Effect of Antioxidants and Metal Inactivators in Tocopherol‐Free Soybean Oil

Frankel, E. N.; Cooney, Patricia M.; Moser, Helen A.; Cowan, J. C.; Evans, C. D.

doi:10.1002/lipi.19590611046

Cited by 53 publications

(36 citation statements)

References 14 publications

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“…Special software determines the induction time (IT), i.e., the time when a maximum increase in electrical conductivity occurs in the cell being measured (maximum turning point of the time curve versus conductivity, determined by the second derivative). 38 DSC has also been reported as a technique for the rapid evaluation of the oxidative stability of biodiesel. The Oxidative Stability of Biodiesel and its Impact on the Deterioration of Metallic and Polymeric Materials J. Braz.…”

Section: Techniques For Evaluating the Oxidation Of Biodieselmentioning

confidence: 99%

“…In general, changes have been reported regarding the iodine, 13,14 peroxide, [15][16][17] and acid values, 14,16,18,20 as well as the viscosity, 14,15 methyl ester content, 20 oxidative stability 17 and contend of insoluble material. 38 Bouaid et al 14 evaluated the change in the iodine value (degree of unsaturation) in samples of biodiesel made from vegetable oils (sunflower and Brassica carinata) and waste oil, in a time period of 30 months, when exposed and not exposed to daylight. In general, all samples showed a decline in the initial iodine value, with this decline being sharper in the biodiesel samples with higher iodine values.…”

Section: Storage Stability Of Biodieselmentioning

confidence: 99%

“…Metal chelators are thus more effective than phenolic antioxidants at controlling the oxidative deterioration of soy bean oil that contains linolenate. 38 Antioxidant synergism is a process by which the antioxidant effect of multi-component systems is reinforced. Significant synergism is generally observed between free radical acceptor antioxidants and metal chelators.…”

Section: Effect Of Antioxidants On the Oxidative Stabilitymentioning

confidence: 99%

“…Antioxidant synergism is particularly important between natural tocopherols found in soy bean oil and metal chelators, such as citric acid, which are essential to ensure oxidative stability. 38 Another type of antioxidant synergism is produced by reducing agents such as ascorbic acid. 65 Natural antioxidants, such as carotenoids, can be found in biodiesel from the oils and fats from which the biodiesel is obtained, but their concentrations and effects vary depending on the transesterification process and the purification steps employed.…”

Section: Effect Of Antioxidants On the Oxidative Stabilitymentioning

confidence: 99%

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The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

Zuleta¹,

Baena

Ríos³

et al. 2012

J. Braz. Chem. Soc.

142

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O objetivo deste artigo é analisar as principais questões com relação às estabilidades oxidativa e de armazenamento de biodiesel e como elas afetam diferentes materiais metálicos e poliméricos presentes em peças de automóvel e em estruturas de armazenamento de biodiesel. Adicionalmente, este trabalho apresenta uma revisão das técnicas para a medição da estabilidade oxidativa e para avaliação da degradação de materiais metálicos e poliméricos. Quando biodiesel é oxidado, ocorre uma série de mudanças nas suas propriedades, tais mudanças afetam não só a qualidade do biodiesel, mas também as propriedades dos materiais que estão em contato com o biodiesel. Com a oxidação, propriedades do biodiesel como o índice de acidez, índice de peróxidos e viscosidade aumentam, entretanto os índices de iodo e teor de ésteres metílicos diminuem. As alterações das propriedades químicas e físicas do biodiesel podem afetar a integridade e a estabilidade dos materiais que estão em contato com o combustível. A atual situação relacionada com a estabilidade dos materiais revistos neste artigo poderia limitar o uso extensivo de biodiesel, como tem sido proposto em vários países, e deveria ser considerada como um fenômeno de grande importância na tecnologia de biodiesel.The purpose of this paper is to analyze the main issues concerned with the oxidative and storage stabilities of biodiesel and how they affect different metallic and polymeric materials present in automotive parts and in biodiesel storage structures. In addition, this work presents a review of the techniques used for measuring the oxidative stability and for evaluating the degradation of metallic and polymeric materials. When biodiesel is oxidized, a series of changes in its properties occurs. These changes not only affect biodiesel quality, but also the properties of the materials that are in contact with it. Upon oxidation, biodiesel properties like the acid value, peroxide value and viscosity increase, while the iodine value and the content of methyl esters decrease. The changes in the chemical and physical properties of biodiesel can affect the integrity and stability of the material. The situation reviewed in this paper, which talks about the stability of materials, could limit the extensive use of biodiesel. Such measures have been proposed in several countries, and it is a topic of great importance for biodiesel technology.

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Section: Techniques For Evaluating the Oxidation Of Biodieselmentioning

confidence: 99%

Section: Storage Stability Of Biodieselmentioning

confidence: 99%

Section: Effect Of Antioxidants On the Oxidative Stabilitymentioning

confidence: 99%

Section: Effect Of Antioxidants On the Oxidative Stabilitymentioning

confidence: 99%

See 2 more Smart Citations

The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

Zuleta¹,

Baena

Ríos³

et al. 2012

J. Braz. Chem. Soc.

142

View full text Add to dashboard Cite

show abstract

“…For the thermal oxidation of unsaturated fats two mechanisms have been postulated [10]: (a) thermal decomposition by direct interactions of radicals, when unsaturated fats are continuously heated at elevated temperatures, and (b) induced decomposition through the intermediacy of hydroperoxides, when unsaturated fats are subjected to intermittent heating. For measuring the oxidative stability of oils at elevated temperatures the Rancimat method can be used.…”

Section: Introductionmentioning

confidence: 99%

Stability of pumpkin seed oil

Murkovic

Pfannhauser

2000

Eur. J. Lipid Sci. Technol.

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Antioxidants: Science, Technology, and Applications

Wanasundara¹,

Shahidi²

2005

Bailey's Industrial Oil and Fat Products

109

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Antioxidants are compounds that are employed to enhance shelf life and preserve the quality of fats and oils and lipid‐containing foods by suppressing oxidation reactions of their unsaturated components. These compounds could be naturally present, deliberately added, or generated during processing. Antioxidants are needed in small quantities to participate or interfere in the lipid autoxidation reaction cascade via various mechanisms. They should not impart any undesirable characters to the food, they should be stable, and they should be nontoxic. Application of these antioxidation differs depending on the nature of the food, conditions of intended processing, and storage. However, antioxidants that are deliberately added to foods are thoroughly scrutinized for their safety and toxicology aspects. Their usage in food is regulated under different legislatures in various countries. This chapter examines the purpose of antioxidant use, chemistry of antioxidant activity, and natural synthetic compounds that exert antioxidative activity in foods, as well as the relevant technological, toxicological, and regulatory considerations.

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Effect of Antioxidants and Metal Inactivators in Tocopherol‐Free Soybean Oil

Cited by 53 publications

References 14 publications

The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

Stability of pumpkin seed oil

Antioxidants: Science, Technology, and Applications

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