Shinwa Chemical Industries Ltd.

Fushimi ku, Japan

Shinwa Chemical Industries Ltd.

Fushimi ku, Japan

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Trefz P.,University of Rostock | Kischkel S.,University of Rostock | Hein D.,PAS Technology Deutschland GmbH | James E.S.,Shinwa Chemical Industries Ltd. | And 2 more authors.
Journal of Chromatography A | Year: 2012

Combining advantages of SPE and SPME needle trap devices (NTD) represent promising new tools for a robust and reproducible sample preparation. This study was intended to investigate the effect of different packing materials on efficacy and reproducibility of VOC analysis by means of needle trap micro extraction (NTME). NTDs with a side hole design and containing different combinations of PDMS, DVB and Carbopack X and Carboxen 1000 and NTDs containing a single layer organic polymer of methacrylic acid and ethylene glycol dimethacrylate were investigated with respect to reproducibility, LODs and LOQs, carry over and storage. NTDs were loaded with VOC standard gas mixtures containing saturated and unsaturated hydrocarbons, oxygenated and aromatic compounds. Volatile substances were thermally desorbed from the NTDs using fast expansive flow technique and separated, identified and quantified by means of GC-MS. Optimal desorption temperatures between 200 and 290°C could be identified for the different types of NTDs with respect to desorption efficiency and variation. Carry over was below 6% for polymer packed needles and up to 67% in PDMS/Carboxen 1000 NTDs. Intra and inter needle variation was best for polymer NTDs and consistently below 9% for this type of NTD. LODs and LOQs were in the range of some ng/L. Sensitivity of the method could be improved by increasing sample volume. NTDs packed with a copolymer of methacrylic acid and ethylene glycol dimethacrylate were universally applicable for sample preparation in VOC analysis. If aromatic compounds were to be determined DVB/Carboxen 1000 and DVB/Carbopack X/Carboxen 1000 devices could be considered as an alternative. PDMS/Carbopack X/Carboxen 1000 NTDs may represent a good alternative for the analysis of hydrocarbons and aldehydes. NTME represents a powerful tool for different application areas, from environmental monitoring to breath analysis. © 2011 Elsevier B.V.


Ueta I.,Yamanashi University | Mizuguchi A.,Yamanashi University | Fujimura K.,Shinwa Chemical Industries Ltd | Kawakubo S.,Yamanashi University | Saito Y.,Toyohashi University of Technology
Analytica Chimica Acta | Year: 2012

A novel needle-type sample preparation device was developed for the effective preconcentration of volatile organic compounds (VOCs) in indoor air before gas chromatography-mass spectrometry (GC-MS) analysis. To develop a device for extracting a wide range of VOCs typically found in indoor air, several types of particulate sorbents were tested as the extraction medium in the needle-type extraction device. To determine the content of these VOCs, air samples were collected for 30. min with the packed sorbent(s) in the extraction needle, and the extracted VOCs were thermally desorbed in a GC injection port by the direct insertion of the needle. A double-bed sorbent consisting of a needle packed with divinylbenzene and activated carbon particles exhibited excellent extraction and desorption performance and adequate extraction capacity for all the investigated VOCs. The results also clearly demonstrated that the proposed sample preparation method is a more rapid, simpler extraction/desorption technique than traditional sample preparation methods. © 2012 Elsevier B.V.


Patent
Shinwa Chemical Industries Ltd. | Date: 2015-01-28

An object of the present invention is to provide a porous silica powder suitable for, for example, a gas chromatography support, and the porous silica powder has an average pore diameter of 0.5 to 10 m as determined by a mercury intrusion method, a volume of pores having a 100 nm or smaller pore diameter of 0.2 cm^(3)/g or less as determined by a nitrogen gas adsorption method, a specific surface area of 0.5 to 100 m^(2)/g as determined by a nitrogen gas adsorption method, and a particle size distribution of 10 to 1000 m.


Patent
Shinwa Chemical Industries Ltd. and Tokyo Electron | Date: 2012-02-08

A micro-channel device provided in a solution analysis system using pressure liquid feed comprises a plurality of straight-line channels and curved channels connecting the ends of the neighboring straight-line channels. The width w of each curved channel is smaller than the width t of each straight-line channel. The radius of curvature r of each curved channel is set so that the value of a expressed by formula (1) is equal to or smaller than the value of a at a local maximum point of the theoretical step height H expressed by formula (2) and based on the shape of the curved channel. Where, w is a width of the curved channel, u_(c) is a channel passing speed of a solution in the curved channel, is a molecular diffusion inhibition factor by basic members present in the curved channel, and D_(m) is a molecular diffusion coefficient of the solution.


Patent
Tokyo Electron and Shinwa Chemical Industries Ltd. | Date: 2010-03-29

A micro-channel device provided in a solution analysis system using pressure liquid feed comprises a plurality of straight-line channels and curved channels connecting the ends of the neighboring straight-line channels. The width w of each curved channel is smaller than the width t of each straight-line channel. The radius of curvature r of each curved channel is set so that the value of a expressed by formula (1) is equal to or smaller than the value of a at a local maximum point of the theoretical step height H expressed by formula (2) and based on the shape of the curved channel. a=w/r(1)


Trademark
Shinwa Chemical Industries Ltd. | Date: 2012-12-26

Ion-exchange resin; packing materials for use in chromatography columns; adsorbent materials for chromatography, namely, silica gel; chromatography chemicals; chromatographic resin; packing materials for use in liquid chromatography columns. Chromatography columns for laboratory use; packed chromatographic columns for laboratory use in liquid chromatography. Chromatography columns for industrial purposes; packed chromatography columns for industrial purposes.


Trademark
Shinwa Chemical Industries Ltd. | Date: 2012-08-24

Chromatography chemicals; catalytic agents; silica gel for chromatography; packing materials for use in chromatography columns; packing materials for use in gas chromatography columns; adsorbent material for chromatography, namely, chemical adsorbents for laboratory use; unprocessed artificial porous resins for use in chromatography; silicon dioxide. Chromatography apparatus for laboratory use and parts and accessories therefor, namely, columns and pre-columns; chromatography columns.


Trademark
Shinwa Chemical Industries Ltd. | Date: 2012-03-13

Air analysis apparatus; needles for collecting, storing and concentrating air-borne substances for use with air analysis apparatus.


Patent
Tokyo Electron and Shinwa Chemical Industries Ltd. | Date: 2013-01-02

A column for chromatography includes a flow path for allowing a mobile phase, the flow path including mutually-opposing sidewalls and a bottom wall joined to the sidewalls and arranged at bottom ends of the sidewalls; and a plurality of pillars provided to extend along the sidewalls from the bottom wall and regularly arranged at a specified interval. The column is configured to separate individual components from a mixture sample containing multiple kinds of components by using the pillars as a stationary phase. Each of the pillars includes a curved outer surface and the sidewalls partially include a curved surface conforming to the outer surface of each of the pillars. The shortest distance between each of the sidewalls and a pillar positioned closest to said each of the sidewalls is equal to the shortest distance between the pillars in a flow direction of the mobile phase.


Patent
SHINWA CHEMICAL INDUSTRIES Ltd and Tokyo Electron | Date: 2010-12-24

A column for chromatography includes a flow path for allowing a mobile phase, the flow path including mutually-opposing sidewalls and a bottom wall joined to the sidewalls and arranged at bottom ends of the sidewalls; and a plurality of pillars provided to extend along the sidewalls from the bottom wall and regularly arranged at a specified interval. The column is configured to separate individual components from a mixture sample containing multiple kinds of components by using the pillars as a stationary phase. Each of the pillars includes a curved outer surface and the sidewalls partially include a curved surface conforming to the outer surface of each of the pillars. The shortest distance between each of the sidewalls and a pillar positioned closest to said each of the sidewalls is equal to the shortest distance between the pillars in a flow direction of the mobile phase.

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