WO2012073713A1 - 液体クロマトグラフ、液体クロマトグラフ用試料導入装置、および液体クロマトグラフ用試料導入装置の洗浄方法 - Google Patents
液体クロマトグラフ、液体クロマトグラフ用試料導入装置、および液体クロマトグラフ用試料導入装置の洗浄方法 Download PDFInfo
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- WO2012073713A1 WO2012073713A1 PCT/JP2011/076523 JP2011076523W WO2012073713A1 WO 2012073713 A1 WO2012073713 A1 WO 2012073713A1 JP 2011076523 W JP2011076523 W JP 2011076523W WO 2012073713 A1 WO2012073713 A1 WO 2012073713A1
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- Prior art keywords
- sample
- flow path
- needle
- cleaning
- cleaning liquid
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- 239000007788 liquid Substances 0.000 title claims abstract description 141
- 238000004140 cleaning Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims description 31
- 238000003860 storage Methods 0.000 claims abstract description 50
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 63
- 239000007924 injection Substances 0.000 claims description 63
- 238000005406 washing Methods 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 131
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 36
- 238000010586 diagram Methods 0.000 description 24
- 230000007246 mechanism Effects 0.000 description 19
- 230000008569 process Effects 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- LXCFILQKKLGQFO-UHFFFAOYSA-N methylparaben Chemical compound COC(=O)C1=CC=C(O)C=C1 LXCFILQKKLGQFO-UHFFFAOYSA-N 0.000 description 10
- 239000012488 sample solution Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 235000010270 methyl p-hydroxybenzoate Nutrition 0.000 description 5
- 239000004292 methyl p-hydroxybenzoate Substances 0.000 description 5
- 229960002216 methylparaben Drugs 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000006166 lysate Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
-
- 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
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/24—Automatic injection systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1095—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices for supplying the samples to flow-through analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1004—Cleaning sample transfer devices
Definitions
- the present invention relates to a liquid chromatograph, a liquid chromatograph sample introduction device, and a cleaning method for a liquid chromatograph sample introduction device.
- a mobile phase (eluent) is sucked by a pump device, and the mobile phase is sent to a column together with a sample introduced by an automatic sample introduction device.
- the sample introduced into the column is separated into each component and detected by various detectors.
- HPLC high performance liquid chromatograph
- it is required to perform analysis under a high pressure of 20 MPa to 40 MPa at the maximum.
- Such an HPLC pump apparatus is required to be able to supply a mobile phase accurately and precisely even under high pressure.
- the automatic sample introduction device draws the sample liquid from the sample holding container arranged in the sample rack with the needle, stores the sample in the sample storage loop, and automatically injects the sample into the mobile phase channel of the liquid chromatograph. It is a device for doing.
- an automatic sample introduction apparatus having a pretreatment function such as diluting a sample before injecting into the mobile phase flow path or mixing and labeling the sample and the reaction reagent is often used.
- the injection method in such an automatic sample introduction device includes a direct injection method in which a needle and a sample storage loop are incorporated into a part of a mobile phase channel under high pressure (for example, see Patent Document 1 and Patent Document 2), Only the sample storage loop is roughly divided into two types, a loop injection method (see, for example, Patent Document 3 and Patent Document 4) incorporated into a part of the mobile phase flow path under high pressure.
- the sample temporarily stored in the needle and sample storage loop is pushed to the column by the mobile phase at the start of analysis, and the inside of the needle and sample storage loop is always flushed by the mobile phase during analysis. Therefore, there is an advantage that the sucked sample can be introduced into the column without waste, and another means for cleaning the inside of the needle contaminated with the sample is not required.
- the needle in the loop injection method, since the needle is outside the mobile phase flow path under high pressure during the analysis, the needle can be moved and the sample can be measured even during the analysis. Since a structure for maintaining liquid tightness between the inlet and the inlet is unnecessary, there is an advantage that sample pretreatment can be performed during analysis. On the other hand, since another means for cleaning the inside of the needle and its process are required, there is a disadvantage that the time required for sample injection becomes longer than that in the direct injection method.
- the cleaning liquid itself does not hold strongly in the column and reaches the detector in a state of being almost passed.
- the difference of the light absorption is detected with a detector, and is recorded on a chromatogram. This ghost peak due to the cleaning liquid becomes a problem particularly when a very small amount of sample is analyzed with high sensitivity.
- the dilution of the sample solution is promoted in the above-described sample introduction process,
- the sample lysate has a wider bandwidth and is stored in the sample storage loop.
- the peak width of the chromatogram of the sample component detected by the detector is also widened. That is, there is a problem that the analysis time becomes longer because the resolution of the target component is deteriorated, and the processing capability as a chromatographic apparatus is lowered.
- the peak height of the chromatogram of the sample component is also reduced, there is a problem that the sensitivity as a liquid chromatograph is also lowered.
- An object of the present invention is to provide a liquid chromatograph, a liquid chromatograph sample introduction device, which can prevent detection of a ghost peak and improve the resolution of a chromatogram, thereby preventing a long analysis time. And a method for cleaning a liquid chromatograph sample introduction device.
- the present invention provides a first flow path switching means that has a sample storage loop and switches whether the sample storage loop is connected to the mobile phase flow path or disconnected from the mobile phase flow path.
- a needle that sucks and discharges the sample
- a measuring means that measures the sample by sucking and discharging the sample to the needle
- a cleaning liquid feeding means that sends the cleaning liquid
- a second that switches between at least two types of cleaning liquids
- the flow path switching means, the third flow path switching means for switching the connection between the needle and the metering means, and the connection between the needle and the cleaning liquid feeding means, the first flow path switching means, Control means for controlling the operation of the weighing means, the cleaning liquid feeding means, the second flow path switching means, and the third flow path switching means.
- the present invention is configured to inject the entire amount of the sample into the sample storage loop and inject the cleaning liquid into the flow path from the sample storage loop to the sample injection port.
- the detection of a ghost peak is prevented and the resolution of the chromatogram is improved, so that the liquid chromatograph, the liquid chromatograph sample introducing device, which can prevent the analysis time from being increased with high sensitivity, And a method for cleaning a liquid chromatograph sample introduction apparatus.
- FIG. 1 is a schematic configuration diagram of a liquid chromatograph apparatus using a loop injection type automatic sample introduction apparatus which is an embodiment of the present invention.
- the sample holding container 1 is installed on the sample rack 14.
- the needle 2 is moved between the sample holding container 1, the washing tank 10, and the sample injection port 3 of the 6-port 2-position injection valve 8 by a needle moving mechanism (not shown).
- the 6-port 2-position injection valve 8 has six ports and a flow path that communicates two adjacent ports among them, and in the injection position, as shown in the figure, the port P1 Port P6, port P2 and port P3, and port P4 and port P5. Further, the pump device 7 is connected to the port P1, the column 6 is connected to the port P2, the sample storage loop 5 is connected between the ports P3 and P6, the sample inlet 3 is connected to the port P4, and the drain 22 for discharging the waste liquid is connected to the port P5.
- the column 6 is connected to the detector 30 by piping, and the detector 30 detects the separated sample supplied from the column 6 and sends a detection signal to a data processing device (not shown).
- the 6-port 2-position injection valve 8 can take another position by rotating 60 degrees.
- port P1 and port P2, port P3 and port P4, and port P5 and port P6 communicate with each other.
- the pump device 7, the port P1, the port P2, and the column 6 are communicated in this order, and the mobile phase flows to the column without being injected into the mobile phase sent from the pump device 7.
- the needle 2, the sample inlet 3, the port P4, the port P3, the sample storage loop 5, the port P6, the port P5, and the drain 22 are communicated in this order, and the sample sucked by the needle 2 from the sample holding container 1 is sample injected. It is injected from the inlet 3 and the sample storage loop 5 is filled with the sample.
- the sample held in the sample storage loop 5 is pushed into the column 6 by the mobile phase sent from the pump device 7. Further, in order to clean the needle 2 when the sample is changed, the needle 2 is positioned in the cleaning tank 10, and the cleaning liquid is allowed to flow from the cleaning pump device 15 to the needle 2 via the syringe valve 16. In addition, the injection valve 8 is cleaned by positioning the needle 2 to the sample inlet 3.
- the cleaning pump device 15, the syringe valve 16, the plunger cleaning flow path 17, the three-way valve 18, the cleaning liquid container 20, the cleaning liquid container 21, the degassing device 24, and the degassing device 25 are collectively referred to as a cleaning unit.
- the five-port four-position syringe valve 16 has five ports, and four types of passages indicated by solid lines and broken lines in the figure are provided to communicate between the two ports.
- the port P1 communicates with the washing tank 10, the port P2 communicates with the needle 2, the port P3 communicates with the syringe 11 for measuring the sample, and the port P4 communicates with the plunger washing flow path 17 for washing the plunger of the pump device 7.
- the port P5 communicates with the cleaning pump device 15. Then, four positions can be taken by rotating 45 degrees. In the first position, the port P5 communicates with the port P1, and the port P2 communicates with the port P3. In the second position, port P5 communicates with port P2, and port P3 communicates with port P4. The third position is indicated by a solid line in the figure, and only the port P5 and the port P3 communicate with each other. In the fourth position, only the port P5 and the port P4 communicate.
- the cleaning liquid A is held in the cleaning liquid container 20 and the cleaning liquid B is held in the cleaning liquid container 21, and the cleaning liquid A or the cleaning liquid B is selected by the three-way valve 18 via the degassing devices 24 and 25.
- the salt contained in the mobile phase deposited on the plunger surface of the pump device 7 can be washed by communicating the plunger cleaning channel 17 and the pump device 7.
- the needle 2 When the syringe valve 16 is in a position where the ports P1 and P5 and the ports P2 and P3 communicate with each other, the needle 2 is connected to the syringe 11 for measuring the sample via the buffer tube 13, and the syringe 11 By operating up and down, the liquid in the pipe from the needle 2 to the syringe 11 is sucked and discharged.
- FIG. 2 is a functional diagram showing a control target of the operation control unit 201 that controls a mechanism for operating a valve or the like of the liquid chromatograph apparatus.
- the operation control unit 201 includes a processor that executes a control program stored in a memory (not shown) in advance, and includes a needle moving mechanism 202, a syringe operating mechanism 203, a cleaning unit operating mechanism 204, a syringe valve operating mechanism 205, and a three-way valve operating mechanism.
- an operation command is sent to the injection valve operation mechanism 207.
- the movement and suction / discharge operation of the syringe 11 are controlled by the syringe operation mechanism 203.
- the cleaning unit is operated by the cleaning unit operation mechanism 204.
- the syringe valve 16 is operated by a syringe valve operating mechanism 205.
- the three-way valve 18 is operated by a three-way valve operating mechanism 206.
- the injection valve 8 is operated by an injection valve operating mechanism 207.
- the loop injection method in the present embodiment is also referred to as a total injection method because the entire amount of the sample sucked from the needle 2 is sent to the sample storage loop 5 of the injection valve 8 and reaches the column 6 for separating the sample.
- the following terms are arranged.
- vi injection volume, net sample introduction amount into mobile phase flow path.
- vf Feed volume.
- vd Dead volume, from sample inlet to injection valve.
- va Air volume, the volume of the air layer before and after the sample.
- the setting of whether to sandwich va before and after the sample can be selected by an automatic sample introduction apparatus.
- FIG. 1 above shows a flow path in which the automatic sample introduction apparatus is initialized and is in an idle state.
- a mobile phase in which no sample is injected flows from the pump device 7 to the column 6 through the sample storage loop 5 of the injection valve 8.
- the cleaning liquid container 20 that holds the cleaning liquid A is connected to the syringe 11 via the three-way valve 18, the cleaning pump device 15, and the port P 3 that communicates with the port P 5 of the syringe valve 16. It has been washed.
- the needle 2 is positioned above the cleaning tank 10 so that the liquid dripped from the needle 2 is received by the cleaning tank 10.
- FIG. 3 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1 and shows a state in which the inside of the buffer tube 13 and the needle 2 is replaced with the cleaning liquid B held in the cleaning liquid container 21 and is cleaned.
- the needle 2 is moved to the sample injection port 3 and communicated with the port P4 of the injection valve 8.
- the syringe valve 16 is rotated 45 degrees clockwise with respect to the state shown in FIG. 1 so as to connect the port P5 and the port P2 and to switch to the position where the port P3 and the port P4 are communicated.
- the three-way valve 18 is switched to the cleaning liquid container 21 that holds the cleaning liquid B.
- the cleaning liquid B is sent to the syringe valve 16, the buffer tube 13, the needle 2 and the injection valve 8 by the cleaning pump device 15, and the inside of the port P 5 communicating with the port P 4 of the injection valve 8 is also cleaned, and the cleaning liquid B is discharged from the drain 22. Is done.
- FIG. 4 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a state in which the outside of the needle 2 is cleaned with the cleaning liquid A in the cleaning tank 10.
- the position of the port of the injection valve 8 is not changed, and the syringe valve 16 is rotated 45 degrees clockwise relative to the state of FIG. 3 so that the port P5 and the port P1 communicate with each other, and the port P2 and the port P3 are connected. Switch to the position to communicate.
- the cleaning liquid A in the cleaning liquid container 20 is sent to the cleaning tank 10 via the syringe valve 16 by the cleaning pump device 15, the needle 2 is immersed in the cleaning liquid A in the cleaning tank 10, sucked by the syringe 11, and the syringe valve 16 or needle 2 is filled with the cleaning liquid A.
- the amount of suction is vf + vd, that is, the sum of the feed volume and dead volume. Further, the outside of the needle 2 is washed by immersing the needle 2 in the washing tank 10.
- FIG. 5 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a step of sucking a sample.
- the needle 2 is moved from the washing tank 10 to the sample holding container 1 without changing the positions of the ports of the syringe valve 16 and the injection valve 8, but air is moved by the syringe 11 during the movement. To suck. The suction amount is half of the air volume va.
- the needle 2 is moved to the sample holding container 1 and the sample is sucked by the syringe 11.
- the suction amount is the injection volume vi.
- FIG. 6 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a state in which the outside of the needle 2 is washed with the washing liquid A after the sample is sucked.
- the needle 2 is moved from the sample holding container 1 to the washing tank 10 without changing the positions of the ports of the syringe valve 16 and the injection valve 8. Air is sucked in half of va.
- the cleaning liquid A is sent to the cleaning tank 10 by the cleaning pump device 15 to clean the outside of the needle 2.
- the cleaning liquid A that has overflowed in the cleaning tank 10 is discharged from the drain 23.
- FIG. 7 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a state where the needle 2 is moved to the sample inlet 3 of the injection valve 8. As shown in FIG. 7, without changing the positions of the ports of the syringe valve 16 and the injection valve 8, the needle 2 is moved to the sample injection port 3 of the injection valve 8, and preparation for injecting the sample from the port P4 to the injection valve 8 is performed. do.
- FIG. 8 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a state in which the pressure in the sample storage loop 5 is released.
- the inside of the sample storage loop 5 is connected to the pump device 7 and forms a mobile phase flow path, so that the pressure is higher than the atmospheric pressure.
- the position of the port of the syringe valve 16 is not changed, the injection valve 8 is rotated 60 degrees counterclockwise, and the sample storage loop 5 of the injection valve 8 is removed from the mobile phase flow path of the pump device 7.
- the pressure in the sample storage loop 5 is released from the drain 22 to atmospheric pressure by disconnecting and disconnecting the sample storage loop 5 under high pressure from the mobile phase flow path.
- FIG. 9 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a process of sending the sample sucked by the needle 2 to the injection valve 8.
- the sample inside the needle 2 is pushed from the port P4 of the injection valve 8 by pushing out the cleaning liquid A and the air in the syringe 11 without changing the positions of the ports of the syringe valve 16 and the injection valve 8. It is sent to the sample storage loop 5 inside the injection valve 8.
- the amount pushed out by the syringe 11 is an amount vf + vi + vd + va that is a sum of the feed volume, the injection volume, the dead volume, and the air volume.
- the cleaning liquid A of volume vf sucked in the step of FIG. 4 is sent to the injection valve 8, so that the entire amount of the sample is passed through the sample storage loop 5. Can be satisfied.
- FIG. 10 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a process of introducing the sample held in the sample storage loop 5 into the mobile phase flow path.
- the injection valve 8 is rotated clockwise by 60 degrees, and the port P 3 of the sample storage loop 5 is connected to the port P 2 connected to the column 6.
- the port P6 of the sample storage loop 5 is communicated with the port P1 connected to the pump device 7, and the mobile device flows to the sample storage loop 5 by the pump device 7 and is sent to the column 6 together with the sample.
- the syringe 11 is moved to the top dead center, and the liquid in which the cleaning liquid A in the needle 2 and the remainder of the sample are mixed is supplied from the sample injection port 3 to the ports P4 and P5 of the injection valve 8. To the drain 22.
- FIG. 11 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1, and shows a process of cleaning the inside of the needle 2 with the cleaning liquid A.
- the syringe valve 16 is rotated 45 degrees counterclockwise to switch to a position where the ports P5 and P2, and the ports P3 and P4 communicate with each other.
- the cleaning liquid A held in the cleaning liquid container 20 by the cleaning pump device 15 is sent to the needle 2 via the syringe valve 16 and the inside of the needle 2 is cleaned with the cleaning liquid A.
- the cleaning liquid A is discharged from the drain 22.
- the syringe valve 16 After completion of the cleaning of the needle 2 shown in FIG. 11, the syringe valve 16 is rotated 45 degrees counterclockwise, and the port P5 and the port P3 of the syringe valve 16 are communicated to shift to the idle state shown in FIG. . Further, the needle 2 is moved above the cleaning tank 10.
- FIG. 12 is a schematic configuration diagram of the liquid chromatograph apparatus as in FIG. 1 and is executed after the cleaning of the needle 2 shown in FIG. 10 when the cleaning of the plunger of the pump device 7 is set in advance. It is a process.
- the syringe valve 16 is rotated 90 degrees counterclockwise to switch to a position where the port P5 and the port P4 communicate with each other.
- the three-way valve 18 is switched and connected to the cleaning liquid container 21, the cleaning liquid B is sucked by the cleaning pump device 15, and the pump device 7 (not shown) is drawn from the plunger cleaning channel 17.
- the cleaning time is set in advance, and when completed, the syringe valve 16 is rotated 45 degrees clockwise to shift to the idle state shown in FIG.
- FIGS. 13A, 13B, 14A, and 14B are graphs showing examples of chromatograms.
- FIG. 13A shows the result of the conventional apparatus configuration
- FIG. 13B shows the result of the apparatus configuration of the present invention.
- the analysis conditions are: 60 ppm methyl paraben for the sample, methanol for the sample solution, 60% aqueous methanol solution for the mobile phase, methanol for the cleaning solution A, 60% aqueous methanol solution for the cleaning solution B, the flow rate of the mobile phase is 1 ml / min, and the column is ODS.
- FIG. 13A is a chromatogram when the step shown in FIG. 3 is not carried out
- FIG. 13B is a chromatogram when the step shown in FIG. 3 is carried out
- the chromatogram shown in FIG. Before this peak, a ghost peak caused by the washing solution A methanol, which is caused by the difference in absorbance between the 60% aqueous methanol solution and the washing solution A methanol, is detected.
- FIG. 13B in the process shown in FIG. 3, the inside of the pipe including the buffer tube 13 and the needle 2 is replaced with a 60% methanol aqueous solution of the cleaning liquid B, so that the chromatogram shown in FIG. The ghost peak is completely gone.
- FIG. 14A shows the result of the conventional apparatus configuration
- FIG. 14B shows the result of the apparatus configuration of the present invention.
- the analysis conditions are: 60 ppm methyl paraben for the sample, 60% methanol aqueous solution for the sample solution, 60% methanol aqueous solution for the mobile phase, 60% methanol aqueous solution for the cleaning solution, distilled water for the cleaning solution B, and 1 ml / min of the mobile phase flow rate.
- the column is ODS, the dimensions are 4.6 mm ID ⁇ 150 mm L, the particle size is 5 ⁇ m, the column temperature is 40 ° C., the absorbance detection wavelength is 265 nm, and the injection volume is 10 microliters.
- 14A is a chromatogram when the process shown in FIG.
- FIG. 14B is a chromatogram when the process shown in FIG. 3 is performed.
- the sample solution is easily dissolved in the 60% methanol solution of the cleaning solution A, it is diluted in the sample introduction process and reaches the column with a wide bandwidth in the analysis flow path. As a result, it is detected by the detector.
- the peak width of methyl paraben is widened.
- the peak height of methyl paraben is also decreased.
- the chromatogram of FIG. 14B in which the process shown in FIG. 3 is performed the inside of the pipe including the buffer tube 13 and the needle 2 is replaced with the cleaning liquid B distilled water, so that the peak width of methyl paraben is narrowed. In addition, the peak height is also increased by about 17%, and high sensitivity of the liquid chromatograph is obtained.
- the cleaning solution is added to the actual sample solution.
- the sample is stored in the sample storage loop.
- high sensitivity can be obtained without degrading the resolution of the chromatogram or by improving the resolution.
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Abstract
Description
本発明の他の目的、特徴及び利点は添付図面に関する以下の本発明の実施例の記載から明らかになるであろう。
図1は、本発明の実施例であるループインジェクション方式の自動試料導入装置を用いた液体クロマトグラフ装置の概略構成図である。試料保持容器1はサンプルラック14上に設置される。ニードル2は、試料保持容器1と、洗浄槽10と、6ポート2ポジションのインジェクションバルブ8の試料注入口3との間を、図示しないニードル移動機構により移動される。
vf:フィードボリューム。
vd:デッドボリューム、試料注入口からインジェクションバルブまで。
va:エアボリューム、試料前後の空気層の容積である。
ここで、vaを試料前後に挟むか否かの設定は、自動試料導入装置によって選択することが可能である。
上記記載は実施例についてなされたが、本発明はそれに限らず、本発明の精神と添付の請求の範囲の範囲内で種々の変更および修正をすることができることは当業者に明らかである。
2 ニードル
3 試料注入口
5 試料貯留ループ
6 カラム
7 ポンプ装置
8 インジェクションバルブ
10 洗浄槽
11 シリンジ
13 バッファチューブ
14 サンプルラック
15 洗浄ポンプ装置
16 シリンジバルブ
17 プランジャ洗浄流路
18 三方バルブ
20,21 洗浄液容器
22,23 ドレイン
24,25 脱気装置
201 動作制御部
202 ニードル移動機構
203 シリンジ動作機構
204 洗浄ユニット動作機構
205 シリンジバルブ動作機構
206 三方バルブ動作機構
207 インジェクションバルブ動作機構
Claims (9)
- 試料貯留ループを有し、該試料貯留ループを移動相の流路に接続するか切り離すかを切り替える第1の流路切り替え手段と、
試料を吸引し吐出するニードルと、
前記ニードルへの前記試料の吸引と吐出とを該試料を計量して行う計量手段と、
洗浄液を送る洗浄液送り手段と、
前記洗浄液は少なくとも二種であり、該少なくとも二種の洗浄液を切り替える第2の流路切り替え手段と、
前記ニードルと前記計量手段との接続、および前記ニードルと前記洗浄液送り手段との接続を切り替える第3の流路切り替え手段と、
前記第1の流路切り替え手段、前記計量手段、前記洗浄液送り手段、前記第2の流路切り替え手段、前記第3の流路切り替え手段の動作を制御する制御手段とを備えることを特徴とする液体クロマトグラフ。 - 請求項1の液体クロマトグラフにおいて、前記第1の流路切り替え手段が前記ニードルに接続される試料注入口を有し、前記試料貯留ループに前記試料の全量が注入されるとともに前記試料貯留ループから前記試料注入口までの流路に前記少なくとも二種の洗浄液の一方が注入されることを特徴とする液体クロマトグラフ。
- 請求項2の液体クロマトグラフにおいて、前記ニードルが、前記第1の流路切り替え手段の前記試料貯留ループから前記試料注入口までの流路に注入される前記洗浄液とは異なる洗浄液で洗浄されることを特徴とする液体クロマトグラフ。
- 請求項1の液体クロマトグラフにおいて、前記ニードルが、前記移動相と同じ成分の洗浄液で洗浄されることを特徴とする液体クロマトグラフ。
- 請求項1の液体クロマトグラフにおいて、前記ニードルが、前記移動相と異なる成分の洗浄液で洗浄されることを特徴とする液体クロマトグラフ。
- 移動相流路に注入された試料を分離して成分を検出する液体クロマトグラフに用いられる液体クロマトグラフ用試料導入装置において、
試料貯留ループを有し、該試料貯留ループを前記移動相流路に接続するか切り離すかを切り替える第1の流路切り替え手段と、
前記試料を吸引し吐出するニードルと、
前記ニードルへの前記試料の吸引と吐出とを前記試料を計量して行う計量手段と、
洗浄液を送る洗浄液送り手段と、
前記洗浄液は少なくとも二種であり、該少なくとも二種の洗浄液を切り替える第2の流路切り替え手段と、
前記ニードルと前記計量手段との接続と、前記ニードルと前記洗浄液送り手段との接続とを切り替える第3の流路切り替え手段と、
前記第1の流路切り替え手段、前記計量手段、前記洗浄液送り手段、前記第2の流路切り替え手段、および前記第3の流路切り替え手段の動作を制御する制御手段と
を備えたことを特徴とする液体クロマトグラフ用試料導入装置。 - 請求項6の液体クロマトグラフ用試料導入装置において、前記第1の流路切り替え手段は試料注入ポートを有し、前記試料貯留ループを前記移動相流路に接続するか前記試料注入ポートに接続するかを切り替えることを特徴とする液体クロマトグラフ用試料導入装置。
- 請求項6の液体クロマトグラフ用試料導入装置において、前記試料貯留ループに接続され、該試料貯留ループ内に貯留された試料を該試料貯留ループから排出させるポンプ手段をさらに備えることを特徴とする液体クロマトグラフ用試料導入装置。
- 移動相の流路に注入された試料を分離して成分を検出する液体クロマトグラフに用いられる液体クロマトグラフ用試料導入装置の洗浄方法において、
洗浄液は第1の洗浄液と第2の洗浄液とを有しており、
試料容器から前記試料を吸引し吐出するニードルに前記第1の洗浄液を送って該ニードルの内側を洗浄する工程と、
前記ニードルを洗浄槽に浸漬して該ニードルの外側を洗浄する工程と、
前記試料を計量しながら前記ニードル内に該試料を吸引する工程と、
前記ニードル内に吸引した前記試料を第1の流路切り替え手段の試料貯留ループに供給する工程と、
前記試料貯留ループに貯留された前記試料を前記移動相の流路に供給する工程と、
前記ニードルの内側を前記第2の洗浄液で洗浄する工程と
を備えることを特徴とする液体クロマトグラフ用試料導入装置の洗浄方法。
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