Determination of the oxidative stability of fats and oils: Comparison between the active oxygen method (AOCS Cd 12‐57) and the rancimat method

Läubli, Markus W.; Bruttel, P.

doi:10.1007/bf02541966

Cited by 319 publications

(186 citation statements)

References 6 publications

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“…It prescribes the Rancimat method [6,7] for gauging the induction time of the biodiesel. In this procedure autoxidation is accelerated by passing a constant flow of air through the biodiesel sample while controlling the temperature at an elevated level, i.e.…”

Section: Introductionmentioning

confidence: 99%

Biodiesel oxidative stability from Rancimat data

2016

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Highlights• Sunflower biodiesel was stabilized with a hindered phenol antioxidant.• Oxidative stability is defined by the length of the Rancimat induction period (IP).• A novel Rancimat response function allows automated IP determination.• IP follows an Arrhenius temperature dependence.• IP increased linearly with antioxidant concentration. AbstractIt is conventional to quantify the oxidative stability of oils and biodiesel through an induction time determined by a Rancimat instrument. European Standard EN 14112 for the Rancimat method describes two procedures for determining this induction period. The automated method relies on finding the position of the peak in the second derivative of the conductivity vs. time curve. The manual method is based on the intersection of two tangents lines. It is shown that this method can also be automated by a curve fitting approach based on a novel Rancimat response function. This analysis demonstrates that the induction period values determined by the two methods differ with the second derivative method returning slightly higher estimates for the induction period.Biodiesel was prepared using base-catalysed methanolysis of sunflower oil. It was stabilized using the hindered phenol antioxidant tetrakis[methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane. It was found that stability increases linearly with stabiliser concentration and that the effect of the measurement temperature follows Arrhenius kinetics. The effectiveness of the antioxidant stabiliser diminished with increasing temperature.

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Section: Introductionmentioning

confidence: 99%

Biodiesel oxidative stability from Rancimat data

2016

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“…The ability of the oil bearing thermal oxidation was also measured using Schaal oven A 679 Rancimat [Metrohm, Herisan, Switzerland] according to Läubli and Bruttel [16]. About 5g of oil was loaded into the reaction vessel cylinder.…”

Section: Rancimat Methodsmentioning

confidence: 99%

Effect of Synthesized ZnO Nanoparticles As Antioxidant on Cotton Seed Oil and Its Blend with Palm Olean

LI¹,

Atta²

2017

IJFS

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Nanoparticles of zinc oxide (ZnO NPs) using the precursor citrate was formed as a single phase one stage with the size of 25 nm. ZnO NPs was used at different concentrations (1, 2, 5 mML -1 ) in some edible oils [cotton seed oil and its blend with palm Olean in the ratio of 1:1 (v/v) during heat stress as antioxidant. Some of the chemical characteristics of the oil were estimated as an indicator of deterioration as a result of oxidation during thermal stress within two hours. The results revealed that chemical characteristics (e.g. PV, p-AV and Totox value) of oils that contained 1mML -1 ZnO NPs were not affected significantly compared to those free from ZnO NPs during heat stress. These results suggested that ZnO NPs has a potential power to control the oxidation process during heat stress of edible oil and could be used as synthetic antioxidant agent. More studies concerning the solubility of ZnO NPs and its nutritional effect on the animal lab are needed.

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“…(Herisau, CH-9101, Switzerland) connected to a receiving electrochemical cell was used in measuring the oxidative stability of oil at 100°C as describe by (Labulbi and Bruttel, 1986;Gordon and Mursi, 1994). Air rate 20 mL min −1 was injected into an oil sample (5 g) mixed with extracts dissolved in diethyl ether in concentration (0.2-0.4 and 0.5 µL) in a glass cylinder.…”

Section: Ajabsmentioning

confidence: 99%

Natural Antioxidant Ingredient From by-Products of Fruits

El-Baroty

Khalil²,

Mostafa³

2014

American Journal of Agricultural and Biological Sciences

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The contents of total phenolics compounds and their phenolic constituents were quantified in organic and aqueous of four varieties (Zebdia, Sukkari, taimor and Hindi) of mango (Mangifera indica L.), seeds pulp and kernel, one varieties of pomegranate (Punica ranatum L., peel) and peanut (Arachis hypogaea L., Giza 6, shell) by-products. The antioxidant activities of all by products extracts were assessed by five antioxidant methods as well as by rancimate test. The total Phenolic content of aqueous and organic extracts of among all mango varieties, pomegranate and peanut shell showed the content values ranging from 71.06 to 124.18 mg/100g, 95.07 to 124.18 mg/100g and 41.64 to 71.06, respectively. Nineteen phenolic compounds were identified by High Performance Liquid Chromatography (HPLC) among all mango varieties, of which vanillic acid, benzoic acid and mangiferin were occurred in high amounts. The major phenolic compounds were detected in pomegranate and peanut shell were chlorogenic and gallic and caffeic (24.42%), respectively. All fruits by products were exhibited remarkable antioxidant activity, with various degrees in all tested methods. However, among all by-products extracts, organic extract had higher antioxidant than that aqueous extracts toward all antioxidant tested. Mango kernel peel and pomegranates showed high radical scavenging activity, which could be compared with the synthetic antioxidants Butylated Hydroxyanisol (BHA). However, all by-products extracts exhibited high inhibit effect against the lipid peroxidation of sunflower oil (at 100°C) as assessed by rancimat methods. However, this antioxidant activity was found to be strong significant correlation with phenolic contents (p<0

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Determination of the oxidative stability of fats and oils: Comparison between the active oxygen method (AOCS Cd 12‐57) and the rancimat method

Cited by 319 publications

References 6 publications

Biodiesel oxidative stability from Rancimat data

Biodiesel oxidative stability from Rancimat data

Effect of Synthesized ZnO Nanoparticles As Antioxidant on Cotton Seed Oil and Its Blend with Palm Olean

Natural Antioxidant Ingredient From by-Products of Fruits

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