نتایج جستجو برای: شاخص esi

تعداد نتایج: 84052  

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2008
Hiroki Hotta Qiang Wang Mioko Fukuda Shoichi Aizawa Tomonari Umemura Kazutoshi Sekizawa Kin-ichi Tsunoda

The use of electrospray ionization mass spectrometry (ESI-MS) in negative ion mode was investigated as a direct probe for identifying Al species in Al-accumulating hydrangea (Hydrangea macrophylla) samples. Cell sap solutions of hydrangea leaves were purified using Sephadex G-10 liquid chromatography and each fraction was analyzed using ESI-MS and ESI-MS/MS to identify Al species. In hydrangea ...

Journal: :Electrophoresis 2005
Wang-Chou Sung Honest Makamba Shu-Hui Chen

We present the current status of the development of microfluidic devices fabricated on different substrates for coupling with electrospray ionization-mass spectrometry (ESI-MS). Until now, much success has been gained in fabricating the ESI chips, which show better performances due to miniaturization when compared with traditional methods. Integration of multiple steps for sample preparation an...

Journal: :Analytical chemistry 2003
Nur Sibel Gunay Keiko Tadano-Aritomi Toshihiko Toida Ineo Ishizuka Robert J Linhardt

A systematic approach was used to evaluate the electrospray ionization mass spectral (ESI-MS) analysis of sucrose octasulfate (SOS), an important pharmaceutical agent. SOS represents a model for other suffated carbohydrates, such as heparin and glycosaminoglycan-derived oligosaccharides that also are highly sulfated and pose difficult analytical problems. A survey of ammonium counterions showed...

Journal: :iranian journal of pharmaceutical research 0
heng luo centre of instrumental analysis, sichuan academy of chinese medicine sciences zhifang huang institute of traditional chinese medicine, sichuan academy of chinese medicine sciences xiaolong tang college of pharmaceuitcal science,chengdu university of traditional chinese medicine jinhai yi institute of traditional chinese medicine, sichuan academy of chinese medicine sciences shuiying chen funan jinsha community health service center of qingyang district andong yang centre of instrumental analysis, sichuan academy of chinese medicine sciences

the chemical components in the decoctions of chinese herbal medicines are not always the same as those in the crude herbs because of the insolubility or instability of some compounds. in this work, a high-performance liquid chromatography (hplc) coupled with electrospray ionization (esi) tandem mass spectrometry method was developed to explore dynamic variation patterns of aconitum alkaloids in...

Journal: :Journal of mass spectrometry : JMS 2005
Arno Wortmann Francesco Rossi Gerald Lelais Renato Zenobi

We present an improvement of the titration method for binding constant determination with electrospray ionization (ESI) mass spectrometry that is unaffected by differences in ESI response of measured species in solution. The method consists of a calibration and titration, both using an internal standard that allows relative quantitation. This avoids artifacts such as a decrease in overall signa...

2012
H. Spencer Banzhaf

This paper discusses the construction of an ecosystem services index (ESI) and the respective roles of ecology and economics in that effort. It extends the concept of an ESI, analogous to Gross Domestic Product, to other analogous indices, including an ecosystem price or value index, and a net ESI that accounts for interactions between ecosystem stocks and service flows. A central aim of this p...

2005
Takashi Nozawa Yoshio Yasumura Shiho Futaki Nobuaki Tanaka Hiroyuki Suga

In 10 excised, cross-circulated, isovolumically beating dog left ventricles, we examined the effects of bigeminy, including, paired-pulse stimulation, on cardiac oxygen consumption (Vo2) and evaluated whether the Vo2 versus pressure-volume area (PVA) relation obtained from regularly beating hearts in our previous studies could account for the changes in Vo2 during bigeminies with various coupli...

Journal: :Rapid communications in mass spectrometry : RCM 2006
Zhe-Ming Gu Jiyuan Ma Xian-Guo Zhao Jinn Wu Donglu Zhang

Some compounds readily form [M+46]+ adduct ions during positive ion electrospray ionization mass spectrometry ((+)ESI-MS) analysis. These [M+46]+ ions were characterized as [M+CH3CH2NH2+H]+ by accurate mass determination. Ethylamine involved in the adduct was proposed to be the reduction product of acetonitrile and this was confirmed using deuterated acetonitrile. Other nitrile-containing compo...

2017
Roshanak Aslebagh Kelly L. Wormwood Devika Channaveerappa Emmalyn J. Dupree Izabela Sokolowska Armand G. Ngounou Wetie Sapan Patel Marius Mihasan Alisa G. Woods Costel C. Darie

Abbreviations: PTMs=post-translational modifi cations; PPIs=protein-protein interactions; SDS-PAGE= sodium dodecyl sulfate-polyacrylamide gel electrophoresis; 2D-PAGE=two-dimensional polyacrylamide gel electrophoresis; MS=mass spectrometry; ESI=electrospray ionization; MALDI=Matrix Assisted Laser Desorption Ionization; ESI-MS=electrospray ionization mass spectrometry; MALDI-MS=MALDI mass spectr...

2013
Jennifer S Mathieson Mali H Rosnes Victor Sans Philip J Kitson Leroy Cronin

Herein, we present an approach for the rapid, straightforward and economical preparation of a tailored reactor device using three-dimensional (3D) printing, which can be directly linked to a high-resolution electrospray ionisation mass spectrometer (ESI-MS) for real-time, in-line observations. To highlight the potential of the setup, supramolecular coordination chemistry was carried out in the ...

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