• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 1999년도 The 6th International Symposium on the Development of Anti-Cancer Resource from Plants
• /
• pp.110-117
• /
• 1999

A new lignan named as hibiscuside, (+) pinoresinol 4-O-[-glucopyranosyl (12) -rhamnoside] (1), and a known lignan, syringaresinol (2) were isolated from the root bark of Hibiscus syriacus together with two feruloyltyramines (3,4) and three known isoflavonoids (5,6,7). The structures of these compounds have been established on the basis of their NMR, Mass, UV spectra. Among these phenolic compounds,6-O-acetyl daidzin (5), 6-O- acetyl genistin (6), and 3-hydroxy daidzein (7) with IC50 values of 8.2, 10.6, and 4.1 M, respectively, significantly inhibited lipid peroxidation in rat liver microsomes Hibiscuside (1), E and Z-N-feruloyl tyramines (3,4) exhibited moderate antioxidant activity.

• 한국생물물리학회:학술대회논문집
• /
• 한국생물물리학회 2002년도 제9회 학술 발표회 프로그램과 논문초록
• /
• pp.53-53
• /
• 2002

Inhibitory effects of Cu$\^$2＋/ on the cytochrome P450 (P450)-catalyzed reactions of liver microsomes and reconstituted systems containing purified P450 and NADPH-P450 reductase (NPR) were seen. However, Zn$\^$2＋/, Mg$\^$2＋/, Mn$\^$2＋/, Ca$\^$2＋/, and Co$\^$2＋/ had no apparent effects on the activities of microsomal P450s. Cu$\^$2＋/ inhibited the reactions catalyzed by purified P450s lA2 and 3A4 with IC$\sub$50/ values of 5.7 and 8.4 ${\mu}$M, respectively.(omitted)

• Archives of Pharmacal Research
• /
• 제28권2호
• /
• pp.164-168
• /
• 2005

The EtOAc extract of Youngia koidzumiana significantly inhibited the diacylglycerol acyltransferase (DGAT) from rat liver microsomes. Bioactivity-guided fractionation led to the isolation of nine compounds, the structures of which were established using physicochemical and spectral data. Of the isolated compounds, oleanolic acid (2), methyl ursolate (7) and corosolic aicd (8) inhibited DGAT, with $IC_{50}$ values of 31.7, 26.4, and $44.3{\mu}M$, respectively. However, sesquit-erpenoids showed only weak inhibitory effects toward DGAT.

• 약학회지
• /
• 제43권6호
• /
• pp.736-742
• /
• 1999

Antioxidative and cytoprotective effects of tectorigenin and glycitein isolated from the pueraria thunbergiana and its derivative, genistein, were determined. Among these three compounds, tectorigenin and glycitein bearing 6-methoxyl groups in both isoflavones showed significant free radical scavenging activities on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and xanthine/xanthine oxidase (XOD) generating superoxide anion radical. Tectorigenin only showed a slight inhibitory effect on XOD. We further studied the inhibitory effects of these isoflavones on the lipid peroxidation in rat liver microsomes induced by enzymatic and non-enzymatic methods. Each of them exhibited inhibitory effect on both ascorbic $acid/Fe^{2+}-{\;}and{\;}ADP/NADPH/Fe^{+3}-induced$ lipid peroxidation. Moreover, tectorigenin exhibited the highest protection of hydrogen peroxide damage on HepG2 and Vero cells among the three isoflavones, in the cytoprotective assay. It was suggested that the pattern of antioxidative and cytoprotective effect of isoflavones could be crucially by the aromatic substitution of oxygen-containing groups.

• Preventive Nutrition and Food Science
• /
• 제4권4호
• /
• pp.221-225
• /
• 1999

Antioxidative compounds contained in roasted safflower seeds were investigated. Six phenolic compounds, N-feruloylserotonin, N-(p-coumaroyl) serotonin, matairesinol, 8'-hydroxyarctigenin, acacetin 7-Ο-β-D-glucoside(tilianine) and acacetin were isolated and identified from the extract of seeds. The inhibitory effects of six phenolic compounds on 1,1-dipheny1-2-picrylhydrazyl(DPPH) radical and lipid peroxidation induced by H₂O₂/FeSO₄in rat liver microsomes were determined. Two serotonins showed more potent DPPH radical scavenging activity, and a stronger inhibitory effect on the lipid peroxidation than that of α-tocopherol. In addition, acacetin and matairesinol also considerably inhibited lipid peroxidation, while 2-hydroxy-arctigenin and tilianine were inactive. These results suggest that phenolic compounds, including serotonins, lignans and flavonoids in the roasted safflower seeds can be used as potential dietary natural antioxidants.

• Toxicological Research
• /
• 제9권1호
• /
• pp.35-44
• /
• 1993

Role of rat cytochrome P-450 2E1(P-450 2E 1) in the metabolism of chlorzoxazone was examined by using several approaches' (1) selective inhibiton of catalytic activity in rat liver microsomes by diethyldithiocarbamate, (2) correlation of dimethylnitrosomine N-demethylation with chlorzoxazone 6-hydroxylation, and (3) immunoinhibition of catalytic activity with rabbit anti-rat P-450. The results indicated that P-450 2E1 is responsible for the metabolism of chlorzoxazone.

• Bulletin of the Korean Chemical Society
• /
• 제20권7호
• /
• pp.819-823
• /
• 1999

Antioxidant activities of various mushroom fruiting bodies were investigated in vitro. Among the mushroom extracts examined, Armillariella mellea, Daedalea dickinsi, Fomitella fraxinea and Pleurotus cornusopiae markedly exhibited inhibition on lipid peroxidaton of rat liver microsomes. Ergosterol peroxide (5,8-epidioxy-5α,8α-ergosta-6,22E-dien-3β-ol), antioxidant from A. mellea, was isolated by solvent extraction, silica gel column chromatography and recrystallization. The structure of the compound was determined by NMR, GC/MS and X-ray crystallography. Ergosterol peroxide showed potent inhibition on lipid peroxidation and exhibited higher antioxidant activity than well-known antioxidants, α-tocopherol and thiourea.

• Mass Spectrometry Letters
• /
• 제14권1호
• /
• pp.1-8
• /
• 2023

Eutylone, dibutylone, and dimethylone are potential psychotropic designer drugs. The purpose of this study was to investigate the in vitro metabolic pathways of synthetic cathinones with methylenedioxy groups. The three methylenedioxy derivatives were incubated with human liver microsomes. The metabolites were characterized based on liquid chromatography and quadrupole-time-of-flight mass spectrometry. Eutylone, dibutylone, and dimethylone were metabolized to yield three, six, and four metabolites, respectively. Reduction and demethylenation were the major metabolic pathways for all three drugs tested. However, dibutylone and dimethylone showed an additional metabolite generated via N-oxidation. These results provide evidence for the in vivo metabolism of methylenedioxy synthetic cathinones, and could be applied to the analysis of synthetic cathinones and their relevant metabolites in biological samples.

• 생명과학회지
• /
• 제28권6호
• /
• pp.697-707
• /
• 2018

본 연구는 누에 분말을 단백질 분해력이 뛰어난 Bacillus subtilis KACC 91157 균주로 발효하여 얻은 발효누에 추출물(BSP)을 식이 중에 각각 1%, 2.5%, 5% 수준으로 첨가하여 알코올 투여와 함께 4주 동안 흰쥐에 급여한 후 알코올성 지방간 개선에 미치는 영향을 검토하고자 하였다. 알코올 급여로 인해 증가된 혈중 AST, ALT, ALP 및 LDH 활성은 BSP5군에서 유의적으로 감소하는 경향을 나타내었다. 또한 발효누에 추출물은 간 조직 및 혈중 중성 지질 농도를 정상 수준으로 회복시켜주고, 간 조직 내 ADH, ALDH 활성 증가에 영향을 미치는 것을 확인할 수 있었다. 조직 내 과산화지질 함량을 측정해본 결과 BSP5군에서 유의적으로 감소시켜주는 것을 확인할 수 있었다. 간 조직의 병리학적 관찰 결과 알코올 투여 대조군은 간세포 내 지방구의 수와 크기가 증가하였으나 BSP 투여군에서 유의적으로 지방구가 감소하는 경향을 보였다. 이러한 결과로 보아 고초균 발효누에 추출물은 알코올성 지방간에 대한 개선효과를 가지는 건강기능식품 소재로서 활용할 가능성이 높은 것으로 사료된다.

• 한국식품영양과학회지
• /
• 제33권2호
• /
• pp.255-261
• /
• 2004

뽕나무가루 첨가 배지에서 배양한 느타리버섯균사체 배양물의 조추출물이 자유라다칼로 유도한 linloeic acid의 산화를 대조구에 비해 75.9% 감소시켰고, mouse liver microsome산화에서도 NADPH/Fe$^{++}$ system에서 64.3% 감소시켰다. 이와 같은 효과는 조추출물로부터 용매분획한 분획물의 단독 효과보다 우수하였다. 상황 및 동충하초버섯균사체 배양물의 조추출물도 느타리 버섯균사체 배양물의 조추출물과 효과가 유사하였지만 다소 낮았다.