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Ameliorative effect of alkaloid extract of Cyclea peltata(Poir.) Hook.f.& Thoms.roots(ACP) on APAP/CC1_4 induced liver toxicity in Wistar rats and in vitro free radical scavenging property

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Asian Pacific Journal of Tropical Biomedicine 2014年第2期4卷 143-151页

作者： Varghese Jancy Shine Panikamparambil Gopalakrishnan Latha Somasckharan Nair Rajam Suja Gangadharan Indira Anuja Gopan Raj Sreedharan Nair Rajasekharan Division of Ethnomedicine and Ethnopharmacology Jawaharlal Nehru Tropical Botanic Garden and Research Institute(JNTBGRI)TrivandrumKerala 695562India Deparment of Chemistry Sree Narayana CollegePunalurKollam- 691305KeralaIndia

Objective:To evaluate the hepatoprotective and antioxidant properties of alkaloid extract of Cyclea peltata(C.peltata) against paracetamol/carbon tetra chloride induced liver damage in Wistar rats.Methods:In viro paracetamol/carbon tetrachloride induced liver damage in Wistar rats,in vitro free radical scavenging studies,HPTLC estimation of letrandrine and direct analysis in real timemass spectrometry of alkaloid extract of C.peltata were used for the validation.Results:The results showed that pretreatment with alkaloid extract of C.peltata caused significant reduction of serum glutamate pyruvate transaminase,serum glutamate oxaloacetate transaminase,serum alkaline phosphatase,serum cholesterol,liver malondialdehyde levels.The reduced glutathione,catalase,superoxide dismutase levels in liver were increased with alkaloid extract of C.peltata treatment.These results were almost comparable to silymarin and normal control.Histopathological studies also substantiated the biochemical findings.The in vitro hydroxyl,superoxide and DPPH scavenging study of alkaloid extract of C. peltata showed significant free radical scavenging property.Conclusions:The hepatoprotective property of alkaloid extract of C.peltata against paracetamol/carbon tetrachloride may be due the synergistic action of alkaloids especially tetrandrine,fangchinoline through free radical scavenging and thus preventing oxidative stress.

关键词： Tetrandrine Glutathione Catalase Superoxide dismutase hydroxyl Malondialdehyde

Decontamination of Cr(VI) facilitated formation of persistent free radicals on rice husk derived biochar

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Frontiers of Environmental Science & Engineering 2019年第2期13卷 85-93页

作者： Kaikai Zhang Peng Sun Yanrong Zhang School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

This study investigated the facilitation of Cr(VI)decontamination to the formation of persistent free radicals(PFRs)on rice husk derived biochar.It was found that Cr(VI)remediation by biochar facilitated the production of PFRs,which increased with the concentration of treated Cr(VI).However,excessive Cr(VI)would induce their decay.Biochar with high pyrolysis temperature possessed great performance to Cr(VI)removal,which was mainly originated from its reduction by biochar from Inductively Coupled Plasma Optical Emission Spectroscopy and X-ray Photoelectron Spectroscopy.And the corresponding generation of PFRs on biochar was primarily ascribed to the oxidization of phenolic hydroxyl groups by Cr(VI)from Fourier Transform Infrared Spectroscopy analysis,which was further verified by the H2O2 treatment experiments.The findings of this study will help to illustrate the transformation of reactive functional groups on biochar and provide a new insight into the role of biochar in environmental remediation.

关键词： Biochar Persistent free radicals Phenolic hydroxyl groups Cr(VI) reduction

The Inhibition Effect of Tert-Butyl Alcohol on the TiO_2 Nano Assays Photoelectrocatalytic Degradation of Different Organics and Its Mechanism

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Nano-Micro Letters 2016年第3期8卷 221-231页

作者： Xuejin Li Jinhua Li Jing Bai Yifan Dong Linsen Li Baoxue Zhou School of Environmental Science and Engineering Shanghai Jiao Tong University Key Laboratory for Thin Film and Microfabrication of the Ministry of Education

The inhibition effect of tert-butyl alcohol(TBA), identified as the·OH radical inhibitor, on the TiO_2 nano assays(TNA) photoelectrocatalytic oxidation of different organics such as glucose and phthalate was reported. The adsorption performance of these organics on the TNA photoelectrode was investigated by using the instantaneous photocurrent value, and the degradation property was examined by using the exhausted reaction. The results showed that glucose exhibited the poor adsorption and easy degradation performance, phthalate showed the strong adsorption and harddegradation, but TBA showed the weak adsorption and was the most difficult to be degraded. The degradation of both glucose and phthalate could be inhibited evidently by TBA. But the effect on glucose was more obvious. The different inhibition effects of TBA on different organics could be attributed to the differences in the adsorption and the degradation property. For instance, phthalate of the strong adsorption property could avoid from the capture of·OH radicals by TBA in TNA photoelectrocatalytic process.

关键词： Tert-butyl alcohol Photoelectrocatalysis TiO2 nano assays hydroxyl radical inhibitor Inhibition effect

DFT Study on Reaction Mechanism of Nitric Oxide to Ammonia and Water on hydroxylated Rutile TiO2（110） Surfaces

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DFT Study on Reaction Mechanism of Nitric Oxide to Ammonia a...

Evaluation on Fabrication and Properties of Composite Polyurethane Coatings with Wollastonite Partially Substituting for Rutile Titanium Dioxide

第十三届全国量子化学会议

作者： Xiao-Ying Xie Wei-Hai Fang Ganglong Cui Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal University

NO气体是大气中的一种重要污染物,如何将其转化为对环境无毒无害的物质近年来引起人们的广泛关注。我们采用密度泛函理论,研究NO在TiO2表面的催化反应。通过我们的研究发现,NO在TiO2表面存在两种稳定的吸附方式。同时,我们的研究也发现... 详细信息

NO气体是大气中的一种重要污染物,如何将其转化为对环境无毒无害的物质近年来引起人们的广泛关注。我们采用密度泛函理论,研究NO在TiO2表面的催化反应。通过我们的研究发现,NO在TiO2表面存在两种稳定的吸附方式。同时,我们的研究也发现存在三条能量上可行的路径可以把NO催化转化为对环境无毒无害的NH3分子和H2O分子。值得注意的是TiO2表面OH的覆盖率对反应有很大的影响。

关键词： Rutile NO hydroxyl

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Transactions of Tianjin University 2019年第3期25卷 293-300页

作者： Xiaojing Wang Wei Zhang Yangyang Yan Jing Wang Xiyao Wang School of Chemical Engineering and Technology Tianjin University School of Environmental Science and Engineering Tianjin University

This study aims to prepare a composite polyurethane coating through a facile synthesis process. Titanium dioxide, which is a component of the prepared hydroxyl acrylic resin polyurethane varnish, was partially substituted by wollastonite, and an optimal substitution ratio was obtained. Analyses based on scanning electron microscope, powder X-ray diffraction, and Raman scattering measurements demonstrated that the addition of wollastonite caused nearly no change in the basic structure of the coating. Coating with a substitution ratio of 25% showed high thermal stability, good cover effect, considerable moisture-proof and water resistance ability, great acidic and basic resistance, and improved performance and hardness in performance tests. Furthermore, the production cost was reduced significantly at this substitution ratio.

关键词： Polyurethane coating Wollastonite Rutile titanium dioxide hydroxyl acrylic acid Thermal stability

Polar Mineral Tourmaline and Its Effect on the Photocatalysis of Nano-TiO2

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稀有金属材料与工程 2004年第z1期33卷 305-308页

作者： Ji Zhijiang Zhang Liansong Wang Xiaoyan Wang Jing Wang Jimei Institute of Environmental Engineering China Building Material Academy Beijing 100024China Institute of Environmental Engineering China Building Material Academy Beijing 100024China Institute of Environmental Engineering China Building Material Academy Beijing 100024China Institute of Environmental Engineering China Building Material Academy Beijing 100024China Institute of Environmental Engineering China Building Material Academy Beijing 100024China

The mechanism for tourmaline powder improving the photocatalysis effect of nano-TiO2 was studied by electron-spin resonance (ESR). It is found that the intensity of the signal of hydroxyl free radical produced by the mixture of the tourmaline and nano-TiO2 through 355nm wavelength ultraviolet radiating is increased. Under natural light, the mixture of nano TiO2 and tourmaline powder in a certain weight ratio can improve the effect of decomposing methyl orange that proved that the ESR result was right. The tourmaline particle could promote the photocatalysis of nano-TiO2. This result may be due to the surface electric field of the tourmaline, which can absorb the particle of nano-TiO2 and make the electron inspired by photon transfer from the inner of nano-TiO2 particle to its surface, and even make the electron transfer into tourmaline particle.

关键词： tourmaline powder nano-TiO2 hydroxyl free radical

Gastro retentive microencapsulated Cefpodoxime Proxetil to improve oral bioavailability

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Asian Pacific Journal of Tropical Medicine 2009年第6期2卷 8-10页

作者： Deepa Karthikeyan Karthikeyan M Department of Pharmaceutics Nehru College of PharmacyPambadyThiruvilwamalaThrissur Dist.Kerala State 680597 India Department of Pharmacology Al Shifa College of PharmacyPoothavanam(P.O.)KizhatturPerintalmannaMalappuram Dist.Kerala State 679325 India

Objective:The objective of the present study was to develop floating microspheres of Cefpodoxime Proxetil in order to achieve an extended retention in the upper GIT,which may result in enhanced absorption and there by improved bioavailability.Methods:The microspheres were prepared by non - aqueous solvent evaporation method using polymers such as hydroxyl Propyl Methyl Cellulose（HPMC K15M）,Ethyl Cellulose（EC） in different ratios,and Cefpodoxime Proxetil contain in each formulation.In vitro drug release were performed by USP apparatus type I andthe microspheres were characterized by calculating percentage yield,particle size analysis, buoyancy percentage,drug entrapment efficiencyand in vitro drug release studies.Results:The result showed microspheres yield were 50.50%-72.21%,particle size were distributed between75-600μm,drug entrapment efficiency were 14.1%-28.2%,buoyancy percentage were 70.10%-88.25%.Conclusion: Cefpodoxime Proxetil floating microspheres,at the lower polymer to drug ratio,there was a significant drug release. The better drug release profile was seen with FA2 with ratio of drug polymer（1:2）.

关键词： hydroxyl Propyl Methyl Cellulose Ethyl Cellulose Drug release Bioavailability Non-aqueous solvent evaporation Floating microspheres

Effects of extract F of red-rooted Salvia on mucosal lesions of gastric corpus and antrum induced by hemorrhagic shock-reperfusion in rats

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World Journal of Gastroenterology 2001年第5期7卷 672-677页

作者： Li-Hong Zhang~1 Chang-Bai Yao~2 He-Quan Li~3 1 Department of Anesthesiology,Second Clinical College,China Medical University,Shenyang 110003,Liaoning Province,China2 Department of General Surgery,Second Clinical College,China Medical University3 Department of Pathophysiology,China medical University Department of Anesthesiology Second Clinical College China Medical University Liaoning Province China. cumzhanglihong@***

AIM To compare the effects of extract F of red-rooted Salvia (EFRRS) on mucosal lesions of gastric corpus and antrum induced by hemorrhagic shock and reperfusion in rats.``METHODS The rats were subject to hemorrhagic shock and followed by reperfusion, and were divided randomly into two groups. Group 1 received saline, and group 2received EFRRS intravenously. The index of gastric mucosal lesions (IGML) was expressed as the percentage of lesional area in the corpus or antrum. The degree of gastric mucosal lesions (DGML) was catalogued grade 0,1. 2 and 3. The concentrations of prostaglandins (lags)were measured by radioimmunoassay. The concentration of MDA was measured according to the procedures of Asakawa. The activity of SOD was measured by the biochemical way. The growth rates or inhibitory rates of above-mentioned parametes were calculated.``RESULTS As compared with IGML (%), grade 3 damage (%) and MDA content (nmol/g tissue) of gastric antrum which were respectively 7.96 ± 0.59, 34.86± 4.96 and 156.98± 16.12. those of gastric corpus which were respectively 23.18 ± 6.82, 58.44 ± 9.07 and 230.56 ± 19.37increased markedly (P<0.01), whereas the grade 0damage, grade 1 damage, the concentrations of PGE2 and PGI2(pg/ mg tissue), the ratio of PGI2/ TXA2 and the activity of SOD (U/ g tissue) of corpus which were respectively 3.01 _- 1.01, 8.35 + 1.95, 540.48 _+ 182.78,714.38 ± 123.74, 17.38 ± 5.93 and 134.29 ± 13.35 were markedly lower than those of antrum which were respectively 13.92 ± 2.25, 26.78 ± 6.06, 2218.56 ± 433.12,2531.76 ± 492.35, 43.46 ± 8.51 and 187.45 ± 17.67( P<0.01 ) after hemorrhagic shock and reperfusion. After intravenous EFRRS, the growth rates (%) of grade 0damage, grade 1 damage, the concentrations of PGE2 and PGI2, the ratio of PGI2/TXA2 and the activity of SOD of corpus which were respectively 632.56, 308.62, 40.75,74.75, 92.29 and 122.25 were higher than those in antrum which were respectively 104,89, 58.40, 11.12, 56.58,30.65 and 82.64, whereas the inhibitory rates (%) ofIGML, grade 3 damage a

关键词： plant extracts/pharmacology gastric mucosa/pathology shock hemorrhagic reperfusion hydroxyl radical

Antioxidant activities of different extracts from Amomum longiligulare Fruits

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Journal of Hainan Medical University 2017年第6期23卷 1-4页

作者： Lin Dong Yong Wang Na Wei Xiao-Po Zhang Yin-Feng Tan Jun-QingZhang You-Bin Li Yong-Hui Li School of Pharmaceutical Sciences Hainan Medical UniversityHainan Haikou571199China Hainan Povincial Key Laboratory of R'D on Tropical Medicinal Herbs Hainan Haikou571199China Haikou Municipal Key Laboratory of Li Nationality Medicines Hainan Haikou571199China

Objective:To study the antioxidant activities of five extracts ofAmomi longiligulare (A. longiligulare) to determine the antioxidant fraction.Methods: The ethanol extract ofA. longiligulare was extracted by systematic solvent extraction to obtain the petroleum ether, dichloromethane, ethyl acetate, n-butanol fractions successively. Thein vitro antioxidant activities of the five extracts were evaluated by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical and hydroxyl radical (OH-) scavenging assay methods.Results: The five extracts showed different extent of antioxidant activities in vitro, especially the ethyl acetate and dichloromethane fractions.Conclusion: The difference of antioxidant activity of different extracts may be associated with the type and structure of antioxidant components in each fraction of A. longiligulare fruits.

关键词： Amomum longiligulare fruits Extract fraction Antioxidant activity DPPH hydroxyl radical scavenging