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Two new phenylpropanoid glycosides from Sanguisorba officinalis

Chinese Chemical Letters 2012年第11期23卷 1243-1246页

作者： Jiang Hu Xiao Dong Shi Xia Mao Wei Dong Lu Lei Zhu Long Yu College of Biological Resources and Environment Science Qujing Normal University Qujing 655011 China

Two new phenylpropanoid glycosides, 9-O-[6-O-acetyl-β-D-glucopyranosyl]-4-hydroxycinnamic acid （1） and 8-O-β-D-glucopyranosyl-（R）-（＋）-3,4,8-trihydroxy methyl phenylpropionate （2） were isolated from the 80% EtOH extract of the roots of Sanguisorba officinalis. Their slructures were characterized by spectroscopic analysis and chemical method, including 1D nmr, 2D nmr, and HR-ESI-MS. Compounds 1 and 2 exhibited the moderate antimicrobial activities against all Gram-positive and Gram-negative bacteria tested.

关键词： Sanguisorba officinalis Rosaceae Phenylpropanoid glycosides nmr techniques

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Two new compounds from Coriaria nepalensis

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Chinese Chemical Letters 2011年第9期22卷 1078-1080页

作者： Jian Hong Yang Jian Xin Pu Xue Du Hai Bo Zhang Wei Lie Xiao Han Dong Sun State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kuming 650204 China

Two new compounds. corialins A （1） and B （2） were isolated from Coriaria nepulensis Wall. These new compounds were established as 7-hydroxy-3-[2,3-acetonidc-（3-methylhutane）] coumarin （1） and 3-O-β-D-glucopyr... 详细信息

关键词： Coriaria nepalensis Corialin A Corialin B nmr techniques

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Separation, Identification, Isolation and Characterization of Degradation Product of Osimertinib Tablets by UPLC-QTOF-MS/MS and nmr: Evaluation of <i>In-Silico</i>Safety Assessment for Osimertinib (OSM) and Degradation Product (DP)

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Advances in Biological Chemistry 2021年第1期11卷 15-29页

作者： Arun D. Bhutnar Seema R. Saple Vikas V. Vaidya Department of Chemistry Kirti M Doongursee College Mumbai University Mumbai India Royal college of Arts Science and commerce Mumbai University Thane India

The present work encompasses identification and characterization of major degradation product (DP) of OSM observed in base hydrolytic stress study. The separation of DP was carried out on a non-polar stationary phase by using high-performance liquid chromatography system (HPLC). Using waters X-bridge (250 mm × 4.6 mm, 5 μm) C18 column with gradient elution program. For the characterization study, stress samples were subjected to HPLC and UPLC-QTOF-MS/MS and based on mass fragmentation pattern, plausible structure was deduced. Further, the DP was isolated using semi-prepara- tive liquid chromatography and concentrated the fractions using lyophilization. The isolated DP was subjected to extensive 1D (1H, 13C, and DEPT-135) and 2D (COSY, HSQC and HMBC) nuclear magnetic resonance (NMR) studies to authenticate the structure. The impurity was unambiguously named as N-(2-((2-(dimethylamino)ethyl)(methyl)amino)-4-metho-xy-5-

关键词： Osimertinib Mesylate (OSM) Base Degradation Semi-Preparative Isolation and Characterizations by HPLC UPLC-QTOF-MS/MS nmr techniques

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nmr study on the effects of sodium n-dodecyl sulfate on coil-to-globule transition of poly（N-isopropylacrylamide） in aqueous solutions

NMR study on the effects of sodium n-dodecyl sulfate on coil...

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2011年全国高分子学术论文报告会

作者： Jianqiang Chen a,Xiaoliang Gong b,Hu Yang a,Yefeng Yao b,Min Xu b,Qun Chen b,Rongshi Cheng a,c (a.Key Laboratory of Mesoscopic Chemistry of MOE,Department of Polymer Science and Technology,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210093,P.R.China) (b.Physics Department and Shanghai Key Laboratory of Magnetic Resonance,East China Normal University,Shanghai 200062,P.R.China) (c.College of Material Science and Engineering,Polymer Institute,South China University of Technology,Guangzhou,Guangdong 510640,P.R.China)

＜正＞The effects of sodium n-dodecyl sulfate （SDS） on the conformational changes of thermosensitive poly（N-isopropylacrylamide）（PNIPAM） in dilute aqueous solutions are investigated by the

关键词： Poly(N-isopropylacrylamide) sodium n-dodecyl sulfate coil-to-globule transition nmr techniques

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Several Applications of nmr in Organic Chemistry Research

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Chemical Research in Chinese Universities 2001年第Z1期17卷 206-页

作者： CUI yuxin XU hao National Lab of Natural and Biomimetic Drugs Medical and Health Analysis Center Peking University

Modem nmr techniques, especially 2D-nmr have presented their powerful application in organic chemistry. Not only in structural determination, mechanism investigation, but also in solution conformation study for natural products. In this paper, various pulse field gradient nmr techniques such as COSY, NOESY, HMBC and HMQC were combined to study these problems.

关键词： nmr techniques solution conformation organic chemistry natural products

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