Autoxidation and yellowing of methyl linolenate

Kumarathasan, Rajkumar; Rajkumar, A. B.; Hunter, Norman R.; Gesser, H. D.

doi:10.1016/0163-7827(92)90005-4

Cited by 39 publications

(29 citation statements)

References 91 publications

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“…The rate of autoxidation depends on the presence of pro-oxidants (i.e., oxidising agents), antioxidants, temperature and the dissolved oxygen (Belhaj et al 2010). Oleic acid, as a monounsaturated acid, can be oxidised only at elevated temperatures, while polyunsaturated acids such as linolenic and linoleic acids undergo rapid oxidation even at room temperature (Kumarathasan et al 1992). Allyl hydroperoxides, chemical moieties containing both allyl (−CH = CH-CH 2 -) and hydroperoxide (−OOH) groups as in -CH = CH-CH(OOH)-, constitute the primary oxidation products.…”

Section: Oxidation Process Of Linseed Oilmentioning

confidence: 99%

“…Autoxidation is a chain reaction process, with radical intermediates (odd electron species) of polyunsaturated fatty acids involved in initiation, propagation and termination steps (van Gorkum & Bouwman 2005;Gunstone 1996;Kumarathasan et al 1992). A slow induction period often precedes a more rapid reaction (Gunstone 1996).…”

Section: Oxidation Process Of Linseed Oilmentioning

confidence: 99%

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Low temperature oxidation of linseed oil: a review

et al. 2012

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This review analyses and summarises the previous investigations on the oxidation of linseed oil and the self-heating of cotton and other materials impregnated with the oil. It discusses the composition and chemical structure of linseed oil, including its drying properties. The review describes several experimental methods used to test the propensity of the oil to induce spontaneous heating and ignition of lignocellulosic materials soaked with the oil. It covers the thermal ignition of the lignocellulosic substrates impregnated with the oil and it critically evaluates the analytical methods applied to investigate the oxidation reactions of linseed oil. Initiation of radical chains by singlet oxygen ( 1 Δ g ), and their propagation underpin the mechanism of oxidation of linseed oil, leading to the self-heating and formation of volatile organic species and higher molecular weight compounds. The review also discusses the role of metal complexes of cobalt, iron and manganese in catalysing the oxidative drying of linseed oil, summarising some kinetic parameters such as the rate constants of the peroxidation reactions. With respect to fire safety, the classical theory of self-ignition does not account for radical and catalytic reactions and appears to offer limited insights into the autoignition of lignocellulosic materials soaked with linseed oil. New theoretical and numerical treatments of oxidation of such materials need to be developed. The self-ignition induced by linseed oil is predicated on the presence of both a metal catalyst and a lignocellulosic substrate, and the absence of any prior thermal treatment of the oil, which destroys both peroxy radicals and singlet O 2 sensitisers. An overview of peroxyl chemistry included in the article will be useful to those working in areas of fire science, paint drying, indoor air quality, biofuels and lipid oxidation.

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Section: Oxidation Process Of Linseed Oilmentioning

confidence: 99%

Section: Oxidation Process Of Linseed Oilmentioning

confidence: 99%

Low temperature oxidation of linseed oil: a review

et al. 2012

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“…yellowing of drying oils, cf. Kumarathasan et al, 1992) and thereby alter the colour of the paint. The unambiguous identification of pigments through chemical fingerprinting is therefore necessary in order to ensure the original colour of old and ancient paint residues.…”

Section: Pigment Identificationmentioning

confidence: 98%

The oldest evidence of painted furniture from Sweden – The 12th century chair from Suntak

Löfgren

Isaksson

2012

Journal of Archaeological Science

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“…38 Polyunsaturated fatty acids, such as those present in vegetable oils, undergo rapid lipid oxidation even at room temperature. 39 Therefore, the relatively low stabilities observed for the vegetable oil microemulsions spiked with the higher Fe concentration can be attributed to the increased presence of prooxidant Fe 2+ /Fe 3+ cations. Consequently, the 3 h duration, during which the analytical signals for Fe in the microemulsion samples remained stable, was assumed to be adequate to perform the Fe quantification by application of the proposed direct analysis method.…”

Section: Microemulsion Stabilitymentioning

confidence: 99%

Microemulsion as Sample Preparation for Direct Flame Atomic Absorption Spectrometry (FAAS) Determination of Total Iron in Crude and Refined Vegetable Oils

Galuch¹,

Piccioli²,

Neto³

et al. 2017

J. Braz. Chem. Soc.

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This work proposed a novel, relatively low-cost and rapid analytical method using microemulsion as sample preparation to determine iron (Fe) in vegetable oils by flame atomic absorption spectrometry technique (FAAS). The vegetable oil microemulsions were obtained by mixing appropriate proportions of the crude and refined vegetable oil, Triton ® X-100, 1-propanol and nitric acid 50% (v v -1 ). Moreover, an external calibration method was established using aqueous Fe standards instead of expensive and unstable organometallic standards. The limits of detection and quantification were 0.40 and 1.3 mg kg -1 of oil, respectively. The accuracy was checked by recovery studies (with recoveries ranging 84-105%) and by Fe determination in digested vegetable oil samples by inductively coupled plasma optical emission spectrometry (ICP OES) as comparative procedure. The proposed analytical method was efficient to determine Fe in crude and refined vegetable oils from various vegetable sources, besides being suitable for routine analyses due to its simplicity.

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Autoxidation and yellowing of methyl linolenate

Cited by 39 publications

References 91 publications

Low temperature oxidation of linseed oil: a review

Low temperature oxidation of linseed oil: a review

The oldest evidence of painted furniture from Sweden – The 12th century chair from Suntak

Microemulsion as Sample Preparation for Direct Flame Atomic Absorption Spectrometry (FAAS) Determination of Total Iron in Crude and Refined Vegetable Oils

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