AI Article Synopsis
- Two different calcium-rich bentonites from Greece and Turkey were analyzed using X-ray diffraction, thermal analysis, and solid-state NMR to understand their properties before and after activation with solid Na(2)CO(3).
- The activation process enhances the exchange of calcium ions (Ca²⁺) with sodium ions (Na⁺), primarily at the edges of the bentonite layers, which boosts their ability to adsorb bovine serum albumin (BSA), a model protein.
- A direct relationship was found between the level of Ca²⁺/Na⁺ exchange, the BSA adsorption strength, and the unfolding of the BSA protein structure.
Article Abstract
Two natural calcium-rich bentonites used for the removal of wine proteins, originating from Greece and Turkey, were studied by X-ray diffraction, thermal analysis, and solid state NMR, before and after activation by solid Na(2)CO(3). Exchange of Ca(2+) by Na(+) mainly occurs for cations located at the edge of layers and only weakly for interlayer cations. This Na(2)CO(3) activation process leads to an increased efficiency in the adsorption process of bovine serum albumin (BSA) used as a model protein for both bentonites. A direct correlation is observed between the extent of Ca(2+)/Na(+) exchange, the strength of adsorption of BSA, and the extent of unfolding of BSA backbone.
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| http://dx.doi.org/10.1021/jf0212237 | DOI Listing |
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