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37 Newest Publications about the topic reference substances

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Synthesis and thermal behavior of polymeric precursor for carbon‐free silicon oxynitride ceramic

09-Aug-2011 | Zhang, Zongbo; Wang, Rui; Wang, Xiujun; Chen, Li; Zhang, Dahai; Luo, Yongming; Xu, Caihong, Journal of Applied Polymer Science, 2011

Abstract A new polymeric precursor, perhydropolysiloxazane (PSNO), for silicon oxynitride (SiON) ceramic was synthesized by a simple one‐pot procedure involving partial hydrolysis of H2SiCl2 and the following ammonolysis reaction of the hydrolyzed intermediates with NH3. The structure of new ...

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Multiphoton Ionization and Circular Dichroism: New Experimental Approach and Application to Natural Products

11-Jul-2011 | Logé, Christoph; Boesl, Ulrich, ChemPhysChem, 2011

Abstract Enantio‐sensitive laser mass spectrometry is the combination of multiphoton ionization by circularly polarized laser light with mass spectrometric detection of ions. The method has been developed as a tool for the fast investigation of chiral molecules in sample mixtures without any ...

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Counter‐current chromatographic method for preparative scale isolation of picrosides from traditional Chinese medicine Picrorhiza scrophulariiflora

01-Jul-2011 | Zhe Chen; Jianbing Wu; Wei Shen; Pei Liu; Yi Cao; Yanbin Lu, Journal of Separation Science, 2011

Abstract Apocynin, androsin, together with picroside I, II and III from crude extracts of Picrorhiza scrophulariiflora were isolated by means of high‐speed counter‐current chromatography (CCC) combining elution‐extrusion (EE) and cycling‐elution (CE) approach. The EECCC took full advantages of ...

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Transitiometric Determination of the Phase Diagram of KNO3 between (350 and 650) K and at Pressures up to 100 MPa†

09-Dec-2010 | Marco A. Aquino-Olivos; Jean-Pierre E. Grolier; Stanislaw L. Randzio; Adriana J. Aguirre-Gutiérrez; Fernando G ..., Journal of Chemical & Engineering Data, 2010

A P, T-phase diagram for KNO3 has been experimentally determined over the temperature range from (350 to 650) K and at pressures up to 100 MPa with the use of a scanning transitiometer. These new results are compared with those reported by other authors. The comparison shows that the pressures ...

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Development of the fingerprint for the quality of Radix Linderae through ultra‐pressure liquid chromatography‐photodiode array detection/electrospray ionization mass spectrometry

01-Sep-2010 | Wu, Yong‐jiang; Zheng, Yun‐liang; Luan, Lian‐jun; Liu, Xue‐song; Han, Zheng; Ren, Yi ..., Journal of Separation Science, 2010

An ultra‐pressure LC (UPLC) method has been developed and validated for the quality evaluation of a traditional Chinese medicine (Radix Linderae) by chemical fingerprint analysis with chromatograms collected at two wavelengths (260 and 320 nm). Eleven characteristic peaks in the fingerprints were ...

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Radiocarbon Dating of Individual Lignin Phenols: A New Approach for Establishing Chronology of Late Quaternary Lake Sediments

31-Aug-2010 | Juzhi Hou; Yongsong Huang; Corynn Brodsky; Marcelo R. Alexandre; Ann P. McNichol; John W. King; Feng Sheng Hu; Ji Sh ..., Analytical Chemistry, 2010

The reliability of chronology is a prerequisite for meaningful paleoclimate reconstructions from sedimentary archives. The conventional approach of radiocarbon dating bulk organic carbon in lake sediments is often hampered by the old carbon effect, i.e., the assimilation of ancient dissolved ...

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Development and validation of an ultra high‐performance liquid chromatographic method for the determination of a diastereomeric impurity in (+)‐pinoresinol diglucoside chemical reference substance

01-Jul-2010 | Song, Jing‐Zheng; Cheung, Lok Man; Liu, Xin; Qiao, Chun‐Feng; Zhou, Yan; Li, Song‐Lin; Chen, Sh ..., Journal of Separation Science, 2010

(+)-Pinoresinol 4,4[prime]-di-O-[beta]-D-glucopyranoside ((+)-PDG) is one of the major lignans with various pharmacological activities which could be isolated from Duzhong and other plant species. In this study, a diastereomeric impurity, (-)-pinoresinol 4,4[prime]-di-O-[beta]-D-glucopyranoside ...

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