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:
Feb. 19, 2013
Filed:
May. 20, 2008
Kazuo Mukaibatake, Kyoto, JP;
Kazuo Mukaibatake, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
The present invention aims at suppressing noises when a mass analysis is performed by introducing a sample solution into an atmospheric pressure ion source by a pressurized liquid feeding method. As a dilution solvent of the sample solution contained in a sample container, a mixed liquid is used in which the mixture ratio of an organic solvent such as methanol is decreased to 20% and the ratio of water is 80%. Since nitrogen, which is a gas for the pressurization, is soluble in an organic solvent, decreasing the ratio of the organic solvent lowers the saturated dissolution amount and suppresses unstable emergence of the gas in the process of the mass analysis. Consequently, even after the elapse of a considerable length of time from the start of liquid feeding, spike-like noises do not appear in the ion intensity, which stabilizes the ion intensity.