Silica mesoporous materials -an efficient sorbent for wine polyphenols separation

Abstract

Highly ordered-pore SBA-15 was synthesized by co-condensation of tetraethylorthosilicate (TEOS) and 3-aminopropyltriethoxysilane (APTES) using an amphiphilic block copolymer as structure-directing agent. The BET, EDX, TGA-DSC and SEM analysis have been used for sorbent characterization. The adsorption properties of the calcined mesoporous silica SBA-15 material appears to be a consequence of the silanol groups presence that are active sites for adsorption, were evaluated in the clarification process of two types of red wines. The purpose of this study was the investigation of the total polyphenols content (reduction), the selectivity and stabilization for some compounds (phenolic acids, epicatechin, and catechin) and the chromatic characteristics of wine. HPLC chromatograms exhibit the retention of quercetin and trans-resveratrol, catechin, epicatechin, rutin, and phenolic acids. The decrease in the polyphenolic compounds content in red wines avoids the oxidative browning process without modification of wine color. Due to their beneficial to human health thanks to antioxidative, antiinflamatory, antiviral, cardioprotective, anticarcinogenic and antimutagenic properties the polyphenolic extract might prove interesting as pharmaconutrients or as dietary sources.