Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions
Bio-oils employed for various industrial purposes, such as biodiesel production, undergo extensive oxidation and degradation during transformation processes. Therefore, it is extremely important to predict their stability at high temperature. We report herein a new procedure based on the optically d...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Antioxidants |
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| Online Access: | https://www.mdpi.com/2076-3921/9/5/399 |
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| author | Fabio Mollica Marco Lucarini Cinzia Passerini Claudio Carati Silvia Pavoni Lucia Bonoldi Riccardo Amorati |
| author_facet | Fabio Mollica Marco Lucarini Cinzia Passerini Claudio Carati Silvia Pavoni Lucia Bonoldi Riccardo Amorati |
| author_sort | Fabio Mollica |
| collection | DOAJ |
| description | Bio-oils employed for various industrial purposes, such as biodiesel production, undergo extensive oxidation and degradation during transformation processes. Therefore, it is extremely important to predict their stability at high temperature. We report herein a new procedure based on the optically detected profile of headspace O<sub>2</sub> concentration during isotherms at 130 °C for evaluating the oxidation kinetic parameters of several bio-oil feedstocks. The slope of O<sub>2</sub> consumption and the induction period duration were related to the oil characteristics (molecular structure, acidity, and presence of intrinsic antioxidants or metals). The increase of the induction time caused by a standardized propyl gallate addition yielded a semiquantitative value of radical generation rate. Investigated oils included used cooking oils; mono-, di-, and triglycerides from natural sources; free fatty acids; transesterified oils; and their blends. With respect to other methods, this characterization presents the advantage of disentangling and evaluating the role of both fatty acids composition and naturally occurring antioxidants, and allows the development of rational strategies for antioxidant protection of oils and of their blends. |
| first_indexed | 2024-03-10T19:57:03Z |
| format | Article |
| id | doaj.art-031290d03a414b8f851d3c57b75ec51a |
| institution | Directory Open Access Journal |
| issn | 2076-3921 |
| language | English |
| last_indexed | 2024-03-10T19:57:03Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Antioxidants |
| spelling | doaj.art-031290d03a414b8f851d3c57b75ec51a2023-11-19T23:50:15ZengMDPI AGAntioxidants2076-39212020-05-019539910.3390/antiox9050399Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative ReactionsFabio Mollica0Marco Lucarini1Cinzia Passerini2Claudio Carati3Silvia Pavoni4Lucia Bonoldi5Riccardo Amorati6Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, ItalyDepartment of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, ItalyResearch and Technological Innovation Department, Eni SpA, Via F. Maritano 26, I-20097 San Donato Milanese, ItalyResearch and Technological Innovation Department, Eni SpA, Via F. Maritano 26, I-20097 San Donato Milanese, ItalyResearch and Technological Innovation Department, Eni SpA, Via F. Maritano 26, I-20097 San Donato Milanese, ItalyResearch and Technological Innovation Department, Eni SpA, Via F. Maritano 26, I-20097 San Donato Milanese, ItalyDepartment of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, ItalyBio-oils employed for various industrial purposes, such as biodiesel production, undergo extensive oxidation and degradation during transformation processes. Therefore, it is extremely important to predict their stability at high temperature. We report herein a new procedure based on the optically detected profile of headspace O<sub>2</sub> concentration during isotherms at 130 °C for evaluating the oxidation kinetic parameters of several bio-oil feedstocks. The slope of O<sub>2</sub> consumption and the induction period duration were related to the oil characteristics (molecular structure, acidity, and presence of intrinsic antioxidants or metals). The increase of the induction time caused by a standardized propyl gallate addition yielded a semiquantitative value of radical generation rate. Investigated oils included used cooking oils; mono-, di-, and triglycerides from natural sources; free fatty acids; transesterified oils; and their blends. With respect to other methods, this characterization presents the advantage of disentangling and evaluating the role of both fatty acids composition and naturally occurring antioxidants, and allows the development of rational strategies for antioxidant protection of oils and of their blends.https://www.mdpi.com/2076-3921/9/5/399oxidative stabilitybiodieselinduction periodpropyl gallateoil mixturesantioxidant |
| spellingShingle | Fabio Mollica Marco Lucarini Cinzia Passerini Claudio Carati Silvia Pavoni Lucia Bonoldi Riccardo Amorati Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions Antioxidants oxidative stability biodiesel induction period propyl gallate oil mixtures antioxidant |
| title | Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions |
| title_full | Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions |
| title_fullStr | Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions |
| title_full_unstemmed | Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions |
| title_short | Effect of Antioxidants on High-Temperature Stability of Renewable Bio-Oils Revealed by an Innovative Method for the Determination of Kinetic Parameters of Oxidative Reactions |
| title_sort | effect of antioxidants on high temperature stability of renewable bio oils revealed by an innovative method for the determination of kinetic parameters of oxidative reactions |
| topic | oxidative stability biodiesel induction period propyl gallate oil mixtures antioxidant |
| url | https://www.mdpi.com/2076-3921/9/5/399 |
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