The 2,2-diphenyl picrylhydrazyl (DPPH) method, which can be used to predict the oxidative stability of edible oils, was previously reported by our research group. Not only free radical scavenging antioxidants but also radicals from oxidized oils are capable of reacting with DPPH radicals, thereby reducing the absorbance of DPPH. In this study, the optimum sample size of edible oils for the DPPH method was determined, and the oxidation of the edible oils was monitored via DPPH, coupled with other conventional methods. The optimum sample size was determined as 1.5 g using soybean oil. Soybean, corn, virgin olive, and refined olive oils were thermally oxidized for 3 hr at $180^{\circ}C$ and analyzed via DPPH, conjugated dienoic acid (CDA) value, and p-anisidine value (p-AV) protocols. Soybean and corn oils were found to be more sensitive to thermal oxidation than virgin and refined olive oils, on the basis of the CDA value and p-AV measurements. The DPPH method can indicate the inherent radical scavenging activity of unoxidized samples, the time required for the depletion of antioxidants, and the rate of degradation of the antioxidants. The soybean and corn oils evidenced higher levels of free radical scavenging compounds, required more time for the consumption of inherent antioxidants, and also manifested steeper antioxidant degradation rates than olive oils, based on the results of DPPH analysis. The DPPH method, accompanied by other conventional methods, may prove useful in predicting the degree of oxidation of vegetable oils.
Son, Jin Won;Jung, Ji Yun;Kim, Kwang-Youn;Hwangbo, Min;Park, Chung A;Cho, IL Je;Back, Young Doo;Jung, Tae Young;Kim, Sang Chan;Jee, Seon Young
Herbal Formula Science
/
v.25
no.4
/
pp.509-526
/
2017
Background and objectives : Soeumin Bojungykgi-tang (seBYTE) has been used to supplement qi in Korean medicine. It has been demonstrated to possess various biological functions such as anti-cancer, anti-aging and anti-inflammatory effects. The present study evaluated the protective roles of seBYTE in hepatotoxic in vitro and in vivo model. Methods : To investigate cytoprotective effect of seBYTE, HepG2 cells were pretreated with seBYTE and then subsequently exposed to $10{\mu}m$ AA for 12 h, followed by $5{\mu}m$ iron. Cell viability was examined by MTT assay, and expression of apoptosis-related proteins was evaluated by immunoblot analysis. For responsible molecular mechanisms, ROS production, GSH contents, and mitochondrial membrane potential were measured. In addition, hepatoprotective effect of seBYTE in vivo was assessed in $CCl_4$-induced animal model. Results : seBYTE prevented AA + iron-induced cytotoxicity in concentration dependent manner. In addition, ROS production, GSH depletion, and mitochondrial dysfunction induced by AA + iron were significantly reduced by seBYTE pretreatment. Furthermore, seBYTE recovered expression of the pro-apoptotic proteins such as PARP and pro-caspase-3. In animal experiment, plasma ALT and AST levels were significantly elevated in $CCl_4$ treatment, but seBYTE significantly decreased the ALT and AST levels. Moreover, seBYTE alleviated the numbers of histological activity index, percentages of degenerative regions, degenerated hepatocytes, infiltrated inflammatory cells, nitrotyrosine- and 4-hydroxynonenal-positive cells in liver. Conclusions : These results showed that hepatoprotective effect of seBYTE against on $CCl_4$-induced hepatic damages is partly due to antioxidative and anti-apoptotic process.
Journal of the Korea Organic Resources Recycling Association
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v.24
no.4
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pp.11-20
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2016
Depletion of natural resources and reduction of greenhouse gas emissions are an important issue which we have to solve. The recycling of waste has emerged as a global concern. In Korea, the development of cost-effective treatment and recycling technologies also need to be improved. In this study, we compared and analyzed the cost per unit of treatment and recycling of organic waste, and presented an effective recycling scheme. We investigated the current status of treatment and costs for six types of organic wastes from 80 workplaces, including organic wastewater treatment sludge, processed organic sludge, and plant residues. In addition, environmental costs for greenhouse gas reduction were calculated. It's an economic way that organic waste is composted and used as cement additives. In particular, the economic analysis was done by realistic results of the survey target companies. In conclusion, in order for reliable processing and recycling of organic wastes, wastewater treatment sludge and sewage sludge need to be classified based on hazard characteristics. Finally, technical difficulties need to be further resolved such as odors, leachate, and debris on recycling organic wastes.
Yousef, Amany I;El-Masry, Omar S;Abdel Mohsen, Mohamed A
Asian Pacific Journal of Cancer Prevention
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v.17
no.2
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pp.743-748
/
2016
Background: $K^-Ras$ activation is an early event in colorectal carcinogenesis and associated mutations have been reported in about 40% of colorectal cancer patients. These mutations have always been responsible for enhancing malignancy and silencing them is associated with attenuation of tumorigenicity. Among downstream effectors are the RAF/MEK/ERK and the PI3K/Akt signaling pathways. PI3K/Akt signaling leads to reduction of apoptosis, stimulated cell growth and enhanced proliferation. Ellagic acid (EA), a naturally occurring antioxidant, has recently emerged as a promising anti-cancer agent. Purpose: To evaluate the impact of cellular genetic makeup of two colon cancer cell lines with different genetic backgrounds, HCT-116 ($K^-Ras^-/p53^+$) and Caco-2 ($K^-Ras^+/p53^-$), on response to potential anti-tumour effects of EA. In addition, the influence of $K^-Ras$ silencing in HCT-116 cells was investigated. Materials and Methods: Cellular proliferation, morphology and cell cycle analysis were carried out in addition to Western blotting for detecting total Akt and p-Akt (at Thr308 and Ser473) in the presence and absence of different concentrations of EA. Cell proliferation was also assessed in cells transfected with different concentrations of $K^-Ras$ siRNA or incubated with ellagic acid following transfection. Results: The results of the present study revealed that EA exerts anti-proliferative and dose-dependent pro-apoptotic effects. Cytostatic and cytotoxic effects were also observed. p-Akt (at Thr308 and Ser473) was downregulated. Moreover, EA treatment was found to (i) reduce $K^-Ras$ protein expression; (ii) in cells transfected with siRNA and co-treated with EA, pronounced anti-proliferative effects as well as depletion of p-Akt (at Thr308) were detected. Conclusions: Cellular genetic makeup ($K^-Ras^-/p53^-$) was not likely to impose limitations on targeting EA in treatment of colon cancer. EA had a multi-disciplinary pro-apoptotic anti-proliferative approach, having inhibited Akt phosphorylation, induced cell cycle arrest and showed an anti-proliferative potential in HCT-116 cells (expressing mutant $K^-Ras$).
Chong Chul Yook;Gee Yang Han;Byung Jin Jun;Ji Bok Lee;Chang Kun Lee
Nuclear Engineering and Technology
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v.13
no.4
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pp.264-276
/
1981
A simulation procedure which can represent time-dependent nuclear characteristics of TRIGA Mark-III reactor is developed. CITATION, a multi-group diffusion-depletion program, has been utilized as calculational tool. The group structure employed in this study consists of 7 groups: -3-fast and 4-thermal-which is conventionally utilized in TRIGA type reactor analysis. Three-dimensional nuclear characteristics are synthesized by combining results from two-dimensional plane calculation and two-dimensional cylinder calculation, since direct three-dimensional approach is not yet possible. An effort ia made to develope a method which can extract effective zone and group dependent bucklings by neutron diffusion theory rather than conventional zone and/or group independent Ducklings by neutron transport theory, since neutron leakage is quite high for small core such as research reactors. It is turned out that the method developed in this study gives satisfactory results. The calculation is performed under assumptions that all control rods are fully withdrawn, that no samples are inserted in the irradiation holes and that the core is located in the center of the reactor pool. Burnup-dependent variation of core excess reactivity, time dependent change of Xe-135 poisoning and reactivity worth of rotary specimen rack are calculated and compared with operation records. Neutron flux and power distribution as well as neutron spectrum in each irradiation .facility are presented.
The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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v.24
no.1
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pp.142-170
/
2011
Objective : The purpose of this study is to investigate dizziness of Plain Questions $\ll$素問$\gg$ and Miraculous Pivot $\ll$靈樞$\gg$. Methods : We conducted a study on the original text paragraphs of Internal Classic $\ll$內經$\gg$ containing the dizziness and analysis of Yang, Ma, Zhang, Wang etc. We drew a parallel between dizziness from Internal Classic $\ll$內經$\gg$and matching diagnoses from western medicine. Results : The results were as follows. 1. Dizziness in Ok Ki Jin Jiang Ron <玉機眞藏論> and Pyo Bon Byeong Jeon Ron <標本病傳論> had relation to liver and was similar to dizziness caused by tension, hypertension, anemia and cerebrovascular accident etc. in western medicine. 2. Dizziness in Ja Yeol<刺熱>, O Sa<五邪> and Hai Ron<海論> had relation to kidney and was similar to dizziness caused by aging and peripheral vertigo concurrent with tinnitus and difficulty in hearing in western medicine. 3. Dizziness in O Sa<五邪> had relation to heart(pericardium) and was similar to dizziness caused by cardiac output loss and psychogenic dizziness in western medicine. 4. In Internal Classic $\ll$內經$\gg$ the main etiology of dizziness was infirmity(虛), which were Qi(氣) of the upper portion of the body being insufficient(上氣不足), blood depletion(血枯), deficiency of marrow-reservoir(髓海不足) etc. 5. In Dae Hok Ron<大惑論> etiology and pathogenesis of dizziness were mentioned and dizziness was similar to dizziness caused by eye disorder, psychogenic dizziness and central dizziness in western medicine. 6. In Internal Classic $\ll$內經$\gg$ the meridian of acupuncture points which was used much for dizziness was Bladder Meridian. Aqupunture points used in treatment of dizziness were Ch'onju(天柱), Kollyun(崑崙), Taejo, Chok-t'ongkok(足通谷) etc. Conclusion : We found out etiology, pathogenesis, treatments of dizziness in Internal Classic $\ll$內經$\gg$. Further we compared with western medicine to develop better understanding of dizziness.
Kim, Jae Kwang;Park, Sang Mi;Jegal, Kyung Hwan;Kim, Young Woo;Byun, Sung Hui;Kim, Sang Chan;Cho, Il Je
The Korea Journal of Herbology
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v.30
no.4
/
pp.57-64
/
2015
Objectives : Oxidative stress is one of the most causes of hepatocyte injury. Gleditsia spina, the thorns ofGleditsia sinensisLam., has been known for its anti-cancer and anti-inflammatory effects in Korean medicine. The present study investigated hepatoprotective effect of Gleditsia spina water extract (GSE) against oxidative stress induced by arachidonic acid (AA) + iron in HepG2 cells.Methods : To investigate cytoprotective effect of GSE, cells were pretreated with GSE and then subsequently exposed to 10 μM AA for 12 h, followed by 5 μM iron. Cell viability was monitored by MTT assay, and expression of apoptosis-related proteins was examined by immunoblot analysis. To identify responsible molecular mechanisms, reactive oxygen species (ROS) production, GSH contents, and mitochondrial membrane potential were measured. In addition, effect of GSE on nuclear factor erythroid 2-related factor 2 (Nrf2) activation was determined by immunoblot and antioxidant response element (ARE)-driven reporter gene assays.Results : GSE pretreatment prevented AA + iron-mediated cytotoxicity in concentration dependent manner. In addition, ROS production, glutathione depletion, and mitochondrial impairment by AA + iron were significantly inhibited by GSE. Furthermore, GSE promoted translocation of Nrf2 to nucleus, which acts as essential transcription factor for induction of antioxidant genes. Increased nuclear Nrf2 that caused by GSE treatment promoted transcriptional activity of ARE. Finally, GSE up-regulated sestrin-2 which was widely recognized as target gene of Nrf2.Conclusions : This study demonstrates that GSE protects hepatocytes from oxidative stress via activation of Nrf2 signaling pathway.
Deep-drilled core sampling and high-resolution seismic survey were carried out to identify a Holocene-late Pleistocene boundary in Gyeonggi Bay, western coast of Korea. Analysis of core sections revealed the existence of an oxidized and semi-consolidated sediment layer, Iying immediately below a Holocene horizon (Unit I) and being developed at the top of a late Pleistocene deposit (Unit II). The oxidized sedimentary layer (uppermost part of Unit II) is characterized by semi-consolidated, yellowish sediments showing signs of desiccation and alteration such as high N value, low water content, periglacial cryogenic structure, depletion of smectite, and high geochemical weathering index (Ba/Sr ratio). This feature, together with radiocarbon ages, suggests that the layer has formed as a result of prolonged subaerial exposure of Unit II sediments during the late Wisconsin sea-level lowstand, producing a regional unconformity. Such unconformitic-bounding surface corresponds to a prominent near-surface reflector (R), which is observed in seismic profiles obtained across the drilled-core sections in the study area. Consequently, the buried oxidized-sedimentary layer associated with the seismic reflector possibly plays a key horizon for the understanding of late Quaternary environmental changes as well as evidence of the emergence of the Yellow Sea shelf during the late Wisconsin sea-level lowstand.
Kim, Dong Il;Kim, Kye Hyun;Lee, Sung Joo;Park, Yong Hyun
Spatial Information Research
/
v.21
no.3
/
pp.21-30
/
2013
Recently, interest of submarine mineral resources has been increasing from the depletion of land resources around the world and many countries are involving in submarine mineral resource exploration work. South Korea is also in progress of mineral exploration and relevant study to ensure the submarine mineral resources from around the Korean Peninsula. As a result, the submarine mineral resource exploration data have been increasing annually. A database and 2D GIS-based system have been constructed for the management of the data. However, submarine mineral resource exploration data is explored and created on the sea-bed. Consequently, the visual confirmation of the water levels and marine landform is important for high dimension analysis. Therefore, the major aims of this study are to collect marine landform data from around the Korean Peninsula and to develop 3 dimension GIS based system that is linked to the submarine mineral resource exploration data. In detail, marine landform data were acquired for the Korean Peninsula and they were interpolated into raster file format. The raster file was then processed to be easily used and was entered into an Oracle database. Based on this database, 3D expression and overlap function between marine landform data and submarine mineral resource exploration data were designed using ArcScene offered by the ESRI. After design, 3D GIS based expression system was developed. Confirmations of locations and changes in the submarine mineral resource exploration data based on 3D GIS are enabled to support the efficient application of the proposed system. It is expected that this system will be highly useful for estimating the reserves of mineral resources and for providing valuable information for economic evaluations.
Acetaminophen (APAP) overdose is known to cause severe hepatotoxicity mainly through the depletion of glutathione. In this study, we compared the cytotoxic effects of APAP on both a normal murine hepatic cell line, BNL CL.2, and its SV40-transformed cell line, BNL SV A.8. Gene expression profiles for APAP-treated cells were also obtained using microarray and analyzed to identify differences in genes or profiles that may explain the differences of susceptibility to APAP in these cell lines. These two cell lines exhibited different susceptibilities to APAP (0-$5,000{\mu}M$); BNL SV A.8 cells were more susceptible to APAP treatment compared to BNL CL.2 cells. A dose of $625{\mu}M$ APAP, which produced significant differences in cytotoxicity in these cell lines, was tested. Microarray analysis was performed to identify significant differentially expressed genes (DEGs) irrespective of APAP treatment. Genes up-regulated in BNL SV A.8 cells were associated with immune response, defense response, and apoptosis, while down-regulated genes were associated with catalytic activity, cell adhesion and the cytochrome P450 family. Consistent with the cytotoxicity data, no significant DEGs were found in BNL CL.2 cells after treatment with $625{\mu}M$ APAP, while cell cycle arrest and apoptosis-related genes were up-regulated in BNL SV A.8 cells. Based on the significant fold-changes in their expression, a genes were selected and their expressions were confirmed by quantitative real-time RT-PCR; there was a high correlation between them. These results suggest that gene expression profiles may provide a useful method for evaluating drug sensitivity of cell lines and eliciting the underlying molecular mechanism. We further compared the genes identified from our current in vitro studies to the genes previously identified in our lab as regulated by APAP in both C57BL/6 and ICR mice in vivo. We found that a few genes are regulated in a similar pattern both in vivo and in vitro. These genes might be useful to develop as in vitro biomarkers for predicting in vivo hepatotoxicity. Based on our results, we suggest that gene expression profiles may provide useful information for elucidating the underlying molecular mechanisms of drug susceptibility and for evaluating drug sensitivity in vitro for extrapolation to in vivo.
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