Adsorption of BSA on highly carboxylated microspheres - Quantitative effects of surface functional groups and interaction forces

Jeong Yeol Yoon, Ham Yong Park, Jung Hyun Kim, Woo Sik Kim

Research output: Contribution to journalArticlepeer-review

169 Scopus citations

Abstract

In order to elucidate the relations between the amount of surface functional groups and interaction forces, BSA adsorption experiments were performed, using highly carboxylated PS/PMAA microspheres as well as conventional ones. Two kinds of interaction forces were considered in this study, hydrogen bonding and hydrophobic interactions, while ionic interactions were assumed to be small or constant. Hydrophobic interactions were dominant in the low Nc (number density of surface carboxyl groups) region, below 1 carboxyl group nm-2, and were relatively sensitive to pH, while hydrogen bonding was dominant in the high Nc region, above 2 carboxyl groups nm-2, irrespective of pH. The transition region between these two interaction forces was 1 ∼ 2 carboxyl groups nm-2 on the surface of a microsphere. When comparing the two extremes of hydrophobic interaction and hydrogen bonding, the latter was stronger, which was different from earlier studies. It can be explained that the conventional carboxylated microspheres do not have enough carboxyl groups on their surfaces. Adsorption constant K diminished as Nc increased, which means that the affinity itself is reduced by hydrogen bonding. Adsorbed layer thicknesses calculated from the Cm (adsorbed amount in equilibrium) were 4.66 ∼ 7.08 nm; this means that the BSA molecules exist between the side-on and end-on mode.

Original languageEnglish (US)
Pages (from-to)613-620
Number of pages8
JournalJournal of Colloid And Interface Science
Volume177
Issue number2
DOIs
StatePublished - Feb 10 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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