WO2015189949A1 - 質量分析用データ処理装置及び同装置用プログラム - Google Patents
質量分析用データ処理装置及び同装置用プログラム Download PDFInfo
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- WO2015189949A1 WO2015189949A1 PCT/JP2014/065580 JP2014065580W WO2015189949A1 WO 2015189949 A1 WO2015189949 A1 WO 2015189949A1 JP 2014065580 W JP2014065580 W JP 2014065580W WO 2015189949 A1 WO2015189949 A1 WO 2015189949A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0027—Methods for using particle spectrometers
- H01J49/0036—Step by step routines describing the handling of the data generated during a measurement
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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
- G01N30/86—Signal analysis
- G01N30/8658—Optimising operation parameters
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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
- G01N30/62—Detectors specially adapted therefor
- G01N30/72—Mass spectrometers
- G01N30/7233—Mass spectrometers interfaced to liquid or supercritical fluid chromatograph
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- the present invention relates to a data processing apparatus for processing data collected by a mass spectrometer and a computer program for the apparatus, and more particularly, data for quantifying a compound in a sample using mass spectrometry.
- the present invention relates to a processing apparatus and a program for the apparatus.
- a chromatograph mass spectrometer combined with a gas chromatograph (GC) or liquid chromatograph (LC) and a mass spectrometer, various components contained in a test sample are temporally separated through a column, and each separated component is separated. Ions generated from the components are separated by a quadrupole mass filter or the like according to the mass to charge ratio m / z and detected by a detector.
- GC gas chromatograph
- LC liquid chromatograph
- an ion characterizing the compound is determined as a target ion, and selected ion monitoring (SIM) measurement or multiple reaction monitoring for the target ion is performed. (MRM) measurement is performed with a mass spectrometer. Based on the data obtained by the actual measurement, an extracted ion chromatogram (mass chromatogram) for the target ion is prepared, and the area value and peak height of the chromatogram peak appearing near the retention time of the target compound in the chromatogram. From the above, the concentration of the target compound is calculated.
- the target ion may be referred to as a quantitative ion, and usually the ion corresponding to the peak showing the maximum signal intensity in the typical mass spectrum of the compound is selected.
- the target ion is an ion that characterizes the compound
- the actual sample may contain various impurities, and the separation conditions in the previous chromatograph are not appropriate, so the component separation is insufficient. Multiple compounds may overlap. In such a case, even if only the chromatogram peak of the target ion having a specific mass-to-charge ratio MT is seen, it is difficult to confirm whether or not the peak is indeed derived from the target compound. Therefore, in quantitative analysis using chromatographic mass spectrometry, in general, an ion having another mass-to-charge ratio Mc that characterizes the compound is selected as a confirmation ion, in addition to the target ion, and the confirmation ion on an actually measured mass spectrum is selected.
- confirmation ion ratio the intensity ratio between the peak signal intensity of the target and the peak signal intensity of the target ion (hereinafter referred to as “confirmed ion ratio”), confirmation that the target ion is truly derived from the target compound, that is, identification of the target ion (See Patent Document 1 and Non-Patent Document 1).
- confirmation ion ratio the intensity ratio between the peak signal intensity of the target and the peak signal intensity of the target ion
- FIG. 8 is a diagram showing a confirmation ion parameter setting screen for performing such automatic processing in a conventional chromatograph mass spectrometer
- FIG. 9 is a diagram showing a confirmation ion detail setting screen for each target ion.
- absolute tolerance is a mode in which the identification range for identifying that the target ion is derived from the target compound is defined by the absolute value of the confirmation ion ratio.
- the confirmation ion ratio is Ri [%] and the tolerance width is Rw [%.
- the confirmation ion ratio is Ri [%] and the tolerance width is Rw [%]
- the identification range is set by the above formula (1) or (2).
- FIG. 9 shows the identification range of five types of confirmation ions with the precursor ion m / z: 147.00 and the product ion m / z: 46.0 (m / z: 147.00> 46.0) as target ions by MRM measurement. It is a detailed setting screen of confirmation ion.
- the confirmation ion mode is absolute tolerance, the default tolerance is ⁇ 30 [%], for example, confirmation ion ratio is 60.00 precursor ion m / z: 130.00, product ion m / z: 90.0 confirmation
- the conventional chromatographic mass spectrometer has the following problems. That is, the measurer can arbitrarily select either absolute tolerance or relative tolerance as the confirmation ion mode, but depending on the purpose and application of the measurement, it may be necessary to combine absolute tolerance and relative tolerance. is there.
- the confirmation ion ratio at the time of absolute tolerance and the confirmation ion ratio at the time of relative tolerance are individually set, It is stipulated that the identification ranges are obtained using the individually set confirmation ion ratios, and the larger of the absolute allowable range and the relative allowable range is adopted as the identification range for target ion identification.
- the upper limit of the identification range is set to 100% (that is, when the signal intensity of the confirmation ion exceeds the signal intensity of the target ion, the identification is impossible).
- the recommended tolerance varies depending on the confirmation ions.
- the present invention has been made in view of the above problems, and the purpose of the present invention is to confirm whether or not the target ion is an appropriate ion derived from the target compound using the confirmed ion ratio. Even when the number of target compounds is large or the number of confirmation ions for one target ion is large, accurate judgments according to various standards can be made while reducing the burden on the operator.
- An object of the present invention is to provide a data processing apparatus for mass spectrometry and a program for the apparatus.
- the data processing apparatus for mass spectrometry according to the present invention which has been made to solve the above problems, has another mass-to-charge ratio for confirming the target compound in addition to a target ion having a specific mass-to-charge ratio that characterizes the target compound. And confirming the suitability of the target ion by using the result to determine the signal intensity between the target ion and the confirmation ion obtained by measurement on the target sample.
- a data processing apparatus for mass spectrometry for performing identification or quantification a) The signal intensity of the target ion and the signal intensity of the confirmation ion for determining that the peak presumed to be the target ion peak derived from the target compound on the mass spectrum is truly derived from the target compound
- a first mode that determines the allowable width of the confirmation ion ratio by the absolute value of the ratio
- a second mode that determines the allowable width of the confirmation ion ratio by the relative value of the ratio
- One of the modes is selected according to the magnitude relationship between the identification range of the confirmation ion ratio determined by the absolute value of the ratio and the identification range of the confirmation ion ratio determined by the relative value of the ratio.
- a mode selection unit for the user to select one of the modes b) a first identification range based on an absolute tolerance given as an absolute value of a ratio with respect to a standard confirmation ion ratio of a target confirmation ion when the third mode is selected; and a ratio And a second identification range based on a relative tolerance given as a relative value of each of the two, and either one of the first and second identification ranges is selected according to the magnitude relationship between the first and second identification ranges.
- An identification range determination unit that is defined as an identification range for determining the ratio; It is characterized by having.
- the data processing program according to the present invention which has been made to solve the above problems, has another mass-to-charge ratio for confirming the target compound in addition to the target ion having a specific mass-to-charge ratio characterizing the target compound.
- the confirmation ion to be determined is determined, the signal intensity between the target ion and the confirmation ion obtained by measurement on the target sample is obtained, and the suitability of the target ion is confirmed using the result, and the target compound is identified.
- a program for a data processing apparatus operating on a computer for performing quantitative determination wherein the computer is a) The signal intensity of the target ion and the signal intensity of the confirmation ion for determining that the peak presumed to be the target ion peak derived from the target compound on the mass spectrum is truly derived from the target compound
- the identification range of the confirmation ion ratio that is the intensity ratio
- a first mode that determines the allowable width of the confirmation ion ratio by the absolute value of the ratio
- a second mode that determines the allowable width of the confirmation ion ratio by the relative value of the ratio
- One of the modes is selected according to the magnitude relationship between the identification range of the confirmation ion ratio determined by the absolute value of the ratio and the identification range of the confirmation ion ratio determined by the relative value of the ratio.
- a mode selection unit for the user to select one of the modes b) a first identification range based on an absolute tolerance given as an absolute value of a ratio with respect to a standard confirmation ion ratio of a target confirmation ion when the third mode is selected; and a ratio And a second identification range based on a relative tolerance given as a relative value of each of the two, and either one of the first and second identification ranges is selected according to the magnitude relationship between the first and second identification ranges.
- An identification range determination unit that is defined as an identification range for determining the ratio; It is characterized by operating.
- the data processing apparatus for mass spectrometry according to the present invention is typically realized by operating the data processing program according to the present invention on a computer.
- the user can select the first mode (absolute permissible mode) and the second mode (relative permissible mode) provided in the conventional apparatus in the mode selection unit.
- the third mode can be further selected.
- the mode selection unit may be capable of selectively instructing one of the three modes by a pull-down menu or a radio button displayed on the display unit screen.
- the identification range determination unit sets the first identification range based on the absolute tolerance and the relative tolerance for the standard confirmation ion ratio of the target confirmation ions. And a second identification range based on.
- the absolute tolerance width and the absolute tolerance width are set as default values, and the default values may be used in common for all confirmation ions unless the user changes the setting.
- the data processing apparatus for mass spectrometry is preferably configured to further include an allowable width setting unit that allows the user to input an absolute allowable width and a relative allowable width for each confirmation ion.
- the allowable width setting unit is, for example, a table in which an absolute allowable width and a relative allowable width are shown for each confirmation ion in the same screen as the display screen for selection by the mode selection unit or in a different screen. Is displayed, and the allowable width may be entered as a numerical value in the table as necessary.
- the absolute allowable width or relative It is preferable to provide a column for only one of the allowable widths.
- the identification range determining unit compares, for example, both the identification ranges and is large ( Select the wider one and determine this as the identification range. If the identification range is determined in this way, for example, it is automatically determined whether or not the confirmation ion ratio based on the actual measurement result is within this identification range. If the identification range is within the identification range, the target ion is derived from the target compound. It is estimated that there is a high possibility.
- the data processing apparatus for mass spectrometry may further include a range limit setting unit that allows the user to specify an upper limit and / or a lower limit for the identification range for determining the actually confirmed ion ratio.
- the upper limit of the identification range may be set to 100% so that it is determined that the target ions cannot be identified when the confirmation ion ratio exceeds 100%.
- the identification range determination unit further narrows the identification range according to a predetermined upper limit value or lower limit value when an upper limit and / or a lower limit are designated by the range limit setting unit. Good.
- the upper limit value of the identification range selected by the comparison of the first and second identification ranges in the identification range determination unit exceeds 100%, for example, the upper limit of the identification range is 100%. Will be limited.
- the upper limit of the identification range used for the determination of the actually measured confirmation ion ratio is 100%, for example, regardless of the identification range calculated by the standard value of the confirmation ion ratio and the absolute permissible width or the relative permissible width. Value can be determined.
- the notification unit may perform a display indicating that identification is impossible instead of a display indicating the identification range.
- the user can immediately recognize that the specified confirmation ion or the standard value or allowable width of the confirmation ion ratio for determining the identification range is not appropriate.
- mass spectrometers and chromatograph mass spectrometers have a function to automatically create, display, and print reports in a predetermined format with analysis results, analysis conditions, and data analysis conditions attached.
- the data processing apparatus for mass spectrometry according to the present invention may further include an output unit that outputs the identification range determined by the identification range determination unit as a report. According to this configuration, the identification range used for target ion identification can be included in the report as one of the data analysis conditions.
- the mass spectrometry data processing apparatus and the data processing program according to the present invention even when it is necessary to confirm the target ions in accordance with the regulations disclosed in Non-Patent Document 2, the measurer himself is complicated and troublesome. It is possible to determine whether or not the confirmation ion ratio is suitable by determining an accurate identification range without performing calculation and comparison work. Therefore, even if the number of target compounds is large or the number of confirmation ions for a single target ion is large, the target ions are appropriate while preventing the occurrence of operational errors efficiently in a short time. It is possible to determine whether or not there is, and to proceed with substance identification work and quantitative work.
- FIG. 1 is a schematic configuration diagram of an embodiment of an LC-MS / MS system including a data processing apparatus according to the present invention.
- FIG. 1 is a schematic configuration diagram of an LC-MS / MS system according to this embodiment.
- This system produces a liquid chromatograph (LC) 1 that temporally separates the components contained in a sample, and each component separated by the liquid chromatograph 1 is ionized by an atmospheric pressure ion source such as an electrospray ionization method.
- a mass spectrometer (MS / MS) 2 such as a tandem quadrupole mass spectrometer that performs MS / MS measurement on the generated ions, and a data processing unit 3 for processing data acquired by the mass spectrometer 2
- an input unit 4 including a pointing device such as a keyboard and a mouse operated by the measurer, and a display unit 5 for displaying analysis results and the like.
- the data processing unit 3 includes a measurement data storage unit 31, a condition setting processing unit 33, an identification range calculation unit 34, a quantitative target confirmation processing unit 32 including a target identification processing unit 35, a quantitative calculation processing unit 36, and report creation
- the processing unit 37 is provided as a functional block.
- the substance of the data processing unit 3 is a personal computer, and the functions of each unit shown in the figure are realized by operating a dedicated data processing program installed in the personal computer on the computer.
- the mass spectrometer 2 can execute measurement modes such as MRM measurement, product ion scan measurement, precursor ion scan measurement, and neutral loss scan measurement. Since the MRM measurement is used in the quantitative analysis with respect to the above, it is assumed here that the MRM measurement is performed. In this case, for each target compound to be quantified, an MRM transition of one target ion (a combination of a mass-to-charge ratio of a precursor ion and a mass-to-charge ratio of a product ion) and an MRM transition of one or more confirmation ions are set as analysis conditions in the mass spectrometer 2. Under such analysis conditions, data obtained by the liquid chromatograph 1 and the mass spectrometer 2 are stored in the measurement data storage unit 31.
- MRM transition of one target ion a combination of a mass-to-charge ratio of a precursor ion and a mass-to-charge ratio of a product ion
- confirmation ions are set as analysis conditions in the mass spectrometer 2. Under such analysis conditions, data obtained by
- FIGS. 2 to 6 When quantifying the target compound based on the data collected as described above, refer to FIGS. 2 to 6 for data processing using MRM measurement data obtained for target ions and confirmation ions for the compound. However, it will be explained.
- 2 and 3 are diagrams showing examples of spectrum confirmation condition setting screens in the LC-MS / MS system of this embodiment, and FIGS. 4 to 6 are diagrams showing examples of confirmation ion detailed setting screens for each target ion. .
- the measurer Prior to the quantitative analysis, if the target ion is truly derived from the target compound using the confirmation ion, that is, if the target ion is to be identified, the measurer performs a predetermined operation with the input unit 4 In the quantitative target confirmation processing unit 32, the condition setting processing unit 33 displays a spectrum confirmation condition setting screen 6 as shown in FIG. 2 on the screen of the display unit 5. When it is desired to identify target ions using confirmation ions, the measurer puts a check mark in the “use confirmation ions” check box 61 by clicking the mouse or the like. In that case, the confirmation ion mode is selected.
- an “absolute allowable OR relative allowable” mode is provided as one of confirmation ion modes.
- this “absolute allowable OR relative allowable” mode may be selected.
- the “absolutely permissible” mode and the “relatively permissible” mode can be selected as in the conventional apparatus.
- confirmation ion ratio standard value: 90%, absolute tolerance width: 20%, relative tolerance width: 40% are preset as default values of parameters used when the “absolute tolerance OR relative tolerance” mode is executed. ing. Therefore, when the “absolute allowable OR relative allowable” mode is selected and designated, numerical values “20” and “40” are displayed in the absolute allowable width display box 64 and the relative allowable width display box 65, respectively. If it is desired to change the absolute allowable width and the relative allowable width for a plurality of confirmation ions, the numerical values displayed in the absolute allowable width display box 64 and the relative allowable width display box 65 can be directly rewritten by the input unit 4. Good.
- the “upper limit of identification range of confirmation ions is set to 100%” check box 66 is automatically set. A check mark is filled in. If you want to remove this restriction, that is, if you want to be able to set an identification range that exceeds 00%, click the “Set upper limit of identification range of confirmation ions to 100%” check box 66 and select the check mark. Just turn it off.
- the peak signal intensity on the mass spectrum ion intensity at a certain point obtained by MRM measurement
- the extracted ion are calculated. It is possible to select which of the peak intensity and the signal intensity based on the peak height of the peak (chromatogram peak) appearing in the chromatogram (mass chromatogram) is used.
- the confirmation ion base selection unit 67 in the spectrum confirmation condition setting screen 6 when the “spectrum” is selected, the former is selected, and when “waveform processing result” is selected, target ions can be identified by the confirmed ion ratio using the latter.
- the confirmation ion ratio is calculated based on the ion intensity obtained by MRM measurement at a predetermined time.
- the identification range calculation unit 34 displays the designated compound.
- the identification range of each confirmation ion with respect to the target ion set for (the MRM transition of the target ion) is calculated.
- the identification range calculation unit 34 calculates the identification range Pa in the absolute permissible mode according to the equation (1), and calculates the identification range Pr in the relative permissible mode according to the equation (2).
- Pr> Pa Pr is selected as the identification range.
- this selected identification range is 54 to 126 [%]
- the upper limit value exceeds 100 [%]
- the upper limit is set to 100 [%]
- the final identification range is 54 to 100 [%]. %].
- the identification range calculation unit 34 stores the MRM transition of the confirmation ion set for the instructed compound, the parameters, and the calculated identification range in the parameter table 71 in the confirmation ion detailed setting screen 7 as shown in FIG. indicate.
- the example shown in FIG. 4 shows the confirmation ions for three types of confirmation ions associated with target ions having an MRM transition of 414.20> 183.10 (precursor ion m / z: 414.20, product ion m / z: 183.10). This is a screen displayed when the ratio standard value, the absolute tolerance width, and the relative tolerance width are all the default values described above.
- the “default” in the absolute tolerance display field 74 and the relative tolerance display field 75 uses the numerical values displayed in the absolute tolerance display box 64 and the relative tolerance display box 65 of the spectrum confirmation condition setting screen 6. Means. In the example of FIG. 4, since the three types of confirmation ions have the same confirmation ion standard value, absolute allowable width, and relative allowable width, the identification range is also the same.
- the confirmation ion standard value display field 73, the absolute permissible width display field 74, and the relative permissible width display field 75 in the parameter table 71 of the confirmation ion detail setting screen 7 are arbitrarily set for each confirmation ion by an input operation using the input unit 4. Can be entered.
- FIG. 5 shows an example in which the confirmation ion standard values are different from each other for the five kinds of confirmation ions, and both the absolute allowable width and the relative allowable width are changed to “60”. If any of these three parameters is changed, the identification range also changes. Therefore, the identification range calculation unit 34 recalculates the identification range based on the changed parameter, and updates the numerical value in the identification range display column 76.
- the identification range display field 76 in the parameter table 71 of the confirmation ion detailed setting screen 7 displays the identification range of each of the plurality of confirmation ions corresponding to one target ion as a numerical value, and identifies If the identification range is inappropriate, “over limit” is displayed. Accordingly, the measurer can confirm the identification range for each confirmation ion at a glance, and can recognize that the identification range is not appropriate and appropriately adjust parameters such as the confirmation ion ratio standard value.
- the identification range calculation unit 34 displays the confirmation ion detailed setting screen 7 including the parameter table 71 provided with one allowable width display field 77 on the screen of the display unit 5 as shown in FIG. indicate. That is, in this case, the confirmation ion detail setting screen 7 is the same as the table on the conventional confirmation ion detail setting screen shown in FIG.
- the target identification processing unit 35 reads the measurement data for the target compound stored in the measurement data storage unit 31, and the signal of the spectral peak for the target ion The actually confirmed ion ratio is calculated from the intensity and the signal intensity of the spectrum peak with respect to the confirmed ions. Then, it is determined whether or not the calculated actual confirmation ion ratio falls within the identification range set for the confirmation ion. If so, the target ion is likely to be derived from the target compound. The estimation result of is given. The target identification processing unit 35 determines whether or not the actually confirmed ion is within the identification range for each confirmation ion associated with one target ion, and obtains the result of whether or not the target ion can be identified.
- the target identification processing unit 35 determines, for each target ion and confirmation ion, from the MRM measurement data. An extracted ion chromatogram is created, and peak detection is performed on the chromatogram to obtain a chromatogram peak. Then, the peak area value and height value (or one of them) are calculated. For example, the confirmation ion ratio is calculated using the ratio of the peak area value and the height value as the signal intensity value. The method for obtaining the confirmation ion ratio is not limited to this.
- the quantitative calculation processing unit 36 creates an extracted ion chromatogram of the target ions based on the measurement data, and the target compound A quantitative value (concentration value) is obtained using a calibration curve prepared in advance from the area value of the chromatogram peak corresponding to.
- the target ions can be easily confirmed in accordance with the very complicated AORC rule.
- the report creation processing unit 37 creates a report including specified contents such as a graph showing measurement results such as chromatograms and quantitative analysis results.
- the identification range for each confirmation ion used for confirmation of the target ions can be included in the content of the report.
- the report thus created can be confirmed on the screen of the display unit 5 and can also be output from a printer (not shown).
- the identification range is set based on the allowable range set as default or input (changed) by the measurer and the standard value of the confirmed ion ratio.
- the identification range may be determined from the given confirmation ion ratio standard value based on the correspondence table of the confirmation ion ratio standard value and the identification range prepared in advance.
- FIG. 7 is an example of a correspondence table between the confirmed ion ratio standard value and the identification range.
- the identification range calculation unit 34 refers to the correspondence range shown in FIG. 60 [%] is derived. Further, assuming that the standard value of the confirmed ion ratio is set to 80 [%], the identification range calculation unit 34 derives the identification range 30 to 95 [%] with reference to the correspondence table shown in FIG. Then, the derived identification range is determined as a final identification range as it is. Thus, the measurer can determine the identification range according to the standard value of the confirmed ion ratio without inputting parameters such as the allowable width one by one and without selecting the confirmed ion mode.
- the said Example is only an example of this invention, and even if it changes suitably in the range along the meaning of this invention, correction, and addition, it is clear that it is included by the claim of this application.
- the data processing apparatus according to the present invention is applied to the LC-MS / MS system, but the mass spectrometer need not be capable of MS / MS measurement.
- the data processing apparatus according to the present invention can be applied to GC-MS and GC-MS / MS in which a gas chromatograph and a mass spectrometer are combined.
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Abstract
Description
確認イオンを用いてターゲットイオンを同定する方法としては、「絶対許容」と「相対許容」の二つのモードがある。絶対許容とは文字通り、ターゲットイオンが目的化合物由来であると同定する同定範囲を確認イオン比の絶対値で以て規定するモードであり、確認イオン比をRi[%]、許容幅をRw[%]としたとき、同定範囲Paを、
Pa=Ri±Rw[%] …(1)
と定義する。他方、相対許容とは、同定範囲を確認イオン比の相対比率で以て規定するモードであり、確認イオン比をRi[%]、許容幅をRw[%]としたとき、同定範囲Prを、
Pr=Ri±(Ri×Rw)/100[%] …(2)
と定義する。
即ち、測定者は確認イオンモードとして絶対許容又は相対許容のいずれかを任意に選択することが可能であるものの、測定の目的や用途によっては、絶対許容と相対許容とを組み合わせる必要がある場合がある。
例えば、非特許文献2に開示されているAORC(公認競馬化学者協会)の薬物検査に関する規定では、絶対許容のときの確認イオン比と相対許容のときの確認イオン比とを個別に設定し、この個別に設定した確認イオン比を用いてそれぞれ同定範囲を求め、ターゲットイオン同定のための同定範囲として絶対許容幅と相対許容幅のいずれか大きいほうを採用することが定められている。また、上記AORCの規定では、同定範囲の上限を100%と定めて(つまり、確認イオンの信号強度がターゲットイオンの信号強度を超えた場合には同定不可と規定して)いる。
a)マススペクトル上で目的化合物由来のターゲットイオンのピークであると推測されるピークが真に目的化合物由来であると判定するための、前記ターゲットイオンの信号強度と前記確認イオンの信号強度との強度比である確認イオン比の同定範囲を決める際に、確認イオン比の許容幅を比率の絶対値で定める第1のモードと、確認イオン比の許容幅を比率の相対値で定める第2のモードと、確認イオン比の許容幅を比率の絶対値で定まる確認イオン比の同定範囲と比率の相対値で定まる確認イオン比の同定範囲との大小関係に応じていずれか一方を選択する第3のモードと、のいずれか一つをユーザが選択するためのモード選択部と、
b)前記第3のモードが選択された場合に、対象とする確認イオンの標準的な確認イオン比に対し、比率の絶対値として与えられた絶対許容幅に基づく第1の同定範囲と、比率の相対値として与えられた相対許容幅に基づく第2の同定範囲とをそれぞれ計算し、第1、第2なる二つの同定範囲の大小関係に応じていずれか一方を選択し、実測による確認イオン比を判定するための同定範囲として定める同定範囲決定部と、
を備えることを特徴としている。
a)マススペクトル上で目的化合物由来のターゲットイオンのピークであると推測されるピークが真に目的化合物由来であると判定するための、前記ターゲットイオンの信号強度と前記確認イオンの信号強度との強度比である確認イオン比の同定範囲を決める際に、確認イオン比の許容幅を比率の絶対値で定める第1のモードと、確認イオン比の許容幅を比率の相対値で定める第2のモードと、確認イオン比の許容幅を比率の絶対値で定まる確認イオン比の同定範囲と比率の相対値で定まる確認イオン比の同定範囲との大小関係に応じていずれか一方を選択する第3のモードと、のいずれか一つをユーザが選択するためのモード選択部と、
b)前記第3のモードが選択された場合に、対象とする確認イオンの標準的な確認イオン比に対し、比率の絶対値として与えられた絶対許容幅に基づく第1の同定範囲と、比率の相対値として与えられた相対許容幅に基づく第2の同定範囲とをそれぞれ計算し、第1、第2なる二つの同定範囲の大小関係に応じていずれか一方を選択し、実測による確認イオン比を判定するための同定範囲として定める同定範囲決定部と、
して動作させることを特徴としている。
本発明に係る質量分析用データ処理装置では、ユーザ(測定者)はモード選択部において、従来装置で設けられていた第1のモード(絶対許容モード)、第2のモード(相対許容モード)のほかに、さらに第3のモードを選択することができる。このモード選択部は、表示部の画面上に表示されたプルダウンメニューやラジオボタン等により三つのモードのいずれかを択一的に指示できるものとすればよい。ユーザがモード選択部により第3のモードを選択すると、同定範囲決定部は、対象とする確認イオンの標準的な確認イオン比に対し、絶対許容幅に基づく第1の同定範囲と、相対許容幅に基づく第2の同定範囲とをそれぞれ計算する。絶対許容幅及び絶対許容幅はそれぞれデフォルト値が定められていて、ユーザが特に設定を変更しない限りは、全ての確認イオンに対してこのデフォルト値が共通に用いられるようにするとよい。
典型的には、確認イオン比が100%を超えた場合にはターゲットイオンを同定できないと判断されるように、同定範囲の上限を100%に設定できるようにするとよい。
この構成によれば、同定範囲決定部において第1、第2の同定範囲の比較によって選択された同定範囲の上限値が例えば100%を超えていた場合に、その同定範囲の上限は100%に制限されることになる。これにより、確認イオン比の標準値と絶対許容幅又は相対許容幅とにより計算される同定範囲に依らず、実測の確認イオン比の判定に使用される同定範囲の上限を例えば100%など、任意の値に定めることができる。
この場合、定量対象である目的化合物毎に、一つのターゲットイオンのMRMトランジション(プリカーサイオンの質量電荷比とプロダクトイオンの質量電荷比との組)と、1個又は複数個の確認イオンのMRMトランジションとを、質量分析計2における分析条件として設定する。こうした分析条件の下で、液体クロマトグラフ1及び質量分析計2により得られたデータは測定データ保存部31に格納される。
Pa=Ri±Rw[%]=90±20[%]
Pr=Ri±(Ri×Rw)/100[%]=90±(90×0.4)=90±36[%]
と求まるから、この二つの同定範囲を比較し、大きいほうを選択する。上記例では、Pr>Paであるから、Prを同定範囲として選択する。ただし、選択されたこの同定範囲は54~126[%]であり、その上限値は100[%]を超えているから、上限を100[%]とし、最終的な同定範囲を54~100[%]と定める。
Pa=Ri±Rw[%]=200±60[%]
Pr=Ri±(Ri×Rw)/100[%]=200±(200×0.6)=200±120[%]
であるから、Prが同定範囲として選択される。選択されたこの同定範囲は80~320[%]であるので、上限値を100[%]に制限し、最終的な同定範囲を80~100[%]とする。また、MRMトランジションが130.00>27.00である確認イオンについては、
Pa=Ri±Rw[%]=300±60[%]
Pr=Ri±(Ri×Rw)/100[%]=300±(300×0.6)=300±180[%]
であるから、Prが同定範囲として選択される。この場合、選択されたこの同定範囲は120~480[%]であるから、同定範囲の下限値が100%を超えている。そのため、同定範囲の全てが100%を超えており、該同定範囲を用いてターゲットイオンを同定することは不可能である。そこで、そのことを示すべく「上限オーバー」とのテキストを同定範囲表示欄76中に表示する。
例えば上記実施例は、本発明に係るデータ処理装置をLC-MS/MSシステムに適用したが、質量分析計はMS/MS測定が可能である必要はない。また、本発明に係るデータ処理装置は、ガスクロマトグラフと質量分析計とを組み合わせたGC-MSやGC-MS/MSに適用することもできることは明らかである。
2…質量分析計
3…データ処理部
31…測定データ保存部
32…定量用ターゲット確認処理部
33…条件設定処理部
34…同定範囲計算部
35…ターゲット同定処理部
36…定量演算処理部
37…レポート作成処理部
4…入力部
5…表示部
6…スペクトル確認条件設定画面
61…「確認イオンを使う」チェックボックス
62…確認イオンモード選択ボタン
63…ドロップダウンメニュー
64…絶対許容幅表示ボックス
65…相対許容幅表示ボックス
66…「確認イオンの同定範囲の上限を100%とする」チェックボックス
7…確認イオン詳細設定画面
71…パラメータテーブル
72…MRMトランジション表示欄
73…確認イオン標準値表示欄
74…絶対許容幅表示欄
75…相対許容幅表示欄
76…同定範囲表示欄
Claims (7)
- 目的化合物を特徴付ける特定の質量電荷比を有するターゲットイオンのほかに該目的化合物を確認するための別の質量電荷比を有する確認イオンを定めておき、目的試料に対する測定により求められた前記ターゲットイオンと前記確認イオンとの信号強度を求め、その結果を利用して該ターゲットイオンの適否を確認したうえで目的化合物の同定又は定量を行うための質量分析用データ処理装置であって、
a)マススペクトル上で目的化合物由来のターゲットイオンのピークであると推測されるピークが真に目的化合物由来であると判定するための、前記ターゲットイオンの信号強度と前記確認イオンの信号強度との強度比である確認イオン比の同定範囲を決める際に、確認イオン比の許容幅を比率の絶対値で定める第1のモードと、確認イオン比の許容幅を比率の相対値で定める第2のモードと、確認イオン比の許容幅を比率の絶対値で定まる確認イオン比の同定範囲と比率の相対値で定まる確認イオン比の同定範囲との大小関係に応じていずれか一方を選択する第3のモードと、のいずれか一つをユーザが選択するためのモード選択部と、
b)前記第3のモードが選択された場合に、対象とする確認イオンの標準的な確認イオン比に対し、比率の絶対値として与えられた絶対許容幅に基づく第1の同定範囲と、比率の相対値として与えられた相対許容幅に基づく第2の同定範囲とをそれぞれ計算し、第1、第2なる二つの同定範囲の大小関係に応じていずれか一方を選択し、実測による確認イオン比を判定するための同定範囲として定める同定範囲決定部と、
を備えることを特徴とする質量分析用データ処理装置。 - 請求項1に記載の質量分析用データ処理装置であって、
一つのターゲットイオンに対し複数の確認イオンを定める場合に、確認イオン毎に前記絶対許容幅と前記相対許容幅とをユーザが入力する許容幅設定部をさらに備えることを特徴とする質量分析用データ処理装置。 - 請求項1又は2に記載の質量分析用データ処理装置であって、
実測による確認イオン比を判定するための同定範囲に対し上限及び/又は下限をユーザが指定する範囲制限設定部をさらに備えることを特徴とする質量分析用データ処理装置。 - 請求項3に記載の質量分析用データ処理装置であって、
前記同定範囲決定部は、前記範囲制限設定部により上限及び/又は下限が指定された場合に、予め決められた上限値又は下限値に従って同定範囲を狭めることを特徴とする質量分析用データ処理装置。 - 請求項3又は4に記載の質量分析用データ処理装置であって、
前記範囲制限設定部により上限及び/又は下限が指定された場合、計算された同定範囲の全てが予め決められた上限値又は下限値で制約された範囲を外れるときに、これをユーザに報知する報知部を備えることを特徴とする質量分析用データ処理装置。 - 請求項1~5のいずれかに記載の質量分析用データ処理装置であって、
前記同定範囲決定部により決定された同定範囲をレポートとして出力する出力部をさらに備えることを特徴とする質量分析用データ処理装置。 - 目的化合物を特徴付ける特定の質量電荷比を有するターゲットイオンのほかに該目的化合物を確認するための別の質量電荷比を有する確認イオンを定めておき、目的試料に対する測定により求められた前記ターゲットイオンと前記確認イオンとの信号強度を求め、その結果を利用して該ターゲットイオンの適否を確認したうえで目的化合物の同定又は定量を行うための、コンピュータ上で動作するデータ処理装置用プログラムであって、該コンピュータを、
a)マススペクトル上で目的化合物由来のターゲットイオンのピークであると推測されるピークが真に目的化合物由来であると判定するための、前記ターゲットイオンの信号強度と前記確認イオンの信号強度との強度比である確認イオン比の同定範囲を決める際に、確認イオン比の許容幅を比率の絶対値で定める第1のモードと、確認イオン比の許容幅を比率の相対値で定める第2のモードと、確認イオン比の許容幅を比率の絶対値で定まる確認イオン比の同定範囲と比率の相対値で定まる確認イオン比の同定範囲との大小関係に応じていずれか一方を選択する第3のモードと、のいずれか一つをユーザが選択するためのモード選択部と、
b)前記第3のモードが選択された場合に、対象とする確認イオンの標準的な確認イオン比に対し、比率の絶対値として与えられた絶対許容幅に基づく第1の同定範囲と、比率の相対値として与えられた相対許容幅に基づく第2の同定範囲とをそれぞれ計算し、第1、第2なる二つの同定範囲の大小関係に応じていずれか一方を選択し、実測による確認イオン比を判定するための同定範囲として定める同定範囲決定部と、
して動作させることを特徴とするデータ処理装置用プログラム。
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