EP0738000B1 - Zwischenspeicherung von Ionen für massenspektrometrische Untersuchungen - Google Patents
Zwischenspeicherung von Ionen für massenspektrometrische Untersuchungen Download PDFInfo
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- EP0738000B1 EP0738000B1 EP95114449A EP95114449A EP0738000B1 EP 0738000 B1 EP0738000 B1 EP 0738000B1 EP 95114449 A EP95114449 A EP 95114449A EP 95114449 A EP95114449 A EP 95114449A EP 0738000 B1 EP0738000 B1 EP 0738000B1
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- ions
- ion
- substance
- intermediate store
- batches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/426—Methods for controlling ions
- H01J49/4295—Storage methods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/06—Electron- or ion-optical arrangements
- H01J49/062—Ion guides
Definitions
- the invention relates to methods and devices for the intermediate storage of Ions to be subjected to a mass spectrometric analysis.
- Such an intermediate storage of ions in a high-frequency multipole rod system for their analysis in a high-frequency quadrupole ion trap is over US 5 179 278 known.
- the invention consists in the known buffering for such To use ions that are supplied in an ion source from separate times Thrusts of individual substances or mixtures of substances can be obtained.
- the Buffer stores enough ions of one batch of substance for several subsequent mass spectrometric studies, so that a mass spectrometric Characterization of substances, which are also different Measurement methods may require, is made possible to the desired extent.
- ions should be separated from electrophoretically or chromatographically Flushes of substance can be temporarily stored until the mass spectrometric Examinations to the desired extent completed are.
- Multiple buffers can store the ions from several rapidly consecutive ones Pick up flare-ups. But also short-term flare-ups Laser-desorptive or pyrolytic processes can be stored temporarily to be examined in detail.
- Mass spectrometric measurement methods on the ever shorter batches of substances adapt to modern substance separation processes. Separation process like Capillary electrophoresis and liquid chromatography with microcapillary columns are becoming faster and faster procedures for the sake of saving time developed. Today they deliver the separated substances in batches that only still take a few 10 to 100 milliseconds. Mass spectrometry is straight still able to get single overview spectra of the substances from the substance batches to deliver.
- the method for measuring the fragment ions is selected Primary ions (or parent ions), for which the primary ion spectrum is first must be included, from which only the parent ions are determined. It gets even more complicated when recording grandchildren spectra on selected ones Daughter ions.
- the substances from the substance spurts with one-time supply, i.e. lowest consumption of substances as comprehensive as possible using the mass spectrometric examination methods that are possible today like low-resolution mass spectra, high-resolution mass spectra, Neutral loss spectra, daughter ion spectra (MS / MS) of selected parent ions or even characterize grandchildren spectra (MS / MS / MS) of selected daughters to be able to.
- the types of desirable exams can even be be be expanded significantly when reactant gases are added and the resulting ones Product ions, in turn, can be analyzed by the various methods It is possible to make statements about the folding structures of complicated molecules.
- a method and a device can be found with which substances from a or several successive batches of substances in modern substance delivery systems in many different ways with different types of mass spectrometry Examination methods as extensively as possible for different properties can be examined without the addition of substances while increasing substance consumption and extending the duration of the analysis having to repeat several times.
- the "flare-ups" are characterized by the short period in which the Ions of a substance are available for measurements, the brevity of Time can be seen relative to the total time of the measurements.
- the delivery systems can be, for example, electrophoretic or chromatographic separation systems, but also around laser desorption Surfaces to deal with rapid pyrolysis processes or other processes where flare-ups are generated. It should be possible to use the substances separated from individual batches, or several batches summarized, to be examined in detail from different points of view.
- the present object is achieved with a method according to claim 1 and a device according to claim 13.
- the buffer store should therefore contain as many ions of a substance surge Feeding system can accommodate that in successive mass spectrometric Investigations of these ions from the buffer with various methods a desired characterization of the test substance is made possible. Only a subset is used for each examination of the ions taken from the buffer.
- the invention is therefore primarily used by these new types of ionization.
- this invention is expressly not intended to be limited only to these types of ionization can be limited. Even with the usual types of ionization, for example when analyzing the mixture with electron impact and MS / MS, there are large ones Benefits from this invention.
- mass spectrometric principles can be used for the investigations are used, such as high-frequency quadrupole ion traps, ICR mass spectrometer, or tandem mass spectrometer various Species such as the triple quadrupole mass spectrometer ("Triple Quad ").
- the test ions (“parent ions ”) are in tandem mass spectrometers filtered out when flying through a first mass spectrometer, in one Collision cell fragmented and ionized in a second mass spectrometer Fragments ("daughter ions”) analyzed.
- high-frequency quadrupole as well as in ICR ion traps will take these steps in succession in the same memory cell explained, which is why one also calls “temporal tandem mass spectrometry” ("tandem in time”) speaks.
- the batches of substances can be batches of cleanly separated individual substances act from physico-chemical separation processes, as well Relapses of mixtures of substances with many individual substances, such as in pyrolytic decomposition processes carried out in pulsed fashion or by laser pulses desorbing surface analyzes become free. Also ions from matrix-supported Laser desorption (MALDI), especially after two-dimensional separation by gel electrophoresis belong to this group of delivery systems Flare-ups.
- MALDI matrix-supported Laser desorption
- the separation process can after filling the store with ions can be switched off when a next one Substance thrust approaches before the previous substance is fully examined.
- Either electrophoretic as well as liquid chromatographic methods can be interrupted without the quality of the separation deteriorating significantly becomes.
- the gas chromatographic separation can also be interrupted, but here the subsequent separation suffers from poorer substance separation since the Substances in the carrier gas can diffuse much more easily, and switching off the Carrier gas flow drastically changes the pressure and volume ratios each time.
- the separation is already in the analysis completed, the substance batches are done by feeding the carrier plates generated with respect to the scanning beam of the laser.
- the buffer in US 5 179 278 works as a through memory, the current one
- the invention is expressly not intended to be limited only to these.
- Pass-through memory but form the simplest type of temporary storage. They have an input defined as such for the ions to be stored, and a normally opposite exit through which the ions pass Leave memory.
- the drive of the ions within the buffer towards the ion exit can be realized in different ways. This is the case with all buffers possible to generate a weak direct electric field along the axis, which drives the ions towards the exit, where they are in the desired state during the storage phase Way prevented by the switchable reflection potential from the outflow and so saved.
- a constant field can be generated by adding all the rods, in addition to supply them with a high-frequency voltage, in the same direction as one Direct current can be flowed through. It is advantageous to make the rods from one To manufacture resistance material.
- a generation of an axial co-field component in ring systems or in double helix memories is described in German Patent Application No. 195 23 859.1.
- This disadvantage has the Registration described as a double or multiple helix trained memory, if the turns of the helices also in the further keep the open area of the cone the same distance.
- the double helix and their higher descendants such as four-fold helix or six-fold helix are therefore suitable in a particularly good way as a buffer.
- the outflow of ions from the intermediate storage is done by opening the reflector allows at the end of the buffer. It’s cheap here switching lenses insert the outflowing ions from a small area of the buffer aspirate and into the next stage of processing these ions can focus.
- the small intake area of the switching lens is due to the Afterflow of ions is refilled, especially when the ions are propelled subject to exit.
- the outflow rate is therefore of the ions only from the ion density in the buffer, i.e. from the degree of filling, dependent.
- This relationship can be determined experimentally and for example used to fill ion traps in successive fillings always steer straight up to the space charge limit, or even through Changing the lens voltage to produce a steady outflow as he did for a subsequent tandem mass spectrometer.
- the selective filling of an ion trap with selected parent ions up to can be controlled close to the space charge limit. It will be during the filling, in a known manner, the ions are usually filtered by the irradiation of a frequency mixture that the unwanted ions from the ion trap drives, but leaves the desired in it. From the primary ion spectrum the ratio of the selected parent ions to the total charge is known, and from the known filling speed and the known efficiency of Filtration can control the filling up to the optimal filling level.
- Figure 1 shows a block diagram of a mass spectrometer with two buffers according to this invention.
- a substance delivery system carries substances incrementally to an ion source, which in this example is in the vacuum system of the mass spectrometer.
- batch feeder systems come, for example, all chromatographic and electrophoretic Separation processes, but also pyrolytic or laser desorptive processes.
- the ions from the substance batches can be stored in the two buffers 1 and 2 must be kept.
- the ions of the intermediate storage 2 are added in portions examined in the mass spectrometer until sufficient characterization of the substances of the substance boost is reached, or the ions are used up are.
- the buffers can be dimensioned so that they ionize for a large number of subsequent mass spectrometric examinations be able to record. Space charge limits play with buffers only a subordinate role.
- FIG. 2 shows such a buffer, which is designed here as a double helix (4) is.
- the double helix (4) is located between the lens system (1, 2, 3) at the entrance of the buffer and the lens system (7, 8, 9) at the output of the buffer.
- the diaphragms (3) and (7) there is a potential that the ions drives back into the double helix.
- the high frequency voltage for storage is supplied via connections (5) and (6). By switching the potential at the lens aperture (8), the ions can be sucked out of the buffer and fed to a subsequent system.
- Figure 3 shows a special type of reflection of the stored ions at the end the double helix, shown here as an HF-supplied double spiral on an insulating one Carrier (7a).
- the carrier (7a) replaces the potential aperture (7) of the output lens in Figure 2.
- the double spiral is supplied by the same high frequency voltage like the double helix (4).
- the double spiral on the carrier (7a) has opposite a metallic conductive potential diaphragm (7) the advantage of a much smaller one Range of reflective pseudo-potential so that more ions are stored can be, and the removal of the ions from the buffer faster takes place.
- Figure 4 shows an arrangement of a mass spectrometer with three buffers again as a schematic diagram, the individual functional units being only symbolic, and the electrical and vacuum supply units not at all are shown.
- the ion source is located here - unlike in the block diagram of Figure 1 - outside the vacuum system of the mass spectrometer.
- the batch The substances are supplied by a chromatographic or electrophoretic Capillary column separation device taken over, here only symbolically the separation capillary (10) is shown.
- the substances are initially in a Detection unit (11) detects, for example, a UV absorption unit can, and then fed to the needle (12) of an electrospray ion source.
- a strong stream of ambient gas is sucked through the inlet capillary (13) into the vacuum chamber (14), which is pumped via the nozzle (25).
- Some of the ions are viscously entrained in this stream.
- the gas flow expands adiabatically in the chamber (14) of the first differential pump stage, the entrained ions being accelerated to speeds of approximately 1000 meters per second.
- Some of the ions can leave the vacuum chamber (14) through the fine opening in the scraper (15) and enter the vacuum chamber (17) of the next differential pump stage, which is pumped through the nozzle (26).
- the ions enter the buffer (16).
- the ions are captured in this buffer (16) and remain there until their kinetic energies have thermalized, which takes only a few 10 milliseconds at the prevailing pressure of about 10 -2 millibars.
- the thermalized ions of the first batch of substances are then stored in the buffer (18) in the buffer (20) and stored there again.
- the ions are portionwise extracted from this storage into the high-frequency quadrupole ion trap mass spectrometer shown transferred and there analyzed.
- the ion trap consists of the two end cap electrodes (21) and (23), and the ring electrode (24).
- the ions become mass-selective in the analysis processes ejected from the ion trap through the end cap (23) and in the ion detector (24) measured.
- Figure 5 shows a diagram of the separation of substances in a separation system.
- the substances (a) to (i), which are separated in time, are called substance spurts of the ion source fed and ionized.
- a mass spectrometer according to FIG three buffers used, so the ions of the rapidly successive Flare-ups (a), (b) and (c) in the last (20), penultimate (18), and third last Buffer (16) brought and stored there.
- the ions of the Flare-ups (a), (b) and (c) can then be analyzed before flare-up (d) arrives, the ions of which are therefore stored again in the last intermediate store (20) can be.
- substance surge (e) arrives, the ions of (d) already analyzed.
- the embodiment described here relates to the coupling of an ion trap mass spectrometer with the separation method of capillary electrophoresis, as they are in particular can be used for the separation of proteins.
- the ionization is done by electrospraying at atmospheric pressure, which causes the in the electrolyte Proteins dissolved in electrophoresis are fragmentation-free with practically complete Allow yield to ionize.
- Such an arrangement with three buffers is reproduced as a schematic diagram in Figure 4. Every specialist becomes a sketch create the arrangement of the mostly commercially available functional elements can.
- This embodiment is particularly cheap in that it is the very fast one Capillary electrophoresis with its very short bursts of substance with one Coupling type of mass spectrometry, which can be varied in a variety of ways, including the acquisition of daughter and grandchildren spectra, and inclusive the activation of ion-molecule reactions with any reactant gases and analysis of the product ions.
- these types of studies need their time, especially if there are several such procedures in a row with reverse control should take place from the results of the previous analyzes, and were up to Can not be coupled with fast separation methods to this invention at all, even if very few substances were separated in the separation process.
- the basic sketch in FIG. 4 gives the capillary electrophoresis only symbolically by the Capillary column (10) again.
- the substance flow is detected at the end of the capillary column, to determine the flare-ups.
- the detection can, for example, by a commercial UV absorption unit (11) happen within the capillary.
- the capillary column ends in an electrospray needle (12). Between these electrically conductive needle (12) and the end face of the input capillary (13) is an electrospray voltage applied by a few kilovolts. That at the top of the Needle highly inhomogeneous electric field pulls a practically continuous Stream of tiny droplets from the electrophoresis liquid. It is there expedient to coaxially surround the electrospray needle with a second needle which can balance the liquid flows, because electrophoresis provides an electroosmotic liquid propulsion that is very small and even in the electrospray needle can be directed into it while the electrophoretic migrating test substances out of the needle. The tiny ones Liquid droplets are highly electrically charged and evaporate quickly, whereby usually the large substance molecules in a mechanism that is not yet fully understood stay charged.
- the charged droplets and the charged molecules are in the electric field moved towards the end face of the input capillary (13), creating an equilibrium from the tensile force of the electric field and braking force in the surrounding gas.
- This process is known as "ion mobility”.
- a warmed clean gas mostly nitrogen, is added to promote the evaporation process and not to let the liquid vapor get into the vacuum.
- This chamber (17) is kept at a pressure of a few 10 -2 millibars by means of a turbomolecular pump via connecting pieces (26).
- the ions entering the chamber (17) through the stripper (15) are captured and absorbed by the buffer (16) practically without loss. Due to the relatively high vacuum pressure of a few 10 -2 millibars, their kinetic velocities are thermalized in a few 10 milliseconds. It is therefore expedient to initially take up all the ions of a substance batch in this buffer, to store them there for about 30 milliseconds after the substance batch has ended, and only then to forward them to the next memories (18) or (20).
- the intermediate store (16) consists in the best case of a conically shaped one Double helix, as shown in Figure 2.
- the two connecting wires (5) and (6) The double helix is one with the two phases of the high frequency voltage corresponding HF generator connected. Reflect the inner walls of the double helix the ions in the same way as the inner walls of a high-frequency multipole rod system, but with the double helix, the reflective pseudo-potential by constant spacing of the filaments even in the case of a conical system are kept at the same level, unlike multi-pole rod systems in which the level of the pseudo-potential decreases towards the open end of the cone.
- the Conical shape creates a permanent propulsion of the ions towards the more open end of the cone, this drive is due to a weak pseudo-potential in the axial direction given.
- the buffer (16) is on both sides by reflective electrical potentials locked. At the input to the buffer there is a real potential between Scraper (15) and the center potential of the high-frequency voltage. At the exit can be by a double spiral (7a), as shown in Figure 3, achieve a cheaper deal.
- the double spiral is with the same high frequency voltage connected, which also supplies the double helix, thereby a reflective pseudo-potential that has a much shorter range than a real potential with extensive expansion.
- the double spiral can, for example generated by vapor deposition of a spiral conductor on an insulator become. The insulator can in turn be easily attached to the wall of the chamber (17) be attached.
- the double spiral forms part of a switching lens, which with a central aperture (8) Is provided. If the middle aperture is switched to an ion-repellent potential, so the exit is closed. But if an absorbing potential is created, so the exit is open. The ions from near the lens opening are sucked in, accelerated into the lens, focused, and decelerating into the next buffer (18) has risen.
- Both buffers (18) and (20) are both in the main chamber (19) of the vacuum system by a turbomolecular pump via nozzle (27) is pumped.
- Both buffers (18) and (20) have a structure like that Buffer (16), only the input-side potential difference is not from Scraper (15), but from the last aperture of the previous lens Stage formed.
- the output from the buffer store (20) brings the ions into the ion trap mass spectrometer, that from two end caps (21) and (23) and from the ring electrode (22) exists.
- the function of the ion trap mass spectrometer is discussed here not discussed further since it is known to any relevant specialist. It should but it should be noted that the filling of such an ion trap mass spectrometer is very critical, since the function is above a threshold for the filling quantity of the mass spectrometer is adversely affected by space charge effects. In particular, the mass resolution decreases.
- a batch of electrophoresis contains only 10 femtomoles of a substance, this is 6x10 9 molecules.
- 10 Femtomoles of a substance are extremely little, this small amount is hardly sufficient for UV detection.
- a stain on a gel electrophoresis plate needs at least 100 picomoles to 10 micromoles to be visible after staining, i.e. at least 10,000 times more substance for visual detection.
- the molecules of this 10 femtomol substance are practically completely ionized in the electrospray ion source. If you can now transfer 1/1000 of the ions formed into a buffer in a vacuum, 6x10 6 ions are stored.
- the numbers in the example are still within the limits of what is feasible and can only be achieved today under favorable conditions. However, it is expected that they can be routinely achieved with advancing technology, experience and development. However, a lot more ions can be stored in a buffer than specified in this example. A well-designed buffer stores around 10 9 ions, a good hundred times the example above. Under the favorable conditions indicated above, all ions of a substance burst that corresponds to approximately one picomole of a substance can still be absorbed into the vacuum. With this number of ions, the ion trap can be filled about 2000 times if the filling is carried out without filtering the ions.
- the measuring method can best be based on the substance flow of an electrophoresis chromatogram be described, as shown in Figure 5. It it is assumed that it is a mixture of peptides that consists of an unknown protein was made by cutting with trypsin. This Procedure is widely used in biochemistry and is standard for identification applied by proteins. As soon as a first through the substance detector (12) Substance thrust (a) of this peptide mixture has been determined, the outcome of the first intermediate store (16) is closed so that the ions of the substance surge (a) can be stored in it. Are the ions of the substance surge (a) Completely ingested, about 30 milliseconds are waited to to complete the thermalization, and the ions of this substance boost (a) then forwarded to the last buffer (20) and stored there.
- the ions of the substance boost (b) are stored in the intermediate store (18) and the ions of the substance boost (c) in the intermediate storage (16).
- the buffer (20) simply completely emptied by the high frequency voltage for about 20 milliseconds is switched off.
- the ions from the buffer (18) transferred to the buffer (20) and analyzed from there.
- the ions from the intermediate store (16) are brought into the intermediate store (18), and the buffer (16) again stands for the storage of the ions new substance boosts are available.
- the buffers can hold a very large amount of ions, because at harmful effects of space charge were observed to a very limited extent become.
- the buffer memory is sufficient, as explained above by the numerical example, well for about 2000 unselected fillings of the ion trap, like them for the acquisition of simple mass spectra. On the one hand stands mostly not as much test substance available to use with a Substance boost to really fill the memory.
- the Recording the daughter spectra of selected parent ions only the selected ones Parent ions are stored in the ion trap and the remaining ions are destroyed is the number of daughter spectra (and grandchild spectra) for this filtering storage according to the concentration of the parent ions (or even daughter ions) much less.
- capillary electrophoresis deliver appropriate flare-ups, but also liquid chromatography, especially one with microcolumns. Even gas chromatography can be used in this way it may be favorable for the latter to increase the number of buffers increase.
- the detection of the batches of substances need not be carried out by UV detectors.
- splitting a partial stream can be analyzed in any commercially available detector, to detect the flare-ups.
- the flame ionization detector common in gas chromatography (FID) can be used.
- FID gas chromatography
- it can also be a double ion source be used in the case of a partial ion flow for the detection of the substance flare is branched off.
- Part of the ion current can also be transferred after the ions have been transferred branched off in a vacuum and measured.
- the batches of substances also do not require physico-chemical separation processes to be delivered.
- the batches of substances can also be obtained from pulsed pyrolysis, for example the well-known Curie point pyrolysis, or from desorption originate, which were induced by laser pulses. In this case there is a detection the relapses are not necessary because the times for the relapses to occur are already known.
- the thermalization should continue in its own buffer , two buffers are sufficient, one for thermalization and one for the delivery of the mass spectrometer. Are for pyrolysis but generally very large buffers are required because of pyrolysis mixtures are very complex and many subsequent examinations, often with selective Saving rare ion types, need.
- This invention is special for the investigation of ions from pyrolysis processes helpful.
- the substances in the pyrolysis vapors range up to very high molecular weights. These molecules must not be hit by walls, otherwise they will immediately condense out in the form of the known pyrolysis tar. Rather, you need to be ionized immediately, for example by chemical ionization at atmospheric pressure (APCI). As ions, they can then be guided more smoothly than in Form of neutral molecules. The longer storage for several consecutive Examinations are even only possible in the form of ions.
- APCI chemical ionization at atmospheric pressure
- That kind of Ionization is particularly beneficial for pyrolysis vapors and desorption vapors, however also for substances that were separated by gas chromatography.
- the introduction of the ions into the vacuum can also proceed differently than in FIG. 4 shown. They are simple, nozzle-like openings, for example such, with great success with a diameter of 30 micrometers, which were essential larger pumps require than the input capillaries described above.
- the inlet capillary (13) can also be much shorter, but with a smaller inner diameter, be trained.
- the gas flow into the vacuum system is then a lot less, and the differential pump stage (14) can be completely saved.
- the input capillary (13) then leads the ions directly into the first buffer (16) of the differential pump chamber (17).
- the cheapest way of introducing the ions into the vacuum - opening, wide capillary, narrow capillary - depends on how narrow space the ions are formed and how many ions are formed.
- the number of buffers in the main vacuum chamber (19) can of course be adapted to the measurement problem. There can only be one cache there be present, for example for the analysis of pyrolysis vapors or desorption ions, four or more buffers can also be installed, if it is primarily the analysis of complex mixtures with fast separation acts. Because the ions are relatively lossless from one storage to the next can be transferred, the number of buffers can be freely selected.
- the ion trap mass spectrometer (21, 22, 23) can also by other types of Mass spectrometers are replaced.
- mass spectrometers for recording high-resolution mass spectra ion cyclotron resonance mass spectrometers of primary ions or secondary (daughter) ions are suitable (ICR or FTMS) in a particularly good one Wise. Since the acquisition of mass spectra depends on the requirements of the mass range and mass resolution with the ICR spectrometer take a particularly long time can is a particular advantage for ICR mass spectrometers due to the invention given.
- mass spectrometers especially all types of Tandem mass spectrometers can be used. Because this mass spectrometer can be supplied with a continuous ion current here the switching lens of the buffer (20) can be controlled so that a long Time continuous discharge is given.
- the mass spectrometry specialist can with knowledge of his special field within mass spectrometry easily further examples of the advantages of using this invention.
- Excerpt from BFA 21/95 "Coupling the ion source with chromatographic or electrophoretic separation processes in the substance feeder results in a further advantage of this arrangement.
- the ions from individual batches of substance can be stored over a long period of time and examined by mass spectrometry by reducing the outflow rate of the ions the needs of the mass spectrometer are adapted.
- the ions can in successive filling and examination periods under different Aspects are examined. So it is possible to start with a normal mass spectrum to measure, and in subsequent steps daughter ion spectra of all occurring to generate ion types. It’s another benefit of caching, that the period of time for filling can be greatly reduced, and thus a faster sequence in the acquisition of the spectra is achieved.
- the ion source can in particular be coupled with devices for sample separation, for example with capillary electrophoresis.
- the capillary electrophoresis then delivers time-separated batches of substance for a short period of time in a very concentrated manner.
- the intermediate storage of the ions in the first double helix 8 can then be used particularly cheaply to store the ions of a substance for several fillings of the ion trap, which enables numerous MS / MS investigations of daughter ion spectra of different parent ions.Even MS / MS / MS investigations with grandchildren spectra can be carried out, the latter being special Interest in amino acid sequence analysis of proteins.
- the electrophoresis run can easily be interrupted for a longer period of time by switching off the voltage.
- Claim 18 from BFA 25/95 "Method according to one of claims 15 to 17, characterized in that the arrangement is used for storing the substance ions of a chromatographic or electrophoretically separated substance batch.”
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Claims (19)
- Verfahren zur Charakterisierung der Ionen von Substanzen oder Substanzgemischen, die einer lonenquelle in Schüben zugeführt werden, mit Hilfe eines Massenspektrometers und eines Zwischenspeichers zwischen lonenquelle und Massenspektrometer, dadurch gekennzeichnet, daß die Ionen eines oder mehrerer Substanzschübe zunächst im Zwischenspeicher gespeichert werden, und daß diese Ionen portionenweise massenspektrometrisch untersucht werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß noch weitere Zusatz-Zwischenspeicher für Ionen verwendet werden.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Zusatz-Zwischenspeicher zwischen der lonenquelle und dem Zwischenspeicher in Reihe angeordnet sind, und daß diese Zusatz-Zwischenspeicher bei Bedarf die Ionen weiterer Substanzschübe aufnehmen und bei Bedarf an den jeweils nächsten Zwischenspeicher weitergeben.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß multipolare (vielpolige) Hochfrequenz-lonenführungssysteme als Zwischenspeicher benutzt werden, wobei die lonenführungssysteme beidseitig mit reflektierenden Potentialverteilungen abgeschlossen sind, von denen aber mindestens eine Potentialverteilung auf lonendurchgang schaltbar ist.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß ein Hochfrequenz-Multipol-Stabsystem als Zwischenspeicher benutzt wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß ein System aus vertikal zu einer Achse angeordneten Ringen, die in abwechselnder Reihenfolge mit den Phasen einer Hochfrequenzspannung verbunden sind, als Zwischenspeicher benutzt wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß eine mit den beiden gegenläufigen Phasen einer Hochfrequenzspannung betriebene Doppel- oder Mehrfachhelix als Zwischenspeicher benutzt wird.
- Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß das als Zwischenspeicher benutzte System einen konisch geformten Innenraum hat, so daß ein permanenter Antrieb der Ionen in Achsenrichtung vorhanden ist.
- Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß längs der Achse des Zwischenspeichers zumindest temporär ein elektrisches Gleichfeld erzeugt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine HF-Quadrupol- oder ICR-lonenfalle als Massenspektrometer benutzt wird.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die lonenfalle nur bis zur Raumladungsgrenze befüllt wird, und daß der Füllvorgang durch die Füllrate der vorhergehenden Befüllung, durch die bekannte Abnahme der lonenanzahl im Zwischenspeicher und durch die Wirkrate eines eventuell eingeschalteten lonenfilters gesteuert wird.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß es sich bei dem Massenspektrometer um ein räumliches Tandem-Massenspektrometer handelt.
- Massenspektrometrisches System für die Charakterisierung von Substanzionen, bestehend aus einem Substanzzuführungssystem, das Substanzen in Schüben anliefert, einer lonenquelle für die lonisierung der Substanzmoleküle aus den Substanzschüben, und einem Massenspektrometer für die Untersuchung der lonen, dadurch gekennzeichnet, daß zwischen lonenquelle und Massenspektrometer mehrere Zwischenspeicher für eine temporäre Speicherung der Ionen aus den Substanzschüben angeordnet sind.
- Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, daß die Zwischenspeicher als drahtgewendelte Mehrfachhelices mit Anschluß an Spannungen aus je einem HF-Generator und mit jeweils endständigen Reflektoren ausgebildet sind.
- Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, daß mindestens einer der Reflektoren eine Doppelspirale mit Anschluß an die Hochfrequenzspannung des HF-Generators der Mehrfachhelix ist.
- Vorrichtung nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, daß die lonen in den Zwischenspeichern einem Antrieb in Achsenrichtung des Zwischenspeichers durch elektrische Felder unterliegen.
- Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, daß der lonenantrieb in Achsenrichtung durch das Pseudopotential gebildet wird, das sich durch eine konische Ausbildung des Zwischenspeichers ergibt.
- Vorrichtung nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, daß sich der erste Zwischenspeicher in der ersten Stufe einer Differenzpumpeinheit befindet, die durch eine Vakuumpumpe in einem Druckbereich zwischen 5x10-4 und 5x10-2 Millibar gehalten wird.
- Vorrichtung nach einem der Ansprüche 13 bis 18, dadurch gekennzeichnet, daß der letzte Zwischenspeicher eine Gaszuleitung besitzt, durch die ein Reaktantgas zugeführt werden kann.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/713,812 US5811800A (en) | 1995-09-14 | 1996-09-13 | Temporary storage of ions for mass spectrometric analyses |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19509939 | 1995-03-18 | ||
DE19509939 | 1995-03-18 | ||
DE19520282 | 1995-06-02 | ||
DE19520282 | 1995-06-02 | ||
DE19523859A DE19523859C2 (de) | 1995-06-30 | 1995-06-30 | Vorrichtung für die Reflektion geladener Teilchen |
DE19523859 | 1995-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0738000A1 EP0738000A1 (de) | 1996-10-16 |
EP0738000B1 true EP0738000B1 (de) | 2000-02-16 |
Family
ID=27214958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95114449A Expired - Lifetime EP0738000B1 (de) | 1995-03-18 | 1995-09-14 | Zwischenspeicherung von Ionen für massenspektrometrische Untersuchungen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0738000B1 (de) |
DE (1) | DE59507820D1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999063578A2 (en) * | 1998-06-01 | 1999-12-09 | Mds Inc. | Axial ejection in a multipole mass spectrometer |
GB2302985B (en) * | 1995-06-30 | 2000-01-12 | Bruker Franzen Analytik Gmbh | Method and device for the reflection of charged particles at surfaces |
AU718774B2 (en) * | 1996-06-06 | 2000-04-20 | Mds Inc. | Axial ejection in a multipole mass spectrometer |
WO2003089908A1 (en) * | 2002-04-16 | 2003-10-30 | Diakyne Pty Ltd | Sample collecting device and mass spectrometry of device |
DE102006040000A1 (de) * | 2006-08-25 | 2008-04-03 | Bruker Daltonik Gmbh | Speicherbatterie für Ionen |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9523658B2 (en) | 2013-03-06 | 2016-12-20 | Micromass Uk Limited | Optimised ion mobility separation timescales for targeted ions |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2689132B2 (ja) | 1988-06-02 | 1997-12-10 | ヤマハ発動機株式会社 | 2サイクルディーゼルエンジン |
US5179278A (en) | 1991-08-23 | 1993-01-12 | Mds Health Group Limited | Multipole inlet system for ion traps |
-
1995
- 1995-09-14 DE DE59507820T patent/DE59507820D1/de not_active Expired - Lifetime
- 1995-09-14 EP EP95114449A patent/EP0738000B1/de not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2302985B (en) * | 1995-06-30 | 2000-01-12 | Bruker Franzen Analytik Gmbh | Method and device for the reflection of charged particles at surfaces |
AU718774B2 (en) * | 1996-06-06 | 2000-04-20 | Mds Inc. | Axial ejection in a multipole mass spectrometer |
US6177668B1 (en) | 1996-06-06 | 2001-01-23 | Mds Inc. | Axial ejection in a multipole mass spectrometer |
WO1999063578A2 (en) * | 1998-06-01 | 1999-12-09 | Mds Inc. | Axial ejection in a multipole mass spectrometer |
WO2003089908A1 (en) * | 2002-04-16 | 2003-10-30 | Diakyne Pty Ltd | Sample collecting device and mass spectrometry of device |
DE102006040000A1 (de) * | 2006-08-25 | 2008-04-03 | Bruker Daltonik Gmbh | Speicherbatterie für Ionen |
DE102006040000B4 (de) * | 2006-08-25 | 2010-10-28 | Bruker Daltonik Gmbh | Speicherbatterie für Ionen |
Also Published As
Publication number | Publication date |
---|---|
DE59507820D1 (de) | 2000-03-23 |
EP0738000A1 (de) | 1996-10-16 |
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