Main content area

Interactions of dietary fiber bound antioxidants with hydroxycinnamic and hydroxybenzoic acids in aqueous and liposome media

Çelik, Ecem Evrim, Rubio, Jose Manuel Amigo, Andersen, Mogens Larsen, Gökmen, Vural
Food chemistry 2019 v.278 pp. 294-304
2,2-diphenyl-1-picrylhydrazyl, antioxidant activity, antioxidants, coumaric acids, dietary fiber, hydroxybenzoic acids, lipid peroxidation, monitoring, synergism, wheat
The interactions between dietary fiber (DF)-bound antioxidants and free antioxidants, with different substitution patterns of –OH and –OCH3 groups on their aromatic rings has been investigated. The activity and efficiency of these interactions were examined with a structural approach. Whole wheat (WW) DF-bound antioxidants and 21 hydroxycinnamic acid/hydroxybenzoic acids (HCA/HBA) were used in the experimental studies. Studies were performed in liposome and aqueous media by monitoring lipid oxidation and scavenging of DPPH radical in the presence of WW-bound antioxidants and HCA/HBA derivatives. Predominantly synergistic interactions were observed in aqueous medium, while both synergistic and antagonistic interactions were seen in liposome medium. Concentrations of HCA/HBA and WW-bound antioxidants in mixtures and their 2-way interactions made significant effect on lipid oxidation and radical scavenging reactions, with some exceptions. HCA/HBA derivatives with 3 ,4 -dihydroxyphenyl substitution acted as strong antioxidants in liposome medium, while the number of –OH groups affected antioxidant activity in aqueous medium.