of the undenatured proteins onto lignin is more extensive compared to that of the denatured biomolecules and a large amount of water is coupled to the adsorbed molecules. The reduction in water contact angle after protein adsorption (by similar to 40 degrees and 35 degrees for undenatured 11S and 7S, respectively) is explained by strong nonspecific interactions between soy proteins and lignin.

    AlkuperäiskieliEnglanti
    Sivut199-206
    Sivumäärä8
    JulkaisuACS Applied Materials and Interfaces
    Vuosikerta5
    Numero1
    DOI - pysyväislinkit
    TilaJulkaistu - 9 tammikuuta 2013
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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