Caffeic and ferulic acids: An investigation of the effect of antioxidants on the stability of soybean biodiesel during storage

- Improve on the oxidative stability of soybean biodiesel.
- Accelerated methods indicate same tendency against oxidation of biodiesel samples.
- Ferulic acid and TBHQ has lower antioxidant activity than caffeic acid.
- Caffeic acid maintains induction period of biodiesel during storage.