WO2014049823A1 - クロマトグラフ質量分析装置 - Google Patents
クロマトグラフ質量分析装置 Download PDFInfo
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- WO2014049823A1 WO2014049823A1 PCT/JP2012/075054 JP2012075054W WO2014049823A1 WO 2014049823 A1 WO2014049823 A1 WO 2014049823A1 JP 2012075054 W JP2012075054 W JP 2012075054W WO 2014049823 A1 WO2014049823 A1 WO 2014049823A1
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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
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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
- G01N30/8651—Recording, data aquisition, archiving and storage
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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
- H01J49/0031—Step by step routines describing the use of the apparatus
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- the present invention relates to a chromatograph mass spectrometer that combines a chromatograph and a mass spectrometer, such as a gas chromatograph mass spectrometer (GC / MS) and a liquid chromatograph mass spectrometer (LC / MS).
- a chromatographic mass spectrometer that performs measurements such as selected ion monitoring (SIM) measurement, multiple reaction monitoring (MRM) measurement (sometimes referred to as “selective reaction monitoring (SRM) measurement”) for known compounds in an analyzer.
- SIM selected ion monitoring
- MRM multiple reaction monitoring
- SRM selective reaction monitoring
- a chromatograph combining a chromatograph such as a gas chromatograph (GC) or liquid chromatograph (LC) and a mass spectrometer such as a quadrupole mass spectrometer is used.
- a mass spectrometer such as a quadrupole mass spectrometer.
- Graph mass spectrometers are widely used.
- a SIM that selectively and repeatedly detects only ions having one or more specific mass-to-charge ratios m / z specified in advance. A measurement method is used.
- the first quadrupole is used.
- An ion having a specific mass-to-charge ratio (precursor ion) is selected in the mass filter, the ion is cleaved by collision-induced dissociation (CID) in the collision cell, and a specific mass-to-charge ratio among the product ions generated thereby.
- CID collision-induced dissociation
- An MRM measurement method is used in which ions having a are selected and detected in a second-stage quadrupole mass filter.
- the MRM measurement method has the advantage that the S / N of the signal can be improved and more sensitive quantification can be performed because the influence of the contaminant component can be removed by the two-stage quadrupole mass filter.
- one of the measurement conditions corresponds to the target compound according to the retention time of multiple target compounds. It is necessary to set a mass-to-charge ratio value.
- a mass-to-charge ratio value For example, in the chromatograph mass spectrometers described in Patent Documents 1 and 2, if an analyst prepares a compound table in which information about a compound to be measured is created, measurement conditions can be used based on the description information in the compound table. A function to automatically create a parameter table is provided. The parameter table automatic creation function in the conventional chromatograph mass spectrometer will be described with a specific example.
- FIG. 13 is an example of a compound table.
- the compound table includes information such as a compound name, an estimated retention time, a process time, a mass-to-charge ratio of quantitative ions, and a mass-to-charge ratio of confirmation ions for each compound.
- Quantitative ions are the ions that most characterize the compound.
- Confirmation ions are ions that characterize the compound and have a mass-to-charge ratio different from quantitative ions. This confirmation ion is generally used to confirm that the chromatogram peak of the quantitative ion is derived from the target compound using the relative ratio between the signal intensity of the confirmed ion peak and the signal intensity of the quantitative ion peak on the mass spectrum. Used.
- the retention time is a predicted value of the time to elute from the liquid chromatograph column.
- the process time is a parameter for specifying the time range in which the compound should be measured with the predicted retention time as the center, and the required time width is set including a margin that can absorb fluctuations in peak width and retention time. Is done. Therefore, even when the retention time of a certain compound fluctuates, the peak of the compound appears surely within the range of the retention time of the compound ⁇ process time.
- FIG. 14 shows the relationship between the peak of a certain compound on the chromatogram, the retention time, and the process time.
- a segment is set by appropriately dividing the measurement time based on the compound table as described above.
- a segment is a minimum time unit for setting measurement conditions such as an ion condition to be measured, and the measurement conditions can be switched for each segment.
- the segment boundary is automatically set at a time when the retention time interval of the compound to be measured is sufficiently large.
- [Retention time of a certain compound X + A] ⁇ [Retention time of compound X + 1 having the next largest retention time ⁇ A] (where ⁇ A: process time)
- ⁇ A process time
- the elution time range for compound X (retention time ⁇ A) and the elution time range for compound X + 1 do not overlap, typically the retention time of compound X and the retention time of compound X + 1 A segment boundary is set at an intermediate time position, and the measurement time is divided into other segments by the boundary.
- FIG. 15 is a chromatogram for explaining the segmentation method.
- the segment boundary is not set. That is, in this case, the compound X and the compound X + 1 belong to the same segment.
- a segment boundary is defined between the retention time of Compound X and the retention time of Compound X + 1. Therefore, compound X and compound X + 1 belong to different segments. According to such an algorithm, segments can be defined for all compounds listed in the compound table (or some compounds specified by the analyst).
- FIG. 16 is an example of a parameter table of a measurement method that is automatically created based on the compound table shown in FIG.
- measurement conditions for one compound are grouped in one line as “measurement event”.
- the number of the segment in which the measurement of the compound is performed (the segment number is indicated with “#” below)
- measurement start time, measurement end time, event time, measurement ion Includes mass to charge ratio, dwell time, etc.
- the mass-to-charge ratio of the measurement ion the mass-to-charge ratio m / z-1 of the quantitative ion and the mass-to-charge ratio m / z-2 of the confirmation ion of the compound to be measured are set.
- the measurement start time and measurement end time are the start time and end time of the segment.
- the event time is a unit time for repeating the measurement event.
- the dwell time is the time for the detector to actually take in and accumulate ions, that is, the data collection time.
- FIG. 5 is a schematic diagram showing the correspondence between the segment and the compound shown in FIG. 16 with the horizontal axis representing time.
- the event time is automatically calculated from a measurement point time interval called a loop time set in advance and the number of compounds measured in one segment.
- the dwell time is the time when the detector actually takes ions
- the event time is the waiting time until the voltage stabilizes when the applied voltage to the quadrupole mass filter is changed in addition to this dwell time.
- Time hereinafter referred to as “voltage stabilization wait time”.
- the dwell time also depends on the number of ions to be measured during one event time. Therefore, the dwell time Td for each ion is obtained by the following equation (2).
- Td (event time ⁇ voltage stabilization wait time) / [number of ions to be measured] (2)
- the voltage stabilization waiting time per ion to be measured is set to 1 [msec].
- the dwell time is too short, the influence of external factors such as drift and noise is relatively likely to appear in the signal intensity data obtained by the detector, making it difficult to ensure sufficient measurement reproducibility. Therefore, in order to perform accurate quantification, it is necessary to secure a dwell time longer than a certain extent. In order to lengthen the dwell time, it is necessary to lengthen the event time, and it is desirable to increase the segment break as much as possible to reduce the number of compounds to be measured allocated to one segment.
- the conventional automatic parameter table creation algorithm described above when there are a large number of compounds having a short retention time, a segment cannot be set finely, and a large number of compounds are assigned to one segment.
- the dwell time for each ion is inevitably shortened, and sufficient measurement reproducibility and measurement sensitivity cannot be obtained, resulting in a decrease in quantitative accuracy.
- the compounds A to T are assigned to one segment, and as a result, the dwell time is shortened.
- the present invention has been made in order to solve the above problems, and the object of the present invention is to focus on dwell time, loop time, and further retention time for each ion derived from each compound for all compounds to be measured. It is an object of the present invention to provide a chromatographic mass spectrometer capable of performing highly accurate quantitative analysis by appropriately setting segments so that the elution time range to be satisfied satisfies the required value as much as possible.
- the present invention provides a chromatograph that separates a plurality of compounds in a sample in a time direction and ions derived from the compounds separated by the chromatograph according to a mass-to-charge ratio.
- a mass spectrometer that detects and detects a selected ion with respect to one or more specific mass-to-charge ratios before and after a chromatogram peak corresponding to a target compound.
- a) Compound table holding unit for storing a compound table including information specifying at least the predicted retention time or the elution time range and one or more mass-to-charge ratios to be measured for each compound to be measured
- the measurement condition information creation unit includes: b1) A segment which is a measurement time unit is set by setting a boundary at a time position where the elution time ranges of each compound included in the compound table do not overlap, and one or a plurality of compounds to be measured are assigned to each segment 1 Next segment setting part, b2) In each segment set by the primary segment setting unit, the number of compounds assigned
- a dwell time that is a data collection time per ion derived from one compound is calculated, and it is determined whether or not the dwell time is lower than a predetermined dwell time lower limit value.
- a primary determination unit to perform, b3) When the primary determination unit determines that the dwell time calculated in a certain segment is lower than a predetermined dwell time lower limit, the dwell time is equal to or higher than the lower limit. For compounds that have an elution time range that straddles the newly defined segment boundary after forcibly dividing the segment into multiple segments, measurement is performed on each segment on both sides of the segment boundary.
- the “elution time range” of a certain compound is set to ensure a predetermined time width determined in consideration of the peak width, peak position fluctuation, etc. before and after the predicted retention time of the compound. It is a time range. Since the time width varies depending on how much the margin is taken into consideration, the time width may be set as a default in advance, but may be set by an analyst. When the time width is determined by default, the elution time range is uniquely determined when the holding time is determined. Therefore, the elution time range can be determined in association with each compound in the compound table. If only the retention time is defined in association with each compound in the compound table, the elution time range of each compound can be calculated from the retention time and the default or externally specified time width. is there. Further, the “loop time that is the time interval between measurement points of each ion given in advance” and the “lower limit value of dwell time given in advance” may be set as defaults in advance, but can be input by the analyst. You may do it.
- the primary segment setting unit sets a segment by setting a boundary at a time position where the elution time ranges of each compound included in the compound table do not overlap and dividing the time at the boundary. Then, one or more compounds to be measured are assigned to each segment. At this time, since the elution time range of one compound does not cross the segment boundary, one compound is assigned to only one segment. In addition, if there are many compounds with similar retention times, a large number of compounds are assigned to one segment. Conversely, if there are no compounds with similar retention times before and after, only one compound is present in one segment. Will be assigned.
- the primary determination unit determines the dwell time based on the number of compounds assigned to the segment, the loop time given in advance, and the number of ions to be measured for one compound. Calculate Then, it is determined whether or not the calculated dwell time is below the dwell time lower limit value.
- the segment division processing unit forcibly divides the segment into a plurality of segments for the segment whose calculated dwell time is below the dwell time lower limit value.
- the newly defined segment boundary by segment re-division does not satisfy the conditions for determining the segment boundary in the primary segment setting section. Therefore, the elution time range of at least one compound among the compounds assigned to the segment before division straddles a newly defined segment boundary. Therefore, for a compound having an elution time range that crosses the newly defined segment boundary, the compound is assigned so that the measurement is performed in the segments on both sides sandwiching the segment boundary. In this case, one compound is assigned not only to one segment but also to a plurality of temporally adjacent segments. As a result, even when the position of the peak is shifted, it is possible to avoid a lack of peak without obtaining a part of the data constituting the peak.
- the number of compounds assigned to each segment should be reduced. Therefore, the dwell time becomes longer than before the segment re-division and the compound re-assignment, and the possibility that the dwell time becomes equal to or higher than the lower limit of the dwell time is increased. In general, if the number of divisions when one segment is forcibly divided is large, the number of compounds per segment is likely to decrease, and the dwell time tends to be long. However, even when one segment is forcibly divided into a plurality of segments, the dwell time does not always exceed the dwell time lower limit value.
- a dwell is generated in each segment generated by the subdivision.
- a secondary determination unit that recalculates the time and determines whether or not the dwell time is below a predetermined dwell time lower limit; When the secondary determination unit determines that the recalculated dwell time is below the lower limit of the dwell time, the segment division processing unit forcibly divides one segment before the division or the number of divisions It is preferable to reconfigure segment re-division and re-assignment of compounds by changing the position of.
- a new segment can be obtained.
- a boundary can be set.
- the number of divisions such as two divisions and three divisions may be specified to forcibly divide one segment into a plurality of segments.
- the dwell time tends to be longer as the number of compounds assigned to one segment is smaller. Therefore, if only the dwell time is considered, the number of divisions should be larger.
- the total number of segments and the number of rows in the measurement condition table (cumulative number of compounds allocated to each segment) are generally limited by the device specifications. If it is increased too much, this constraint cannot be satisfied.
- the segment division processing unit is configured so that the dwell time is equal to or greater than the dwell time lower limit value, and the total number of segments and / or the number of rows in the measurement condition table are within a predetermined value.
- segment subdivision and compound reassignment may be performed.
- the specified conditions may not be met. Therefore, preferably, in the chromatograph mass spectrometer according to the present invention, when the specified condition cannot be satisfied or when it is determined that it is highly likely that the specified condition is not satisfied, an attention calling unit that calls attention to change the condition is further provided. It is good to have a configuration provided. Specifically, for example, in a configuration in which an analyst inputs and sets dwell time, loop time, and the like, a warning display indicating that such input settings are not appropriate may be output on the display screen.
- the analyzer does not need to perform complicated calculations, operations, or operations.
- a parameter table of the measurement method is automatically created so that the dwell time for ions derived from all the compounds exceeds the required value.
- the block diagram of the principal part of LC / MS which is 1st Example of this invention The figure which shows an example of the input setting screen in LC / MS of 1st Example.
- segmentation process execution in LC / MS of 1st Example (first half part).
- segmentation process execution in LC / MS of 1st Example (second half part).
- the schematic diagram which shows an example of the correspondence of the segment and compound which were primarily produced from the compound table shown in FIG. 13 by the automatic segment division
- segmented segment # 1 in FIG. The schematic diagram which shows an example of the correspondence of the segment after adjusting the allocation to a segment about the compound after the subdivision shown in FIG. 6 about the compound whose elution time range exceeds a segment boundary.
- the schematic diagram which shows an example of the correspondence of the segment and compound after adjusting the allocation to a segment about the compound after the re-division shown in FIG. 10 about the compound whose elution time range exceeds a segment boundary.
- FIG. 1 is a block diagram of the main part of the LC / MS according to the first embodiment.
- the LC / MS of this example includes a liquid chromatograph part (LC part) 1 that separates various compounds contained in a sample in the time direction, and a mass spectrometer part (MS part) 2 that performs mass analysis of the separated various compounds. And including.
- LC part liquid chromatograph part
- MS part mass spectrometer part
- the LC unit 1 includes a mobile phase container 11 that stores a mobile phase, a liquid feed pump 12 that sucks the mobile phase and delivers it at a constant flow rate, an injector 13 that injects a sample into the mobile phase at a predetermined timing, and various compounds in the sample.
- a column 14 that separates in the time direction.
- the MS section 2 includes a spray nozzle 21 for electrospraying an eluate containing a compound eluting from the column 14 into the atmosphere and ionizing it, a heating capillary 22 for guiding ions derived from the compound in the sample into the vacuum atmosphere, and ions.
- Ion guides 23 and 24 that are transported to the subsequent stage while being converged, a quadrupole mass filter 25 that passes only ions having a specific mass-to-charge ratio, and a detector that detects ions that have passed through the quadrupole mass filter 25 26.
- a detection signal obtained by the detector 26 of the MS unit 2 is converted into a digital value by an A / D converter (not shown) and then input to the data processing unit 3.
- the data processing unit 3 performs a predetermined calculation process to create a mass spectrum or a chromatogram or to perform a quantitative analysis.
- the control unit 4 controls the operations of the LC unit 1, the MS unit 2, and the data processing unit 3, respectively.
- the control unit 4 includes a measurement method generation unit 41 as a functional block characteristic of the present invention.
- the control unit 4 includes a storage unit 5 in which a compound table and a measurement method parameter table are stored, and an analyst (user).
- the data processing unit 3 and the control unit 4 use a personal computer (PC) including a CPU, a memory, etc. as hardware, and execute control / processing software installed in the PC in advance on the PC.
- PC personal computer
- the quadrupole mass filter 25 of the MS unit 2 is driven in the SIM measurement mode so as to selectively pass a mass-to-charge ratio of ions derived from a compound to be quantified (hereinafter referred to as a target compound).
- the injector 13 injects a sample into the mobile phase while the mobile phase is being fed to the column 14 at a substantially constant flow rate by the liquid feed pump 12.
- the injected sample is introduced into the column 14 along the flow of the mobile phase, and various compounds in the sample are temporally separated while passing through the column 14.
- the target compound elutes from the outlet of the column 14 around the time when a predetermined time has passed with respect to the sample injection time (that is, near the retention time of the target compound), and the target compound reaches the spray nozzle 21 of the MS section 2 and Ions derived from the compound are generated.
- the ions are introduced into the quadrupole mass filter 25 through the heating capillary 22 and the ion guides 23 and 24.
- the quadrupole mass filter 25 selectively passes only ions having a specific mass-to-charge ratio derived from the target compound, and the passed ions reach the detector 26 and are detected.
- the data processing unit 3 creates a mass chromatogram (also referred to as an extracted ion chromatogram) indicating the relationship between the ion intensity at the specific mass-to-charge ratio and the passage of time based on the data based on the detection signal obtained from the detector 26.
- the data processing unit 3 extracts a peak derived from the target compound on the mass chromatogram, and calculates the peak area value. Then, the concentration of the target compound is calculated with reference to a calibration curve showing the relationship between the peak area value and the concentration (content) of the target compound, which are created in advance based on the results of measuring a standard sample or the like. If there are multiple compounds to be quantified, create a mass chromatogram based on the data obtained by performing SIM measurement for different mass-to-charge ratios for each compound, and in the same way as above, the peak area value derived from the target compound. And the concentration of the compound is calculated from the area value.
- the control unit 4 controls the operations of the LC unit 1, the MS unit 2, and the data processing unit 3 according to the parameter table stored in the measurement method parameter table storage unit 52 of the storage unit 5.
- the control unit 4 includes a measurement method generation unit 41 that automatically creates a parameter table from the compound table, and the measurement method generation unit 41 has a characteristic function that is different from conventional parameter table automatic generation. is doing.
- 3 and 4 are flowcharts at the time of the automatic segmentation process, which is characteristic in the measurement method parameter table creation process.
- the compound table shown in FIG. 13 is stored in advance in the compound table storage unit 51 and a parameter table is automatically created for this compound table will be described as an example.
- the analyst inputs and sets the dwell time lower limit D, the loop time R, the process time ⁇ A, and the like as measurement conditions from the input unit 6 prior to the measurement method parameter table creation process (step S1). Specifically, when the analyst performs a predetermined operation on the input unit 6, an input setting screen 100 as shown in FIG. 2 is displayed on the screen of the display unit 7. Therefore, the analyst inputs appropriate numerical values in the text input field 101.
- the Dwell time D is 10 [msec]
- the loop time R is 300 [msec]
- the process time ⁇ A is ⁇ 0.1 [min].
- the Dwell time D is the lower limit value of the dwell time, and is hereinafter referred to as a dwell time lower limit value D.
- step S2 When the analyst clicks the “automatic creation” button 102 in the state where the above input setting is completed, execution of the measurement method automatic creation processing is instructed (step S2).
- the measurement method generating unit 41 reads out the designated compound table from the compound table storage unit 51, and first, based on the retention time of each compound listed in the compound table and the set process time.
- a segment is set by appropriately dividing the entire measurement time or a part thereof (step S3). Specifically, two compounds having adjacent retention times satisfying the conditional expression shown in the equation (1) are searched, and the time is divided using the midpoint of the retention times of the two compounds as a segment boundary.
- step S3 corresponds to the process in the primary segment setting unit in the present invention.
- the event time and the dwell time of each ion are calculated in each segment in a state where the segmentation is performed primarily as described above (step S4).
- the process of step S6 corresponds to the process of the primary determination unit in the present invention.
- step S6 If it is determined No in step S6, the dwell time of segment #n does not satisfy the requirement of the dwell time lower limit value, so segmentation of the segment is attempted to increase the dwell time.
- step S7 for all the compounds assigned to the segment #n, one segment #n is forcibly subdivided so that c compounds are included in order from the smallest retention time.
- the initial value of c is set to “4”.
- segment # 1 is subdivided.
- the segment boundary may be set to an intermediate time between the retention times of the preceding and subsequent compounds.
- the elution time range of a part of the compound straddles the segment boundary.
- the elution time range of Compound A is 10.222 ⁇ 0.1 [min] (that is, 10.122 to 10.322 [min]), but the boundary between segments # 1 and # 2 generated by subdivision is 10.260 [min].
- the elution time range of Compound A crosses the boundary between segments # 1 and # 2. Therefore, as shown in FIG. 5, if the measurement of compound A is performed only in segment # 1 after subdivision, when the peak of compound A is displaced, a part of the peak (rear part) There is a risk of loss. Therefore, for compounds in which the elution time range of retention time ⁇ A crosses the newly set segment boundary, compound allocation is adjusted so that measurement is performed in both of the two segments across the boundary. (Step S8).
- step S9 it is determined whether or not the calculated dwell time is equal to or greater than the dwell time lower limit value in all of the new segments generated by subdividing the segment #n (step S9).
- the dwell time is equal to or greater than the lower limit of the dwell time in all the segments newly generated from the segment # 1 before the division including other segments. Accordingly, the process proceeds from step S9 to S11.
- the total number of segments and the total number of events at that time are calculated, and it is determined whether or not they are below the upper limit number of segments and the upper limit number of events respectively determined in the apparatus (step S11).
- the segment number upper limit value is 128 and the event number upper limit value is 512, which are based on restrictions on the specifications of the apparatus, and therefore the upper limit value differs depending on the apparatus. If the total number of segments and the total number of events exceed the upper limit value of the segment number and the upper limit value of the event number, such measurement cannot be realized even if the dwell time is greater than the upper limit value of the dwell time.
- step S12 when it is determined No in step S11, the parameter c for the number of compounds for segment subdivision is increased by 1 (step S12), and the process returns to step S7 to redivide segment #n and recompute the compound. Redo the assignment.
- Increasing the value of c usually reduces the number of segment divisions, so the dwell time may be shortened, but instead the total number of segments and total number of events decreases. Therefore, when c is sequentially increased, it is possible to find a state in which the total number of segments and the total number of events are within the upper limit value of the segment number and the upper limit number of events, respectively, while the dwell time is maintained at the dwell time lower limit value or more.
- step S13 it is determined whether or not segment #n before re-division is the last segment. If it is not the last segment, the variable n is incremented (step S13) and the process returns to step S6. Therefore, processing is performed in time order for all the segments set in step S3, and when the final segment is reached, Yes is determined in step S13 and the processing ends.
- step S13 the dwell time greatly exceeds the dwell time lower limit value, so that the process proceeds from step S6 to S13, where Yes is determined in step S13, and the entire process ends.
- the dwell time cannot be expected to increase, although it may decrease. That is, the dwell time when c is the initial value is the longest. Accordingly, when it is determined No in step S9, a parameter whose dwell time is equal to or greater than the dwell time lower limit value cannot be found, and thus the apparatus waits as it is after the warning display is output on the screen of the display unit 7 ( Step S10).
- the analyst who has seen this display for example, returns to the input setting screen 100 shown in FIG.
- step S11 the process is continued. That is, in this case, although the required dwell time lower limit value is not satisfied, it is possible to try to automatically create a parameter table with a dwell time as long as possible.
- FIG. 8 is an example of a parameter table of a measurement method that is automatically created based on the compound table shown in FIG.
- the dwell time of 10 msec or more is secured for all the compounds A to U, and the peak area is calculated based on sufficiently high signal-to-noise ratio data. It can be said that it is possible. Thereby, it is possible to perform quantification with higher accuracy than conventional LC / MS.
- FIG. 9 is a flowchart at the time of automatic segment division processing in the LC / MS of the second embodiment, and corresponds to the flowchart of FIG. 4 in the first embodiment. That is, the processes in steps S1 to S4 are the same as those in the first embodiment, and a description thereof will be omitted. Also, the processing contents of steps S5 and S6 in FIG. 9 are the same as the respective steps in FIG. 4 in the first embodiment.
- a relatively small initial value c is set at the time of segment re-division, and when the total number of segments or the total number of events exceeds the upper limit value, the value of c is sequentially set. I tried to increase it.
- the advantage of this algorithm is that the segment re-segmentation that maximizes the dwell time is executed first, and the dwell time is gradually shortened. It is possible to lengthen the time. As a result, it is very advantageous in terms of quantitative accuracy.
- a relatively large initial value a is set at the time of segment re-division, and when the dwell time is below the dwell time lower limit value, the value of a is sequentially set.
- the initial value of a is set to, for example, about a half of the number of compounds assigned to the segment.
- the initial value of a is set to “11” as an example.
- Segment # 1 is subdivided.
- one segment # 1 before subdivision is divided into two, and the new segment includes 11 different compounds (compounds AK) and 9 compounds, respectively.
- Compounds L to T are assigned.
- the segment boundary may be set to an intermediate time between the retention times of the compounds K and L before and after the segment boundary.
- the compound having an elution time range of retention time ⁇ A that straddles the newly set segment boundary has two The compound assignment is adjusted so that the measurement is performed in both of the segments (step S21).
- step S22 it is determined whether or not the dwell time calculated in each of the new segments generated by subdividing the segment #n is equal to or greater than the dwell time lower limit value.
- step S24 the total number of segments and the total number of events at that time are calculated, and it is determined whether or not they are within the upper limit number of segments and the upper limit number of events respectively determined in advance in the device. .
- step S23 If it is determined No in step S22, a is decreased by 1 (step S23), and the process returns to step S20. Therefore, by repeating steps S20 to S23, the number of segments generated by subdivision increases, and accordingly, the dwell time becomes longer and Yes in step S22. In this case, even if the dwell time is equal to or greater than the dwell time lower limit value, if the total number of segments and the total number of events exceed the upper limit value (No in step S24), a warning display is output and a standby state is entered. Although not shown in FIG. 9, since the minimum value of a is 1, even if a becomes 1, if it is determined No in step S22, a warning display is also output.
- FIG. 12 is an example of a parameter table of a measurement method that is automatically created based on the compound table shown in FIG. Compared with FIG. 8, the dwell time is short overall, but the dwell time for all compounds A to U is still 10 [msec] or more, and the peak area is calculated based on sufficiently high signal-to-noise ratio data. It can be said that it is possible.
- segmentation is automatically executed so as to satisfy the dwell time, loop time, and process time specified by the user. Then, a measurement target compound is assigned to each segment.
- SIM measurement according to the measurement method parameter table created in this way, accurate chromatogram peaks without any defects can be obtained for all the measurement target compounds, so that highly accurate quantification can be performed.
- the MS unit 2 is a single type quadrupole mass spectrometer, but in the LC / MS / MS in which the MS unit 2 is a triple quadrupole mass spectrometer.
- SIM measurement the present invention is naturally applicable to MRM measurement in which it is necessary to set measurement conditions such as the elution time range and the mass-to-charge ratio to be measured for each compound. It is also clear that the present invention can be applied to GC / MS using GC instead of LC or GC / MS / MS.
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Abstract
Description
[或る化合物Xの保持時間+A]<[保持時間が次に大きな化合物X+1の保持時間-A] (ただし、±A:プロセス時間) …(1)
という条件式を満たす場合に、化合物Xに対する溶出時間範囲(保持時間±A)と化合物X+1に対する溶出時間範囲とが重ならない時間位置、典型的には、化合物Xの保持時間と化合物X+1の保持時間との中間の時間位置にセグメント境界が設定され、該境界により測定時間は別のセグメントに分割される。
Td=(イベント時間-電圧安定待ち時間)/[測定対象イオン数] …(2)
図16の例では、一つの測定対象イオン当たりの電圧安定待ち時間を1[msec]としており、その結果、各イオンに対するドウェル時間Tdは(15-1×2)/2=6.5[msec]、である。
a)測定対象である化合物毎に少なくとも、予測される保持時間又は該溶出時間範囲、測定すべき1又は複数の質量電荷比、を特定する情報を含む化合物テーブルを記憶しておく化合物テーブル保持部と、
b)前記化合物テーブルに挙げられている各化合物についてSIM測定又はMRM測定を実行するために、該化合物テーブルに含まれる情報に基づいて、測定対象である化合物毎に少なくとも、実際の測定開始時間及び測定終了時間、並びに測定する質量電荷比を特定する情報を含む測定条件テーブルを作成する測定条件情報作成部と、
を備え、前記測定条件情報作成部は、
b1)前記化合物テーブルに含まれる各化合物の溶出時間範囲が重ならない時間位置に境界を定めることで測定時間単位であるセグメントを設定し、各セグメントにそれぞれ1又は複数の測定対象の化合物を割り当てる1次セグメント設定部と、
b2)前記1次セグメント設定部により設定された各セグメントにおいて、当該セグメントに割り当てられた化合物の数と、予め与えられた各イオンの測定点時間間隔であるループ時間と、一つの化合物について測定すべきイオンの数と、に基づいて、一つの化合物に由来する一つのイオン当たりのデータ収集時間であるドウェル時間を計算し、該ドウェル時間が予め与えられたドウェル時間下限値を下回るか否か判定する1次判定部と、
b3)前記1次判定部により、或る一つのセグメントにおいて計算されたドウェル時間が予め与えられたドウェル時間下限値を下回ると判定された場合に、ドウェル時間が該下限値以上となるように、当該一つのセグメントを強制的に複数のセグメントに分割した上で、その新たに定められたセグメント境界を跨るような溶出時間範囲を持つ化合物については、そのセグメント境界を挟む両側のセグメントでそれぞれ測定を行うように該化合物を割り当てるべくセグメント再分割及び化合物の再割当てを実行するセグメント分割処理部と、
を有することを特徴としている。
セグメント分割処理部は、前記2次判定部により、再計算されたドウェル時間がドウェル時間下限値を下回ると判定された場合には、分割前の一つのセグメントを強制的に分割する分割数又は分割の位置を変更してセグメント再分割及び化合物の再割当てをやり直す構成とするとよい。
なお、データ処理部3及び制御部4は、CPU、メモリなどを含んで構成されるパーソナルコンピュータ(PC)をハードウエアとし、PCに予めインストールされた制御/処理ソフトウエアを該PCで実行することによりその機能を実現することができる。
図3及び図4は、測定メソッドパラメータテーブル作成処理の中で特徴的である自動セグメント分割処理時のフローチャートである。ここでは、図13に示した化合物テーブルが予め化合物テーブル格納部51に格納されており、この化合物テーブルを対象としパラメータテーブルを自動的に作成する場合を例に挙げて説明する。
例えば上記実施例では、ドウェル時間が条件を満たさないセグメントを細分化する際に、保持時間が近い化合物を所定数(第1実施例ではc個、第2実施例ではa個)集めて新たなセグメントとしていたが、化合物の個数ではなく、一つのセグメントの分割数を決めて強制的に再分割するようにしてもよい。また、それ以外のアルゴリズムに従って再分割を行ってもよい。
また、LCの代わりにGCを用いたGC/MSやGC/MS/MSに本発明を適用可能なことも明らかである。
11…移動相容器
12…送液ポンプ
13…インジェクタ
14…カラム
2…MS部
21…スプレーノズル
22…加熱キャピラリ
23、24…イオンガイド
25…四重極マスフィルタ
26…検出器
3…データ処理部
4…制御部
41…測定メソッド生成部
5…記憶部
51…化合物テーブル格納部
52…測定メソッドパラメータテーブル格納部
6…入力部
7…表示部
100…入力設定画面
101…テキスト入力欄
102…「自動作成」ボタン
Claims (3)
- 試料中の複数の化合物を時間方向に分離するクロマトグラフと、該クロマトグラフで分離された化合物由来のイオンを質量電荷比に応じて分離して検出する質量分析装置と、を組み合わせたクロマトグラフ質量分析装置であって、前記質量分析装置は、目的化合物に対応するクロマトグラムピークの前後で1乃至複数の特定の質量電荷比に対する選択イオンモニタリング(SIM)測定又は多重反応モニタリング(MRM)測定を実行するクロマトグラフ質量分析装置において、
a)測定対象である化合物毎に少なくとも、予測される保持時間又は該溶出時間範囲、測定すべき1又は複数の質量電荷比、を特定する情報を含む化合物テーブルを記憶しておく化合物テーブル保持部と、
b)前記化合物テーブルに挙げられている各化合物についてSIM測定又はMRM測定を実行するために、該化合物テーブルに含まれる情報に基づいて、測定対象である化合物毎に少なくとも、実際の測定開始時間及び測定終了時間、並びに測定する質量電荷比を特定する情報を含む測定条件テーブルを作成する測定条件情報作成部と、
を備え、前記測定条件情報作成部は、
b1)前記化合物テーブルに含まれる各化合物の溶出時間範囲が重ならない時間位置に境界を定めることで測定時間単位であるセグメントを設定し、各セグメントにそれぞれ1又は複数の測定対象の化合物を割り当てる1次セグメント設定部と、
b2)前記1次セグメント設定部により設定された各セグメントにおいて、当該セグメントに割り当てられた化合物の数と、予め与えられた各イオンの測定点時間間隔であるループ時間と、一つの化合物について測定すべきイオンの数と、に基づいて、一つの化合物に由来する一つのイオン当たりのデータ収集時間であるドウェル時間を計算し、該ドウェル時間が予め与えられたドウェル時間下限値を下回るか否か判定する1次判定部と、
b3)前記1次判定部により、或る一つのセグメントにおいて計算されたドウェル時間が予め与えられたドウェル時間下限値を下回ると判定された場合に、ドウェル時間が該下限値以上となるように、当該一つのセグメントを強制的に複数のセグメントに分割した上で、その新たに定められたセグメント境界を跨るような溶出時間範囲を持つ化合物については、そのセグメント境界を挟む両側のセグメントでそれぞれ測定を行うように該化合物を割り当てるべくセグメント再分割及び化合物の再割当てを実行するセグメント分割処理部と、
を有することを特徴とするクロマトグラフ質量分析装置。 - 請求項1に記載のクロマトグラフ質量分析装置であって、
前記測定条件情報作成部は、一つのセグメントを強制的に複数に分割するセグメント再分割及び化合物の再割当てを実行したあとに、その再分割により生成された各セグメントにおいてドウェル時間を再計算し、該ドウェル時間が予め与えられたドウェル時間下限値を下回るか否か判定する2次判定部をさらに有し、
前記セグメント分割処理部は、前記2次判定部により、再計算されたドウェル時間がドウェル時間下限値を下回ると判定された場合に、分割前の一つのセグメントを強制的に分割する分割数又は分割の位置を変更してセグメント再分割及び化合物の再割当てをやり直すことを特徴とするクロマトグラフ質量分析装置。 - 請求項2に記載のクロマトグラフ質量分析装置において、
前記セグメント分割処理部は、該当する一つのセグメントに割り当てられている複数の化合物を、保持時間が隣接する既定の個数の化合物毎に分けることで、新たなセグメント境界を定めることを特徴とするクロマトグラフ質量分析装置。
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