Interactions and Dissociation Constants of Galactomannan Rendered Cellulose Films with Concavalin A by SPR Spectroscopy

Pilar Vilaro*, Carina Sampl, Gundula Marie Teichert, Werner Schlemmer, Mathias Hobisch, Michael Weißl, Luis Panizzolo, Fernando Ferreira, Stefan Spirk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Interactions of biomolecules at interfaces are important for a variety of physiological processes. Among these, interactions of lectins with monosaccharides have been investigated extensively in the past, while polysaccharide-lectin interactions have scarcely been investigated. Here, we explore the adsorption of galactomannans (GM) extracted from Prosopis affinis on cellulose thin films determined by a combination of multi-parameter surface plasmon resonance spectroscopy (MP-SPR) and atomic force microscopy (AFM). The galactomannan adsorbs spontaneously on the cellulose surfaces forming monolayer type coverage (0.60 ± 0.20 mg·m−2). The interaction of a lectin, Concavalin A (ConA), with these GM rendered cellulose surfaces using MP-SPR has been investigated and the dissociation constant KD (2.1 ± 0.8 × 10−8 M) was determined in a range from 3.4 to 27.3 nM. The experiments revealed that the galactose side chains as well as the mannose reducing end of the GM are weakly interacting with the active sites of the lectins, whereas these interactions are potentially amplified by hydrophobic effects between the non-ionic GM and the lectins, thereby leading to an irreversible adsorption
Original languageEnglish
Article number3040
Number of pages10
Issue number12
Publication statusPublished - 18 Dec 2020


  • Cellulose thin films
  • Galactomannan
  • Lectins

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

Fields of Expertise

  • Advanced Materials Science

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