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Investigations on PD Characteristics of Thermal aged Palm and Corn Oil for Power Transformer Insulation Applications

  • Senthilkumar, S.;Karthik, B.;Chandrasekar, S.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1660-1669
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    • 2014
  • Partial discharge (PD) detection plays a major role in the life time assessment of liquid insulation in power transformers. Many research works are being carried out to replace conventional mineral oil insulation in transformers by vegetable oils. It is necessary to understand the PD characteristics of vegetable oils before recommending them as an alternate for mineral oil. In this paper, the breakdown strength and PD characteristics of palm and corn oil were investigated in both unaged and thermally aged conditions. Laboratory experiments were performed as per IEC test procedures. PD signals were measured using wide band detection system. Phase resolved PD pattern of vegetable oils and mineral oil were compared. Effect of increase in voltage stress on the PD pattern of palm and corn oil were studied. Time and frequency domain analysis of PD pulses at needle-plane electrode configuration was carried out. Statistical analysis of PD pattern i.e. skewness and shape parameter variations with respect to applied thermal stress were also carried out. From the results, it is observed that palm and corn oils have better breakdown strength and PD characteristics even under long-term thermal stress and hence they can be used for power transformer applications.

Changes in Benzo(a)pyrene Content During Processing of Corn Oil (옥수수 기름의 제조공정별 벤조피렌 함량 변화)

  • Kim, Duk-Sook;Lee, Keun-Bo
    • Korean Journal of Food Preservation
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    • v.16 no.1
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    • pp.75-81
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    • 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.

Effects of Dietary Lipid on Ethoxycoumarin Metabolism in Isolated Perfused Rat Liver (식이지질의 조절이 흰쥐 적출관류간장에 의한 Ethoxycoumarin 대사기능에 미치는 영향)

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

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The Effect of Prunus sargentii R. Seed Oil on the Lipid Profile in Serum in Mice (산벚나무(Prunus sargentii R.) 씨앗 기름의 섭취가 마우스의 혈중 지질 수준에 미치는 영향)

  • Choi, Kyung-Soon;Shin, Kyung-Ok;Kim, Yong-Hwan;Yoo, Il-Su;Jeong, Hun;Kim, Kyung-Sun;Lee, Jeong-Sill
    • The Korean Journal of Food And Nutrition
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    • v.26 no.4
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    • pp.670-677
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    • 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.

A Study on the Quality of Sesame Oil Using in Restaurant (음식점(飮食店)에서 사용중(使用中)인 참기름의 질적(質的) 평가(評價)에 관(關)한 연구(硏究))

  • Park, U-Shin;Kim, Song-Jeon;Lee, Yong-Ock
    • Journal of the Korean Applied Science and Technology
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    • v.4 no.2
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    • pp.63-69
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    • 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%.

Effect of Medium and Long Chain Triglyceride Diet on the Serum Lipids of Rats Fed with Cholesterol (중쇄(中鎖)와 장쇄지방(長鎖脂肪) 식이(食餌)가 Cholesterol급여(給與) 흰쥐의 혈청지질(血淸脂質)에 미치는 영향(影響))

  • Lee, Eun-Sook;Cho, Jeong-Soon
    • Journal of the Korean Applied Science and Technology
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    • v.4 no.1
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    • pp.91-97
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    • 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.

Effect of Polyphenolic Compounds from Green Tea Leaves on Production of Hydroperoxide for Lipid Oxidation in Corn Oil-in-Water Emulsion (녹차 페놀류가 corn oil-in-water emulsion의 산화 중 hydroperoxide 생성에 미치는 영향)

  • Cho, Young-Je;Kim, Byung-Gyu;Chun, Sung-Sook
    • Korean Journal of Food Science and Technology
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    • v.36 no.1
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    • pp.19-24
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    • 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.

Effects of Unsaturated Fatty Acid Diets Feeding PEriods on the Antithrombosis the Hematological Changes in the Blood and Fatty Acid Compositions of Platelets in Rats (불포화 지방산의 종류와 사육기간이 흰쥐의 항혈전 작용, 혈액구성 및 혈소판의 지방산 조성 변화에 미치는 영향)

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

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Suppression of Hepatic Lipogenic Enzyme by Dietary Fish Oil In Rat Hepatocarcinogenesis

  • Kim, Hye-Kyeong;Choi, Hay-Mie;,
    • Toxicological Research
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    • v.14 no.3
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    • pp.285-291
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    • 1998
  • This study was designed to examine the effects of polyundaturated fatty acid(PUFA) from different sourecs on hepatic lipogenic enzyme and peroxisomal ${\beta}$-oxidation in murine hepatocarcinogenesis initiated by diethylnitrodamine (DEN). Male Sprague-Dawley rats were fed one of three diets containing 10%(w/w)fat; fish oil-corn oil blended(FO), corn oil-beef tallow-fish oil blended(CF), or corn oil-beef tallow-perilla oil blended (CP), from the gestation period. At 10 weeks, animals were received a single inraperitoneal injection of DEN (200mg/kg body weight), were subjected to two-thirds partial hepatectomy 3 weeks later and were sacrificed 8 weeks after DEN initiation. The areas of placental glutathione S-transferase (GST-P) positive foci were significantly smaller in rats fed fish oil containing diets (FO and CF) than those fed CP diet. Fish oil feeding significantly decreased th activities of lipogenic enzyme. Rats fed fish oil containing diets (FO, CF) exhibited the lower fatty acid synthase (FAS) activity than those fed CP diet and FAS activity was positively correlated with areas of GSP-P positivie foci. Glucose-6-phophate dehydrogenase activity was the lowest and peroxisomal ${\beta}$-oxidation was stimulated in rats fed FO diet compared to other groups. It was also found that serum cholesterol was decreased in FO group. Therefore, the preventive effect against hepatocarcinogenesis and hypolipidemic effect of fish oil can be explained partly by suppression of the hepatic lipogenesis and by increase of peroxisomal ${\beta}$-oxidation.

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The Use of High-oil Corn in Young Broiler Chicken Diets

  • Kim, I.B.;Allee, G.L.
    • Asian-Australasian Journal of Animal Sciences
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    • v.16 no.6
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    • pp.880-883
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    • 2003
  • The objective of this study was to measure performance of young broiler chickens fed three varieties of high-oil corn (HOC 1, 2, and 3) compared with eight varieties of normal corn (NC). HOC varieties contained about 80% more oil than NC (average crude fat; 6.71% vs 3.72%) and about 29% more protein (average CP; 9.54% vs 7.38%). Each experimental diet was formulated with the same amount (55.205%) of each corn hybrid. Experiment 1 had by six dietary treatments (HOC1 and five NC varieties, 360 chickens) and Experiment 2 had five treatments (HOC2, HOC3, and three NC varieties, 250 chickens). In Exp. 1, for feed efficiency (F/G), the treatment contained HOC1 had better performance (p<0.05) than other NC varieties except NC5. As expected, there was no significant difference in average daily feed intake (p>0.05) among dietary treatments. The dietary treatment of HOC1 gave an improvement of 4.3% in F/G that came from 6% higher gross energy (GE) value of HOC1. Compared with Exp. 2, the dietary treatments contained HOC hybrids gave 4.4% higher F/G than NC dietary treatments, which came from a 5% increase in GE value. HOC varieties had superior nutrients content to NC for poultry, due to the fact that HOC contained higher concentrations of energy, protein, lysine, and methionine, thus improving growth and F/G.