scholarly journals Effect of microwave heating of linseed oil on the formation of primary and secondary oxidation products

2011 ◽  
Vol 2 (4) ◽  
pp. 673-679 ◽  
Author(s):  
Mohamed Megahed
Keyword(s):  
Microwave Heating ◽  
Linseed Oil ◽  
Oxidation Products ◽  
Secondary Oxidation

scholarly journals Influence of storage and microwave heating on stability of soya spread lipids with linseed content

2012 ◽  
Vol 5 (1) ◽  
pp. 47-52
Author(s):  
František Kreps ◽  
Štefan Schmidt ◽  
Lenka Vrbiková ◽  
Lucia Szeifová ◽  
Lenka Tmáková ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Microwave Heating ◽  
Protective Factor ◽  
Linseed Oil ◽  
Essential Fatty Acids ◽  
Oxidation Products ◽  
Protective Atmosphere ◽  
Secondary Oxidation ◽  
Related Substances ◽  
And Storage

Influence of storage and microwave heating on stability of soya spread lipids with linseed content We have chosen to experiment with soya spreads containing linseeds, which enrich the spreads with essential fatty acids and valuable related substances. The soya spreads with linseeds represent an ideal combination for nutritionally valuable foods with health benefits. In this work we examined the influence of microwave heating and storage on stability of linseed oil and soya spread lipids. Industrially produced soya spreads (S1) with addition of 5, 7 and 10 % linseeds and linseed oil were stored without a protective atmosphere in refrigerator at 5 °C. The lipids of commercial soya spreads (S2) enriched with 2, 5 and 10 % ground linseeds and soya spread lipids (S2) without linseeds were microwave-heated. The data obtained from experiments have shown that the storing of linseed oil for 30 days in refrigerator has caused excess of the maximum acceptable peroxide value (Food Codex of SR). Microwave-heated lipids from commercial soya spreads (S2) enriched with 2 % ground linseeds have the best result of stability and protective factor, compared with lipids from 5 and 10 % linseeds enriching soya spreads (S2). After the 5, 10 and 20 min of microwave heating, the lipids of soya spread (S2) enriched with 2 % ground linseeds have the protective factor 1.02, 1.15 and 1.43 respectively, compared with lipids from soya spread (S2) without linseeds. The microwave heating for 5 min has been accompanied by a decreasing of hydroperoxides and by formation of secondary oxidation products.

scholarly journals Effect of heating on the oxidative stability of corn oil and soybean oil

2019 ◽  
Vol 70 (2) ◽  
pp. 303 ◽  
Author(s):  
R. Saeed ◽  
S. Naz
Keyword(s):  
Soybean Oil ◽  
Microwave Heating ◽  
Corn Oil ◽  
Acid Value ◽  
Oxidation Products ◽  
Chemical Degradation ◽  
Conventional Heating ◽  
Secondary Oxidation ◽  
Total Oxidation ◽  
Ft Ir

The effects of conventional and microwave heating on the oxidative properties of corn and soybean oil were evaluated. The results showed that acid value, peroxide value, oxidative indices, total oxidation value, and p-anisidine values changed significantly with the rise in temperature (p < 0.05). The peroxide and p-anisidine values for corn oil (PV: 50.670 meqO2/kg, p-AV: 8.248) were greater than soybean oil (PV: 41.694 meqO2/kg, p-AV: 7.566) for conventional heating. The peroxide and p-anisidine values for soybean oil (PV: 6.545 meqO2/kg, p-AV: 76.539) were greater compared to corn oil (PV: 5.074 meqO2/kg, p-AV: 65.360) for microwave heating. The results concluded that microwave heating had a greater impact on the chemical degradation of the fatty acids of the oil. The FT-IR spectra showed peak changes at 3743 cm-1 and 1739 cm-1 and confirmed the rancidity of the oils from microwave heating due to the formation of secondary oxidation products. It was concluded that corn oil showed more oxidative changes compared to soybean oil.

scholarly journals Impact of Tetrapeptide-FSEY on Oxidative and Physical Stability of Hazelnut Oil-In-Water Emulsion

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1400
Author(s):  
Chenshan Shi ◽  
Miaomiao Liu ◽  
Qinghua Ma ◽  
Tiantian Zhao ◽  
Lisong Liang ◽  
...  
Keyword(s):  
Particle Size ◽  
Physical Stability ◽  
Test System ◽  
Oxidation Products ◽  
Hazelnut Oil ◽  
Secondary Oxidation ◽  
Antioxidant Additive ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil In Water Emulsion

This study investigates the antioxidant behaviors of a hazelnut tetrapeptide, FSEY (Phe-Ser-Glu-Tyr), in an oil-in-water emulsion. The emulsion was prepared with stripped hazelnut oil at a ratio of 10%. O/W emulsions, both with and without antioxidants (FSEY and TBHQ), were incubated at 37 °C. The chemical stabilities, including those of free radicals and primary and secondary oxidation productions, along with the physical stabilities, which include particle size, zeta-potential, color, pH, and ΔBS, were analyzed. Consequently, FSEY displayed excellent antioxidant behaviors in the test system by scavenging free lipid radicals. Both primary and secondary oxidation products were significantly lower in the FSEY groups. Furthermore, FSEY assisted in stabilizing the physical structure of the emulsion. This antioxidant could inhibit the increase in particle size, prevent the formation of creaming, and stabilize the original color and pH of the emulsion. Consequently, FSEY may be an effective antioxidant additive to use in emulsion systems.

THE APPLICATION OF NATURAL AND SYNTHETIC ANTIOXIDANTS TO INCREASE THE OXIDATION RESISTANCE OF LINSeED OIL

2020 ◽  
Vol 13 (4(50)) ◽  
pp. 41-51
Author(s):  
I. P. Edimecheva ◽  
A. A. Sosnovskaya ◽  
O. I. Shadyro
Keyword(s):  
Ascorbic Acid ◽  
Kinetic Data ◽  
Room Temperature ◽  
Linseed Oil ◽  
Ascorbyl Palmitate ◽  
Natural Antioxidants ◽  
Oxidation Products ◽  
Free Access ◽  
Synthetic Antioxidants ◽  
Acid Esters

The effectiveness of several synthetic and natural antioxidants (AO) in inhibiting the oxidation of linseed oil has been studied. Under the conditions of accelerated oxidation at 100 °С, the values of the induction period of oxidation and stabilization factors of linseed oil in the presence of additives of known phenolic AOs, tocopherols, fat-soluble ascorbic acid esters and compositions based on them were determined. The data obtained indicate that ascorbic acid esters effectively inhibit the oxidation of linseed oil. The stabilizing effect of ascorbyl palmitate (AP) increases with an elevation in the content of α-linolenic acid in the oil and a decrease in the oxidative stability of the oil. One AP provided better stabilization efficiency than some known compositions based on it. Kinetic data on the accumulation of oxidation products in linseed oil with AP additives during the storage at room temperature and with free access of the air were obtained, demonstrating high inhibiting activity of AP under these conditions, which provides a possibility to increase the shelf life of the stabilized oil up to 18 months or more.

scholarly journals The Drop-in-Drop Encapsulation in Chitosan and Sodium Alginate as a Method of Prolonging the Quality of Linseed Oil

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1355 ◽  
Author(s):  
Szymon Mania ◽  
Robert Tylingo ◽  
Anna Michałowska
Keyword(s):  
Sodium Alginate ◽  
High Efficiency ◽  
Unsaturated Fatty Acids ◽  
Linseed Oil ◽  
Control Sample ◽  
Membrane System ◽  
Oxidation Products ◽  
Food Ingredients ◽  
Preservation Method

Nowadays, the encapsulation of sensitive products by various techniques has become popular as a promising preservation method. In particular, this applies to oils with a high content of unsaturated fatty acids and a high susceptibility to deterioration. This work presents the possibility of using a chitosan and sodium alginate in the form of a hydrogel membrane to protect food ingredients such as linseed oil, which is stored in an aquatic environment. The obtained results showed the high efficiency of the coaxial method encapsulation, which did not affect the quality of the oil measured after encapsulation. The greatest protective effect was observed in the linseed oil–chitosan membrane system, in which the primary and secondary oxidation products content were 88% and 32% lower than in the control sample, respectively. The smallest changes of the fatty acid profile, conjugated dienes, and trienes were observed in the chitosan capsules with linseed oil compared to the control sample.

Chemical lonization-mass spectrometry of secondary oxidation products from methyl linoleate and linolenate

Lipids ◽  
1986 ◽  
Vol 21 (5) ◽  
pp. 333-337 ◽  
Author(s):  
E. N. Frankel ◽  
W. E. Neff ◽  
R. D. Plattner
Keyword(s):  
Mass Spectrometry ◽  
Methyl Linoleate ◽  
Oxidation Products ◽  
Secondary Oxidation

scholarly journals Effects of various antioxidants on oxidative stability of anchovy (Engraulis encrasicolus) oil

2019 ◽  
Vol 36 (4) ◽  
pp. 367-372 ◽  
Author(s):  
Mehmet Gökhan Soydan ◽  
Fatime Erdoğan
Keyword(s):  
Fish Oil ◽  
Storage Period ◽  
The Other ◽  
Oxidation Products ◽  
Butylated Hydroxytoluene ◽  
Rosemary Extract ◽  
Control Group ◽  
Secondary Oxidation ◽  
Total Oxidation ◽  
Oil Storage

The aim of study was to investigate four commercial available antioxidants (groups A (300 mg propyl gallate (PG)+10 mg rosemary extract (RE)/1000 mg), B (240 mg butylated hydroxy anisole (BHA)+80 mg PG+80 mg citric acid (CA)/1000 mg), C (120 mg BHA+120 mg PG+50 mg CA)/1000 mg), D (150 mg butylated hydroxytoluene (BHT)+100 mg BHA+10 mg PG)/1000 mg) used to evaluate oxidation during the storage in fish oil. Antioxidants were added to the fish oil to determine which ones were most effective in preventing oxidation, and fish oil was stored in the amber bottles at room temperature (20 °C) for 90 days. The control group samples were stored under the same conditions and antioxidant was not added. To determine the effect of antioxidants, the recommended by the manufacturer dose of commercial antioxidant (1000 mg kg-1 fish oil) was used in the experimental groups. The formation of the primary and secondary oxidation products in fish oil storage trial was examined by conducting the peroxide value (PV) and p-anisidine value (AV) analyses. The total oxidation value (TOTOX) was calculated based on the PV and AV measurements. Minor changes were observed in the PV of the fish oil during the first 30 days. In the study, antioxidant added samples (groups B, C, D > 5 meq kg-1) were oxidized on the 45th day; on the other hand both control and group A oxidized on the 75th day. A possible prooxidative effect was seen for some of the antioxidants. There was a very little change secondary oxidation of fish oil and no significant effects of all four antioxidant groups on the changes of AV (<20) during the storage period (P>0.05). In addition TOTOX was calculated under GOED (<26) limit during the storage for 90 days. At the end of the study, control samples were not significantly different from the other samples with antioxidant-added. Due to the results obtained at the end of the 90-day study, it was found that none of the antioxidants were used efficiently in this study.

scholarly journals Thiamine in Lipid Systems vs. the Antioxidant Activity of Epigallocatechin Gallate and Caffeine

2021 ◽  
Vol 13 (9) ◽  
pp. 4644
Author(s):  
Justyna Piechocka ◽  
Krystyna Szymandera-Buszka
Keyword(s):  
Antioxidant Activity ◽  
Epigallocatechin Gallate ◽  
Oxidation Products ◽  
Model Systems ◽  
Thiamine Pyrophosphate ◽  
Thiamine Hydrochloride ◽  
Secondary Oxidation ◽  
Oxidation Degree ◽  
Thiamine Content ◽  
The Stability

The aim of this study was to determine correlations between the concentration of thiamine hydrochloride or thiamine pyrophosphate and the antioxidant activity of epigallocatechin gallate (EGCG) and caffeine, as well as thiamine stability. The study was conducted in model systems. Oxidation degree indices of soybean oil (peroxide value and anisidine value LAN) and concentrations of total thiamine were determined. To compare the dynamics of the changes in thiamine content during storage, half-life T1/2 was determined. There was a strong correlation between the stability of thiamine and the stability of the oil. Thiamine was particularly sensitive to secondary oxidation products. Higher losses of thiamine introduced in the form of thiamine pyrophosphate were found (4–6%). The addition of tea components increased fat stability and thus reduced thiamine losses. The dynamics of thiamine loss were found to be lower with EGCG than caffeine. The antioxidant activity of these components was significantly reduced when the content of thiamine (1.0–20.0 mg/100 g) was higher than the natural level in foods. In order to maintain thiamine stability and the high activity of the active tea ingredients, it is necessary to consider their simultaneous addition to the systems in concentrations that limit their interactions.

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