Bentonite as environmental frendly sorption material for sugar beet molasses purification

23rd International Symposium on Analytical and Environmental Problems, Szeged, Hungary, 9-10. October 201

Bentonite as environmental friendly sorption material for sugar beet molasses purification

Search for efficient, inexpensive and environmental friendly sorption material for application in the sugar industry was always been in the research focus. Bentonite as natural material with great affinity for binding inorganic and organic compounds could fulfill the previous requirements. This study investigates application of two different sodium-calcium bentonites (Claris p30 and Claris p50) as adsorbents in the purification of sugar beet molasses. BoxBehnken experimental design was employed and the effect of 3 independent variables pH (3, 5, 7), molasses dry substance (30, 40, 50°Bx) and bentonite suspension concentration (9, 15, 21 g/L) on the sugar beet molasses color and turbidity reduction were studied. Positive results regarding color reduction (22% with Claris p30 and 48% with Claris p50) and turbidity reduction (90% with Claris p30 and 99% with Claris p50) of sugar beet molasses were obtained upon treatment with corresponding bentonites indicating their applicability as environmental friendly adsorbents of non-sugars from the sugar industry

Effect of Chitosan as a Cross-Linker on Matrix Metalloproteinase Activity and Bond Stability with Different Adhesive Systems

The aim of the present study was to evaluate the effect of 0.1% chitosan (Ch) solution as an additional primer on the mechanical durability and enzymatic activity on dentine using an etch-and-rinse (E&R) adhesive and a universal self-etch (SE) adhesive. Microtensile bond strength and interfacial nanoleakage expression of the bonded interfaces for all adhesives (with or without pretreatment with 0.1% Ch solution for 1 min and air-dried for 5 s) were analyzed immediately and after 10,000 thermocycles. Zymograms of protein extracts from human dentine powder incubated with Optibond FL and Scotchbond Universal on untreated or Ch-treated dentine were obtained to examine dentine matrix metalloproteinase (MMP) activities. The use of 0.1% Ch solution as an additional primer in conjunction with the E&R or SE adhesive did not appear to have influenced the immediate bond strength (T0) or bond strength after thermocycling (T1). Zymography showed a reduction in MMP activities only for mineralized and demineralized dentine powder after the application of Ch. Application of 0.1% Ch solution does not increase the longevity of resin–dentine bonds. Nonetheless, the procedure appears to be proficient in reducing dentine MMP activities within groups without adhesive treatments. Further studies are required to comprehend the cross-linking of Ch with dentine collagen