Influence of medium quality for lipid oxidation and alpha-tocopherol concentration on the formation of oxidation products

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22330%2F23%3A43927775" target="_blank" >RIV/60461373:22330/23:43927775 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Influence of medium quality for lipid oxidation and alpha-tocopherol concentration on the formation of oxidation products

Popis výsledku v původním jazyce

Lipid oxidation is the most widely spread reaction together with the Maillard reaction in food. During the antioxidant activity study, the choice medium for oxidation is problematic. The medium should contain the minimum of naturally occurring antioxidants that change overall results (antioxidant activity of naturally occurring antioxidants is determined with added antioxidant), and also the fatty acid composition of the medium must also be suitable for lipid oxidation – the presence of polyunsaturated fatty acids is required.In this study, sunflower oil was chosen as the raw material suitable for lipid oxidation. Sunflower oil was converted to fatty acid methyl esters, and then distilled at low pressure and high temperature (105 and 135 ° C) to maximise the removal of naturally occurring antioxidants, mainly tocopherols. The degree of lipid oxidation was monitored at storage temperature 60 ° C with added alpha-tocopherol at concentrations of 0,75 and 1,5 mmol/kg by conjugated diene content, p-anisidine value, induction period (Rancimat) at 120 ° C, 9-oxononanoic acid methyl ester concentration.The medium for lipid oxidation, which was distilled at higher temperature (135 °C), contained an undetectable amount of naturally occurring tocopherols, but during distillation, secondary oxidative products (2-alkenals) formed to a great extent. The concentration of 0,75 mmol/kg of added alpha-tocopherol showed the maximum antioxidant effect, while the concentration of 1,5 mmol/kg of added alpha-tocopherol had a pro-oxidant effect.

Název v anglickém jazyce

Influence of medium quality for lipid oxidation and alpha-tocopherol concentration on the formation of oxidation products

Popis výsledku anglicky

Lipid oxidation is the most widely spread reaction together with the Maillard reaction in food. During the antioxidant activity study, the choice medium for oxidation is problematic. The medium should contain the minimum of naturally occurring antioxidants that change overall results (antioxidant activity of naturally occurring antioxidants is determined with added antioxidant), and also the fatty acid composition of the medium must also be suitable for lipid oxidation – the presence of polyunsaturated fatty acids is required.In this study, sunflower oil was chosen as the raw material suitable for lipid oxidation. Sunflower oil was converted to fatty acid methyl esters, and then distilled at low pressure and high temperature (105 and 135 ° C) to maximise the removal of naturally occurring antioxidants, mainly tocopherols. The degree of lipid oxidation was monitored at storage temperature 60 ° C with added alpha-tocopherol at concentrations of 0,75 and 1,5 mmol/kg by conjugated diene content, p-anisidine value, induction period (Rancimat) at 120 ° C, 9-oxononanoic acid methyl ester concentration.The medium for lipid oxidation, which was distilled at higher temperature (135 °C), contained an undetectable amount of naturally occurring tocopherols, but during distillation, secondary oxidative products (2-alkenals) formed to a great extent. The concentration of 0,75 mmol/kg of added alpha-tocopherol showed the maximum antioxidant effect, while the concentration of 1,5 mmol/kg of added alpha-tocopherol had a pro-oxidant effect.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

21101 - Food and beverages

Projekt

<a href="/cs/project/QK22010135" target="_blank" >QK22010135: Nové trvale udržitelné způsoby zpracování a využití tuzemských olejnin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů