WO2005083416A1 - 質量スペクトルと略同時に吸収・発光・散乱スペクトルを分析する分析装置および分析方法、並びに、エレクトロスプレーイオン化法を用いた質量分析装置および分析方法 - Google Patents
質量スペクトルと略同時に吸収・発光・散乱スペクトルを分析する分析装置および分析方法、並びに、エレクトロスプレーイオン化法を用いた質量分析装置および分析方法 Download PDFInfo
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- WO2005083416A1 WO2005083416A1 PCT/JP2005/002934 JP2005002934W WO2005083416A1 WO 2005083416 A1 WO2005083416 A1 WO 2005083416A1 JP 2005002934 W JP2005002934 W JP 2005002934W WO 2005083416 A1 WO2005083416 A1 WO 2005083416A1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/443—Emission spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0468—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components with means for heating or cooling the sample
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
- H01J49/165—Electrospray ionisation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
Definitions
- the present invention relates to an analysis apparatus and an analysis method for analyzing an absorption 'emission' scattering spectrum almost simultaneously with a mass spectrum, and a mass spectrometer and an analysis method using an electrospray ionization method.
- electrospray ionization method known as one of them is a method utilizing an electrospray (electrostatic spray) phenomenon.
- This ionization method is characterized by being a very soft ionization method because it does not apply high heat or collide with high energy particles when ionizing sample molecules. Therefore, the electrospray ionization mass spectrometry performed using this electrospray ionization method can be used to identify biological macromolecules such as proteins and nucleic acids, drugs, and to analyze molecular structures such as organometallic complexes. Since the sample can be easily deionized without almost destroying the sample, the field of research using these samples is indispensable as an analytical means. .
- various absorption, emission, and scattering spectra such as infrared, visible, and ultraviolet light are not limited to biological macromolecules such as proteins and organometallic complexes in solution, but also species. It is known to be an indispensable analytical tool for obtaining structural information of various chemical substances.
- the compound utilizing these various spectra At the time of structure determination, more reliable analysis results can be obtained by making comprehensive judgments using at least two or more different analysis methods.
- the above-mentioned absorption 'emission' scattering spectrum and mass spectrum can be measured in a short time, and thus are suitable for determining the structure of a chemical species having a very short life. That is, if the test sample can be measured in real time substantially simultaneously by the plurality of scale analysis means, it becomes possible to accurately analyze the structure of an unstable reaction intermediate or the like.
- Non-Patent Document 1 (Naoki Sugimoto, “New Central Dokuma in Biochemistry”, published by Kagaku Dojin (2002)) describes the absorption, emission, scattering, and mass spectra of the same test sample. At the same time, a technical concept of real-time measurement has been proposed by the present inventors.
- Non-Patent Document 1 does not disclose any means for realizing substantially simultaneous measurement of the absorption 'emission' scattering spectrum and the mass vector. Therefore, at present, it was impossible to sample and analyze the mass spectrum and the absorption / emission / scattering spectrum almost simultaneously from the same reaction solution.
- the optimal concentration of a test sample for performing mass spectrometry is 10 x molZL or less, whereas the optimal concentration for measuring an infrared absorption spectrum is small.
- Concentration is lmmol / L or more, visible 'ultraviolet absorption spectrum and emission
- the optimal concentration for measuring the optical spectrum is 100 ⁇ mol / L-10 mmol / L
- the optimal concentration for measuring the Raman scattering spectrum is 10 ⁇ mol / L-lmmol / L. That is, between electrospray mass spectrometry and various types of spectrum measurement, there is a case where the optimal concentration difference is 1000 times or more. Therefore, it was impossible to measure the mass spectrum and the absorption / emission / scattering spectrum almost simultaneously from the same test sample solution.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-157793, May 2003 sets a desired temperature and suppresses heating during ion vaporization more efficiently than the electrospray ionization mass spectrometer of Patent Document 1. Published on 30th)).
- each of the electrospray ionization mass spectrometers disclosed in the above-mentioned patent documents focuses on the point of suppressing the heating of the droplet to be ionized, and suppresses and reduces the heating. Is provided. That is, a cooling means is provided for the purpose of preventing the destruction of the molecular structure of the sample ions caused by the temperature rise due to the application of a high voltage in ion vaporization. Therefore, there is a problem that it is difficult to apply these electrospray ionization mass spectrometers when performing mass spectrometry of a sample that is stable only at an extremely low temperature of ⁇ 45 ° C. or less.
- Patent Documents 1 and 2 described above are electrospray ionization mass spectrometers that use cooling means to cool a nebulizing gas and suppress heating that occurs in a test sample ionized by high voltage application. is there.
- the cooled nebulizing gas can prevent the molecular structure of the sample ions from being destroyed by heating.
- the cooling by the nebulizing gas and the cooling of the desolvation chamber indirectly cool the charged test sample (charge droplet) after the high voltage is applied. It is just doing. In other words, since heat is applied to the test sample from the time when the high voltage is applied, especially when analyzing a test sample that is extremely unstable to heat, the test sample to which heat has already been applied Since the molecular structure of the sample is destroyed, even if it is cooled, no effect is obtained and analysis becomes impossible.
- the temperature of the test sample before applying high voltage also affects the suppression of heat generation when high voltage is applied.
- the temperature of the test sample should be at least as low as the temperature at which the test sample is stable, and more preferably below the temperature at which the test sample is stable. Therefore, in the disclosed device as described above, the mass fraction of the test sample that is stable only at cryogenic temperatures This is an insufficient configuration for performing analysis.
- Patent Document 2 discloses that an error is corrected by a correction table created in advance and precise temperature control is performed. However, the temperature set by the temperature controller and the actual test sample are cooled. The temperature of the test sample may be higher than the set temperature due to the difference between the temperature and the set temperature. is not.
- the structure of these electrospray ionization mass spectrometers is a sprayer having a capillary for discharging a test sample solution, and a sheath tube having a coaxial shape with the capillary and having a nebulizing gas passing therethrough. It has.
- the outer periphery of the sheath tube has a structure connected to a sprayer to which a high voltage is applied.
- a sprayer to which a high voltage is applied.
- this phenomenon was performed using a sample that is unstable only at extremely low temperatures of about -145 ° C or lower and is unstable due to heat, which is a preferable test sample for the elect-port spray ionization mass spectrometer of the present invention. This is noticeable in some cases.
- a test sample that is stable only at cryogenic temperatures must minimize the heat applied during its ion vaporization. It is as follows. As described above, when dew condensation occurs on the outer periphery of the sheath tube, the electrospray ionization mass spectrometer having the above-described structure causes the dew condensation to flow to the high voltage application unit of the sprayer for some reason. In such a case, there is a danger that a short circuit or an electric shock may be caused when a high voltage is applied.
- an object of the present invention is to provide an analyzer capable of performing mass spectrum analysis and absorption / emission 'scattering analysis at substantially the same time.
- the above-mentioned analyzer that can perform mass spectrometry without decomposing by heat is provided. Even when using a sample that is not only stable but is unstable due to heat, it can perform mass spectrometry without causing thermal decomposition. It is to provide a preionization mass spectrometer.
- the inventors of the present application have conducted intensive studies in view of the above problems, and as a result, even when a relatively high-concentration test sample used for measurement of an absorption 'emission' scattering spectrum was used, It has been found that ions can be vaporized and the mass scale can be measured, and the present invention has been completed.
- the analyzer according to the present invention includes an absorption / emission / scattering spectrum analyzer that analyzes at least one of an absorption spectrum, an emission spectrum, and a scattering spectrum;
- An analyzer comprising a mass spectrometer that performs analysis on the same test sample as the absorption / emission / scattering spectrum analyzer and the mass spectrometer.
- the analyzer of the present invention can solve the problem of the optimum concentration difference, and can perform mass spectrum analysis and absorption / emission / scattering spectrum analysis substantially simultaneously.
- Mass spectrometry and absorption 'emission' scattering spectroscopy can be performed almost simultaneously using the same test sample, allowing direct observation of biological reactions, elucidation of biological functions using model metal complexes, Since analysis using multiple spectra is possible in the analysis of reaction intermediates, etc., it is possible to obtain information with high reliability and to obtain information.
- the ion introduction amount control means is provided in an ionization chamber provided in the mass spectrometer.
- the ion introduction amount control means can be adjusted in position by a position adjustment knob.
- test sample ions to be vaporized and the mobility of the test sample ions discharged in the direction of the ion extraction electrode (orifice) due to the tip force of the capillary differ depending on the solvent in which the test sample is dissolved.
- the amount of test sample ions introduced into the mass spectrometer varies depending on these conditions. That is, the control amount of the test sample ion amount varies depending on these conditions.
- the ion introduction amount control means adjusts the position by the position adjustment knob. Being able to do this makes it possible to control the amount of test sample ions introduced into the mass spectrometer to an optimal amount.
- the ion introduction amount control means is a non-conductive material.
- the ion introduction amount control means has a mesh structure.
- the ion introduction amount control means has a mesh structure, which does not change the structure of the conventional electrospray ionization mass spectrometer, and is attached to the conventional electrospray ionization mass spectrometer. Therefore, it is possible to provide an analyzer that can easily handle a high-concentration test sample without significantly changing the manufacturing efficiency of the conventional electrospray ionization mass spectrometer.
- the diameter of the through-hole constituting the network structure of the ion introduction amount control means is preferably in the range of 1 ⁇ ⁇ 5 mm.
- the test sample to be ionized has different wettability and the like depending on the type.
- the wettability in the present invention refers to the affinity of an ionized test sample with respect to the ion introduction amount control means. Therefore, the size of the through-hole that constitutes the mesh structure is Need to correspond to the nature of the test sample. In other words, by setting the size of the through hole in the above range, it is possible to respond to various types of high-concentration test samples, and a constant amount of ions is always mass regardless of the high-concentration test sample. It can be introduced into the analysis department.
- the above-mentioned absorption / emission / scattering spectrum analyzer analyzes at least one of an infrared absorption spectrum, a visible-ultraviolet absorption spectrum, a fluorescence spectrum, and a Raman scattering spectrum. .
- the test sample is preferably temperature-controlled.
- the inventors of the present application have conducted intensive studies in view of the above-described problems. As a result, by cooling the test sample before being introduced into the sprayer, the heat generated due to the ionization was more effectively reduced. I found that it was possible to suppress it.
- the analyzer according to the present invention is an electrospray ionization mass spectrometer, wherein the mass spectrometer is provided with a sprayer that ionizes and vaporizes the test sample solution by applying a high voltage, First cooling means for cooling the test sample solution before being introduced into the absorption 'emission' scattering spectrum analyzer and the mass spectrum analyzer; the sprayer; Preferably, a second cooling means for cooling the test sample is provided.
- the second cooling means has a structure independent of the sprayer.
- test sample is directly cooled by the second cooling means, so that the heating of the test sample when a high voltage is applied is effectively suppressed. It becomes possible.
- the second cooling unit cools a region of the sprayer including at least a high-voltage application unit.
- the second cooling means is configured to cool at least a region including the high voltage application unit in the sprayer, so that the high voltage application unit of the sprayer, which is a heat source, and its surroundings are concentrated. It becomes possible to cool it.
- the analyzer according to the present invention can effectively cool the test sample to which a high voltage is applied, in addition to the above-described effects, and generate molecules of the test sample ion by heat during ionization. Structural destruction can be further suppressed.
- the second cooling means is a gas inlet pipe for discharging low-temperature inert gas.
- the sprayer can be cooled effectively. That is, since the opening of the gas introduction pipe can be brought close to the portion of the sprayer to be cooled, the sprayer can be cooled effectively.
- the analyzer of the present invention can effectively cool the sprayer and the test sample to which a high voltage is applied. As a result, it is possible to further suppress the heat generated during ion vaporization. That is, it is possible to further suppress the destruction of the molecular structure of the test sample ion due to heat during ion vaporization.
- the discharge direction of the low-temperature inert gas is more than 30 ° relative to the discharge direction of the nebulizing gas that assists discharge of the test sample to which the high voltage is applied.
- it is inclined by 60 °.
- the low-temperature inert gas is discharged so as to be synchronized with the discharge direction of the nebulizing gas.
- the cooled low-temperature inert gas together with the nebulizing gas, assists the movement of the test sample discharged from the capillary.
- the temperature of the nebulizing gas becomes lower due to the temperature of the low-temperature inert gas, and it becomes possible to cool the test sample ions discharged from the cavity.
- the discharge flow rate per unit area at the discharge port of the low-temperature inert gas is a unit at the discharge port of the nebulizing gas that assists the discharge of the test sample to which the high voltage is applied.
- the discharge flow rate per area is preferably equal to or less than the discharge flow rate.
- the nebulizing gas is used to assist the effective introduction of the atomized test sample discharged from the cavities into the ion extraction electrode.
- the gas must be discharged at a rate that does not affect the emission of nebulizing gas. For this reason, by setting the discharge speed to be equal to or lower than the nebulizing gas discharge speed, it is possible to cool the sprayer without affecting the discharge direction of the atomized test sample discharged from the capillary.
- the discharge flow rate per unit area at the discharge port is a numerical value expressed in the unit of mL / (minute X cm 2 ).
- the first cooling means and the second cooling means have a structure capable of adjusting the temperature.
- test sample is a reaction solution, and the reaction is completed with a reaction initiation force of several seconds.
- the analyzer according to the present invention has a high effect.
- the same sample can be used for measurement at the same time using a plurality of various spectra that can be measured in a short time, even if the test sample completes the reaction within a few seconds from the start of the reaction, Accurate information on intermediates can be obtained.
- the analysis method according to the present invention includes an absorption 'emission' scattering spectrum analysis step of analyzing an absorption spectrum, an emission spectrum, and a scattering spectrum of a test sample; A mass spectrum analysis step of controlling the amount of test sample ions obtained by the chemical analysis to analyze the mass spectra, wherein the absorption-emission / scattering spectrum analysis step and the mass spectrum analysis step are performed. Are performed almost simultaneously in real time.
- a test sample such as a chemical reaction solution that changes every moment can be analyzed almost simultaneously and in real time by an absorption 'emission' scattering spectrum and a mass spectrum.
- the difference in the optimum concentration difference between the two which has been a problem so far, is eliminated by controlling the amount of ionized test sample ions, thereby obtaining the structure of the chemical reaction intermediate.
- in real time means "in time”, meaning that a test sample such as a chemical reaction solution that changes every moment is analyzed in time. I'll do it.
- the analysis method according to the present invention is characterized in that the ionization method in the above-mentioned mass spectrum analysis step is performed by performing electro- mass spectrometry of the test sample using a sprayer which ionizes and vaporizes the test sample solution by applying a high voltage.
- the electrospray ionization method By using the electrospray ionization method, it is possible to perform mass spectrometry analysis of a test sample in a solution state. In addition, since the test sample solution can be measured, it becomes possible to analyze the reaction process in the solution in real time until the end of the reaction. In addition, as described above, the electrospray ionization method utilizes an electrospray (electrostatic spray) phenomenon. Therefore, when biomolecules such as proteins and nucleic acids and drugs are identified, and molecular structures such as organometallic complexes are analyzed, these samples can be easily ionized without being almost destroyed. .
- electrospray electrostatic spray
- the sprayer in the second cooling step, it is preferable that the sprayer is cooled in advance before the test sample is introduced into the sprayer.
- the sprayer is cooled before the test sample solution is introduced, and maintains the test sample solution at a low temperature until immediately before a high voltage is applied to the test sample solution. Can be maintained. Therefore, since the test sample solution can be effectively cooled, it is possible to prevent the molecular structure of the test sample from being destroyed by heat generated in the test sample when the sample is ionized.
- test sample is a sample that is stable only at a temperature of less than or equal to 45 ° C.
- the electrospray ionization mass spectrometer according to the present invention has an electrospray ionization mass spectrometer equipped with a sprayer for applying a high voltage to vaporize a test sample in order to solve the above-mentioned problem.
- the mass spectrometry using the electrospray ionization mass spectrometer utilizes the electrospray (electrostatic spray) phenomenon as described above. Therefore, when biomolecules such as proteins and nucleic acids and drugs are identified, and molecular structures such as organometallic complexes are analyzed, these samples can be easily ionized without being almost destroyed. Therefore, in research using these samples, this device is indispensable as one of the structural analysis means.
- the electrospray ionization mass spectrometer according to the present invention is provided with first cooling means for cooling the test sample solution before being introduced into the sprayer, and introduced into the sprayer and the sprayer. And a second cooling means for cooling the test sample solution. That is, the electrospray ionization mass spectrometer according to the present invention includes two-stage cooling means for a test sample to be ionized. In particular, since the test sample before being introduced into the sprayer is cooled by the first cooling means, the test sample can be effectively cooled as compared with the conventional apparatus.
- the electrospray ionization mass spectrometer according to the present invention preferably has a structure independent of the second cooling means and the sprayer.
- test sample is directly cooled by the second cooling means.
- the electrospray ionization mass spectrometer of the present invention is provided with two-stage cooling means for the test sample and directly cools the test sample to which a high voltage is applied.
- the heat generated in the test sample ions due to vaporization can be effectively suppressed, and stable mass spectrometry of the test sample can be performed only at extremely low temperatures.
- the second cooling means cools a region of the sprayer including at least a high-voltage application unit.
- the cooling method used in the electrospray ionization mass spectrometer described in Patent Documents 1 and 2 suppresses the heat of the test sample, which generates heat during ion vaporization, and prevents the destruction of the molecular structure of the test sample ions.
- the indirectly charged test sample was cooled through a nebulizing gas cooled by a refrigerant such as liquid nitrogen and the de-solution chamber.
- This cooling method does not effectively cool the test sample.In particular, when the test sample is a sample that is stable only at extremely low temperatures, such insufficient cooling may cause the destruction of the molecular structure. It becomes high.
- the second cooling means is configured to cool at least a region including the high voltage application unit in the sprayer, so that the high voltage application unit of the sprayer, which is a heat source, and its surroundings are concentrated. It becomes possible to cool it.
- the test sample to which a high voltage is applied can be effectively cooled, and the destruction of the molecular structure of the test sample ions due to heat during ion vaporization can be further suppressed.
- the second cooling means is a gas introduction pipe for discharging a low-temperature inert gas.
- the sprayer can be effectively cooled. That is, since the opening of the gas introduction pipe can be brought close to the portion of the sprayer to be cooled, the sprayer can be cooled effectively.
- the electrospray ionization mass spectrometer of the present invention can effectively cool the sprayer and the test sample to which a high voltage is applied, and further reduce the heat generated during ion vaporization. It can be suppressed. That is, it is possible to further suppress the destruction of the molecular structure of the test sample ions due to heat during ion vaporization.
- the second cooling means described above does not change the structure of the conventional electrospray ionization mass spectrometer.
- the second cooling means is attached to the conventional electrospray ionization mass spectrometer. Therefore, it is possible to provide the electrospray ionization mass spectrometer according to the present invention without significantly changing the manufacturing efficiency of the conventional electrospray ionization mass spectrometer.
- the discharge direction of the low-temperature inert gas is such that the discharge direction of the nebulizing gas assists the discharge of the test sample solution to which the high voltage is applied. 30 ° — preferably 60 °.
- the nebulizing gas is for assisting the effective introduction of the discharged atomized test sample into the ion extraction electrode. Therefore, since the low-temperature inert gas is discharged toward the sprayer in the above-described direction, the low-temperature inert gas can effectively cool the sprayer without displacing the discharging direction of the nebulizing gas. Become. If the temperature is out of the above-mentioned range and is less than 30 ° with respect to the nebulizing gas discharge direction, the low-temperature inert gas cannot effectively cool the sprayer, and the nebulizing gas discharge direction cannot be reduced. When the angle is 60 ° or more, the discharge of the low-temperature inert gas impedes the discharge direction of the nebulizing gas.
- the low-temperature inert gas is discharged so as to be synchronized with the discharge direction of the nebulizing gas.
- the cooled low-temperature inert gas together with the nebulizing gas, assists the movement of the test sample discharged from the capillary.
- the temperature of the nebulizing gas is lowered by being affected by the temperature of the low-temperature inert gas, and it becomes possible to cool the test sample ions discharged from the capillary.
- the discharge flow rate per unit area at the discharge port of the low-temperature inert gas is such that the nebule assists discharge of the test sample solution to which a high voltage is applied. It is preferable that the gas is discharged at a discharge flow rate per unit area or less at a discharge port of the licing gas.
- the nebulizing gas is for assisting the effective introduction of the atomized test sample discharged from the cavities into the ion extraction electrode, as described above.
- the gas must be discharged at a rate that does not affect the emission of nebulizing gas. Therefore, by making the discharge speed of the nebulizing gas or lower the sprayer, it is possible to cool the sprayer that does not affect the discharge direction of the atomized test sample discharged from the cabillary.
- the discharge flow rate per unit area at the discharge port is a numerical value expressed in the unit of mL / (minute X cm 2 ).
- the first cooling means and the second cooling means have a temperature adjustable configuration.
- the electrospray ionization mass spectrometry method is an electrospray ionization mass spectrometry method including a sprayer for applying a high voltage to ionize a test sample solution to ionize the test sample solution.
- a cooling step is provided.
- a high voltage is applied to the sprayer to ionize the test sample solution.
- the sprayer in the second cooling step, is cooled beforehand before the test sample solution is introduced into the sprayer. But preferred.
- the sprayer is cooled in advance before the test sample solution is introduced, and maintains the test sample solution at a low temperature until immediately before a high voltage is applied to the test sample solution. Can be maintained.
- test sample solution can be effectively cooled, it is possible to prevent the molecular structure of the test sample from being destroyed by the heat generated in the test sample when the sample is ionized.
- the test sample is preferably a sample that is stable only at a temperature of 45 ° C or less.
- FIG. 1 is a perspective view showing a basic structure of an analyzer according to the present invention.
- FIG. 2 is an enlarged perspective view of an ionizing chamber of the analyzer according to the present invention.
- FIG. 3 is a chemical reaction formula of iron (III) complex and 13-HPOD in an embodiment of the analyzer according to the present invention.
- FIG. 4 (a) is a graph showing the mass spectrum of the iron (III) complex and 13-HPOD at the start of the reaction (0 seconds) in the example of the analyzer according to the present invention, and the mass number 677.
- FIG. 4B is a spectrum analysis diagram in which the ionic strength of the iron ( ⁇ ) is plotted against time, and (b) is the mass spectrum 7 seconds after the start of the reaction between the iron ( ⁇ ) complex and 13-HPOD in the embodiment of the analyzer according to the present invention.
- FIG. 3 is a graph showing the outer diameter and a statistic analysis diagram in which the ionic strength at a mass number of 929 is plotted against time.
- FIG. 4 (c) shows the iron (III) in the embodiment of the analyzer according to the present invention.
- FIG. 3 is a graph showing a mass spectrum 12 minutes after the start of the reaction between the complex and 13-HPOD, and a spectrum analysis diagram in which the ionic strength of mass number 911 is plotted against time.
- FIG. 5 (a) shows the visible ultraviolet absorption spectra at the start of measurement (0 seconds) ((A) in the figure) and after 7 seconds ((B) in the figure) in the embodiment of the analyzer according to the present invention.
- FIG. 3B is a graph showing visible ultraviolet absorption statues after 7 seconds ((B) in the figure) and 12 minutes ((C) in the figure) after the start of the reaction.
- FIG. 6 is a chemical reaction formula showing a reaction between 13-HPOD and EtN in an embodiment of the analyzer according to the present invention.
- FIG. 7 is a perspective view showing a basic structure of one embodiment of the electrospray ionization mass spectrometer according to the present invention.
- FIG. 8 is a chemical structural formula of a manganese (IV) methoxy complex used in an example of the electrospray ionization mass spectrometer according to the present invention.
- FIG. 9 (a) is a chemical reaction formula for producing a manganese (IV) peroxo complex measured in the example of the electrospray ionization mass spectrometer according to the present invention
- (b) is FIG. 4 is a graph showing the mass spectrum of a manganese (IV) peroxo complex in an example of the electrospray ionization mass spectrometer according to the present invention
- (c) is an electrospray ionization mass spectrometer according to the present invention.
- a statistic plotting the ionic strength of the manganese (IV) peroxy complex (mass number 716) detected in the embodiment of the apparatus against time.
- FIG. 10 is a perspective view showing a basic structure of another embodiment of the analyzer according to the present invention.
- FIG. 2 schematically shows a state in which a large amount of charged ions are discharged into the ionizing chamber of the analyzer according to the present invention.
- the charged ions in the ioni are discharged into the ionizing chamber of the analyzer according to the present invention.
- the mass spectrometer After passing through the ion extraction electrode (orifice), the mass spectrometer is measured in the subsequent mass spectrometer.
- an ion introduction control means 8 for controlling the amount of test sample ions flowing into the mass spectrometer (not shown) is provided on the sprayer side from the introduction port of the ion extraction electrode.
- the amount of test sample ions introduced into the mass spectrometry unit is approximately the same as the amount of test sample ions in the state where the test sample having the optimum concentration in the conventional mass spectrometer is ionized and vaporized. . Therefore, it becomes possible to measure the mass spectrum with a normal amount of ions. This will be described in detail below.
- the ion introduction control means 8 has a mesh structure provided with a plurality of holes penetrating from the ionization chamber side to the ion extraction electrode side.
- the diameter of the through hole is in the range of 1 / im-5mm. This diameter is appropriately set depending on the problem of wettability of the test sample and the like. If the test sample has a higher concentration than the optimal test sample used for conventional mass spectrometry, a high voltage is applied to the high-concentration test sample in the ionization chamber. Apply to make the test sample charged ions. A large amount of ionized test sample ions move toward the ion extraction electrode as usual.
- the amount of ions introduced into the ion extraction electrode is controlled by the ion introduction control means provided at the position described above. That is, the test sample ions generated in large quantities are divided into test sample ions adhering to the surface of the ion introduction control means and test sample ions passing through the hole through the ion introduction control means to the ion extraction electrode side. By dividing, the amount of test sample ions introduced into the mass spectrometer can be reduced.
- the analyzer according to the present invention can measure a mass spectrum normally even when the concentration of the test sample is higher than the optimum concentration in the analysis.
- FIG. 1 is an example of an analyzer according to the present invention, and is a diagram showing a basic structure of an analyzer 10 using a test sample adjusted to a concentration equal to or higher than the optimum concentration for mass spectrometry, that is, higher than the optimum concentration. is there.
- the analyzer 10 shown in Fig. 1 has an absorption 'emission' scattering spectrum analyzer 30 for analyzing at least one of the absorption spectrum 'emission spectrum and scattering spectrum', and an analysis system for analyzing the mass spectrum. And a mass spectrum analyzer 20.
- the absorption 'emission' scattering spectrum analyzer 30 and the mass spectrum analyzer 20 are both connected to the reaction vessel 1 containing the test sample, and the same test sample is to be analyzed.
- a high voltage is applied to the test sample in the analyzer 10, and the test sample ion that has been ionized is passed through the ion introduction control means 8 provided in the ionization chamber to thereby introduce the test sample.
- a mass spectrometer 20 is provided to measure the mass spectrum by controlling the amount of sample ions.At the same time, the absorption spectrum and the emission spectrum are measured using the same test sample as the test sample for the mass spectrum measurement.
- An absorption / emission / scattering spectrum analyzer 30 capable of measuring a spectrum 'scattering spectrum is provided.
- the analyzer 10 described in the present embodiment is described based on an electrospray ionization mass spectrometer equipped with an electrospray ionization method, but the present invention is not limited to this. Not something.
- the analyzer 10 includes a reaction vessel 1, an inert gas introduction pipe 2, and a capillary 3 , A sprayer 4, a magnetic stirrer controller 5, a thermostat 6, a sheath tube 7, an ion introduction amount control means 8, an ion extraction electrode 9, and a spectrum observation probe 12.
- the inert gas introduction tube 2, the capillary 3, the sprayer 4, the sheath tube 7, the ion introduction amount control means 8, and the ion extraction electrode 9 are provided in the mass spectrum analyzer 20.
- the above-described spectrum observation probe 12 is provided in an absorption 'emission' scattering spectrum analyzer 30.
- the reaction vessel 1 is filled with the solution containing the test sample as described above, is installed in the constant temperature bath 6 described below, and is controlled to a predetermined temperature. Further, in the reaction container 1, there is a magnetic stirrer for stirring the test sample solution in the container by the magnetic stirrer controller 5, also described later. Therefore, the reaction container 1 is installed in the constant temperature bath 6 and can stir the test sample in a temperature-controlled state to make the temperature of the test sample uniform. Further, an inert gas inlet tube 2, a capillary 3 and a spectrum observation probe 12 described later are arranged at the upper part of the reaction vessel 1, and the upper part of the reaction vessel 1 is fixed with a rubber for the purpose of fixing them. A stopcock is located. As the structure of the reaction vessel 1, any material can be used as long as it can be installed in the thermostat 6, for example, glass or stainless steel.
- the magnetic stirrer controller 5 is provided for stirring the test sample solution in the reaction vessel 1 installed in the thermostated soda 6 as described above.
- the above-mentioned magnetic stirrer controller 5 is used as the above-mentioned stirring means.
- the stirring means which can make the temperature of the test sample solution and the test sample solution concentration uniform is not limited to this. It may be a mechanical type as long as it is provided.
- a solvent for the test sample solution a solvent for the test sample solution analyzed by a conventional electrospray ionization mass spectrometer may be used. , Methanol or an acetonitrile solution as described below.
- concentration of the test sample solution varies depending on the ionization efficiency of the test sample by electrospray.For high molecular weight compounds such as proteins and nucleic acids, the range of about 11 SOpmol / zzL is preferable, For compounds, about 11 A range of 50 ng / ⁇ L is preferred.
- One end of the inert gas introduction pipe 2 is in contact with the test sample solution in the reaction vessel 1 at one end of the upper part of the reaction vessel 1, specifically, one end of the inert gas introduction pipe 2 is contacted.
- the inert gas is introduced from an inert gas source (not shown) from the other end.
- the pressure of the introduced inert gas is adjusted by a pressure regulator (not shown).
- the pressure of the inert gas is adjusted so that the flow rate of the test sample solution sent from the capillary 3 to the sprayer 4 is preferably 24 a LZ, more preferably about 3 a LZ.
- the inert gas introduction pipe 2 for example, a PTFE tube having an inner diameter of 0.8 mm and an outer diameter of 1.58 mm can be used, but the inert gas introduction pipe 2 in the present embodiment is not limited thereto. Not something. Note that, for example, an argon gas or the like can be used as the inert gas.
- the capillary 3 connects the reaction vessel 1 and the sprayer 4, and the test sample solution in the reaction vessel 1 is formed by the inert gas introduced from the inert gas introduction pipe 2. It is passed through the capillary 3 by pressure and sent to the sprayer 4.
- the length of the capillary 3 is preferably relatively short in order to minimize the temperature change of the test sample solution whose temperature is controlled by the thermostat 6 and to minimize the measurement time lag.
- the force S at which a deactivated silica capillary tube having a length of 20 cm and an inner diameter of 0.075 mm can be used, and the capillary 3 in the present embodiment are not limited to these.
- the sprayer 4 has a double structure in which the sheath tube 7 described later is formed coaxially with the capillary 3.
- the test sample solution introduced into the capillary 3 is discharged from the capillary 3 at one end.
- the voltage applied to the sprayer 4 is preferably in the range of about 3-6 kV, more preferably in the range of about 4-5 kV.
- the operator can also adjust the tip of the sprayer 4 to an optimum position by using a position adjustment knob (not shown) while watching the analysis spectrum of the test sample. It is possible to obtain a suitable analysis spectrum.
- the constant temperature bath 6 is provided as a temperature control means for controlling the temperature of the test sample solution in the reaction container 1 as described above.
- the constant temperature bath 6 for example, the temperature of the constant temperature bath 6 containing water can be controlled, and the temperature of the test sample solution in the reaction container 1 can be controlled by placing the reaction container 1 in the constant temperature bath 6. .
- liquid nitrogen can be used, and the test sample solution can be cooled by immersing the reaction vessel 1 in liquid nitrogen. it can.
- the use of liquid nitrogen makes it possible to measure test samples that are stable only at low temperatures, such as extremely low temperatures.
- the reaction vessel 1 which is not limited to a coolant such as water as described above, is tightly attached. It is also possible to use a metal provided with a structure that can be held. That is, by controlling the temperature of this metal by an electronic device or the like, it is possible to install the reaction vessel 1 in close contact with the metal and control the temperature of the test sample solution in the reaction vessel 1.
- the metal has relatively high thermal conductivity, such as copper or aluminum.
- the sheath tube 7 is formed coaxially with the outside of the capillary 3, and the nebulizing gas supplied from the nebulizing gas supply source (not shown) Discharge coaxially with the test sample discharged from capillary 3.
- the ion introduction amount control means 8 controls the amount of test sample ions discharged from the end of the capillary 3 when a high voltage is applied to the sprayer 4 and introduced into the ion extraction electrode 9. It is provided in order to. The details will be described below.
- the ion introduction amount control means 8 is supported in the ionization chamber by support means (not shown). Specifically, the test sample force is provided between the position where the tip force of the capillary 3 is discharged while the S ion is vaporized and the ion extraction electrode 9, and the ion introduction amount control means 8 is provided with the ion vaporization means 8. It is provided so as to be substantially perpendicular to the moving direction of the test sample ions.
- the ion introduction amount control means 8 preferably has a network structure composed of a plurality of through holes, and the opening of the through hole has a test sample from the capillary 3. It is preferably provided so as to be directed to the ion discharge side and the ion extraction electrode 9 introduction side.
- the size of the ion introduction amount control means 8 is preferably a size covering the diffusion range of test sample ions that are discharged from the capillary 3 and diffuse in the direction of the ion extraction electrode 9. It is preferable to have a size that covers the 9 inlets.
- the installation position of the ion introduction amount control means 8 is the above-mentioned position, that is, the test sample power W on. There is no particular limitation as long as it is provided between the position where the tip force of the capillary 3 is also discharged while being vaporized and the ion extraction electrode 9. However, if the size of the ion introduction amount control means 8 does not cover the above-mentioned diffusion range, the installation position of the ion introduction amount control means 8 is determined by the introduction port of the ion extraction electrode 9. Preferably, it is near.
- the through hole has a diameter in the range of 1 ⁇ 5 mm.
- the reason for setting the above range is that the test sample to be ionized has different wettability depending on its type, and it is preferable to appropriately set the diameter according to the difference in the properties.
- the thickness of the ion introduction amount control means 8 is preferably relatively thin. Specifically, it is preferably in the range of 1 / im-1 mm.
- the thickness of the ion introduction amount control means 8 is the width of the ion introduction amount control means 8 with respect to the moving direction of the test sample ions.
- the reason for setting the above range is that if the thickness of the ion introduction amount control means 8 becomes relatively thick, the test sample ions adhere to the wall of the through hole while passing through the through hole, and the ion This is because the control by the introduction amount control means 8 cannot be performed accurately.
- the operator can adjust the position of the ion introduction amount control means 8 to an optimum position by a position adjustment knob (not shown) while the operator looks at the analysis spectrum of the test sample. This makes it possible to obtain the optimal analysis spectrum. It is possible.
- the ion introduction control means 8 has a detachable structure, and when the concentration of the test sample is the optimum concentration for the mass spectrum measurement, it is removed from the position shown in FIG. It is also possible. That is, the analyzer 10 in the present embodiment does not necessarily perform the absorption / emission / scattering spectrum measurement simultaneously with the mass spectrum measurement, but can also measure both independently.
- the analyzer 10 according to the present embodiment is different from the conventional mass spectrometer in that the ion introduction amount control means 8 is provided from the tip of the capillary 3 to the ion extraction electrode 9.
- the analyzer 10 of the present embodiment uses the mass spectrometry to measure the absorption, emission, and spread of the L-sperm having an optimum concentration higher than the test sample concentration optimum for mass spectrometry. It is possible to perform almost simultaneously from the same test sample.
- the ion extraction electrode 9 guides the charged test sample discharged from the sprayer 4 to the ion extraction electrode 9.
- the charged test sample ions that have been induced and passed through the ion extraction electrode 9 are analyzed for mass number by a mass spectrometer (not shown).
- the spectrum observation probe 12 is provided so that one end thereof is located in the test sample in the reaction container 1.
- the absorption spectrum, emission spectrum, and scattering spectrum of the test sample in the reaction container 1 are measured by the spectrum observation probe 12.
- the ionization method of the analyzer 10 in the present embodiment is preferably performed using an electrospray ionization method.
- an electrospray ionization method By using the electrospray ionization method, it is possible to perform mass spectrometric analysis of the test sample in a solution state. In addition, since the test sample solution can be measured, it is possible to perform real-time spectrum analysis of the process from the start to the end of the reaction in the solution.
- the electrospray (electrostatic spray) phenomenon is used. Therefore, when biomolecules such as proteins and nucleic acids and drugs are identified, and molecular structures such as organometallic complexes are analyzed, these samples can be easily ionized without being almost destroyed. [0145] Therefore, when analyzing a reaction intermediate or the like using these samples, an accurate mass spectrum can be measured by using the electrospray ionization method.
- the analyzer 10 includes three mass spectrometers such as a mass spectrum, an absorption spectrum, and an emission spectrum that can be measured only by simultaneous measurement of two spectra such as a mass spectrum and an absorption spectrum, and a mass spectrum and an emission spectrum.
- the above spectra, or even the mass spectrum, the absorption spectrum, the emission spectrum, the scattering spectrum, and the four spectra may be analyzed almost simultaneously.
- the operator can appropriately select from a plurality of spectra for analysis, and thus the analyzer 10 is provided with a spectrum selecting means, not shown.
- a test sample solution is prepared by adding a solvent to the test sample, and the test sample solution is placed in the reaction vessel 1 and placed in the thermostat 6 whose temperature has been adjusted.
- the test sample solution in the reaction vessel 1 is stirred by a magnetic stirrer controlled by a magnetic stirrer controller 5.
- the above-described reaction is performed almost simultaneously with the above-described mass spectrum analysis step.
- the test sample solution in the reaction vessel 1 is subjected to at least one spectrum analysis of the absorption 'emission' scattering spectrum by the spectrum observation probe 12 described above. This step is the absorption 'emission' scattering spectrum analysis step.
- the analysis method according to the present embodiment uses a mass spectrum, an absorption spectrum, and an emission spectrum that can be measured only by simultaneous measurement of two spectra such as a mass spectrum and an absorption spectrum and a mass spectrum and an emission spectrum. More than one spectrum, or even four spectra, such as a mass spectrum, an absorption spectrum, an emission spectrum, and a scattering spectrum, may be analyzed almost simultaneously. In such a case, a spectrum to be analyzed can be appropriately selected by a spectrum selector (not shown).
- Electrospray ionization mass spectrometer according to the present invention
- the electrospray ionization mass spectrometer 120 of the present invention employs a very soft ionization method utilizing the electrospray (electrostatic spray) phenomenon as described above. Therefore, it has become an indispensable analytical means when identifying biomolecules such as proteins and nucleic acids and drugs and drugs, and molecular structures such as organometallic complexes as test samples.
- the above-described electrospray ionization mass spectrometer 120 is a suitable analysis means for a test sample which becomes unstable due to heat which is not stable at only a very low temperature.
- test sample that is stable only at extremely low temperatures is, in the present embodiment, a temperature of about 145 ° C and a sample that is stable only at about ⁇ 45 ° C.
- the test sample suitable for the present invention is not limited thereto, for example, a manganese (IV) peroxo complex—a metal hydride-peroxo complex.
- FIG. 7 is a schematic diagram showing a configuration of an electrospray / f-on mass spectrometer 120 according to the present invention.
- the electrospray ionization mass spectrometer 120 includes a reaction vessel 101, an inert gas inlet tube 102, a capillary 103, a sprayer 104, a magnetic stirrer controller 105, a low-temperature bath 106 (first cooling means), a sheath tube 107, The cooling gas introduction pipe 108 (second cooling means) and the ion extraction electrode 109 are provided.
- the reaction vessel 101 is filled with the solution containing the test sample as described above, is set in the low-temperature bath 106 described below, and is controlled at a predetermined temperature.
- reaction vessel 101 there is a magnetic stirrer for stirring the test sample solution in the vessel by the magnetic stirrer controller 105 also described later. Therefore, the reaction vessel 101 is placed in the low-temperature bath 106, and in a cooled state, the test sample can be stirred to make the temperature of the test sample uniform. Further, an inert gas introduction pipe 102 and a capillary 103 are arranged on the upper part of the reaction vessel 101, and a rubber stopper is arranged on the upper part of the reaction vessel 101 for the purpose of fixing them.
- any material can be used as long as it can be installed in the low-temperature bath 106, for example, glass or stainless steel.
- the magnetic stirrer controller 105 is provided with a force provided for stirring the test sample solution in the reaction vessel 101 installed in the low-temperature bath 106 in the present embodiment.
- the mechanical stirrer controller 105 is not limited to the above-mentioned magnetic stirrer controller 105, but may be a mechanical stirrer provided that it has a stirring means capable of making the temperature of the test sample solution uniform.
- the solvent of the test sample solution may be a solvent of the test sample solution analyzed by a conventional electrospray ionization mass spectrometer, and may be suitably used according to the properties of the test sample. Alternatively, methanol alone is preferable, and a methanol-dichloromethane solution as described later is preferable.
- the concentration of the test sample solution varies depending on the ionization efficiency of the test sample by electrospray.For high molecular weight compounds such as proteins and nucleic acids, the range of about 120 pmol // iL is preferably 100 ODa or less. For low molecular weight compounds, a range of about 1 to 50 ng / zL is preferred.
- test sample having a concentration of 100 zmol / L can be used for a test sample that is only stable at an extremely low temperature such as 45 ° C., which is particularly suitable for the electrospray ionization mass spectrometer 120. .
- One end of the inert gas introduction pipe 102 is located above the reaction vessel 101, specifically, one end of the inert gas introduction pipe 102 is not in contact with the test sample solution in the reaction vessel 101. From the other end, an inert gas source (not shown) Is introduced. The pressure of the inert gas introduced is adjusted by a pressure regulator (not shown). By adjusting the pressure of the inert gas, the test sample solution in the reaction vessel 101 is sent to the sprayer 104 through the later-described capillary 103.
- the inert gas introduction pipe 102 for example, a force S that can use a PTFE tube having an inner diameter of 0.8 mm and an outer diameter of 1.58 mm
- the inert gas introduction pipe 102 in the present embodiment is It is not limited to this.
- an argon gas or the like can be used as the inert gas.
- the capillary 103 connects the reaction vessel 101 and the sprayer 104, and the test sample solution in the reaction vessel 101 is formed by an inert gas introduced from the inert gas introduction pipe 102.
- the pressure is passed through the capillary 103 and sent to the sprayer 104.
- the length of the capillary 103 is relatively short in order to minimize the temperature rise of the test sample solution cooled by the low-temperature bath 106.
- a silica capillary tube can be used, but the capillary 103 in the present embodiment is not limited to this.
- the sprayer 104 has a double structure in which the sheath tube 107 described later has the same axial shape as the capillary 103.
- the test sample solution introduced into the capillary 103 is discharged from one end of the capillary 103.
- the voltage applied to the sprayer 104 is more preferably in the range of about 4-6 kV, more preferably in the range of about 4-5 kV.
- the low-temperature bath 106 is provided for cooling the test sample solution in the reaction vessel 101 as described above.
- liquid nitrogen can be used to cool the test sample solution, and the test sample solution can be cooled by immersing the reaction vessel 101 in liquid nitrogen.
- the temperature of the test sample solution is controlled by other temperature control means other than liquid nitrogen. Is also good.
- the low-temperature bath 106 is not limited to a refrigerant such as liquid nitrogen. It is also possible to use a metal provided with a structure capable of holding the reaction vessel 101 in close contact. That is, by controlling this metal to a low temperature by a temperature control means such as an electronic device, the above-mentioned reaction vessel 101 is installed in close contact with this metal, and the temperature of the test sample solution in the reaction vessel 101 is made low. It is also possible to adopt a configuration that keeps it.
- the metal is preferably one having relatively high thermal conductivity, such as copper or aluminum.
- the sheath tube 107 is formed coaxially with the outside of the capillary 103, and the nebulizing gas supplied from a nebulizing gas supply source (not shown) is supplied to the sheath tube 107.
- the sample is discharged coaxially with the test sample discharged from the capillary 103.
- the discharge of the nebulizing gas assists the effective introduction of the atomized test sample discharged from the capillary 103 when a high voltage is applied to the ion extraction electrode.
- the nebulizing gas is preferably used at a normal temperature.
- dew condensation on the outer circumference of the sheath tube which is a problem in the conventional electrospray ionization mass spectrometer, does not occur, so that when a high voltage is applied to the sprayer 104, the leakage through the above dew condensation (electric shock) There is no danger of doing it.
- the cooling gas introduction pipe 108 is provided to cool the sprayer 104 to which a high voltage is applied, and to suppress a temperature rise of the test sample solution discharged from the capillary 103. The details will be described below.
- the cooling gas introduction pipe 108 is supported by support means (not shown). Specifically, in the drawing, the high voltage application section of the sprayer 104, that is, the position from the point at which the test sample of the capillary 103 starts to be heated by the application of the high voltage until the test sample is discharged from the capillary 103 The low-temperature inert gas discharged from the cooling gas introduction pipe 108 is supported by the supporting means so as to be directed to the portion indicated by the hatched portion.
- the discharge direction of the low-temperature inert gas is inclined by 30 ° to 60 ° with respect to the discharge direction of the nebulizing gas and the test sample solution. Is more preferable.
- the reason for the above range is that if the angle is less than 30 ° to the discharge direction of the nebulizing gas, the low-temperature inert gas cannot effectively cool the sprayer, and Above 60 °, This is because the discharge of the low-temperature inert gas impedes the discharge direction of the nebulizing gas.
- the discharge direction of the low-temperature inert gas within the range of 30 ° to 60 ° with respect to the discharge direction of the nebulizing gas and the test sample solution, the discharge of the nebulizing gas and the test sample can be prevented. It is possible to cool the sprayer effectively.
- the discharge flow rate per unit area at the discharge port of the low-temperature inert gas is preferably not more than the discharge flow rate per unit area at the discharge port of the nebulizing gas discharged from the sheath tube 107. Since the nebulizing gas is used to assist the effective introduction of the atomized test sample discharged from the cavity into the ion extraction electrode as described above, the discharge port of the low-temperature inert gas is used. This is because the discharge flow rate per unit area in must be such that the discharge rate per unit area at the nebulizing gas outlet and the discharge direction are not affected. Therefore, at the discharge outlet, for example, a low-temperature inert gas of 500 mL / (min X cm 2 ) can be used.
- the cooling gas introduction pipe 108 satisfying these two conditions, the low-temperature inert gas discharged from the cooling gas introduction pipe 108 can be used as the nebulizing gas discharged from the sheath pipe 107. Further, the sprayer 104 can be cooled without preventing the test sample solution discharged from the capillary 103 from being discharged.
- the cooling gas introduction pipe 108 is, for example, a force S at which a Teflon (registered trademark) tube having an inner diameter of 0.6 mm can be used, and the present embodiment is not limited to this.
- the electrospray ionization mass spectrometer 120 in the present embodiment is different from the electrospray ionization mass spectrometers described in Patent Documents 1 and 2, and the cooling gas introduction pipe 108 is not provided.
- the cooling gas introduction pipe 108 is not provided.
- the leakage (electric shock) due to the dew condensation of the sprayer 104 which is a problem raised in the electrospray ionization mass spectrometers described in Patent Documents 1 and 2, is described in the electrospray ionization mass spectrometry.
- the above electrospray The ionization mass spectrometer 120 can sufficiently cool the sprayer 104 even when analyzing a sample that is stable only at a temperature such as an extremely low temperature, and at the same time, accompanying the ionization of the test sample solution. Since it is possible to suppress the temperature rise, safe and accurate analysis becomes possible.
- test sample solution is previously cooled in the low-temperature bath 106, and heat generation of the test sample due to ion vaporization can be minimized. This makes it possible to suppress the destruction of the molecular structure of the sample ions caused by heating due to ion vaporization, even for a sample that is stable only at a very low temperature.
- the cooling gas introduction pipe 108 is configured so that the temperature can be adjusted by the same temperature adjusting means as the low-temperature bath 106 described above. This makes it possible to perform cooling based on the temperature characteristics of the test sample, that is, the temperature at which the structure of the test sample is most stable. Therefore, since the temperature can be adjusted to different test sample conditions, destruction of the molecular structure due to ion vaporization can be suppressed, and accurate analysis can be performed.
- the ion extraction electrode 109 guides the charged test sample discharged from the sprayer 104 to the ion extraction electrode 109.
- the charged test sample ions induced and passing through the ion extraction electrode 109 are analyzed by a mass spectrometer (not shown).
- the operator can adjust the tip of the sprayer 104 to an optimum position by using a position adjustment knob (not shown) while watching the analysis spectrum of the test sample, and can obtain an optimum analysis spectrum. .
- a test sample solution is prepared by adding a solvent to the test sample, and the test sample solution is placed in the reaction vessel 101, and the temperature is adjusted. It is placed in a warm bath 106 and cooled (first cooling step). In the first cooling step, the test sample solution is stirred by the magnetic stirrer controlled by the magnetic stirrer controller 105.
- the sprayer 104 is cooled beforehand by a low-temperature inert gas adjusted to 45 ° C. before the test sample solution is introduced, which is supplied through the cooling gas introduction pipe 108.
- the inert gas is discharged into the reaction vessel 101, and the test sample solution is supplied to the capillary. Introduced to sprayer 104 via 103.
- the test sample solution introduced into the sprayer 104 is applied with a high voltage while being cooled by the cooling gas introduction pipe 108 (second cooling step).
- the test sample solution to which the high voltage is applied is discharged from the tip of the capillary 3 by an electrostatic spray phenomenon.
- the charged atomized particle test sample discharged from the tip of the capillary 103 is then evaporated and the solvent is lost due to the dried gas, which is a cooled nitrogen gas, and the particle size is reduced. It is considered that the charged test sample ions that have been made smaller and the solvent force are released eventually move away from the particles.
- Charged test sample ions separated from the particles are introduced into a mass spectrometer (not shown) through the ion extraction electrode 109, and mass analysis is performed (mass analysis step).
- the mass spectrometer is not particularly limited as long as a conventionally known mass spectrometer used for general electrospray ionization mass spectrometry is used.
- the present invention may also be configured such that the analyzer 1 described in the above-described first embodiment is provided with the cooling gas introduction pipe of the present embodiment. That is, as shown in FIG. 10, the analyzer of the present invention includes a low-temperature bath 106 and a cooling gas inlet tube 108, and can also be used as an analyzer 10 ′ including an absorption 'light emission / scattering spectrum analyzer 30'. Good.
- the temperature using the low-temperature bath 106 and the cooling gas introduction tube 108 for example, in the case of a test sample in which the reaction rate is slowed by the temperature of the test sample, the measurement of the reaction intermediate is excellent. Can be implemented.
- the configuration of the analyzer 10 ′ enables Even when a stable test sample is used, mass spectrum analysis and absorption / emission / scattering spectrum analysis can be performed almost simultaneously.
- the iron (II) complex was artificially synthesized as an active center model complex of lipoxygenase, an enzyme that adds two oxygens to a substrate (Seiji, ugo; Ryo, Hyundaira; Mark, Roach; lomoyoshi). Michihko, Aki; akashi, Ogura; Teizo, Kitagawa; Hideki, Masuda; Shunichi, Fukuzumi; Yoshihito, Watanabe. Inorg. Chem.
- FIG. 3 shows a chemical reaction formula between the iron (III) complex and the 13-HPOD in the present example.
- the iron (III) complex was mixed with a completely degassed and dehydrated acetonitrile in an inert gas atmosphere in a reaction vessel 1 shown in Fig. 1 to prepare an acetonitrile solution of the iron (III) complex. Adjusted (3 mL, 500 ⁇ ). The obtained solution was maintained at a temperature of 40 ° C. to 50 ° C. by the thermostat 6 and stirred by a magnetic stirrer controlled by a magnetic stirrer controller 5.
- FIGS. Fig. 4 shows the measurement results of the electrospray mass.
- Fig. 4 (a) shows the electrospray mass spectrum at the start of the reaction (0 sec)
- Fig. 4 (b) shows the electrospray mass spectrum at 7 sec after the start of the reaction
- Fig. 4 (c) shows the mass spectrum of the spray from an elector opening 12 minutes after the start of the reaction.
- FIG. 4 (a) and (c) show a total analysis diagram in which the ionic strength of the maximum spectrum obtained at each reaction time is plotted against time.
- FIG. 5 shows the measurement results of the visible-ultraviolet absorption spectrum.
- Figure 5 shows the visible-ultraviolet absorption spectrum at the start of the measurement (0 seconds) ((A) in the figure) and 7 seconds later ((B) in the figure). The visible-ultraviolet absorption spectrum after (B in the figure) and after 12 minutes ((C) in the figure) are shown.
- FIG. 6 is a chemical reaction formula showing the reaction of the iron (III) complex with 13-HPOD and Et3N.
- the mass spectrum of the test sample and the absorption / emission / scattering are also included.
- the present invention includes the use of an electrospray mass spectrometer for the measurement of the mass spectrum.
- a method and an apparatus that can measure almost simultaneously in real time include a mass spectrum, an absorption spectrum, and an emission spectrum that can be measured only by simultaneous measurement of two spectra such as a mass spectrum and an absorption spectrum and a mass spectrum and an emission spectrum.
- the present invention also includes a method and a device for simultaneously measuring three or more spectrums.
- test sample analysis method it is possible to measure a spectrum of a test sample adjusted to a high concentration necessary for measurement of an absorption 'emission' scattering spectrum, and at the same time, to introduce a sample having a high concentration.
- the present invention includes the method of sending the above-mentioned test sample to an electrospray mass spectrometer equipped with an ionization chamber improved by using an inert gas pressure, and measuring the mass scale of the test sample.
- the ionization chamber which has been improved so that a high-concentration sample can be introduced as described above, is located in front of the ion extraction electrode (orifice), which is the inlet of the charged ions to the mass spectrometer.
- the present invention also includes an ionization chamber in which a mesh-like plastic ion introduction amount control plate is installed.
- the present invention also includes that the position of the mesh-like plastic ion introduction amount control plate can be moved back and forth, right and left, and up and down.
- the mass spectrometry of a manganese complex at a low temperature was measured using an electrospray ionization mass spectrometer 120 shown in FIG. The details will be described below.
- FIG. 8 shows a chemical structural formula of the manganese (IV) peroxo complex used in the present example.
- a method for mass spectrometry of the manganese (IV) peroxo complex will be described.
- a manganese (IV) methoxy complex was completely degassed and dehydrated, and a 3% manganese (IV) methoxy complex solution in methanol-dichloromethane (5 mL, 100 ⁇ M) was prepared using dichloromethane and methanol. 3% methanolic manganese (IV) methoxy complex
- the tan solution was placed in the above-mentioned reaction vessel 101 shown in FIG. 7, kept at 145 ° C. by the above-mentioned low-temperature bath 106, and stirred by a magnetic stirrer controlled by a magnetic stirrer controller 105.
- the sprayer 104 was cooled with nitrogen gas adjusted to 145 ° C supplied through the cooling gas introduction pipe 108.
- the pressure of the argon gas connected to one end of the inert gas introduction pipe 102 the flow rate of the 3% methanol-dichloromethane solution of the manganese (IV) methoxy complex, which is the test sample, passing through the capillary 103 was reduced to about It was adjusted to 3 ⁇ L / min, and the analysis of the mass scale of the test sample was started.
- FIG. 9C is a spectrum analysis diagram in which the ionic strength of the manganese (IV) peroxo complex having a mass number of 716 is plotted against time.
- FIG. 9 (c) when the test sample was brought to room temperature, the spectrum of the manganese (IV) peroxo complex was not immediately obtained, indicating that the manganese (IV) peroxo complex was decomposed. That is, it was found that the manganese (IV) peroxo complex cannot be detected by measurement at room temperature.
- the electrospray ionization mass spectrometer of the present invention and the electrospray ionization mass spectrometer of the present invention are required to detect the electrospray mass spectrum.
- the method turned out to be very effective.
- the present invention is not limited to the above embodiments, and various modifications can be made within the scope set forth in the claims.
- a test sample kept at a low temperature is sent to a sprayer using an inert gas pressure, and at the same time, the sprayer is directly cooled with an inert gas.
- It also includes low-temperature mass spectrometry, which performs ionization while analyzing the mass of a thermally unstable test sample, and its apparatus.
- the present invention also includes a low-temperature mass spectrometry method and a low-temperature mass spectrometry method in which a cooling gas introduction pipe for cooling a sprayer and a sprayer to which a high voltage is applied have completely independent structures.
- the analysis apparatus and analysis method of the present invention are greatly expected to be used for the analysis of biological macromolecules such as proteins and nucleic acids, and test samples such as chemical reaction solutions that change with IJI. It is possible to easily analyze and grasp the structure of the reaction intermediate and the like. In addition, its use is greatly expected for mass spectrometry of samples such as complexes that are stable only at low temperatures such as extremely low temperatures, which is not limited to use in the field of biopolymers such as proteins and nucleic acids.
- the use of the analysis apparatus and the analysis method of the present invention is very useful in observing a highly unstable chemical species such as an intermediate of a chemical reaction. Analysis is expected to be used for the development of new drugs and the development of chemical reaction catalysts.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2006510435A JPWO2005083416A1 (ja) | 2004-02-27 | 2005-02-23 | 質量スペクトルと略同時に吸収・発光・散乱スペクトルを分析する分析装置および分析方法、並びに、エレクトロスプレーイオン化法を用いた質量分析装置および分析方法 |
US10/590,939 US20070290129A1 (en) | 2004-02-27 | 2005-02-23 | Apparatus and Method for Absorption, Emission, and Scattering Spectroscoy With Substantially Simultaneous Mass Spectrometry, and Apparatus and Method for Mass Spectrometry Based on Electrospray Ionization |
EP05719442A EP1724574A4 (en) | 2004-02-27 | 2005-02-23 | ANALYSIS METHOD AND ANALYSIS METHOD FOR THE ESSENTIALLY SIMULTANEOUS ANALYSIS OF ABSORPTION / EMISSIONS / SPREADING SPECTRUM AND MASS SPECTRUM, AND ANALYSIS PROCESS AND MASS SPECTROSCOPE THAT USES ELECTROSPRAYIONISATION TECHNOLOGY |
CA002556558A CA2556558A1 (en) | 2004-02-27 | 2005-02-23 | Analytical method and analyzer capable of substantially simultaneously analyzing absorption/emission/scattering spectrum and mass spectrum, and analytical method and mass spectroscope utilizing electrospray ionization technique |
Applications Claiming Priority (2)
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JP2004-054148 | 2004-02-27 | ||
JP2004054148 | 2004-02-27 |
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WO2005083416A1 true WO2005083416A1 (ja) | 2005-09-09 |
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PCT/JP2005/002934 WO2005083416A1 (ja) | 2004-02-27 | 2005-02-23 | 質量スペクトルと略同時に吸収・発光・散乱スペクトルを分析する分析装置および分析方法、並びに、エレクトロスプレーイオン化法を用いた質量分析装置および分析方法 |
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US (1) | US20070290129A1 (ja) |
EP (1) | EP1724574A4 (ja) |
JP (1) | JPWO2005083416A1 (ja) |
CA (1) | CA2556558A1 (ja) |
WO (1) | WO2005083416A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009087594A (ja) * | 2007-09-28 | 2009-04-23 | National Institute Of Advanced Industrial & Technology | イオンビーム発生装置 |
JP2012516991A (ja) * | 2009-02-19 | 2012-07-26 | パナソニック株式会社 | 化学物質濃縮方法 |
KR101850304B1 (ko) * | 2015-02-09 | 2018-04-19 | 도레이 리서치 센터 인코포레이티드 | 분석방법 및 그것을 구비하는 분석장치 |
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TWI469180B (zh) * | 2012-08-16 | 2015-01-11 | Univ Nat Sun Yat Sen | 液態氮輔助電灑法質譜分析裝置及方法 |
CN102928498A (zh) * | 2012-11-06 | 2013-02-13 | 东华理工大学 | 组织样品内部电喷雾萃取电离质谱分析方法 |
CN103084127A (zh) * | 2013-01-22 | 2013-05-08 | 中国科学院大连化学物理研究所 | 一种适合质谱分析的高温常压催化反应炉及应用 |
CN103115956A (zh) * | 2013-01-22 | 2013-05-22 | 中国科学院大连化学物理研究所 | 一种适合质谱分析的低压高温热解炉及其应用 |
JP5973969B2 (ja) * | 2013-07-31 | 2016-08-23 | 国立大学法人徳島大学 | インライン型濃度計及び濃度検出方法 |
US11266383B2 (en) | 2015-09-22 | 2022-03-08 | University Health Network | System and method for optimized mass spectrometry analysis |
WO2017214718A2 (en) * | 2016-06-10 | 2017-12-21 | University Health Network | Soft ionization system and method of use thereof |
CN108625962A (zh) * | 2018-06-14 | 2018-10-09 | 河南科技大学 | 喷雾特性分析装置 |
CN112816436B (zh) * | 2019-11-15 | 2022-05-17 | 武汉米字能源科技有限公司 | 一种光谱-质谱联用装置及检测方法 |
CN111505103A (zh) * | 2020-04-29 | 2020-08-07 | 哈尔滨工业大学(威海) | 气溶胶气-液界面短存活中间体检测装置及方法与应用 |
CN112599404B (zh) * | 2020-12-10 | 2022-10-18 | 中国科学院深圳先进技术研究院 | 一种用于质谱成像的低温解吸电喷雾电离装置及方法 |
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Also Published As
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CA2556558A1 (en) | 2005-09-09 |
EP1724574A4 (en) | 2008-07-02 |
JPWO2005083416A1 (ja) | 2007-08-02 |
EP1724574A1 (en) | 2006-11-22 |
US20070290129A1 (en) | 2007-12-20 |
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