• Food Science and Preservation
• /
• v.16 no.1
• /
• pp.75-81
• /
• 2009

Benzo(a)pyrene[B(a)P] levels were determined in processed oils and by-products of corn oil, and removal protocol was formulated. The cause of high level B(a)P contents in corn oil was established. Corn germ had a B(a)P level more than 80% that of whole corn. B(a)P content in final deodorized corn oil was $2.15{\mu}g/kg$, after the usual refining process. B(a)P contents less than $2.0{\mu}g/kg$ could not be attained by routine refining process. However, deodorized corn oil, with B(a)P level of $0.09{\mu}g/kg$, could be prepared by treatment of oil with approximately 2% (w/w) mixed granules(acidic clay:active carbon= 90:10[w/w]). The optimal amount of active carbon was 10% (w/w) that of acidic clay;higher levels of active carbon was not required. The optimal particle size of active carbon was $50{\sim}100$ mesh, removal of B(a)P from bleached corn oil was efficient at this mesh size.

• Journal of Nutrition and Health
• /
• v.24 no.6
• /
• pp.485-495
• /
• 1991

Using isolated perfused livers obtained from rats that have been fed saturated and unsatu-rated fatty acid diets the rates of hepatic microsomal oxidation of 7-ethoxycoumarin(EC) to 7-hydroxycoumarin(HC) and the rates of subsequent conjugation of the produced HC to its glucuronide and sulfate esters have been determined. Prior to preparing the isolated perfused livers. rats were fed either fat free diet 10% beef tallow diet or 10% corn oil diet for 3 weeks. The rates of oxidation from EC to HC and also of the subsequent glucuronidation of HC were higher in the corn oil diet group than those found for the fat free and beef tallow diet groups. When the concentrations of infusing EC were increased stepwise there was a dose-dependnet increase for the release of the glucuronide form of HC metabolites at the expense of the sulfate ester form. This dose dependant shift observed for the corn oil group was more significnat than those found for other groups. These results indicate that corn oil feeding has produced enhancement in the rates of hepatic microsomal drug oxidation and glucuronide conjugation the reactions catalyzed by enzymes embedded in the hepatic microsomal membranes.

• The Korean Journal of Food And Nutrition
• /
• v.26 no.4
• /
• pp.670-677
• /
• 2013

In this study, the effects of the intake of Prunus sargentii R. seed oil on the lipid levels of mouse blood were compared to the effects of commercially available corn oils. Mice from the same purchase lot were separated into 3 groups [control (n=5), corn oil-treated group (n=5), and Prunus sargentii R. seed's oil-treated group (n=5)] of equal size. The oil-treated groups of mice were fed their respective supplemented diets for a total of 8 weeks. Prunus sargentii R. seed oil is high in palmitic acid, oleic acid, and linoleic acid. The kidney weights of mice fed Prunus sargentii R. seed oil were higher than those fed corn oil (p<0.05). The HDL-cholesterol (high density lipoprotein cholesterol) levels in mice fed Prunus sargentii R. seed oil ($124.40{\pm}20.19$mg/dl) were higher than those of mice fed corn oil (p<0.05). The total cholesterol level was highest in mice fed Prunus sargentii R. seed oil, but the LDL-cholesterol (low density lipoprotein cholesterol) level was lowest in mice fed Prunus sargentii R. seed oil. Therefore, Prunus sargentii R. seed oil may be a good resource as a natural oil material.

• Journal of the Korean Applied Science and Technology
• /
• v.4 no.2
• /
• pp.63-69
• /
• 1987

This study is carried out to compare the quality of sesamin oil using to 52 restaurants in city with that of pure sesamin oil. The pure sesamin, corn soybean and perilla oils used reference oil commodities of famous corporations. The fatty acid, sesamin and sterols of reference and restaurant oils are analyzed by gas chromatography. The results are as follows; 1. A pure sesamin oil can be identified with the component and content of fatty acid, sterol and sesamin. 2. In 52 restaurant oils, 12 oils (23％) are estimated as pure sesamin oil and the remainders (77％) are mixed with corn oil, soybean oil an perilla oil. 3. The sesamin oil that is mixed with corn oil is 35％, soybean oil is 17％ and perilla oil is 15％.

• Proceedings of the Korean Society of Near Infrared Spectroscopy Conference
• /
• 2001.06a
• /
• pp.1521-1521
• /
• 2001

The objective of the research being presented was to construct and calibrate a spectrometer for the analysis of single kernels of corn. In light of the difficulties associated with capturing the spatial variability in composition of corn kernels by single-beam spectrometry, a hyperspectral imaging spectrometer was constructed with the intention that it would be used to analyze single kernels of corn for the prediction of moisture and oil content. The spectrometer operated in the range of 750- 1090 nanometers. After evaluating four methods of standardizing the output from the spectrometer, calibrations were made to predict whole-kernel moisture and oil content from the hyperspectral image data. A genetic algorithm was employed to reduce the number of wavelengths imaged and to optimize the calibrations. The final standard errors of prediction during cross-validation (SEPCV) were 1.22% and 1.25% for moisture and oil content, respectively. It was determined, by analysis of variance, that the accuracy and precision of single-kernel corn analysis by hyperspectral imaging is superior to the single kernel reference chemistry method (as tested).

• Journal of the Society of Disaster Information
• /
• v.18 no.3
• /
• pp.574-580
• /
• 2022

Purpose: As corn oil is semi-drying oil, it has more double bonds than non-drying oil and is easier to combine with oxygen. In addition, among the causes of spontaneous ignition, accidents caused by oil-soaked cloths due to oxidative heat are gradually increasing. Therefore, the purpose of this study is to understand the characteristics of spontaneous combustion according to the number of towels and the amount of corn oil at 65℃. Method: After setting the test temperature to 65℃, 25ml, 50ml, 75ml of corn oil per towel was sprayed. The central temperature of the sample rises above the set temperature. It was determined, and when the central temperature of the sample became similar to the set temperature, it was determined as non-igniting. Result: After evenly distributing 25ml of corn oil per towel, as a result of the experiment, 5 towels did not ignite, and 10 and 15 towels ignited. Also, as a result of an experiment using 50ml and 75ml of corn oil per towel, spontaneous ignition occurred when the number of towels was 5, 10, or 15 sheets. Conclusion: Even a small amount can cause a fire if the conditions for spontaneous ignition are met.

• Korean Journal of Food Science and Technology
• /
• v.36 no.1
• /
• pp.19-24
• /
• 2004

Effect of polyphenolic compounds from green tea leaves and surfactant micelles on lipid oxidation in corn oil-in-water emulsion (O/W) wag determined. Concentrations of polyphenolic compound and surfactant in continuous phase of O/W were measured. Particle size of O/W with 17 mM Brij 700 and 5% corn oil increased with increasing concentration of polyphenolic compound (100-200 ppm). Concentration of surfactant in the continuous phase was lower than that of control. Lipid oxidation rates, as determined by the formation of lipid hydroperoxides and headspace hexanal, in O/W emulsions containing polyphenolic compounds decreased with increasing concentration of polyphenolic compounds (100-200 ppm). Inhibition of hydroperoxide and headspace hexanal produced via lipid oxidation by polyphenolic compounds in O/W was BHT>procyanidin B3-3-O-gallate>(+)-gallocatechin >(+)-catechin.

• Journal of the Korean Applied Science and Technology
• /
• v.4 no.1
• /
• pp.91-97
• /
• 1987

Because of its more complete hydrolysis and rapid absorption, MCT is expected its usefulness in the diets of patients with malabsorption syndrom. Also, several authors reported that serum cholesterol level was lower after MCT feedings. In this study, rate of each experimental group were fed for 4weeks with 20％ MCT, 20％ corn oil, mixed diet of 10％ MCT and 10％ corn oil, mixed diet of 17％ corn oil and 3％ shortening. After experimental diet, it was measured to growth rate and serum cholesterol, triglyceride and phospholipid level. The results were as follows; 1. The body weight gain was the lowest in MCT group and others were lower than control group. 2. Serum total cholesterol level was the lowest in corn oil group and others were significantly lower than control group. Free cholesterol level was lower in all experimental groups than control group too. 3. Serum HDL-cholesterol level was significantly higher in all experimental groups than control group. 4. The ratio of VLDL, LDL-Cholesterol to HDL-Cholesterol was significantly lower in all experimental groups than control group. 5. Serum triglyceride level was higher in all experimental groups than control group. Serum phospholipid level was significantly in only mixed diet group of corn oil and shortening than control group. 6. The ratio of total cholesterol to phospholipid was significantly lower in corn oil diet group than control group.

• Journal of Nutrition and Health
• /
• v.25 no.5
• /
• pp.339-350
• /
• 1992

This study was performed to investigate the effect on polyunsaturate fatty acid diets and feeding periods on the antithrombosis. the hematological changes in the blood and fatty acid compositions of platelets in rats. Each group of rats was fed a diet containing 20%(W/W) corn oil beef tallow sardine oil and the general stock diet for 10, 20. 40 and 80 days. Rats fed sardine oil diet showed significantly longer bleeding time than any other diet groups after 20 days feeding The whole blood clotting time of sardine oil group fed for 80 days was increased significantly. The number of platelet and the concentration of hemoglobin showed no significant difference among all groups. The number of white blood cell was decreased continously in sardine oil group after 10 days feeding. The level of malondialdehyde generation during thrombin-induced aggregation of platelets was decreased continously in sardine oil grou after 20 days feeding. With regard to the composition of platelet fatty acid the ratio of eicosapentaenoic acid(EPA 20: 5 $\omega$-3) to arachidonic acid(AA 20:4 $\omega$-6) was increased in sardine oil group but decreased in corn oil groups and beef tallow groups with days. In conclusion the rats fed sardine oil diet for more than 20 days showed the fact that EPA induced the antithrombosis. the changes in number of white blood cell and the fatty acid composition of platelets.

• BMB Reports
• /
• v.36 no.3
• /
• pp.258-264
• /
• 2003

This study examined the effect of dietary polyunsaturated fatty acids (PUFA) that were supplemented with vitamin E on lipid peroxidation, glutathione-dependent detoxifying enzyme system activity, and lipogenic fatty acid synthase (FAS) expression in rat liver. Male Sprague-Dawley rats were fed semipurified diets containing either 1% (w/w) corn oil or 10% each of beef tallow, corn oil, perilla oil, and fish oil for 4 wk. Alpha-tocopherol was supplemented in perilla oil (0.015%) and fish oil (0.019%). Hepatic thiobarbituric acid reactive substances, an estimate of lipid peroxidation, were not significantly different among the dietary groups. The glutathione peroxidase, glutathione reductase, and glutathione S-transferase activities were all elevated by the polyunsaturated fats, especially fish oil. The activity of FAS was reduced in the polyunsaturated fat-fed groups in the order of fish oil, perilla oil, and corn oil. The mRNA contents decreased in rats that were fed the 10% fat diets, particularly polyunsaturated fats, compared with the rats that were fed the 1% corn oil diet. Similarly, the inhibitory effect was the greatest in fish oil. These results suggest that lipid peroxidation can be minimized by vitamin E; PUFA in itself has a suppressive effect on lipogenic enzyme.