• Korean Journal of Pharmacognosy
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• v.28 no.4
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• pp.239-246
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• 1997

The methanol extracts of some marine algae were tested for investigating the effects on the formation of lipid peroxide and the activities of free radical generating enzyme in vitro in bromobenzene-treated rat. The extracts of Enteromorpha compressa, Capsosiphon fulvescens, Gelidium amansii, Hizikia fusiformis, Sargassum siliquastrum and Sargassum thunbergii which decreased the formation of lipid peroxide, inhibited the activity of xanthine and aldehyde oxidases by adding of each extracts. Phloroglucinol isolated from Ecklonia stolonifera reduced bromobenzene-induced hepatic lipid peroxidation. This compound administered daily over one week before intoxication with bromobenzene did not affect the activities of aminopyrine N-demethylase, aniline hydroxylase and glu tathione S-transferase. Epoxide hydrolase activity was decreased by bromobenzene, which was restored by pretreatment of phloroglucinol, The results suggest that the bromobenzene-induced hepatic lipid peroxidation by phloroglucinol is reduced by enhancing the activity of epoxide hydrolase.

• Food Science and Preservation
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• v.21 no.1
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• pp.129-139
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• 2014

This study was conducted in order to investigate the optimal fermentation periods of the Smilax china L. leaves as a fermented tea via Aspergillus oryzae for 0 (non-fermented), and 10, 20, and 30 days (NF, F10, F20, F30). It was also observed for its quality characteristics. In the color and spectrum (400~700nm) of 1% tea water extract, NF was light yellow, whereas fermented tea (F10~F30) was light red color, and the F10 among F10~F30 has the clearest color and spectrum. Furthermore, acceptabilities of aroma and brightness were insignificantly different between NF and F10~30, while the mouth feel and overall acceptabilities were insignificantly distinct among all of the fermented teas. Therefore, these results suggest that the appropriate fermentation period for tea fermentation is 10 days. On the other hand, the total polyphenol and flavonoid content in the NF was the highest among all of the fermented teas. In the antioxidant parameters, EDA (electron donating ability), FRAP (ferric reducing antioxidant power), and LPOIA (lipid peroxidation inhibitory activity) in the NF were the highest among all fermented teas. Meanwhile, the XOI (xanthine oxidase inhibitory activity) was low, as well as insignificantly different from NF and F10~F30, whereas the AOI (aldehyde oxidase inhibitory activity) was markedly higher (38.09~41.70%) by the hot water tea extract (with or without fermentation), particularly the AOI that has increased via fermentation. In conclusion, the overall antioxidant activity tended to be reduced by fermentation; however, the EDA, FRAP and LPOIA in the fermented tea for 10 days was higher than the activities during 20~30 days of fermentation. There was a similar result in the color and acceptability of fermented tea for 10 days, which was remarkably better than those of 20-30 days. Therefore, fermented tea from the leaves of Smilax china L. could be expected to be used as a functional tea without the loss of inhibitory activity of both the XO and AO via fermentation.

• Korean Journal of Pharmacognosy
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• v.27 no.2
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• pp.117-122
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• 1996

The methanolic extracts of some marine natural products were tested for investigating the effects on the formation of lipid peroxide and the activities of free radical generating enzymes. The methanolic extracts of Styela clava, Ecklonia stolonifera, Pachymeniopsis elliptica and Hypnea charoides which decreased the formation of lipid peroxide inhibited the activity of xanthine oxidase about 41, 20, 20 and 21% by adding $100\;{\mu}g/ml$ of each methanolic extracts, respectively. However, the four extracts didn't inhibit the activity of aldehyde oxidase.

• Microbiology and Biotechnology Letters
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• v.23 no.1
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• pp.60-67
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• 1995

Methanol assimilating yeast, Hansenula sp. MS-364 that has high productivity with methanol as carbon and energy source has been preserved at dept. of Microbiological engineering. Purification and properties of alcohol oxidase (E.C.1.1.3.13: oxygen oxidoreductase) were investigated in the methanol assimilating yeast, Hansenula sp. MS-364. Alcohol oxidase is related to the catalytic reaction that degrades alcohol to aldehyde and peroxide. The methanol oxidizing enzyme was purified by ammonium sulfate precipitation, DEAE-Sephadex A-50 chromatography and gel filtration on Sepharose 6B from cell-free extract. The purified enzyme preparation gave a single band in the sodium dodesyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The molecular weight of the enzyme was calculated to be about 576,000 and molecular weight of subunit was also calculated to be 72,000. The optimal pH and temperature of the enzyme reaction were pH 7.5 and 37$\circ$C, respectively. The enzyme was unstable in acidic pH and higher temperature. The enzyme was not specific for methanol and also oxidized lower primary alcohols. The Km value for methanol was 2.5 mM and that for ethanol was 1.66 mM. The enzyme was heavily inhibited by metal ions such as Hg$^{2+}$, Ag$^{2+}$, Cu$^{2+}$. The high concentration of EDTA and sulfhydryl reagents strongly inhibited the enzyme activity. The component of coenzyme was determined to flavin adenine dinucleotide.

• Journal of Physiology & Pathology in Korean Medicine
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• v.18 no.1
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• pp.206-213
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• 2004

This study was performed to evaluate the anticonvulsant, antioxidant effect of modified formulas Korean traditional medicine Gungchihwadam-Jeon(GCHDJ). The extract of GCHDJ was administered (p.o.) to mice for 14 days in anticonvulsant and antioxidant tests. The pretreatment of GCHDJ extract prohibited the pentylenetrazol(PTZ)-induced convulsion in PTZ-induced convulsion, lowered level of brain r-aminobutyric acid(GABA) was restored by the pretreatment of GCHDJ. Increased level of brain glutamic acid was lowered to normal state by GCHDJ, and increased activity of brain r-aminobutyric acid transaminase(GABA-T) was reduced by GCHDJ. In PTZ-induced convulsion, increased level of brain lipid peroxide was lowered to normal state by the pretreatment of GCHDJ. Increased activity of brain xanthine oxidase(XOD) was lowered to normal state by GCHDJ, and increased activity of brain aldehyde oxidase lowered to normal state by GCHDJ. In PTZ-induced convulsion, increased activities of superoxide dismutase(SOD) and catalase in brain were lowered by the pretreatment of GCHDJ, whereas increased level of glutathione and increased activity of gluthathione peroxidase in brain were not changed significantly. Above results suggest that GCHDJ have anticonvulsant. antioxidant effect. That seems to be strongly related with the levels of GABA, glutamate, lipid peroxide and the activities of GABA-T, XOD, aldehyde oxidase, SOD, catalase in brain tissue. From these results, GCHDJ could be applied to various convulsive disorders.

• Bulletin of the Korean Chemical Society
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• v.30 no.1
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• pp.57-60
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• 2009

Alcohol oxidase catalyzes the oxidation of short lines alcohol to aldehyde. In this study, alcohol oxidase from Hansenula polymorpha (HpAOD) was induced by addition of 0.5% methanol as the carbon source and purified to electrophoretic homogeneity by column chromatographies. The purified HpAOD was immobilized with DEAE-cellulose particles and its biochemical properties were compared with those of free enzyme. The substrate specificity and the optimum pH of immobilized enzyme were similar to those of free enzyme. On the other hand, the Km values of free and immobilized enzymes for ethanol were 6.66 and 14.65 mM, respectively. The optimum temperature for free enzyme was ${50^{\circ}C}$, whereas that for immobilized enzyme was ${65^{\circ}C}$. Immobilized enzyme showed high stability against long storage. Immobilized enzyme was also tested for the enzymatic determination of ethanol by the colorimetric method. We detected 1 mg/liter ethanol ($1{\times}10^{-4}$% ethanol) by 2,6- dichloroindophenol system. Therefore, the present study demonstrated that immobilized HpAOD has high substrate specificity toward ethanol and storage stability, which may be of considerable interest for alcohol biosensor and industrial application.

• Journal of Sensor Science and Technology
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• v.8 no.3
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• pp.247-252
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• 1999

The oxygen electrode of a biosensor needs enzyme immobilized membrane and a dialysis membrane to measure the oxygen concentration that remains after an enzyme reacts with its substrate. Accodingly, a single-layer PVA laminated CTA/PCL membrane was developed as an oxygen biosensor electrode. The enzymes were immobilized on a cellulose triacetate/polycarprolactone membrane using the 1,1'-carbonyl diimidazole(CDI) method, and then laminated with polyvinyl alcohol, aldehyde and acid. The alcohol oxidase and PVA laminated CTA/PCL membrane was tested with various concentration of enzyme substrates using a Yellow Springs Instrument(YSI) oxygen sensor. Under 5-10mmol substrates produced $0.37{\sim}0.83{\mu}A$(r=0.995) currents, and ater 8 weeks the glucose oxidase activity remained at about 56%, while the other activities remained very low. A SEM indicated a smooth surface and tightly attached PVA on the enzyme-immobilized CTA/PCL membranes.

• Journal of Life Science
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• v.18 no.1
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• pp.129-135
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• 2008

Paraquat (1,1-dimethyl 4,4' -dipyridium dichloride; PQ) is a kind of herbicide. Terminalia chebulae (TC) has been used as a medicine in China and in Korea for treating illnesses such as diarrhea, collapsed anus, spasmodic, diphtheria, asthma etc.. This study was to examin new physiological activities of methanol extract of TC (TCM) on the toxicity of PQ. It was observed biochemical effects on the toxicity of PQ in kidney and lung tissues after treatment orally administered 100, 200, 300 mg/kg of TCM daily for two weeks. In the experiment related to the toxicity of PQ, we got following results: renal and pulmonary lipid peroxide contents, activities of aminopyrine N-demethylase, aldehyde oxidase and xanthine oxidase were significantly increased in control group as compared with normal group, in the treatment of TCM the values were decreased as compared with control group. Activities of superoxide dismutase, catalase and glutathione peroxidase which are free radical scavenging enzymes were also increased in control group as compared with normal goup, but were decreased in TCM group as compared with control group. Collagen content and glucose-6-phosphatase activity in lung tissue were increased in control group as compared with normal, but was decreased in TCM group as compared with control group. From these results, we concluded that TCM can playa role as an effective agent to decrease toxicity of PQ.

• Journal of Life Science
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• v.17 no.7 s.87
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• pp.990-995
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• 2007

We tested the effect of sodium tungstate, which disturbs the molybdenum cofactor formation, on the activities of aldehyde oxidase(AO) and the growth of maize(Zea mays) primary roots. As reported in other plants, sodium tungstate inhibited AO also in the maize root concentration-dependently. The inhibitory effect of sodium tungstate was observed only when the inhibitor was applied to the living plants. Application of tungstate to the extracted protein did not show any effect. Western analysis revealed slightly decreased level of AO protein in the presence of tungstate, indicating a positive feedback of gene regulation by the product. We also tested the effects of tungstate on the root growth. The elongation of primary root and the development of lateral roots, which are sensitive to the absolute level of auxin, were decreased in the presence of sodium tungstate. However, the gravitropic curvature of the primary root, which is dependent on the relative amount of auxin at both sides, was unaffected. These data suggested the decrease of auxin biosynthesis by the application of tungstate. However, the level of free IAA was unaffected by tungstate application. We discuss the possible explanations for the observed results.

• Proceedings of the Korean Society of Applied Pharmacology
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• 2003.11a
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• pp.97-97
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• 2003

This study is investigated the effect of Rubus coreanus MIQ. against nephrotoxicity induced by cisplatin in rat. We examined the potency of the extract of R. coreanus fruits by the activity-guided fractionation. The EtOAc- and BuOH fraction, niga-ichigoside F$_1$and 23-hydroxytormentic acid showed significant protective effects as lipid peroxidation in renal tissue and was was not affect the activity of xanthine oxidase and aldehyde oxidase by cisplatin-induced nephrotoxicity. The concentration of glutathione in renal tissue was decreased by cisplatin-induced nephrotoxicity, but was improved by pretreatment of R. coreanus compounds especially in butanol, ethylacetate fraction and 23-hydroxytormentic acid.