Relationship between hydroxycinnamic profile with gelation capacity and rheological properties of arabinoxylans extracted from different maize fiber sources

The rheological properties and gelation capacity of arabinoxylans extracted from maize fiber (MFAX), resistant pericarp (RPAX), susceptible pericarp (SPAX) and nejayote (NEAX) were studied. The sugar and hydroxycinnamic acids profile of these extracts were previously characterized by Ayala-Soto, Serna-Saldívar, García-Lara, and Pérez-Carrillo (2014). A linear regression was established to study the relationship between hydroxycinnamic profile of arabinoxylans (AX) and their gel properties. Swelling capacity and Tan δ were directly proportional with the amount of ferulic acid (FA), and inversely proportional with dehydrotriferulic acid (tri-FA). For complex viscosity (η*) the relationship was inversed because higher values of complex viscosities (η*) were observed in gels containing higher and lower amounts of tri-FA and FA, respectively. According to these results, the percentage of tri-FA was the most important in AX gelation. For this reason, the MFAX gels with the higher percentage of tri-FA showed the most elastic behavior followed by RPAX, SPAX and NEAX gels.