scholarly journals Oxidative stabilization of corn oil with spinach extract

2019 ◽  
Vol 54 (4) ◽  
pp. 375-382
Author(s):  
M Tehseen ◽  
S Hina ◽  
Alim Un Nisa ◽  
A Ahmad
Keyword(s):  
Antioxidant Activity ◽  
Fatty Acid ◽  
Corn Oil ◽  
Spinacia Oleracea ◽  
Conjugated Dienes ◽  
Synthetic Antioxidants ◽  
Oxidative Stabilization ◽  
Anisidine Value ◽  
Spinach Extract ◽  
Conjugated Trienes

The present study was aimed to analyze the antioxidant activity of spinach (Spinacia oleracea) extract in oxidative stabilization of refined, bleached and de-odorized (RBD) corn oil (CO). Corn oil was supplemented with three different concentrations 600, 1200 and 1800 ppm of methanolic spinach extract and then stored at 25oC and 60oC. Different oxidation measuring parameters such as peroxide value (PV), free fatty acid (FFA) value, iodine value (IV), conjugated dienes (CD), conjugated trienes (CT) and para-anisidine value (PAV) were examined. The potency of spinach extract as natural antioxidant was found to be as effective as the synthetic antioxidants BHA and BHT used as standards and highest stabilization was observed in the order CO-1800>CO-1200>CO-BHT> CO-BHA>CO-600>CO-control. The results showed a significant effect of spinach extract in enhancing the oxidative stability of corn oil. Bangladesh J. Sci. Ind. Res.54(4), 375-382, 2019

scholarly journals Effects of microwave and conventional heating on the oxidative stability of corn oil enriched with different antioxidants

2019 ◽  
Vol 70 (4) ◽  
pp. 326
Author(s):  
A. Baştürk
Keyword(s):  
Antioxidant Activity ◽  
Fatty Acid ◽  
Reaction Rate ◽  
Corn Oil ◽  
Ascorbyl Palmitate ◽  
Conjugated Dienes ◽  
Conventional Heating ◽  
Rosemary Extract ◽  
Conjugated Trienes ◽  
Severe Deterioration

Four different corn oil samples including stripped (SCO, Control), refined (RCO), stripped corn oil enriched with rosemary extract (SCO+ROS) and ascorbyl palmitate (SCO+AP) were exposed to microwave (MWH) and conventional heating (CVH). For both heating methods, peroxide value (PV) and conjugated dienes increased at up to 230 °C, at which temperature hexanal (HEX) and conjugated trienes started to increase instead. Kinetic analysis revealed that PV and HEX formation were first ordered and the reaction rate among the samples was as follows: Control > SCO+ROS > RCO > SCO + AP for PV and SCO + ROS > RCO > SCO+AP > Control for HEX. The unsaturated fatty acid contents of CVH and MWH treated samples showed 9.5 and 12.9% reduction in SCO, while they were 2.9 and 7.7% in RCO, 3.6 and 6.1% in SCO + ROS, and finally 4.0 and 4.8% in SCO + AP. It was concluded that MWH led to a more severe deterioration and that the antioxidant activity of ROS was superior to that of AP for both heating methods.

scholarly journals The Use of Sage Oil Macerates (Salvia officinalis L.) for Oxidative Stabilization of Cod Liver Oil in Bulk Oil Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Agnieszka M. Hrebień-Filisińska ◽  
Artur Bartkowiak
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Total Content ◽  
Cod Liver Oil ◽  
Oxidative Stabilization ◽  
Oxidation Degree ◽  
Bulk Oil ◽  
Anisidine Value ◽  
Oxidative Processes ◽  
Salvia Officinalis L

The aim of the study was to investigate the antioxidant properties of sage oil macerates (M) in cod liver oil (CLO) during process oxidation catalyzed by UV radiation. CLO was not only subject to oxidative stabilization but also used as a solvent for active ingredients of sage. Macerates were obtained by combining the sage with CLO, homogenization, maceration, and filtration. The effect of different maceration times (0, 3, 6, 8, 10, 13, and 15 days) and different concentrations of macerate addition (5%, 10%, 25%, and 50%) on the CLO oxidation degree, which was determined by peroxide value (PV), anisidine value (AV), and Totox index, was evaluated. Additionally, the total content of polyphenols in macerates by the Folin-Ciocalteu method, antioxidant activity DPPH, and color was determined. The macerates showed antioxidant properties in CLO. The best effect was shown by the initial macerate (maceration time 0, M0), which in 25% concentration significantly inhibited oxidative processes in CLO. It was also characterized by high content of polyphenols and antioxidant activity of DPPH. Sage macerates can effectively inhibit oxidation of fish oils and prolong their durability.

scholarly journals The effect of dried herbs on the souring of sunflower oil

2012 ◽  
pp. 87-89
Author(s):  
Mária Kállai-Nagy ◽  
Mária Borbélyné Varga
Keyword(s):  
Antioxidant Activity ◽  
Iodine Value ◽  
Peroxide Value ◽  
Sunflower Oil ◽  
Synthetic Antioxidants ◽  
Anisidine Value ◽  
Totox Value

Many herbs have antioxidant activity, which can replace the use of potencionally harmful synthetic antioxidants. Sunflower oil fortified with eight different plants and stored at room temperatur in my experiment. Specified intervals with determination of peroxide value, FFA, iodine value, anisidine value and TOTOX value followed the quality of the sunflower oil.

scholarly journals Waste Pomelo (Citrus Maxima) Peels – A Natural Source of Antioxidant and Its Utilization in Peanut Oil for Suppressing the Development of Rancidity

2019 ◽  
Vol 7 (3) ◽  
pp. 800-806
Author(s):  
Sanjay Kumar ◽  
Inderjeet Singh ◽  
Deepika Kohli ◽  
Jyoti Joshi ◽  
Ritesh Mishra
Keyword(s):  
Antioxidant Activity ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Iodine Value ◽  
Maximum Yield ◽  
Storage Period ◽  
Peanut Oil ◽  
Anisidine Value ◽  
Pomelo Peel ◽  
Peel Extract

The antioxidant activity of pomelo peels was evaluated with different organic solvents. Minimum yield (11.1%) was obtained with chloroform +methanol (2:1), maximum yield (21.6%) with methanol whereas (15.9%) with ethanol and (12.7%) with hexane were observed. The maximum scavenging activity of (ethanolic pomelo peel extract) 88.8 % was observed at 14mg/ml concentration. Antioxidant activity of ethanolic pomelo peel extract was evaluated by calculating free fatty acid, iodine value and p-Anisidine value of peanut oil during 21 days of storage period at room temperature. Samples were drawn and analyze periodically after 7 days and after 21 days of storage, peanut oil containing 1500 and 2000 ppm pomelo peel extract, be revealed lower free fatty acid values (2.66, 2.15%), and p- anisidine value (6.6, 4.68) and higher iodine value (52.8, 51.46) than control peanut oil sample (free fatty acid 9.32%, p- anisidine value 9.85 and iodine value 33.9). From the results, it could be concluded that natural antioxidants extracted from pomelo peel could be added to fat and oil to increase their shelf life by preventing oxidative rancidity.

Relative Activities of Acetyl-CoA Carboxylase and Fatty Acid Synthetase in Chick Liver: Effects of Dietary Fat

1973 ◽  
Vol 51 (7) ◽  
pp. 1029-1033 ◽  
Author(s):  
Gregory I. Liou ◽  
W. E. Donaldson
Keyword(s):  
Fatty Acid ◽  
Corn Oil ◽  
Fatty Acid Synthetase ◽  
Basal Diet ◽  
Acetyl Coa Carboxylase ◽  
Acetyl Coa ◽  
Carboxylase Activity ◽  
Cytosol Fraction ◽  
Activity Concentrations

The specific activities of acetyl-CoA carboxylase and fatty acid synthetase were measured in the cytosol fraction of livers from chicks fed various levels of corn oil, cottonseed oil, corn-oil free fatty acids, or crude (79%) oleic acid. Activities of both enzymes were depressed by the addition of fat to a fat-free basal diet. The ratios of synthetase to carboxylase activity were greater than unity when up to 4% fat was fed, but less than unity when 8% or higher levels of fat were fed. The depressions of the activities of these enzymes appeared to be unrelated to the dietary level of linoleate. In in vitro experiments, 2 μM concentrations of palmityl-CoA or oleoyl-CoA depressed acetyl-CoA carboxylase activity. Concentrations of 20 μM of these acyl-CoA esters did not affect the activity of fatty acid synthetase.

scholarly journals Antioxidant Compounds from Microalgae: A Review

Marine Drugs ◽  
2021 ◽  
Vol 19 (10) ◽  
pp. 549
Author(s):  
Noémie Coulombier ◽  
Thierry Jauffrais ◽  
Nicolas Lebouvier
Keyword(s):  
Antioxidant Activity ◽  
Natural Products ◽  
Mode Of Action ◽  
Natural Antioxidants ◽  
Culture Conditions ◽  
Antioxidant Compounds ◽  
Oxygen Species ◽  
Synthetic Antioxidants ◽  
Metabolic Plasticity ◽  
The Right

The demand for natural products isolated from microalgae has increased over the last decade and has drawn the attention from the food, cosmetic and nutraceutical industries. Among these natural products, the demand for natural antioxidants as an alternative to synthetic antioxidants has increased. In addition, microalgae combine several advantages for the development of biotechnological applications: high biodiversity, photosynthetic yield, growth, productivity and a metabolic plasticity that can be orientated using culture conditions. Regarding the wide diversity of antioxidant compounds and mode of action combined with the diversity of reactive oxygen species (ROS), this review covers a brief presentation of antioxidant molecules with their role and mode of action, to summarize and evaluate common and recent assays used to assess antioxidant activity of microalgae. The aim is to improve our ability to choose the right assay to assess microalgae antioxidant activity regarding the antioxidant molecules studied.

scholarly journals The Effect of Enriched Daphnia sp. with Different Source of Oil on the Survival Rate and the Growth of Oreochromis niloticus Larvae

2007 ◽  
Vol 2 (1) ◽  
pp. 7 ◽  
Author(s):  
I. Mokoginta ◽  
Dedi Jusadi ◽  
T.L. Pelawi
Keyword(s):  
Fatty Acid ◽  
Survival Rate ◽  
Fish Oil ◽  
Oreochromis Niloticus ◽  
Acid Level ◽  
Corn Oil ◽  
Lipid Level ◽  
Font Size ◽  
Fatty Acid Level ◽  
Ad Libitum

<p class="MsoNormal" style="text-align: justify;"><span style="font-size: 11pt;" lang="in" xml:lang="in">ABSTRACT<br /></span></p><p class="MsoNormal" style="text-align: justify;"><span style="font-size: 11pt;" lang="in" xml:lang="in">This experiment was conducted to evaluate best source of oil to enriched <em>Daphnia</em> sp. before fed it to <em>Oreochromis niloticus</em> larvae. Four treatments were used in this experiment; first, <em>Daphnia</em> sp. without encrichment, second <em>Daphnia</em> sp. enriched with fish oil, third <em>Daphnia</em> sp. enriched with corn oil and the fourth <em>Daphnia</em> sp. enriched with coconut oil. Three days old larvae fed on <em>Daphnia</em> sp. with size of </span><span style="font-size: 11pt; font-family: Symbol;" lang="in" xml:lang="in"><span>£</span></span><span style="font-size: 11pt;" lang="in" xml:lang="in"> 0,5 mm at the first week and 0,6 – 1,0 mm as the second week of this experiment. Larvae fed on <em>Daphnia</em> sp. 5 times daily, <em>ad libitum</em>, for 14 days. Larvae was reared in the small cages (2,25 l), and all cages was placed in the aquarium. Larvae density was 48 larvae/l. This experiment showed that the lipid level in <em>Daphnia</em> sp. enriched with oil was higher than that of no enrichment <em>Daphnia</em> sp. The highest n3- fatty acid level was found in <em>Daphnia</em> sp. enriched with fish oil, and the highest n6- fatty acid level was found in <em>Daphnia</em> sp. enriched with corn oil. Larvae fed on <em>Daphnia</em> sp. enriched with oil have a higher relative growth rate than that fed on <em>Daphnia</em> sp. without enrichment. The highest survival rate of larvae was found by feeding them with <em>Daphnia</em> sp. enriched with corn oil (<em>p</em> &lt; 0,05).</span></p><p class="MsoNormal" style="text-align: justify;"><span style="font-size: 11pt;" lang="in" xml:lang="in">Key words : <em>Daphnia</em> sp., enrichment, larvae, <em>Oreochromis niloticus</em></span></p><p class="MsoNormal"><span style="font-size: 11pt;"> </span></p><h2 style="margin-top: 0cm; text-align: center;"><span style="font-size: 11pt;" lang="in" xml:lang="in">ABSTRAK</span></h2><p class="MsoNormal" style="text-align: justify;"><span style="font-size: 11pt;" lang="in" xml:lang="in">Penelitian ini dilakukan untuk mengevaluasi sumber minyak yang terbaik bagi pengkayaan <em>Daphnia</em> sp. sebelum diberikan ke larva ikan nila, <em>Oreochromis niloticus</em>. Ada 4 perlakuan dalam penelitian ini yaitu <em>Daphnia</em> sp. yang tidak diperkaya minyak; <em>Daphnia</em> sp. yang diperkaya minyak ikan; <em>Daphnia</em> sp. yang diperkaya minyak jagung; dan <em>Daphnia</em> sp. yang diperkaya minyak kelapa. Larva ikan nila, <em>Oreochromis niloticus </em>berumur 3 hari ditebar dalam hapa kecil (volume 2,25 l) sebanyak 48 ekor/l, dan seluruh hapa diletakkan dalam akuarium berukuran 100x50x40 cm. <em>Daphnia</em> sp. diperkaya terlebih dahulu dengan minyak sesuai perlakuan sebelum diberikan ke larva. Pada minggu pertama pemeliharaan larva, ukuran <em>Daphnia</em> sp. yang digunakan adalah </span><span style="font-size: 11pt; font-family: Symbol;" lang="in" xml:lang="in"><span>£</span></span><span style="font-size: 11pt;" lang="in" xml:lang="in"> 0,5 mm dan pada minggu ke dua 0.6 – 1.0 mm. <em>Daphnia</em> sp. diberikan sebanyak 5 kali dalam sehari secara <em>ad libitum</em> dan pemberian pakan dilakukan selama 14 hari. Hasil penelitian ini memperlihatkan bahwa kadar lemak <em>Daphnia</em> sp. yang diperkaya minyak lebih tinggi dari <em>Daphnia</em> sp. yang tidak diperkaya, dan hal ini berpengaruh pula pada kadar lemak tubuh larva. Kadar asam lemak –n3 tertinggi terdapat pada <em>Daphnia</em> sp. yang diperkaya minyak ikan dan kadar asam lemak –n6 tertinggi terdapat pada <em>Daphnia</em> sp. yang diperkaya minyak jagung. Larva yang diberi <em>Daphnia</em> sp. yang diperkaya dengan minyak mempunyai pertambahan bobot relatif dan tingkat kelangsungan hidup yang lebih tinggi dari larva yang diberi <em>Daphnia</em> sp. yang tidak diperkaya; dan tingkat kelangsungan hidup larva yang tertinggi dihasilkan oleh perlakuan pemberian <em>Daphnia</em> sp. yang diperkaya minyak jagung (P &lt; 0,05), walaupun pertumbuhan bobot relatifnya sama dengan perlakuan lainnya (<em>p</em> &gt; 0,05).</span></p><p class="MsoNormal" style="text-align: justify;"><span style="font-size: 11pt;" lang="in" xml:lang="in">Kata kunci : <em>Daphnia</em> sp., pengkayaan, larva, <em>Oreochromis niloticus</em></span></p>

scholarly journals Quality Characteristics and Standards for Sunflower Oil from Arad Agricultural Area

2011 ◽  
Vol 68 (2) ◽  
Author(s):  
Claudia MUREŞAN ◽  
Anca Mihaela DICU ◽  
Virgil CIUTINA ◽  
Dorina CHAMBRE ◽  
Claudiu URSACHI
Keyword(s):  
Fatty Acid ◽  
High Temperature ◽  
Peroxide Value ◽  
Sunflower Oil ◽  
Quality Characteristics ◽  
Conjugated Dienes ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Specific Absorbance ◽  
Conjugated Dienes And Trienes

The purpose of this study was to determine the unsaturated fatty acid compounds of studied oils, physico-chemical parameters, and the behavior of the four oil types during oxidation and heating. This is a part of a large study effectuated on Carnia sunflower hybrids, PR64H91, PR65A22 and PR64H45 obtained through cold pressing. We followed the evolution of the UV absorption correlated with the peroxide value. The peroxide value has been presented an increased value in the first 12 heating hours, but after this period of time, it has been decreased due to the high temperature instability of the early formed hydro-peroxides. The absorbance between 220-230 nm and the specific absorbance on 232 and 270 nm (characteristic of the conjugated dienes and trienes) have increased along the experiment period. The results were compared with those from regular sunflower oil.

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