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Anti-inflammatory Activity of Flavonoids from Populus davidiana
XinFeng Zhang,배기환,Tran Manh Hung,Phuong Thien Phuong,Tran Minh Ngoc,민병선,송경식,성연희 대한약학회 2006 Archives of Pharmacal Research Vol.29 No.12
An in vitro bioassay-guide revealed that the methanol (MeOH) extract of the stem bark of Populus davidiana showed considerable inhibitory activity against cyclooxygenase (COX-1, COX- 2). Continuous phytochemical study of the MeOH extract of this plant led to the isolation of ten flavonoids; sakuranetin (1), rhamnocitrin (2), 7-O-methylaromadendrin (3), naringenin (4), eriodictyol (5), aromadendrin (6), kaempferol (7), neosakuranin (8), sakuranin (9) and sakurenetin- 5,4'-di-β-D-glucopyranoside (10). Their structures were identified on the basis of their physicochemical and spectroscopic analyses. The isolated compounds, 1-10, were tested for their inhibitory activities against COX-1 and COX-2. Compound 7 was found to have potent inhibitory effect on COX-1 and a moderate effect on COX-2, meanwhile, compounds 1-6 showed moderate inhibition against COX-1 only. Moreover, compounds 5–8 exhibited suppressive effects on xanthine oxidase (XO). These results may explain, in part, the traditional uses of P. davidiana in ethnomedicine.
Antioxidant Activity of Anthraquinones and Flavonoids from Flower of Reynoutria sachalinensis
Xinfeng Zhang,Phuong Thien Thuong,WenYi Jin,Nguyen Duy Su,석대은,배기환,강삼식 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.1
Bioassay-guided fractionation of methanol extract of Reynoutria sachalinensis flower using DPPH assay has led to the isolation of three anthraquinones and three flavonoids. Their structures were identified as emodin (1), emodin-8-O-β-D-glucopyranoside (2), physcion-8-O-β-Dglucopyranoside (3), quercetin-3-O-α-L-arabinofuranoside (4), quercetin-3-O-β-D-galactopyranoside (5), and quercetin-3-O-β-D- glucuronopyranoside (6) by comparing their physicochemical and spectral data with those published in literatures. All isolated compounds were evaluated for antioxidant activities with free radical 1, 1-diphenyl-2-picrylhydrazyl (DPPH) scavenging, superoxide radical scavenging and Cu2+-mediated low density lipoprotein (LDL) oxidation assay. The results demonstrated that three flavonoids, 4, 5, and 6 had remarkable antioxidant activities with the IC50 values of 64.3, 54.7, and 46.2 µM (DPPH scavenging), the IC50 values of 6.0, 6.7, and 4.4 µM (superoxide radical scavenging) and the IC50 values of 3.8, 3.2, and 5.4 µM against LDL oxidation, respectively.
Anti-inflammatory Activity of Flavonoids from Populus davidiana
Zhang, XinFeng,Hung, Tran Manh,Phuong, Phuong Thien,Ngoc, Tran Minh,Min, Byung-Sun,Song, Kyung-Sik,Seong, Yeon-Hee,Bae, Ki-Hwan The Pharmaceutical Society of Korea 2006 Archives of Pharmacal Research Vol.29 No.12
An in vitro bioassay-guide revealed that the methanol (MeOH) extract of the stem bark of Populus davidiana showed considerable inhibitory activity against cyclooxygenase (COX-1, COX-2). Continuous phytochemical study of the MeOH extract of this plant led to the isolation of ten flavonoids; sakuranetin (1), rhamnocitrin (2), 7-O-methylaromadendrin (3), naringenin (4), eriodictyol (5), aromadendrin (6), kaempferol (7), neosakuranin (8), sakuranin (9) and sakurenetin-5,4'-di-${\beta}$-D-glucopyranoside (10). Their structures were identified on the basis of their physicochemical and spectroscopic analyses. The isolated compounds, 1-10, were tested for their inhibitory activities against COX-1 and COX-2. Compound 7 was found to have potent inhibitory effect on COX-1 and a moderate effect on COX-2, meanwhile, compounds 1-6 showed moderate inhibition against COX-1 only. Moreover, compounds 5-8 exhibited suppressive effects on xanthine oxidase (XO). These results may explain, in part, the traditional uses of P. davidiana in ethnomedicine.
Antioxidant Activity of Anthraquinones and Flavonoids from Flower of Reynoutria sachalinensis
Zhang Xinfeng,Thuong Phuong Thien,Jin WenYi,Su Nguyen Duy,Sok Dai Eun,Bae KiHwan,Kang Sam Sik The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.1
Bioassay-guided fractionation of methanol extract of Reynoutria sachalinensis flower using DPPH assay has led to the isolation of three anthraquinones and three flavonoids. Their structures were identified as emodin (1), emodin-8-O-$\beta$-D-glucopyranoside (2), physcion-8-O-$\beta$-Dglucopyranoside (3), quercetin-3-O-$\alpha$-L-arabinofuranoside (4), quercetin-3-O-$\beta$-D-galactopyranoside (5), and quercetin-3-O-$\beta$-D-glucuronopyranoside (6) by comparing their physicochemical and spectral data with those published in literatures. All isolated compounds were evaluated for antioxidant activities with free radical 1, 1-diphenyl-2-picrylhydrazyl (DPPH) scavenging, superoxide radical scavenging and $Cu^{2+}$-mediated low density lipoprotein (LDL) oxidation assay. The results demonstrated that three flavonoids, 4, 5, and 6 had remarkable antioxidant activities with the $IC_{50}$ values of 64.3, 54.7, and 46.2${\mu}M$ (DPPH scavenging), the $IC_{50}$ values of 6.0, 6.7, and $4.4{\mu}M$ (superoxide radical scavenging) and the $IC_{50}$ values of 3.8, 3.2, and 5.4${\mu}M$ against LDL oxidation, respectively.
Xinfeng Wu,Bo Tang,Jinhong Yu,Xiao Cao,Chongyin Zhang,Yonggen Lv 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
Graphite reinforced hollow epoxy macrospheres (GR-HEMS) and hollow glass microspheres (HGMS) were used to prepare three phase epoxy syntactic foam (ESF) using “molding method”, and the physical and mechanical properties of ESF were also studied and investigated. An innovative “rolling ball method” was implemented in the GR-HEMS preparationprocess. The performance tests show that higher GR-HEMS stacking volume fraction, lower GR-HEMS thickness, higher GR-HEMS diameter, higher HGMS volume fraction, lower HGMS density are beneficial to reducing the density of ESF, but the effects of the five factors on the strength of ESF are the opposite. Therefore, in order to obtain “high strength and low density” ESF composites, the various factors should be considered to achieve a balance of the strength and the density. Scanning electron microscope (SEM) shows that the “rolling ball method” can make graphite form a graphite spherical x-y network throughout the macrosphere wall, which can make GR-HEMS and ESF have great compressive strength. The ESF (450 kg/m3, 20.75 MPa) can withstand the 2075 meters water pressure and provide 550 kg/m3 buoyancy, which can givesome advice to the preparation of buoyancy material used in deepwater oil exploration.
Miansong Zhang,Mengke Yao,Airong Jia,Yaping Shi,Xinfeng Bai,Xue Liu,Tingting Cui,Xin Liu,Changheng Liu 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.13
The soluble dietary fiber from Asparagus officinalis(ASDF) was successively prepared using enzymolysiscombined with spray-drying technology. Highperformanceliquid chromatography analysis showed thatASDF contained two polysaccharide fractions with theaverage molecular weight of 2.77 9 105 and6.44 9 103 Da, and was composed of mannose, rhamnose,galacturonic acid, glucose, galactose, and arabinose with amolecular ratio of 19.93:1.02:1.94:32.17:1.00:1.91,respectively. ASDF showed potential in vitro antioxidantactivities. The oral administration of ASDF significantlyreduced the levels of total cholesterol, triglyceride, andlow-density lipoprotein cholesterol in HD-induced miceserum. Furthermore, 16S rRNA gene sequencing analysisshowed that ASDF significantly affected the compositionof intestinal microbiota, especially reducing the Firmicutes/Bacteroidotetes ratio and the relative abundances ofDesulfobacterota, Proteobacteria, Actinobacteriota andincreasing that of Muribaculaceae, Bacteroides, and Alloprevotella. These results demonstrated that the intake ofASDF could regulate intestinal microbiota and serum lipidlevels in hyperlipidemic conditions.
Impact factors of an old bridge under moving vehicular loads
Yang Liu,Xinfeng Yin,Jianren Zhang,C.S. Cai 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.3
This paper presents a new method to study the impact factor of an old bridge based on the model updating technique. Using the genetic algorithm (GA) by minimizing an objective function of the residuals between the measured and predicted responses, the bridge and vehicle coupled vibration models were updated. Based on the displacement relationship and the interaction force relationship at the contact patches, the vehicle-bridge coupled system can be established by combining the equations of motion of both the bridge and vehicles. The simulated results show that the present method can simulate precisely the response of the tested bridge; compared with the other bridge codes, the impact factor specified by the bridge code of AASHTO (LRFD) is the most conservative one, and the value of Chinese highway bridge design code (CHBDC) is the lowest; for the large majority of old bridges whose road surface conditions have deteriorated, calculating the impact factor with the bridge codes cannot ensure the reliable results.