WO2015118681A1 - 質量分析装置及び質量分析方法 - Google Patents
質量分析装置及び質量分析方法 Download PDFInfo
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- H—ELECTRICITY
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N30/02—Column chromatography
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H01J49/10—Ion sources; Ion guns
- H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
- H01J49/168—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission field ionisation, e.g. corona discharge
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- H—ELECTRICITY
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Definitions
- the present invention relates to a mass spectrometer and a mass spectrometry method for performing mass spectrometry by ionizing components in a liquid sample using an electrospray ionization (ESI) source and an atmospheric pressure chemical ionization (APCI) source in combination.
- ESI electrospray ionization
- APCI atmospheric pressure chemical ionization
- LC liquid chromatograph unit
- MS mass analyzer
- ionization source of the mass spectrometer an electrospray ionization (ESI) source or an atmospheric pressure chemical ionization (APCI) source is used as the ionization source of the mass spectrometer.
- ESI electrospray ionization
- APCI atmospheric pressure chemical ionization
- the dual ionization source includes an ESI probe into which a liquid sample is introduced, an ESI power source that supplies a high voltage (ESI voltage) to the ESI probe, and a high voltage that is positioned near the outlet of the ESI probe to cause corona discharge. And a APCI power source for supplying a high voltage (APCI voltage) to the needle.
- ESI voltage high voltage
- APCI voltage high voltage
- the liquid sample and the mobile phase separated into components in the liquid chromatograph and introduced into the ESI probe are discharged as droplets charged by the ESI voltage applied to the ESI probe, and the high polarity of the components contained in the sample is released.
- the component is ionized.
- low-polarity components contained in the sample are not ionized at this stage, but are ionized by exchanging charges with the mobile phase ionized by corona discharge in the corona needle.
- the dual ionization source is used with the ESI voltage and APCI voltage set to an average value.
- the ionization efficiency is low when an average ESI voltage or APCI voltage is applied, and it may not be possible to generate a detectable amount of ions with sufficient intensity to quantify the component. There was a problem.
- the problem to be solved by the present invention is to generate a quantity of ions that can be detected with sufficient intensity for each component, regardless of the polarity of the components contained in the sample, and obtain a mass analysis result with high sensitivity and high accuracy. It is to provide a mass spectrometry apparatus and method capable of
- a mass spectrometer made to solve the above problems is as follows. a) an ESI probe into which a liquid sample containing one or more components is introduced; a corona needle disposed near the outlet of the ESI probe; an ESI voltage supply unit for supplying an ESI voltage to the ESI probe; An ionization source having an APCI voltage supply for supplying an APCI voltage to the corona needle; b) an ionization condition storage unit configured to store a plurality of ionization conditions for the liquid sample, which are set by an analyst, and have different values of the ESI voltage and / or the APCI voltage; c) a mass spectrometry execution unit that performs mass analysis of ions generated from the liquid sample using each of the plurality of ionization conditions; d) Mass for selecting a mass analysis result in which ions are detected at an intensity suitable for analysis for each of the one or more components from among the results of mass analysis obtained for each of the plurality of ion
- the above-mentioned “mass analysis result in which ions are detected with an intensity suitable for analysis” is typically a mass analysis result with the maximum detection intensity of ions, but is not necessarily limited thereto.
- the mass analysis result selection unit selects a mass analysis result having a maximum ratio of the detection intensity of the ion to the noise intensity (S / N ratio), or the detection intensity of the ion is within the dynamic range of the detector. It can also be configured to select the one having the maximum ion detection intensity except for the mass analysis result exceeding the maximum value.
- ions having a strength suitable for analysis are obtained from the results obtained by performing mass analysis by ionizing a liquid sample under a plurality of ion conditions having different values of ESI voltage or / APCI voltage.
- the detected mass analysis result is selected. Therefore, even when a sample includes a plurality of components having different polarities, it is possible to generate a detectable amount of ions with sufficient intensity for each component and obtain a highly accurate mass analysis result.
- the mass spectrometer according to the present invention can be suitably used in LC / MS.
- LC / MS the time during which the separated components are eluted in the LC column is limited, and the amount of elution changes during that time.
- the mass spectrometry execution unit perform mass spectrometry by repeatedly using the plurality of ionization conditions.
- the mass spectrometer according to the present invention can be used to perform preliminary measurement for determining ionization conditions in mass spectrometry for qualitatively or quantifying components contained in a liquid sample. Qualitative and quantitative determination of the components in the sample is performed by, for example, a selected ion monitoring (SIM) method or a multiple reaction monitoring (MRM) method. Therefore, the mass spectrometer according to the present invention further includes: e) Each of the one or more components may include an ionization condition determining unit that determines an ionization condition corresponding to the selected mass analysis result as an optimum ionization condition.
- SIM selected ion monitoring
- MRM multiple reaction monitoring
- the mass spectrometry method according to the present invention ionizes a liquid sample by applying an ESI voltage to an ESI probe into which a liquid sample containing one or more components is introduced.
- a mass spectrometer having an ionization source having an ESI source and an APCI source that ionizes the liquid sample discharged from the ESI probe by applying an APCI voltage to a corona needle disposed near the outlet of the ESI probe
- a method for mass spectrometry of ions produced by the ionization source comprising: a) Have an analyst set a plurality of ionization conditions for differentiating the ESI voltage value and / or the APCI voltage value for ionizing the liquid sample, b) mass-analyzing ions generated from the sample under each of the plurality of ionization conditions; c) selecting a mass analysis result in which ions are detected at an intensity suitable for analysis for each of the one or more components from among
- mass spectrometer and the mass spectrometry method according to the present invention By using the mass spectrometer and the mass spectrometry method according to the present invention, regardless of the polarity of the component contained in the sample, the amount of ions that can be detected with sufficient intensity is generated for each component, and the sensitivity and accuracy are high. Mass spectrometry results can be obtained.
- FIG. 3 is a flowchart for explaining a mass spectrometry method according to the first embodiment.
- FIG. FIG. 3 is a diagram for explaining a mass spectrum created in the first embodiment.
- 10 is a flowchart for explaining a mass spectrometry method according to the second embodiment. The figure explaining the mass chromatogram acquired by the MRM measurement using the mass spectrometry method of Example 2.
- FIG. The figure explaining the flow of the analysis in the mass spectrometry method of Example 3.
- the mass spectrometer of the present embodiment is configured in combination with the liquid chromatograph unit 1 and operates as a liquid chromatograph mass spectrometer.
- the liquid chromatograph unit 1 includes a mobile phase container 10 in which a mobile phase is stored, a pump 11 that sucks the mobile phase and delivers it at a constant flow rate, and a mobile phase.
- a mobile phase container 10 in which a mobile phase is stored
- a pump 11 that sucks the mobile phase and delivers it at a constant flow rate
- a mobile phase are provided with an injector 12 for injecting a predetermined amount of sample prepared in advance, and a column 13 for separating various compounds contained in the sample in the time direction.
- the pump 11 sucks the mobile phase from the mobile phase container 10 and delivers it at a constant flow rate.
- a predetermined amount of the liquid sample is introduced from the injector 12 and is introduced into the column 13 along the flow of the mobile phase.
- Each component in the liquid sample is temporally separated in the column 13 and introduced into the mass spectrometer 2 together with the mobile phase. Note that when the liquid sample is subjected to flow injection analysis, the column 13 is not used, and the liquid sample introduced from the injector 12 is directly introduced into the mass spectrometer 2.
- the mass analyzer 2 includes a first and a second vacuum whose degree of vacuum is increased stepwise between an ionization chamber 20 that is substantially atmospheric pressure and a high-vacuum analysis chamber 23 that is evacuated by a vacuum pump (not shown). 2
- a multi-stage differential exhaust system having intermediate vacuum chambers 21 and 22 is provided.
- the ionization source of the mass spectrometer of the present embodiment includes both a probe (ESI probe) 201 for electrospray ionization (ESI) of a liquid sample and a probe (corona probe) for atmospheric pressure chemical ionization (APCI) in the ionization chamber 20.
- ESI probe electrospray ionization
- APCI atmospheric pressure chemical ionization
- the ionization chamber 20 and the first intermediate vacuum chamber 21 at the subsequent stage communicate with each other through a small heating capillary 203.
- the first intermediate vacuum chamber 21 and the second intermediate vacuum chamber 22 are separated by a skimmer 212 having a small hole at the top, and ions are focused in the first intermediate vacuum chamber 21 and the second intermediate vacuum chamber 22, respectively.
- ion guides 211 and 221 for transporting to the subsequent stage are installed.
- the analysis chamber 23 sandwiches a collision cell 232 in which a multipole ion guide (q2) 233 is installed, and the former quadrupole mass filter (Q1) 231 that separates ions according to the mass-to-charge ratio, A post-stage quadrupole mass filter (Q3) 234 for separating the gas in accordance with the mass-to-charge ratio, and an ion detector 235 are installed.
- a collision cell 232 in which a multipole ion guide (q2) 233 is installed, and the former quadrupole mass filter (Q1) 231 that separates ions according to the mass-to-charge ratio, A post-stage quadrupole mass filter (Q3) 234 for separating the gas in accordance with the mass-to-charge ratio, and an ion detector 235 are installed.
- the power supply unit 24 applies predetermined voltages to the ESI probe 201, the corona needle 202, the ion guides 211, 221, 233, the quadrupole mass filters 231, 234, and the like.
- Each of the quadrupole mass filters 231 and 234 has a pre-rod electrode for correcting the disturbance of the electric field at the inlet end in front of the main rod electrode.
- the pre-rod electrode is different from the main rod electrode. A voltage can be applied.
- the liquid sample and the mobile phase that have reached the ESI probe 201 to which a high voltage (ESI voltage) is applied from the power supply unit 24 become droplets (charged droplets) to which an electric charge has been applied. Sprayed from the tip.
- the charged droplets are micronized while being disrupted by the action of electrostatic force due to the applied charge, and highly polar components in the liquid sample are ionized.
- low-polarity components contained in the sample are not ionized at this stage, and exchange electric charges with the mobile phase ionized by corona discharge in the corona needle 202 generated by application of a high voltage (APCI voltage). Ionized.
- the ions thus generated are sent to the first intermediate vacuum chamber 21 through the capillary 203, converged by the ion guide 211, and then sent to the second intermediate vacuum chamber 22 through a small hole at the top of the skimmer 212. Then, it is converged again by the ion guide 221 in the second intermediate vacuum chamber 22, sent to the analysis chamber 23, and introduced into the space in the long axis direction of the front quadrupole mass filter 231.
- both MS analysis and MS / MS analysis can be performed.
- MS analysis ions having a specific mass-to-charge ratio are allowed to pass through one of the front-stage quadrupole mass filter 231 and the rear-stage quadrupole mass filter 234, and the ions of all mass-to-charge ratios are allowed to pass through the other.
- a predetermined voltage (a voltage in which a high-frequency voltage and a DC voltage are superimposed) is applied from the power supply unit 24.
- the ions that have passed through the subsequent quadrupole mass filter 234 are detected by the ion detector 235.
- the ion detector 235 is, for example, a pulse count type detector, and outputs a number of pulse signals corresponding to the number of incident ions to the data processing unit 4 as detection signals.
- a predetermined voltage (high frequency) is supplied from the power supply unit 24 so that ions having a specific mass-to-charge ratio pass through both the front quadrupole mass filter 231 and the rear quadrupole mass filter 234.
- a voltage in which a voltage and a DC voltage are superimposed) is applied.
- CID gas is supplied into the collision cell 232 continuously or intermittently.
- the precursor ions collide with the CID gas and dissociate, and various product ions are generated.
- These product ions are introduced into a subsequent quadrupole mass filter 234, and only product ions having a specific mass-to-charge ratio corresponding to the voltage applied to each rod electrode pass through the filter 234 to detect an ion detector. 235 is detected.
- the data processing unit 4 includes a storage unit 41, and includes an ionization condition setting unit 42, a mass analysis execution unit 43, a mass analysis result selection unit 44, an ionization condition determination unit 45, and a mass analysis result display unit 46 as functional blocks. I have.
- the data processing unit 4 is connected to a control unit 5 that controls operations of the pump 11 and the injector 12 of the liquid chromatograph unit 1, the power supply unit 24 of the mass analysis unit 2, a CID gas supply unit (not shown), and the like. And is configured to transmit and receive signals appropriately.
- the entity of the data processing unit 4 is a personal computer, and the function as the data processing unit 4 can be exhibited by executing data processing software installed in the computer in advance. Furthermore, an input unit 6 and a display unit 7 are connected to the data processing unit 4.
- This embodiment is an example of a mass spectrometry method in which a liquid sample containing component A, component B, and component C is introduced by flow injection without using the column 13 in the liquid chromatograph unit 1 and MS scan analysis is performed in the mass analyzer 2 It is.
- the component A, the component B, and the component C in the present embodiment are a high polarity component, a low polarity component, and a medium polarity component, respectively.
- the ionization condition setting unit 42 displays a setting screen for the mass analysis condition of the liquid sample on the display unit 7 (step S11), and prompts the analyst to set.
- the mass analysis condition items set by the analyst include mass analysis mode (Q1scan, Q3scan, SIM, MRM, etc.), mass-to-charge ratio range, scan speed (for scan measurement), and liquid sample ionization conditions ( ESI voltage and APCI voltage value) are included, and the analyst is allowed to set a plurality of ionization conditions with different ESI voltage and / or APCI voltage values.
- the ionization condition setting unit 42 stores the set mass analysis conditions in the storage unit 41 (step S12).
- three types of mass analysis conditions of events 1 to 3 having different APCI voltages are set.
- the magnitude of the APCI voltage applied to ionize the liquid sample is different.
- Different ionization conditions are set for the relative relationship between the ESI voltage and the APCI voltage so that a high polarity component suitable for ESI is efficiently generated in event 1 and a low polarity component suitable for APCI is efficiently generated in event 3.
- Event 2 is set as an intermediate ionization condition between event 1 and event 3.
- the mass analysis execution unit 43 executes mass analysis according to the set and stored conditions. Specifically, mass analysis is repeated with events 1 to 3 as a set (FIG. 4, step S13), and the total ion chromatogram (TIC) and mass chromatogram acquired for each event are acquired (step S13). S14).
- the mass analysis result display unit 46 displays these TIC and mass chromatogram on the display unit 7.
- TIC obtained by the above measurement is shown in FIG. 5, and mass spectra are shown in FIGS. 6 (a) to 6 (c), respectively.
- the high-polarity component A is detected at event 1
- the low-polarity component B is detected at event 3
- the medium-polarity component C is detected at event 2 with the highest intensity.
- the detected intensity of ions reflects the amount of ions generated. That is, the condition of event 1 is optimal for the ionization of the highly polar component A, the condition of event 3 is optimal for the ionization of the low polarity component B, and the event 2 is suitable for the ionization of the medium polarity component C. It can be seen that the conditions are optimal.
- the mass analysis result selection unit 44 compares the detection intensity of ions in each event 1 to 3 for each component, extracts the one with the highest detection intensity, and reconstructs the mass spectrum (FIG. 6 (d )), The mass spectrum reconstructed on the mass analysis result display unit 46 is displayed on the display unit 7. In this way, a quantity of ions that can be detected with sufficient intensity for each of a plurality of components having different polarities contained in the sample can be generated, and a highly sensitive and accurate mass analysis result can be obtained.
- MRM method In the mass spectrometry method of Example 2, conditions (MRM method) for analyzing an unknown liquid sample for multiple reaction monitoring (MRM: Multiple Reaction Monitoring) are optimized.
- MRM method an analysis condition (MRM method) for performing an MRM analysis using a high-polarity component A, a low-polarity component B, and a medium-polarity component C for an unknown liquid sample is optimized. A method will be described.
- an ion having a specific mass-to-charge ratio is selectively passed as a precursor ion in the preceding quadrupole mass filter 231, and the precursor ion is allowed to collide with the CID gas in the collision cell 232.
- product ions having a specific mass-to-charge ratio are selectively passed through the subsequent-stage quadrupole mass filter 234 and detected by the ion detector 235.
- the mass-to-charge ratio of the precursor ion selected by the front-stage quadrupole mass filter 231 and the mass-to-charge ratio of the product ion selected by the rear-stage quadrupole mass filter 234 Must be determined in advance.
- a combination of a precursor ion and a product ion in MRM measurement is referred to as an MRM transition.
- the MRM analysis is mainly performed for the purpose of qualitative and quantitative determination of target components, and the higher the detection intensity of product ions, the higher the accuracy of the analysis. Accordingly, in addition to the MRM transition, the collision energy (CE: Collision Energy) given when the precursor ion and the CID gas collide with each other in the collision cell 232 is usually optimized so that the product ion generation efficiency is the highest. . In this embodiment, the ionization conditions are also optimized so that the ion generation efficiency in the ionization chamber 20 is the highest.
- CE Collision Energy
- the ionization condition setting unit 42 displays a setting screen of mass analysis conditions for determining the ionization conditions and precursor ions of the liquid sample on the display unit 7 (step S21), and prompts the analyst to set.
- the items of the mass analysis conditions to be set by the analyst are the same as those in the first embodiment.
- the ionization condition setting unit 42 stores the set mass analysis conditions in the storage unit 41 as analysis (event) conditions (step S22). In this embodiment, events 1 to 3 shown in FIG. 3 are used.
- mass analysis (Q1scan) is executed according to the set conditions (step S23), and the mass spectrum of the precursor ion is acquired for each event (step S24).
- the mass analysis result display unit 46 displays these mass spectra on the display unit 7.
- the mass spectrometry result selection part 44 compares the mass spectrum acquired about each event, and extracts the mass peak with the largest intensity
- the ionization condition determination unit 45 determines the ionization condition of the event in which the mass peak appears as the ionization condition of the component, and sets the ion corresponding to the mass peak as the precursor ion (step S26).
- the ionization conditions for event 1, event 2, and event 3 are determined as the ionization conditions for the high polarity component A, the low polarity component B, and the medium polarity component C, respectively.
- one mass peak having the highest intensity is extracted, but a plurality of mass peaks may be extracted in order of increasing intensity to set a plurality of precursor ions. For example, when MRM transition for quantification and MRM transition for confirmation are respectively used in MRM analysis, a plurality of precursor ions are set.
- the mass analysis execution unit 43 again performs a product ion scan measurement by setting a plurality of conditions with different CEs using the determined ionization conditions (step S27). That is, the precursor quadrupole mass filter 231 selectively passes the previously determined precursor ions, the precursor ions are cleaved in the collision cell 232 to generate product ions, and the ions that pass through the subsequent quadrupole mass filter 234.
- the product ion scan spectrum is obtained by continuously changing the mass-to-charge ratio.
- the mass spectrometry result display unit 46 displays the product ion display unit 7 acquired under a plurality of conditions with different CE values. Then, the mass analysis result selection unit 44 compares the plurality of product ion scan spectra obtained for each component, extracts the mass peak having the highest intensity (step S28), and obtains the product ion and CE value corresponding to the mass peak. Determine (step S29).
- An MRM method including the ionization conditions, MRM transitions (precursor ion mass-to-charge ratio and product ion mass-to-charge ratio), and CE value determined in this way is created and stored in the storage unit 41 (step S30).
- Example 3 describes an example in which an optimal mass chromatogram is acquired in MRM analysis using LC / MS.
- the target component in this example is a medium polarity component C.
- the MRM transition and CE value for the component C are predetermined with reference to a compound database or the like.
- the analyzer sets a plurality of MRM analysis conditions with different APCI voltages on the mass analysis setting screen displayed on the display unit 7 by the ionization condition setting unit 42 (events 11 to 15, FIG. 9). Then, the mass spectrometry execution unit 43 repeatedly executes events 11 to 15 to acquire a mass chromatogram for each event (FIG. 10). Subsequently, the mass spectrometry result selection unit 44 calculates the value of the S / N ratio of the mass chromatogram of each event, and extracts the mass chromatogram having the largest S / N ratio value. The value of the S / N ratio of the mass chromatogram can be obtained, for example, by calculating the ratio of the peak intensity in the chromatogram and the RMS value of the intensity of the region excluding the peak.
- the ionization condition (APCI voltage: 1 kV) at which the S / N ratio value is maximum may be different from the ionization condition (APCI voltage: 2 kV) at which the intensity is maximum.
- APCI voltage: 1 kV the ionization condition at which the S / N ratio value is maximum.
- APCI voltage: 2 kV the ionization condition at which the intensity is maximum.
- each of the above embodiments is merely an example, and can be appropriately changed in accordance with the gist of the present invention.
- a plurality of ionization conditions in which only the APCI voltage is different while the ESI voltage is constant are set.
- a plurality of ionization conditions in which both the ESI voltage and the APCI voltage are different from each other, or a plurality of ionization conditions in which only the ESI voltage is different Ionization conditions can also be set.
- a mass spectrometer having a tandem quadrupole configuration is taken as an example, but a time-of-flight mass spectrometer or the like is not limited to a quadrupole type.
- a time-of-flight mass spectrometer or the like is not limited to a quadrupole type.
- an example of measurement in MS or MS / MS has been described. However, it can be used in other measurement methods (SIM measurement or the like) or MS n analysis in a mass spectrometer equipped with an ion trap.
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Abstract
Description
a) 1乃至複数の成分を含有する液体試料が導入されるESIプローブと、前記ESIプローブの出口付近に配置されたコロナニードルと、前記ESIプローブにESI電圧を供給するESI電圧供給部と、前記コロナニードルにAPCI電圧を供給するAPCI電圧供給部と、を有するイオン化源と、
b) 分析者により設定された、前記液体試料に関する、前記ESI電圧の値又は/及び前記APCI電圧の値が異なる複数のイオン化条件を記憶するイオン化条件記憶部と、
c) 前記複数のイオン化条件のそれぞれを用いて前記液体試料から生成したイオンを質量分析する質量分析実行部と、
d) 前記複数のイオン化条件のそれぞれについて得られた質量分析の結果の中から、前記1乃至複数の成分のそれぞれについて、分析に適した強度でイオンが検出されている質量分析結果を選出する質量分析結果選出部と、
を備えることを特徴とする。
そこで、本発明に係る質量分析装置は、さらに、
e) 前記1乃至複数の成分のそれぞれについて、前記選出された質量分析結果に対応するイオン化条件を最適イオン化条件として決定するイオン化条件決定部
を備えた構成とすることができる。
a) 前記液体試料をイオン化するための、前記ESI電圧の値又は/及び前記APCI電圧の値が異なる複数のイオン化条件を分析者に設定させ、
b) 前記複数のイオン化条件のそれぞれにより試料から生成したイオンを質量分析し、
c) 前記複数のイオン化条件のそれぞれについて得た質量分析結果の中から、前記1乃至複数の成分のそれぞれについて、分析に適した強度でイオンが検出されている質量分析結果を選出する
ことを特徴とする。
MS分析では、前段四重極マスフィルタ231と後段四重極マスフィルタ234のいずれか一方において特定の質量電荷比を有するイオンを通過させ、他方では全ての質量電荷比のイオンを通過させるように、電源部24からそれぞれ所定の電圧(高周波電圧と直流電圧とが重畳された電圧)を印加する。そして、後段四重極マスフィルタ234を通過したイオンをイオン検出器235により検出する。イオン検出器235は例えばパルスカウント型検出器であり、入射したイオンの数に応じた個数のパルス信号を検出信号としてデータ処理部4へと出力する。
まず、イオン化条件設定部42は、液体試料のイオン化条件及びプリカーサイオンを決定するための質量分析条件の設定画面を表示部7に表示し(ステップS21)、分析者に設定を促す。分析者に設定させる質量分析条件の項目も実施例1と同様である。イオン化条件設定部42は、設定された質量分析条件を分析(イベント)の条件として記憶部41に保存する(ステップS22)。本実施例では、図3に示したイベント1~3を用いる。
各目的成分について、イオン化条件とプリカーサイオンを決定すると、再び質量分析実行部43が、決定したイオン化条件を用い、CEが異なる複数の条件を設定してプロダクトイオンスキャン測定を行う(ステップS27)。つまり、前段四重極マスフィルタ231では先に決定したプリカーサイオンを選択的に通過させ、コリジョンセル232においてプリカーサイオンを開裂させてプロダクトイオンを生成し、後段四重極マスフィルタ234を通過させるイオンの質量電荷比を連続的に変化させてプロダクトイオンスキャンスペクトルを取得する。質量分析結果表示部46は、CE値が異なる複数の条件でそれぞれ取得されたプロダクトイオン表示部7に表示する。そして、質量分析結果選出部44は、各成分についてそれぞれ得た複数のプロダクトイオンスキャンスペクトルを比較し、強度が最も大きいマスピークを抽出し(ステップS28)、該マスピークに対応するプロダクトイオンとCE値を決定する(ステップS29)。こうして決定したイオン化条件、MRMトランジション(プリカーサイオンの質量電荷比及びプロダクトイオンの質量電荷比)、及びCE値を含むMRMメソッドが作成され、記憶部41に保存される(ステップS30)。ところで、プロダクトイオンスキャン測定のスキャン速度が速い場合には、プロダクトイオンスキャン測定時の質量電荷比とMRM分析時の質量電荷比に質量ずれが生じることがある。この場合には、当該質量分析装置について予め作成されている校正テーブルに基づく質量補正を行った後に、MRMメソッドを作成することが望ましい。
10…移動相容器
11…ポンプ
12…インジェクタ
13…カラム
2…質量分析部
20…イオン化室
201…ESIプローブ
202…コロナニードル
203…加熱キャピラリ
21…第1中間真空室
211…イオンガイド
212…スキマー
22…第2中間真空室
221…イオンガイド
23…分析室
231…前段四重極マスフィルタ
232…コリジョンセル
233…イオンガイド
234…後段四重極マスフィルタ
235…イオン検出器
24…電源部
4…データ処理部
41…記憶部
42…イオン化条件設定部
43…質量分析実行部
44…質量分析結果選出部
45…イオン化条件決定部
46…質量分析結果表示部
5…制御部
6…入力部
7…表示部
Claims (7)
- a) 1乃至複数の成分を含有する液体試料が導入されるESIプローブと、前記ESIプローブの出口付近に配置されたコロナニードルと、前記ESIプローブにESI電圧を供給するESI電圧供給部と、前記コロナニードルにAPCI電圧を供給するAPCI電圧供給部と、を有するイオン化源と、
b) 分析者により設定された、前記液体試料に関する、前記ESI電圧の値又は/及び前記APCI電圧の値が異なる複数のイオン化条件を記憶するイオン化条件記憶部と、
c) 前記複数のイオン化条件のそれぞれを用いて前記液体試料から生成したイオンを質量分析する質量分析実行部と、
d) 前記複数のイオン化条件のそれぞれについて得られた質量分析の結果の中から、前記1乃至複数の成分のそれぞれについて、分析に適した強度でイオンが検出されている質量分析結果を選出する質量分析結果選出部と、
を備えることを特徴とする質量分析装置。 - 前記質量分析結果選出部が、イオンの検出強度が最大である質量分析結果を選出することを特徴とする請求項1に記載の質量分析装置。
- 前記質量分析結果選出部が、イオンの検出強度とノイズ強度の比が最大である質量分析結果を選出することを特徴とする請求項1に記載の質量分析装置。
- 前記質量分析実行部が、前記複数のイオン化条件を繰り返し用いて質量分析を行うことを特徴とする請求項1から3のいずれかに記載の質量分析装置。
- e) 前記1乃至複数の成分のそれぞれについて、前記選出された質量分析結果に対応するイオン化条件を最適イオン化条件として決定するイオン化条件決定部
を備えることを特徴とする請求項1から4のいずれかに記載の質量分析装置。 - f) 表示部と、
g) 前記質量分析結果選出部により選出された質量分析結果を前記表示部に表示する質量分析結果表示部と、
を備えることを特徴とする請求項1から5のいずれかに記載の質量分析装置。 - 1乃至複数の成分を含有する液体試料が導入されるESIプローブにESI電圧を印加して該液体試料をイオン化するESI源と、前記ESIプローブの出口付近に配置されたコロナニードルにAPCI電圧を印加して前記ESIプローブから放出される前記液体試料をイオン化するAPCI源とを有するイオン化源を備えた質量分析装置を用いて、該イオン化源で生成したイオンを質量分析する方法であって、
a) 前記液体試料をイオン化するための、前記ESI電圧の値又は/及び前記APCI電圧の値が異なる複数のイオン化条件を分析者に設定させ、
b) 前記複数のイオン化条件のそれぞれにより試料から生成したイオンを質量分析し、
c) 前記複数のイオン化条件のそれぞれについて得た質量分析結果の中から、前記1乃至複数の成分のそれぞれについて、分析に適した強度でイオンが検出されている質量分析結果を選出する
ことを特徴とする質量分析方法。
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CN111684273B (zh) * | 2018-02-09 | 2023-09-05 | 浜松光子学株式会社 | 试样支撑体、电离法以及质量分析方法 |
WO2019229963A1 (ja) * | 2018-05-31 | 2019-12-05 | 株式会社島津製作所 | 探針エレクトロスプレーイオン化質量分析装置 |
US20220208539A1 (en) * | 2019-04-29 | 2022-06-30 | Ohio State Innovation Foundation | Method and apparatus for mass spectrometry |
CN110289203B (zh) * | 2019-06-03 | 2021-03-09 | 清华大学深圳研究生院 | 一种电晕放电电离源结构及离子迁移谱仪 |
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