Analysis of Two Bentonites of Enological Interest before and after Commercial Activation by Solid Na2CO3
- 6 June 2003
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Agricultural and Food Chemistry
- Vol. 51 (14), 4096-4100
- https://doi.org/10.1021/jf0212237
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 Na2CO3. Exchange of Ca2+ by Na+ mainly occurs for cations located at the edge of layers and only weakly for interlayer cations. This Na2CO3 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 Ca2+/Na+ exchange, the strength of adsorption of BSA, and the extent of unfolding of BSA backbone. Keywords: Bentonite; Na2CO3 activation; bovine serum albumin; X-ray diffraction; differential thermal analysis; thermogravimetry; NMRKeywords
This publication has 12 references indexed in Scilit:
- Direct Observation of Polylysine Side-Chain Interaction with Smectites Interlayer Surfaces through1H−27Al Heteronuclear Correlation NMR SpectroscopyLangmuir, 2002
- Small-Scale Fining Trials: Effect of Method of Addition on Efficiency of Bentonite FiningAmerican Journal of Enology and Viticulture, 2001
- Protein Adsorption by Bentonite in a White Wine Model Solution: Effect of Protein Molecular Weight and Ethanol ConcentrationAmerican Journal of Enology and Viticulture, 2001
- Conformational Changes of Bovine Serum Albumin Induced by Adsorption on Different Clay Surfaces: FTIR AnalysisJournal of Colloid and Interface Science, 2000
- Activation of Ca(OH)2 using Different Siliceous MaterialsEnvironmental Technology, 1999
- Kaolinite/Montmorillonite Resembles BeidelliteClays and Clay Minerals, 1994
- Adsorption and Conformation of Bovine Serum Albumin on Montmorillonite: Modification of the Balance between Hydrophobic and Electrostatic Interactions by Protein Methylation and pH VariationJournal of Colloid and Interface Science, 1994
- Role of electrostatic interactions inSaccharomyces cerevisiaeadhesion to the inner surface of champagne bottlesBiofouling, 1992
- Secondary structure of peptides. 3. Carbon-13 NMR cross polarization/magic angle spinning spectroscopic characterization of solid polypeptidesMacromolecules, 1983
- Charakterisierung der elektrischen Eigenschaften und der Molmassen der Eiweißstoffe von WeißweinenMolecular Nutrition & Food Research, 1983