Mesoporous carbide-derived carbon for cytokine removal from blood plasma

Porous carbons can be used for purification of bio-fluids due to their excellent biocompatibility with blood. Since the ability to adsorb a range of inflammatory cytokines within the shortest possible time is crucial to stop the progression of sepsis, the improvement of the adsorption rate is a key factor to achieving efficient removal of cytokines. Here, we demonstrate the effect of synthesis temperatures (from 600 degrees C to 1200 degrees C), carbon particle sizes (from below 35 mu m to 300 mu m), and annealing conditions (Ar, NH3, H-2, Cl-2, and vacuum annealing) that determine the surface chemistry, on the ability of carbide-derived carbons (CDCs) to remove cytokines TNF-alpha, IL-6, and IL-1 beta from blood plasma. Optimization of CDC processing and structure leads to up to two orders of magnitude increase in the adsorption rate. Mesoporous CDCs that were produced at 800 degrees C from Ti2AlC with the precursor particle size of <35 mu m and annealed in NH3, displayed complete removal of large molecules of TNF-alpha in less than an hour, with >85% and >95% TNF-alpha removal in 5 and 30 min, respectively.This is a very significant improvement compared to the previously published results for CDC (90% TNF-alpha removal after 1 h) and activated carbons. Smaller interleukin IL-6 and 1L-1 beta molecules can be completely removed within 5 min. These differences in adsorption rates show that carbons with controlled porosity can also be used for separation of protein molecules. (C) 2010 Elsevier Ltd. All rights reserved.