Mesoporous silica SBA-15, a new adsorbent for bioactive polyphenols from red wine.

The aim of this paper is to evaluate the ability of the mesoporous silica SBA-15 to adsorb polyphenols from red wine. The mesoporous molecular sieve silica SBA-15 was hydrothermally synthesized in acidic media and characterized by SAXRD, BET, EDX and SEM. The adsorption behavior of mesoporous silica SBA-15 was investigated at 5°C for 24h using an adsorbent dose of 8gSBA-15L(-1) red wine. The total polyphenols content expressed as mg of gallic acid equivalents (GAEL(-1)) was estimated from the standard curve of gallic acid (absorbance at 280 nm). HPLC chromatograms of methanolic extract from mesoporous SBA-15 at 256, 280, 324, and 365 nm exhibits the strong retention of quercetin and cis-resveratrol and a reasonable retention of trans-resveratrol, catechin, epicatechin, rutin, and phenolic acids (meta- and para-hydroxybenzoic, vanillic, caffeic, syringic, salicylic and para-coumaric acids). The obtained data showed that mesoporous silica SBA-15 was capable approximately to concentrate quercetin 4900 times and cis-resveratrol 1400 times. The verifiable diminution of polyphenolic compounds content in red and white wines avoid the oxidative browning process without modification of wine color. Due to their beneficial to human health thanks to antioxidative, antiinflamatory, antiviral, antihypersensitive, cardioprotective, anticarcinogenic and antimutagenic properties the polyphenolic extract might prove interesting as pharmaconutrients or as dietary sources.