Abstract
Abstract The objective of this work was to evaluate the effect of Platymiscium floribundum ethanolic and chloroform extracts on the oxidative stability of soybean biodiesel using the Rancimat and DSC methods. The soybean biodiesel was obtained by transesterification. The antioxidant activity of the extracts was also evaluated by the free radical scavenging (DPPH) method and the total phenolic content by the Folin-Ciocalteu method. Both extracts showed antioxidant activity, reducing the DPPH by about 90%, and the total phenolic content of the ethanolic and chloroform extracts were 2.87 and 3.10 mg GAE/100 mg of extract, respectively. The extracts showed to be very efficient in retarding the oxidation of soybean biodiesel since the induction period increased from 4.53 h to 18.09 h (PF–EtOH, 10000 mg/kg) and 17.58 h (PF–CHCl3, 10000 mg/kg). Both extracts showed high thermal stability with Ton-e of 405.76 °C (PF–CHCl3) and 396.79 °C (PF–EtOH). The presence of the extracts increased the activation energy of the samples between 12.3% and 37.0%. The increase of the activation energy represents an improvement of the oxidative stability of biodiesel. All results confirmed the action of the antioxidants present in the extracts on controlling the oxidation reactions in biodiesel.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
