The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 2008
Filed:
Dec. 20, 2005
Hitoshi Tsuchihashi, Osaka, JP;
Akihiro Miki, Kyoto, JP;
Munehiro Katagi, Osaka, JP;
Mayumi Nishikawa, Osaka, JP;
Kei Zaitsu, Nara, JP;
Hitoshi Tsuchihashi, Osaka, JP;
Akihiro Miki, Kyoto, JP;
Munehiro Katagi, Osaka, JP;
Mayumi Nishikawa, Osaka, JP;
Kei Zaitsu, Nara, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In a sample injector for a gas chromatograph, the present invention improves the throughput of a GC analysis including the derivation of a target compound and reduces the tedious work of handling a reagent for the derivation. According to the present invention, a derivation reagent R is suctioned into a microsyringe, after which a small amount of air and a sample P to be analyzed are successively suctioned so that the reagent, the air and the sample are held in this order, from top to bottom. Then, the needleof the microsyringeis inserted through the septuminto the sample-vaporizing chamber, and the plungeris pushed halfway through so that only the sample is injected into the sample-vaporizing chamber. The sample thus injected is quickly vaporized into a gas sample and introduced into the column, where the target compound contained in the gas sample adheres to the inner wall of an inlet section of the column. When several seconds have passed after the injection of the sample, the plungeris further pushed down to inject the reagent into the sample-vaporizing chamber. Then, the reagent is turned into gas and introduced into the column, where the reagent reacts with the compound to produce a derivative. Subsequently, the temperature of the columnis raised to carry out a GC analysis.