• 대한수의학회지
• /
• 제23권1호
• /
• pp.9-16
• /
• 1983

The effects of ethanol on Na-K-ATPase activity were investigated with cat kidney homogenate. The results were summarized as follows: 1. Na-K-ATPase activity was inhibited with dose-dependent manner by ethanol of higher concentration than 1%, and showed an estimated $I_{50}$ (the inhibitor concentration to cause 50% inhibition) of 7.5%. 2. Hydrolysis of ATP was linear with the incubation time in the absence and presence of 8% ethanol, whereas it was different with preincubation time in the presence of 15% ethanol. 3. Inhibition of Na-K-ATPase activity by ethanol was not affected by increased enzyme concentration, and showed the reversibility of the inhibitory pattern. 4. Kinetic studies of cationic-substrate activation of Na-K-ATPase showed that ethanol had both properties of classical competitive inhibition for $Mg^{{+}{+}}$ or $K^+ and non-competitive inhibition for ATP or $Na^+$. 5. Arrhenius plot yield two break point at $21^{\circ}$ and $30^{\circ}C$ in the absence of ethanol, whereas showing only one break point at $18^{\circ}C$ in the presence of 8% ethanol. These results suggested that ethanol inhibited Na-K-ATPase activity reversible through a disturbance of microenvironment of lipids associated with the enzyme.

• Toxicological Research
• /
• 제12권2호
• /
• pp.243-250
• /
• 1996

To evaluate an effect of ethanol pretreatment on the toluene metabolism, toluene (50% in olive oil) was given three times at 0.2 ml/100g body weight at the interval of one day to the rats fed with 5% ethanol during two months. The ethanol pretreated rats were not identified particular liver injury by the histopathologic findings. In case of toluene treatment, the ethanol pretreatment to the rats led to more increased concentration of urinary hippuric acid than those treated with only toluene. The ethanol pretreatment to the rats led to the increased activities of hepatic aniline hydroxylase and these enzyme activities were higher both in toluene treated and those pretreated with ethanol, but no differences were found in two groups. Ethanol pretreated rats showed the more increased activities of benzylalcohol dehydrogenase than control group. Moreover, the ethanol pretreatment to the toluene treated rats led to significantly more increased activities of benzylalcohol dehydrogenase compared with those treated with toluene only. Furthermore, the alcohol pretreatment to the toluene treated rats also led to somewhat higher activities of benzaldehyde dehydrogenase than those treated with toluene. In conclusion, these results indicate that the chronic pretreatment of ethanol at not so much liver damage as normal may rather activate the toluene metabolism.

• Preventive Nutrition and Food Science
• /
• 제9권3호
• /
• pp.245-252
• /
• 2004

This study investigated the effects of an ethanol extract of Allium monanthum MAX. (AME) on ethanol-induced hepatotoxicity in rat liver. Sprague-Dawley rats weighing 100～150 g, were divided into 5 groups; normal group (NOR), AME 200 mg/kg treated group (S1), ethanol (35%, 10 mL/kg) treated group (S2), AME 200 mg/kg and ethanol (35%, 10 mL/kg) treated group (S3) and AME 400 mg/kg and alcohol (35%, 10 mL/kg) treated group (S4). AME was fractionated by the following solvents: n-hexane, chloroform, EtOAC and n-BuOH. Antioxidant index of the n-BuOH fraction was 600 ppm, highest among fractions. The growth rate and feed efficiency ratio were decreased by ethanol, but gradually increased to the corresponding level of the normal group by administering AME. The serum ALT activities that were elevated by ethanol were significantly decreased by AME administration. It was also observed that the hepatic activities of SOD, catalase, xanthine oxidase and GSH-Px that were increased by ethanol were also markedly decreased in the AME treated group with compared to ETB. These results suggest that ethanol extracts of Allium monanthum MAX. may have a protective effect on ethanol-induced hepatotoxicity in rat liver.

• 한국식품영양과학회지
• /
• 제20권5호
• /
• pp.409-417
• /
• 1991

To investigate effects of chronic alcohol consumption and tocopherol on lipid peroxidation and mitochondrial respiration 48 male rats of Sprague-Dawley strain were divided into 4 groups. Each group received for 3 weeks one of 4 experimental diets: tocopherol deficient control (TDC), tocopherol deficient-ethanol (TDE), tocopherol-supplemented control (TSC) and tocopherol-supplemented-ethanol (TSE). Composition of the diets was based on the Lieber and Decarli liquid diet and $\alpha$-tocopherol was supplemented at the level of 30mg/liter of diet, and ethanol supplied 36kcal%. TDC and TSC were pair-fed to TDE and TSE, respectively. Increase of body weight of tocopherol deficient-ethanol group was the lowest and the effect was diminished with tocopherol supplementation. Respiration of liver mitochondria was depressed in ethanol-administered groups and the effect became larger with tocopherol deficiency. Hepatic lipid peroxide level was not influenced by ethanol, but hepatic tocopherol content decreased with ethanol treatment. The result indicated that, although lipid perroxide level was unchanged with chronic ethanol consumption, oxidative stress exists in tissues of rate administered ethanol and may be relieved by tocopherol supplementation.

• 대한약리학회지
• /
• 제30권2호
• /
• pp.217-225
• /
• 1994

In an attempt to define the effects of Biphenyldimethyl dicarboxylate(DDB) on the lipid peroxidation, oxygen free radical scavenging enzymes activities and hepatic functions in ethanol-induced hepatotoxic rats, we studies malondialdehyde(MDA) level and the activities of catalse, superoxide dismutase(SOD), glutamic-oxaloacetic transaminase(GOT) and glutamic-pyruvic transaminase(GPT) in liver of the rats at 24, 48 and 72 hr after the injection of ethanol and DDB. Sprague-Dalwey albino rats weighing 250 to 280gm were injected intraperitoneally with ethanol(2.5 gm/kg ) only and ethanol plus DDB(300mg/kg ). The result obtained can be summarized as follows : 1) The group treated with ethanol showed significantly higher MDA level and lower catalase and SOD activities at 24, 48 and 72hr after the injection as compared with that of control group. 2) The group treated with ethanol showed significantly higher GOT and GPT activities at 24, 48 and 72hr after the injection as compared with that of control group. 3) The group treated with ethanol plus DDB showed significantly lower MDA level and higher catalase and SOD activities at 24, 48 and 72 hr after the injection as compared with that of ethanol group. 4) The group treated with ethanol plus DDB showed significantly lower GOT and GPT activities at 24, 48 and 72 hr after the injection as compared with that of ethanol group. These results suggest that the excessive oxygen free radicals resulting from the depression of the activities of catalase and superoxide dismutase is an important determinant in pathogenesis of ethanol-induced hepatotoxicity and DDB has antioxidant effects.

• 대한약리학회지
• /
• 제25권1호
• /
• pp.87-91
• /
• 1989

본 실험에서는 ethanol 및 acetaldehyde가 유도하는 MAO 활성변동에 인삼 butanol 분획이 미치는 영향을 검토하였다. Ethanol(1 g/kg)을 mouse 복강내로 투여하였을 때 간장 중 MAO 활성이 현저히 증가하였으며 이러한 작용은 인삼butanol 분획 전처리로 개선되었다. 또한 pyrazole(200mg/kg)을 전처리하였을 때 ethanol에 의해 증가된 간장중 MAO활성이 정상수준으로 감소되었다. 만성적으로 ethanol을 투여한 경우에 있어서도 MAO활성이 증가되었으며 인삼 butaonl분획 전처리로 MAO 활성이 감소됨이 관찰되었다. Ethanol의 대사산물인 acetaldehyde(100mg/kg)을 복강내로 투여하고 관찰한 실험에서도 간장중 MAO활성이 현저하게 증가되었으며 인삼 butanol분획을 전처리함으로써 정상수준 가깝게 MAO활성이 감소되었다. 이 연구결과로 ethanol에 의한 간장중 MAO활성증가는 ethanol의 대사산물인 acetaldehyde에 기인된 것으로 생각되어지며 인삼 butanol분획이 acetaldehyde에 의해 유도되는 간장중 MAO활성 변동을 조절하고 있을 것으로 사료된다.

• Biomolecules & Therapeutics
• /
• 제24권4호
• /
• pp.433-437
• /
• 2016

Consumption of high doses of ethanol can lead to amnesia, which often manifests as a blackout. These blackouts experienced by ethanol consumers may be a major cause of the social problems associated with excess ethanol consumption. However, there is currently no established treatment for preventing these ethanol-induced blackouts. In this study, we tested the ethanol extract of the roots of Salvia miltiorrhiza (SM) for its ability to mitigate ethanol-induced behavioral and synaptic deficits. To test behavioral deficits, an object recognition test was conducted in mouse. In this test, ethanol (1 g/kg, i.p.) impaired object recognition memory, but SM (200 mg/kg) prevented this impairment. To evaluate synaptic deficits, NMDA receptor-mediated excitatory postsynaptic potential (EPSP) and long-term potentiation (LTP) in the mouse hippocampal slices were tested, as they are known to be vulnerable to ethanol and are associated with ethanol-induced amnesia. SM (10 and $100{\mu}g/ml$) significantly ameliorated ethanol-induced long-term potentiation and NMDA receptor-mediated EPSP deficits in the hippocampal slices. Therefore, these results suggest that SM prevents ethanol-induced amnesia by protecting the hippocampus from NMDA receptor-mediated synaptic transmission and synaptic plasticity deficits induced by ethanol.

• Journal of Microbiology and Biotechnology
• /
• 제20권4호
• /
• pp.828-834
• /
• 2010

An ethanol-producing yeast strain, CHFY0201, was isolated from soil in South Korea using an enrichment technique in a yeast peptone dextrose medium supplemented with 5% (w/v) ethanol at $30^{\circ}C$. The phenotypic and physiological characteristics, as well as molecular phylogenetic analysis based on the D1/D2 domains of the large subunit (26S) rDNA gene and the internally transcribed spacer (ITS) 1+2 regions, suggested that the CHFY0201 was a novel strain of Schizosaccharomyces pombe. During shaking flask cultivation, the highest ethanol productivity and theoretical yield of S. pombe CHFY0201 in YPD media containing 9.5% total sugars were $0.59{\pm}0.01$ g/l/h and $88.4{\pm}0.91%$, respectively. Simultaneous saccharification and fermentation for ethanol production was carried out using liquefied cassava (Manihot esculenta) powder in a 5-l lab-scale jar fermenter at $32^{\circ}C$ for 66 h with an agitation speed of 120 rpm. Under these conditions, S. pombe CHFY0201 yielded a final ethanol concentration of $72.1{\pm}0.27$ g/l and a theoretical yield of $82.7{\pm}1.52%$ at a maximum ethanol productivity of $1.16{\pm}0.07$ g/l/h. These results suggest that S. pombe CHFY0201 is a potential producer for industrial bioethanol production.

• 한국미생물·생명공학회지
• /
• 제19권4호
• /
• pp.319-324
• /
• 1991

섬유성 가수분해물로부터 효율적으로 ethanol을 생산하는 세 가지 균주를 밀기울 당화액에서의 집적배양에 의해 토양에서 분리하였다. 효모인 KM-09와 KM-402 및 세균인 HG-225의 생리학적 및 생화학적 특성은 각각 Candida sp. 및 Klebsiella sp.과 거의 유사하였다. KM-09와 HG-225 균주는 발효당으로 xylose와 cellobiose를 이용하였고 HG-225는 발효시 넓은 당 이용성을 가졌다.

• Journal of Ginseng Research
• /
• 제24권1호
• /
• pp.23-28
• /
• 2000

덱스트린/에탄올/물(1/1/l, w/w/w)의 혼합용액에 라우릴황산나트륨 0.5%(w/w) 및 홍삼 엑기스 20%(w/w)를 첨가한 조성을 가지고 분무건조하여 제조한 분말 홍삼주는 최대 에탄올(31.17$\pm$ 1.33%(w/w)) 및 ginsenoside Rbl(243.0$\pm$ 7.0$\mu\textrm{g}$/g)이 봉입된 미립구로서 용해 및 복용감이 우수한 새로운 홍삼 엑기스의 제형으로서의 가능성이 있다.