Quantitation of Aging Products Formed in Biodiesel during the Rancimat Accelerated Oxidation Test

Flitsch, Stephanie; Neu, Philipp M.; Schober, Sigurd; Kienzl, Norbert; Ullmann, Jörg; Mittelbach, Martin

doi:10.1021/ef501118r

Cited by 45 publications

(39 citation statements)

References 12 publications

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“…In the accelerated oxidation process of lipid samples at high temperature and continuous air flow, according to the Rancimat procedure, the order of unsaturated chains reactivity is: linolenic (C18:3) > linoleic (C18:2) >> oleic (C18:1). 9,18,20,39,40 The fatty acid composition was found to be the most decisive factor in the oxidation of EVOO with palm oil blends by the Rancimat procedure, in which case the increase of the IP showed a linear correlation with the increasing palm oil content in the blends. This trend was correlated with the increase of the saturated fatty acids/ unsaturated fatty acids ratio.…”

Section: Resultsmentioning

confidence: 95%

“…The variation of the conductivity with time describes the curve used to determine the IP of the sample. 18,20 The samples were maintained under induced oxidation by Rancimat for the fixed time of 21 h, after which, the water contained in the Rancimat measurement vessel, where the conductivity is continuously measured, was analyzed by ion chromatography. The fixed time of 21 h was chosen, due to comparative purposes according to the data in Figure 1, where the majority of the samples showed an IP lower than 21 h. Therefore, during this time, the collected water for analysis is expected to contain a significant concentration of formic and acetic acids formed in the induced oxidation.…”

Section: Determination Of Evoo Modification Based On the Formic And Amentioning

confidence: 99%

“…18 The same approach was applied to biodiesel from soybean oil 19 and biodiesel from rapeseed oil. 20 In the induced oxidation equipment, known as the active oxygen method, 21 formic and acetic acids were identified as being the major components among the volatile acids determined during the degradation monitoring of soybean, peanut, rapeseed, corn, sunflower and olive oils. 22 The analytical methods that have been employed to determine formic and acetic acids in lipid samples include capillary electrophoresis 23 and ion chromatography.…”

Section: Introductionmentioning

confidence: 99%

“…22 The analytical methods that have been employed to determine formic and acetic acids in lipid samples include capillary electrophoresis 23 and ion chromatography. [18][19][20][24][25][26] In the present work, two methods were studied to determine the modification of EVOO with refined soybean oil. The first one was based on the IP, determined by Rancimat.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Extra Virgin Olive Oils Modified by the Addition of Soybean Oil, Using Ion Chromatography

Souza

Ansolin

Batista

et al. 2019

J. Braz. Chem. Soc.

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The modification of four extra virgin olive oils from different origins with refined soybean oil (SO), in the proportions of 0, 5, 10, 20 and 30% m/m, was studied using two approaches. First, the induction period (IP) was determined by Rancimat. In the second strategy, ion chromatography was used to quantify the formic and acetic acids, in their carboxylate forms (formate and acetate), present in the water contained in the measurement vessel of the Rancimat device, 21 h after the beginning of the induced oxidation of the samples. The content of the adulterant (SO) was linearly correlated with the IP (mean correlation coefficient (R) = 0.9858) and the concentration of the formate (mean R = 0.9979) and acetate (mean R = 0.9951). Also, it was observed that as the IP decreased and the formic acid and acetic acid concentrations increased, the monounsaturated fatty acids/polyunsaturated fatty acids ratio decreased.

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Section: Resultsmentioning

confidence: 95%

Section: Determination Of Evoo Modification Based On the Formic And Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Identification of Extra Virgin Olive Oils Modified by the Addition of Soybean Oil, Using Ion Chromatography

Souza

Ansolin

Batista

et al. 2019

J. Braz. Chem. Soc.

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“…Chuck et al [42] also explained that the oxidation BDs had the decreased intensities of unsaturated fatty acids by increasing the oxidation temperature and time. HPLC-APCI MS analysis of the oxidized linoleic acid (C18:2) methyl ester at 180 • C for 72 h in a sealed tube in air was performed to study the polymerization of FAMEs in BDs, because linoleic acid (C18:2) methyl ester accounts for high fractions in soybean (54.20%) and cottonseed (51.94%) BDs, and it can be polymerized by the Diels-Alder reaction at high temperatures [32,42,43]. Figure 7 shows the mass spectra for the fresh and oxidized linoleic acid (C18:2) methyl ester.…”

Section: Polymerization Of Famesmentioning

confidence: 99%

Effect of Accelerated High Temperature on Oxidation and Polymerization of Biodiesel from Vegetable Oils

et al. 2018

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Oxidation of biodiesel (BD) obtained from the decomposition of biomass can damage the fuel injection and engine parts during its use as a fuel. The excess heating of vegetable oils can also cause polymerization of the biodiesel. The extent of BD oxidation depends on its fatty acid composition. In this study, an accelerated oxidation test of BDs at 95 • C was investigated according to ASTM D 2274 by applying a long-term storage test for 16 weeks. The density, viscosity, and total acid number (TAN) of BDs increased because of the accelerated oxidation. Furthermore, the contents of unsaturated fatty acid methyl esters (FAMEs), C18:2 ME, and C18:3 ME in BDs decreased due to the accelerated oxidation. The 1 H-nuclear magnetic resonance spectrum of BDs that were obtained from the accelerated high temperature oxidation at 180 • C for 72 h differed from that of fresh BDs. The mass spectrum obtained from the analysis of the model FAME, linoleic acid (C18:2) methyl ester, which was oxidized at high temperature, indicated the formation of dimers and epoxy dimers of linoleic acid (C18:2) methyl ester by a Diels-Alder reaction.

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Solubility limitations of residual steryl glucosides, saturated monoglycerides and glycerol in commercial biodiesel fuels as determinants of filter blockages

Heiden¹,

Schober

Mittelbach

2021

J Americ Oil Chem Soc

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Newer, improved high pressure common rail diesel engines require increased protection from damaging particles in fuel, resulting in tighter, low-micron filtration requirements. The unobstructed flow of fuel through filters underlies the well-known efficiencies and reduced exhaust emissions of diesel engines, and when flows are hindered, these efficiencies become severely compromised. Biodiesel fuels frequently contain saturated monoglycerides, glycerol (GLY) and/or steryl glucosides, systemic impurities that become problematic when low concentrations exceed ill-defined solubility limits, usually unexpectedly at low temperatures. Here, filters and blended fuels from seven flow obstruction incidents were subjected to detailed compositional analyses. With one exception the fuels contain estimated levels within international specifications, yet exhibit heterophase (HP) formation in the laboratory at 2 C, well above measured cloud points. Feedstock composition, pretreatment and/or purification processes are found to modulate insolubility risks. Interferences in standard gas chromatography methods used without modification can hide or complicate estimates of residual levels of GLY. The data show that classical variables controlling solubility, such as concentrations and temperatures, play important roles in setting the risks associated with in situ formation of HPs from these common impurities. Further, such risks are likely attenuated considerably by reductions in critical impurities beyond currently specified limits.

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Quantitation of Aging Products Formed in Biodiesel during the Rancimat Accelerated Oxidation Test

Cited by 45 publications

References 12 publications

Identification of Extra Virgin Olive Oils Modified by the Addition of Soybean Oil, Using Ion Chromatography

Identification of Extra Virgin Olive Oils Modified by the Addition of Soybean Oil, Using Ion Chromatography

Effect of Accelerated High Temperature on Oxidation and Polymerization of Biodiesel from Vegetable Oils

Solubility limitations of residual steryl glucosides, saturated monoglycerides and glycerol in commercial biodiesel fuels as determinants of filter blockages

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