Synthesis, characterization and evaluation of antioxidant activity of tyrosol derivatives from olive mill wastewater

Abstract

The use of biophenols to synthesize antioxidants has greatly developed due to their capability of solving environmental problems, economical reasons and renewability. In the present work, the tyrosol derived from olive mill wastewater (OMWW) was alkylated to improve its utilization. The synthesized antioxidants were characterized by nuclear magnetic resonance (NMR) and CHN analyses. To study their thermal behavior, thermogravimetry analysis (TGA) and derivative thermogravimetry (DTG) techniques were employed. Antioxidant action of these compounds in gasoline sample was investigated by accelerated oxidation and induction period tests. Induction period results show the best stability time (188 min) at 10 ppm concentration of synthesized antioxidant in a gasoline sample. Reduction of carbonyl and peroxide band areas indicates the good antioxidant activity of these compounds (1.0% concentration) in the gasoline. Considering what was mentioned above, easy synthesis method and using bio-based material provide a highly efficient antioxidant to inhibit the oxidative process of gasoline.