Interaction of bio-derived ferulic acid from wheat bran with zeolites seen by TPD-MS and FT-IR spectroscopy

B. PALIANYTSIA; E. ALONSO; T. KULIK; S. ASPROMONTE; M.V. PAZO-CEPEDA; N. NASTASIENKO

Kiev

Conferencia; Ukrainian Conference with International Participation "Chemistry, Physics and Technology of Surface"; 2019

Ferulic acid is the most abundant phenolic compound in cereals, and it has potential commercial applications in the health, food and cosmetic industries, mainly associated to its antioxidant, antimicrobial, anti-thrombosis and anti-cancer activities [1]. In the wheat bran matrix, its concentration is around ~0,5% wt. Around 99% of the ferulic acid is found in an insoluble bound form, cross-linked with lignin and polysaccharides via ester and ether bonds. This research is focused on the extraction and recovery of ferulic acid from wheat bran using different green hydrolysis strategies (Hot Pressurized Water, Ultrafast Supercritical Water, Microwave-assisted Hydrolysis, etc.) and selective adsorption of free ferulic acid from the wheat bran extracts on several commercial zeolites [2].In this work, temperature programmed desorption mass spectrometry (TPD MS) and FT-IR spectroscopy techniques were applied to identify the types of ferulic acid interactions with zeolites structures. Samples of ferulic acid on the surface of zeolites obtained by various methods, including adsorption from the hydrolyzed wheat bran extracts were investigated. The presence of several functional groups in the ferulic acid molecule (methoxy, carboxyl and phenolic groups) leads to the formation of several types of surface complexes. Complexes bonded via a phenolic group prevail on the surface at low concentrations. However, with increasing the surface concentration, the number of complexes bound through the carboxyl group increases.