Tephrosia Vogelii oil use in biodiesel production and its conservation with Syzygium jambolanum DC (jambul) extract
DOI:
https://doi.org/10.5433/1679-0375.2017v38n2p28Keywords:
Biodiesel, Jambul, TransesterificationAbstract
Tephrosia (Tephrosia Vogelii) is a legume that has about 8% oil plus rotenoids, which has been studied by several authors. This oil was analyzed in the seeds and used for transesterification of triglycerides providing glycerin and biodiesel as major products, which are a mixture of straight-chain alkyl esters. In transesterification, an excess of alcohol is used in molar ratios of 6: 1 for methanol and 9: 1 to 12: 1 for ethanol, and subsequent removal of glycerin. Jambul (Syzygium jambolanum), a fruit from the myrtaceae family that is widely grown due its use in ornaments and for their edible fruits, was employed as an antioxidant extract. The biodiesel obtained was subjected to the Rancimat test, a standard method approved by the European standard EN 14214 (2003) and the Brazilian norm RANP 07/08, aiming at analyzing the oxidative stability of biodiesel, where the minimum allowed value of induction is 6 hours. Fatty acid composition was measured by gas chromatography, kindly provided by Maringa State University (UEM). Jambul extract showed antioxidant activity by scavenging DPPH free radicals and the value of 44.15%, relative to Trolox. Total concentration of phenols in solutions diluted up to ten times was found to be 4.45 mg ml-1 of total phenolic contents. Rancimat test showed an induction period of 3.59 hours without the presence of antioxidant, indicating that the presence of this antioxidant was necessary. When Rancimat test was carried out in the presence of Jambul, an induction time of 8.2 hours was observed , suggesting the efficiency of the applied antioxidant, and showing great similarity to the values obtained from a biodiesel synthesized from soybean oil. Biodiesel from soybean oil without butylated hydroxytoluene (BHT) showed an induction time of 4.2 hours, while in the presence of Jambul extract the induction time obtained was of 7.1 hours. New alternatives to soybean oil for biodiesel production are increasingly demanded, and the oil from seeds of Tephrosia (Tephrosia vogelii) can possibly be used for this purpose. The antioxidant proved to be of great feasibility and applicability for conservation, and does not require large amounts to obtain a satisfactory and consistent result as required by legislation, since its obtainment is derived from natural sources.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2018 Semina: Exact and Technological Sciences
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The Copyright Declaration for articles published in this journal is the author’s right. Since manuscripts are published in an open access Journal, they are free to use, with their own attributions, in educational and non-commercial applications. The Journal has the right to make, in the original document, changes regarding linguistic norms, orthography, and grammar, with the purpose of ensuring the standard norms of the language and the credibility of the Journal. It will, however, respect the writing style of the authors. When necessary, conceptual changes, corrections, or suggestions will be forwarded to the authors. In such cases, the manuscript shall be subjected to a new evaluation after revision. Responsibility for the opinions expressed in the manuscripts lies entirely with the authors.
This journal is licensed with a license Creative Commons Attribution-NonCommercial 4.0 International.