![]() The physical and chemical principles-those of ion-exchange-are at work in these synthetic materials and in bentonite. Synthetic ion-exchange materials, such as resins developed for bio-tech once-through, packed-bed process operations, have shown reasonable affinity and capacity for wine proteins in model wine solutions at bench-scale. These data can be used to inform the design and scale-up of ion-exchange columns for removing proteins from wines.įining agents, which can be regenerated and reused, can be developed to remove wine proteins more efficiently by reducing the time required and minimizing wine loss. At low equilibrium protein concentrations ( ~0.3 (g BSA)/L), likely as a result of Macro-Prep ® acting as an unrestricted multilayer adsorbent at these conditions. The pH (hydronium ion concentration), ethanol concentration, and prototypical phenolics and polysaccharide compounds are known to impact interactions with proteins and thus could alter the adsorption affinity and capacity of Macro-Prep ® High S ion-exchange resin. We systematically changed concentrations of individual chemical components to generate and compare adsorption isotherm plots and to quantify adsorption affinity or capacity parameters of Macro-Prep ® High S ion-exchange resin. ![]() A model wine system, which contained a prototypical protein Bovine Serum Albumin (BSA), was used. ![]() The impact of key classes of compounds found in wine on protein removal by the ion-exchange resin, Macro-Prep ® High S, was examined by adsorption isotherm experiments.
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