نتایج جستجو برای: packed columns

تعداد نتایج: 39088  

Journal: :Organic letters 2005
Stefan France Daniel Bernstein Anthony Weatherwax Thomas Lectka

[reaction: see text] We describe the diastereoselective synthesis of a pharmaceutically active drug candidate via a column-based system. This methodology is complementary to classical solid-phase synthesis; individual columns are packed with resin-bound reagents and then linked in sequence and/or in parallel. In contrast to the traditional solid-phase approach, substrates are introduced in the ...

2006
John W. Henderson Ronald E. Majors

Pindolol is a beta blocker which helps to lower blood pressure and may possibly also alleviate depression. With potentially even more uses for this drug product it is important to develop faster analyses of it. Using pindolol and a USP method, this study demonstrates how use of short HPLC columns packed with sub-2-micron support particles (ZORBAX SB-CN (L10) columns) provide easy scalability to...

Davood Rekabi Zadeh Mehdi Amouei Mohammad Mahdi Montazer Rahmati,

Brass Ferrules have been used as packing in a laboratory- scale glass distillation column approaching pilot plant size because of their availability in all sizes and low cost. The available size range is such that these ferrules could also be used in industry and the results of this study could be scaled up. The performance of the new packing has been compared with the performance of glass ...

Journal: :Solvent extraction research and development, Japan 2021

Strength of axial mixing in the emulsion phase during progress extraction was evaluated using Peclet number under various flow conditions. The numbers were determined with established tracer technology which applies inert species for iodine extraction. Very little effect operating velocities either aqueous and organic phases found on numbers. This fact indicates that an almost constant degree k...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2007
Tohru Ikegami Jun Ichimaru Wataru Kajiwara Nozomi Nagasawa Ken Hosoya Nobuo Tanaka

A novel method was developed for the preparation of highly efficient anion- and cation-exchange microHPLC columns using an on-column polymerization of methacrylates having amine or sulfonic acid functional groups onto monolithic silica capillary columns modified with 3-methacryloxypropyltriethoxysilane as the anchor groups. The chromatographic evaluation of the columns using nucleic acids, nucl...

Journal: :The Analyst 2014
S Sandron B Heery V Gupta D A Collins E P Nesterenko P N Nesterenko M Talebi S Beirne F Thompson G G Wallace D Brabazon F Regan B Paull

Coiled planar capillary chromatography columns (0.9 mm I.D. × 60 cm L) were 3D printed in stainless steel (316L), and titanium (Ti-6Al-4V) alloys (external dimensions of ~5 × 30 × 58 mm), and either slurry packed with various sized reversed-phase octadecylsilica particles, or filled with an in situ prepared methacrylate based monolith. Coiled printed columns were coupled directly with 30 × 30 m...

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