• Korean Journal of Microbiology
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• v.28 no.4
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• pp.351-363
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• 1990

A mutant was selected by NTG treatment of Mycobacterium sp. NRRL B-3805, which was capable of degrading plant sterol to androsta-4-ene-3, 17-dione and yields was higher than NRRL B-3805. Also this mutant produced androst-4-ene-3, 17-dione faster than NRRL B-3805. It described the mode of sitosteroidal degradation, and the interrelation between cell membrane and its attachment to substrate during the sterol degradation process by this mutant and it was compared with Mvcobacterium sp. NRRL B-3805.

• The Korean Journal of Food And Nutrition
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• v.10 no.4
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• pp.564-573
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• 1997

The addition of antioxidants to fats and oils is one of the most effective ways to prevent oxidation of lipids. The popularity of natural antioxidants has increased because of the possible toxicity of synthetic antioxidants. Common natural antioxidants, tocopherols, retard oxidation at ambient temperatures, but they are ineffective at retarding oxidation at frying temperatures. The need for the development of novel natural antioxidants which are effective at frying temperatures is obvious. Sterols present in vegetable oils and certain herbal plant extracts have been reported to have antioxidant properties. Some sterols have been shown to retard thermal changes at frying temperatures. All the sterol effective at preventing oxidation at frying temperatures have an ethylidene group in their side chain. These effects can be explained by the hypothesis that sterols with a structure that allows them to react with lipid free radicals to form relatively stable free radicals are effective as antioxidants. (Key words :natural antioxidants, sterols, ethylidene group, herbal plant extracts)

• Journal of Conservation Science
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• v.20
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• pp.31-42
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• 2007

The archaeological site of Nambuk-dong, Yongyu Island, Incheon which goes back to the Neolithic making it difficult to identify character of site, To get information for identifying utility and character of Open-Air Hearths within the finds, an organic residues analysis was conducted on soil and stone sample, sterol was analysis to determine the originality of archaeological sample, then percentage of fatty acid was identify the species of sample. As a result, it is assumed that No. 9, 10, 12 finds once had shellfish-related materials remain, No. 32 find seemed to have animal materials, No. 42, 43 finds were related to plant. In conclusion, it seems that open-air hearths of Yongyu Island had utility mainly related to making seafood.

• The Korean Journal of Pesticide Science
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• v.13 no.3
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• pp.171-176
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• 2009

In 2008, 110 isolates of Colletotrichum gloeosporioides were obtained from infected twigs of persimmon collected at Sangju and five fungicides (prochloraz manganese complex, tebuconazole, mancozeb+myclobutanil, fluquinconazole+prochloraz, and tebuconazole+tolyfluanid) were evaluated to determine their growth on fungicide-medium. Among them, the mycelial growth of 97.3 and 98.2% of isolates was inhibited over 91% in response to prochloraz ($250\;{\mu}g/m{\ell}$) and tebuconazole ($125\;{\mu}g/m{\ell}$), respectively, compared to untreated control. In response to mancozeb+myclobutanil, fluquinconazole+prochloraz, and tebuconazole+tolyfluanid, isolates of 96.4, 99.1 and 96.4% of them were inhibited by fungicides, respectively. Isolates showed the highest sensitivity to fluquinconazole+prochloraz among 5 fungicides. The correlation between tebuconazole and tebuconazole+tolyfluanid was higher (r=0.85).

• Journal of the Korean Society of Food Culture
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• v.19 no.4
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• pp.429-434
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• 2004

Diet effect of separated-purified phytosterol, obtained from soybean scum, in rats during 4 weeks was as follows. At this experiment, checking points were plasma lipids and glucose concentration as well as insulin level in plasma, pancreas and femur. Purity of above phytosterol was 68.3%, and composition was capesterol 21%, ${\beta}$-stigmasterol 62.3%, sitosterol 11.0% and unknowns 5.8%, respectively. Triglyceride, total cholesterol and phospholipids content was decreased as increasing of phytosterol amount($0{\sim}3%,\;w/w$). But excessive treatments more than 3% there was no any additional effect. From these experiment optimum amount of phytosterol level was around 3%(w/w). But phytosterol treating didn't show any effects on the changes of carbohydrate relative tissues like plasma glucose concentration as well as insulin level in plasma, pancreas and femur.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.9 no.3
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• pp.195-202
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• 1976

The present investigation was performed to find the lipid composition of the total lipids, the fatty acid components of the neutral lipids and the phospholipids, and the composition of sterols, from Spisula sachalinensis. The results obtained are as follows ; 1) The main components of the total lipids are phospholipids$(43.1\%)$, triglyceride$(36.2\%) $, and sterol $(10.3\%)$. 2) The phospholipids are mainly composed of phosphatidyl choline, phosphatidyl ethanols, mine, phosphatidal ethanolamine and phosphatidyl serine. 3) The main fatty acids of the neutral lipids, the ethanolamine phospholipids and choline phospholpids, are C20:5, C16:1, C16:0, C20:5, C18:0, C22:6 and C16:0, C20:5, C22:6, respectively. Oleic acid content of all fractions is very small compared with one of gastropoda lipids and fish oil. 4) Most of plasmalogen are present in the ethanolamine phospholipids and only trace of plasmalogen in the choline phospholipids. 5) Sterols to be found are 22-trans-norcholesta-5, 22-diene-$3\beta$-ol, 22-dehydrocholesterol, cholesterol, brassicasterol, 24-methylenecho-lesterol and $\beta-sitosterol$.

• Journal of the Korean Applied Science and Technology
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• v.31 no.2
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• pp.255-264
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• 2014

This study was performed to elucidate the biochemical mechanism of metabolism on reducing blood lipid, by oral administration of egg yolk in rats. A total of 36 Sprague Dawley male rats were randomized into four treatment groups, according to a randomized block design. Each group was further divided into three repeat cages, with each repeat cage comprising of 3 rats. The animals were orally administered with egg yolk once a day, while feeding the same purified pellet diet for 6 weeks. The four treatment groups were: C(control, saline 1.0 g), T1(pork belly oil 1.0 g), T2(egg yolk 1.0 g), T3(pork belly oil 1.0 g and egg yolk 1.0 g alternating every week). The measured parameters in each group are listed as follows in the order of highest to the lowest: daily average gain of body weight(T1>T3>T2>C); blood triglyceride and total cholesterol(T1>C>T3>T2) HDL-C (T2>C>T3>T1); and LDL-C (T1>T3>C>T2). AST and ALT, which are the index of liver function, were the highest in T1 but was lowest in T2. The weights of the liver, spleen, and kidney, except for the abdominal fat, showed no significant difference. The weight of abdominal fat was the highest in T1, but there were no significant difference among C, T2, and T3. The HMG-CoA reductase activity was the highest in T1 followed by T3, C but T2 was lowest. The daily fecal excretions of the total sterol, neutral sterol and acid sterol was highest in T2 but lowest in T1. The results of this study show that the egg consumption reduces the blood lipid through facilitation of fecal excretions of sterols and inhibition of enzyme activity in cholesterol biosynthesis, in the liver of animal and human.

• The Korean Journal of Mycology
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• v.4 no.1
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• pp.27-30
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• 1976

The carpophores of Daedaleopsis tricolor(Fr.) Bond. et Sing. which grows wildly in Korea were collected in the Gyeong Gi Province and extracted with chloroform and methanol. Four compounds were isolated from the extracted and two of these compounds were identified as ergosterol and stigmasterol by T.L.C., G.L.C. and chemical tests.

• The Korean Journal of Mycology
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• v.11 no.2
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• pp.97-98
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• 1983

The carpophores of Phallus impudicus collected at Gal-mae-ri in Gyeong-gi Province were subjected to chemical analysis for sterol constituents. The dried carpophores were homogenized and extracted with chloroform-methanol(2 : 1). After saponification of the dried extract, unsaponified components were obtained by ether extraction of the reaction mixture. A sterol fraction was separated by preparative TLC and from this fraction, ergosterol was identified by gas­chromatographic analysis with authentic sterols.

• The Korean Journal of Mycology
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• v.9 no.3
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• pp.153-155
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• 1981

Attempts were made to investigate on sterols of Cryptoporus volatus (Pk.) Hubb.. Its carpophores were collected in Gyeong Gi Province and extracted with a mixture of chloroform and methanol. From the extract eight spots were detected by T.L.C.. One of the spots was identified as ergosterol by T.L.C., G.L.C. and chemical tests.