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Item type:Publication, Access status: without files , Alginate aerogels carrying calcium, zinc and silver cations for wound care: Fabrication and metal detectionCalcium-alginate aerogels augmented with zinc and silver can provide the next generation superabsorbent medical devices for advanced wound care with high cell and tissue tolerability and controlled compound release rates during wound healing. In this study, we addressed the fabrication and metal detection of alginate-based aerogels with these immunoactive cations. All three cations were incorporated into the alginate aerogel, albeit in different quantities, due to different magnitudes of leaching during solvent exchange step; an effect not reported previously. Silver addition led to an increase in aerogel zinc content without influencing calcium incorporation. All three metal ions were released into supernatants upon swelling aerogels in aqueous solutions, comparable to those measured for common wound dressings in human and animal injury models. The in vitro bioactivity studies showed that Zn-enriched swelling supernatants were able to suppress NO production in stimulated RAW 264.7 macrophages, indicating an effective anti-inflammatory activity.Publicationtype: Journal Article339 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Adsorption properties of glucose and isomaltose on different BEA zeolites(2012-09); ; The adsorption properties of monosaccharide glucose and disaccharide isomaltose have been investigated on BEA zeolites with different moduli for a reaction-integrated adsorption system. For BEA-type zeolites from Süd- Chemie the moduli Si/AlD12.5, 75, and 225 were compared and showed a maximum for isomaltose adsorption on Si/Al D 75. Adsorption models of Langmuir and Toth were used for fitting of the detected data and compared. Equilibrium measurements at different temperatures allowed the calculation of the adsorption enthalpy. For module Si/Al D 75 adsorption enthalpy δhAd was -27:5 kJ mol-1 using Langmuir and -26:3 kJ mol-1 in the case of Toth's model. For glucose only -13:3 kJ mo-1 was obtained, indicating a weaker adsorption compared to isomaltose. For an enzymatic production system, BEA150 (Süd-Chemie) and HSZ-980HOA (Tosoh Corporation) were compared. The adsorption equilibrium constant Ki;L is 14:9mLg-1 on BEA 150 and 1:79mLg-1 on HSZ-980HOA. Hence, HSZ-980HOA shows a three-fold faster desorption, which was determined in desorption kinetics. Despite nearly identical loading under production conditions, BEA 150 reaches a yield of 64% for purification of isomaltose compared to 43% for HSZ-980HOA. © de Gruyter 2012.Publicationtype: Journal Article109