WO2008059568A1 - Procédé d'analyse de données de spectrométrie de masse et dispositif associé - Google Patents
Procédé d'analyse de données de spectrométrie de masse et dispositif associé Download PDFInfo
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- WO2008059568A1 WO2008059568A1 PCT/JP2006/322741 JP2006322741W WO2008059568A1 WO 2008059568 A1 WO2008059568 A1 WO 2008059568A1 JP 2006322741 W JP2006322741 W JP 2006322741W WO 2008059568 A1 WO2008059568 A1 WO 2008059568A1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0027—Methods for using particle spectrometers
- H01J49/0036—Step by step routines describing the handling of the data generated during a measurement
Definitions
- the present invention relates to a data analysis method and apparatus for identifying a substance produced by a chemical change such as a metabolite using data obtained by mass spectrometry.
- Metabolites that are the products of chemical changes in vivo in various fields such as diagnosis of various diseases and diseases, evaluation of efficacy and safety of pharmaceuticals and functional foods, research on lifestyle and health
- a method for comprehensive analysis of metabolites called metabolomics has attracted attention.
- V which is not registered in the database, cannot be found even if an unknown metabolite is present in the sample. Even if it can be inferred that the peak is due to an unknown metabolite, the composition of the metabolite cannot be known.
- Non-Patent Document 1 “Shimadzu Metabolomitas Solution”, [Searched on November 8, 2006], Shimadzu Corporation, Internet ⁇ URL: http://www.an.shimadzu.co.jp/ topics / 2006 1200b ⁇ 0 / metabo / metabolome.htm
- the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an original material having a known composition based on mass spectral data acquired by mass spectrometry. It is an object of the present invention to provide a mass spectrometry data analysis method and apparatus capable of estimating the composition with high accuracy even if a product produced by chemical change is unknown.
- a composition of a product generated by a chemical change of a raw material having a known composition is obtained by mass spectrometry of the product.
- the second invention embodies the mass spectrometry data analysis method according to the first invention on a computer, and is a method for producing a product generated by a chemical change of a raw material having a known composition.
- composition estimating means for estimating the composition of the product It is characterized by comprising.
- i-change is typically metabolism, and in this case, the "product” is a metabolite (metabolite).
- Many metabolic pathways are known from various past studies. For example, it is known that drug metabolism, which is important for verifying the efficacy and safety of pharmaceuticals, can be broadly divided into two stages: a phase 1 reaction and a phase 2 reaction.
- polar groups such as a hydroxyl group, a carboxyl group, and an amino group are generated or introduced into the raw material by oxidation, reduction, hydrolysis, or the like.
- the user is based on the estimation or knowledge of such metabolic pathways, and the raw material added to the raw material by, for example, metabolic reaction.
- Information on the part (eg, polar group) that may be removed from the substance or replaced in the raw material is input by the information input means. For example, it is possible to select one or more from a number of options prepared in advance.
- the condition calculation means calculates the maximum value of the increase or decrease of each element from the raw material due to metabolism based on the prediction information. For example, in the case of a reaction in which a hydroxyl group (one OH) is added, oxygen and hydrogen are increased by one each. If several reaction possibilities are specified, the raw material strength is increased accordingly.
- the range of increase or decrease of the number of each element is determined, that is, the maximum increase value and the maximum decrease value.
- the composition of the raw material that is, the number of each constituent element is known, the maximum value and the minimum value of the number of each constituent element of the product can be obtained using the above increase maximum value 'decrease maximum value'. .
- the composition estimation means for example, the mass of the product with the maximum value 'minimum value of each constituent element of the product, that is, the possible range of the number of elements, as the calculation condition Search for combinations of types and numbers of elements that are consistent with each other. Since there may be a certain degree of error in mass spectrometry, it is recommended to set a suitable tolerance for the mass and put it within this range as a candidate composition. The search for the composition using the consistency with the mass as described above is practically impossible because there are too many combinations. Since the types and numbers are reasonably limited, the search can be performed in a relatively short time, and one or more composition candidates can be accurately selected. Can be found.
- the composition estimation means calculates the mass difference from the mass of the raw material when given the mass of the product to be identified, and the maximum increase value of each constituent element accompanying the chemical reaction 'Search for combinations of element types and numbers that can be matched with the above mass difference under the condition of maximum decrease. Estimate the composition of the product, assuming that what has been found is added to or removed from the raw material. According to this, it is possible to reduce the calculation amount associated with the composition estimation.
- the mass spectrometry data analysis method and apparatus according to the present invention can estimate the composition with high accuracy even if a product generated by a chemical change such as metabolism is unknown.
- MS n analysis (n is 2 or more) is possible, multiple fragment peaks derived from this product appear by performing MS 2 analysis using an unknown product as a precursor. A mass spectrum can be acquired. As a result, the mass of each fragment ion can be obtained and the composition of the product of this mass force can be estimated, and this can be used to narrow down product composition candidates.
- FIG. 1 is a schematic configuration diagram of an embodiment of a mass spectrometry system including a data analysis apparatus according to the present invention.
- FIG. 2 is a flowchart showing an example of the procedure of an unknown metabolite analysis processing operation by the mass spectrometry system of the present embodiment.
- FIG. 1 is a schematic configuration diagram of an embodiment of a mass spectrometry system including a data analysis apparatus according to the present invention.
- the mass spectrometer 1 is an ion trap time-of-flight mass spectrometer (IT T)
- the data processing unit 2 that receives mass spectrum data is usually implemented by a personal computer, and a processing function described later is achieved by executing a predetermined program installed in the computer.
- the data processing unit 2 includes a mass spectrum creation unit 21, a metabolite identification processing unit 22, and an estimation condition setting unit 23 as functional blocks.
- the mass spectrum creation unit 21 creates a mass spectrum based on the received data.
- the metabolite identification processing unit 22 estimates the composition of the target metabolite and executes one or a plurality of composition candidates by performing arithmetic processing as described below based on the mass spectrum obtained by mass spectrometry. Look out and output to output unit 4 To help.
- the estimation condition setting unit 23 sets calculation conditions for metabolite identification based on the information given from the input unit 3.
- the input unit 3 corresponds to an information input unit in the present invention
- the metabolite identification processing unit 22 corresponds to a composition estimation unit
- the estimation condition setting unit 23 corresponds to a condition calculation unit.
- the sample to be analyzed by the mass spectrometer 1 is the analyte (actually metabolized by actually administering drug A) and the control (without administering drug A, otherwise Collected under the same conditions as the analyte).
- each of these two samples is analyzed by the mass spectrometer 1 and a mass spectrum is created by the mass spectrum creation unit 21 (step Sl).
- the metabolite identification processing unit 22 compares the two mass spectra and extracts a peak that exists only in the mass spectrum of the analyte (step S2). Since this peak is newly generated by metabolism, it can be estimated that the substance corresponding to this peak is a metabolite. Therefore, a known metabolite is first identified by comparing the mass of each peak with a metabolite database prepared in advance (step S3).
- step S4 If the metabolite is registered in the metabolite database and exists in the analyte, an unidentified peak remains, which becomes an unknown metabolite. Therefore, this unknown metabolite peak is extracted and its mass is read (step S4). If all the metabolites have been identified in the process of step S3, there is no problem, but if an unknown metabolite is present, for example, a display informing that is given to the output unit 4, and the user responds to this. Information on drug metabolism is input from the input unit 3 (step S5). In other words, in general, many past research capabilities are known for metabolic pathways. For example, drug metabolism can be broadly divided into two-stage reactions, the first phase and the second phase.
- the estimation condition setting unit 23 calculates the maximum increase value and the maximum decrease value of each constituent element accompanying metabolism based on this (Ste S6).
- the maximum value of increase and the maximum value of decrease determine the range of change of the constituent elements that change with metabolism.
- the variation range of the type and number of drug A elements accompanying metabolism is obtained as shown in the following table.
- carbon (C) can cause a change that decreases by up to 3 from the original drug A and increases by up to 6 with metabolism.
- step S7 the condition for obtaining the possible range of the type and number of constituent elements of the unknown metabolite from the known composition and the maximum increase value and the maximum decrease value of each of the above constituent elements.
- a table (step S7). For example, corresponding to Table 1 above, the maximum and minimum values of the types and number of constituent elements of unknown metabolites are obtained as shown in Table 2.
- the metabolite identification processing unit 22 estimates the composition by searching for a combination of elements that matches the mass of the unknown metabolite that is also given a peak force as described above (step S8). For example, if the mass of an unknown metabolite is 194.0790u, Set a predetermined tolerance range that includes measurement errors, etc., and search for combinations of elements that fall within that tolerance range. Because the types and number of elements are limited, the number of combinations that should be compared with those is enormous, and the number of combinations that can be consistent with the mass of metabolites is also very large. is not.
- the mass itself of the unknown metabolite under the calculation conditions shown in Table 2 was also estimated. If, on the other hand, it is possible to estimate that the drug A force is a part of the drug A, or if it can be estimated, or if such an assumption can be made, the mass of the drug A and the mass of the metabolite B It is often advantageous to estimate the composition with respect to the difference. This is because, unless a component having a very high molecular weight is added or desorbed, the change in mass associated with metabolism is considerably smaller than the mass of the metabolite B, and the number of combinations of elements that can be taken is small. It is.
- the composition of an unknown metabolite that has been predicted and can be easily estimated with high accuracy.
- the above embodiment is an example of the present invention, and it is obvious that modifications, changes, additions, and the like as appropriate within the scope of the present invention are included in the scope of the claims of the present application.
- the present invention can be used for identification of unknown substances generated with general chemical changes such as chemical changes due to synthesis of polymer compounds as well as changes due to metabolism.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/322741 WO2008059568A1 (fr) | 2006-11-15 | 2006-11-15 | Procédé d'analyse de données de spectrométrie de masse et dispositif associé |
US12/445,882 US20100312487A1 (en) | 2006-11-15 | 2006-11-15 | Mass analysis data analyzing method and apparatus thereof |
JP2008544031A JP4811467B2 (ja) | 2006-11-15 | 2006-11-15 | 質量分析データ解析方法及び装置 |
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PCT/JP2006/322741 WO2008059568A1 (fr) | 2006-11-15 | 2006-11-15 | Procédé d'analyse de données de spectrométrie de masse et dispositif associé |
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WO2008059568A1 true WO2008059568A1 (fr) | 2008-05-22 |
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PCT/JP2006/322741 WO2008059568A1 (fr) | 2006-11-15 | 2006-11-15 | Procédé d'analyse de données de spectrométrie de masse et dispositif associé |
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US (1) | US20100312487A1 (ja) |
JP (1) | JP4811467B2 (ja) |
WO (1) | WO2008059568A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013051148A1 (ja) * | 2011-10-07 | 2013-04-11 | 株式会社島津製作所 | 質量分析データ解析方法及び装置 |
JP2020085822A (ja) * | 2018-11-30 | 2020-06-04 | 日本電子株式会社 | 化学構造推定装置及び方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8026476B2 (en) * | 2006-09-21 | 2011-09-27 | Shimadzu Corporation | Mass analyzing method |
EP2741224A1 (en) * | 2012-11-20 | 2014-06-11 | Thermo Finnigan LLC | Methods for generating local mass spectral libraries for interpreting multiplexed mass spectra |
JP6149810B2 (ja) * | 2014-06-13 | 2017-06-21 | 株式会社島津製作所 | 代謝物解析システム及び代謝物解析方法 |
US11237154B2 (en) * | 2015-05-29 | 2022-02-01 | Waters Technologies Corporation | Metabolic pathway and metabolite identification |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003529044A (ja) * | 1999-04-20 | 2003-09-30 | ターゲット ディスカバリー, インコーポレイテッド | ポリペプチドフィンガープリント法、代謝プロファイル、およびバイオインフォマティクスデータベース |
JP2006017570A (ja) * | 2004-07-01 | 2006-01-19 | Sumitomo Chemical Co Ltd | 薬物代謝酵素反応により生じる代謝物の構造提案方法及びその利用 |
Family Cites Families (2)
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US6680203B2 (en) * | 2000-07-10 | 2004-01-20 | Esperion Therapeutics, Inc. | Fourier transform mass spectrometry of complex biological samples |
GB0415046D0 (en) * | 2004-07-05 | 2004-08-04 | Micromass Ltd | Mass spectrometer |
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2006
- 2006-11-15 WO PCT/JP2006/322741 patent/WO2008059568A1/ja active Application Filing
- 2006-11-15 JP JP2008544031A patent/JP4811467B2/ja active Active
- 2006-11-15 US US12/445,882 patent/US20100312487A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003529044A (ja) * | 1999-04-20 | 2003-09-30 | ターゲット ディスカバリー, インコーポレイテッド | ポリペプチドフィンガープリント法、代謝プロファイル、およびバイオインフォマティクスデータベース |
JP2006017570A (ja) * | 2004-07-01 | 2006-01-19 | Sumitomo Chemical Co Ltd | 薬物代謝酵素反応により生じる代謝物の構造提案方法及びその利用 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013051148A1 (ja) * | 2011-10-07 | 2013-04-11 | 株式会社島津製作所 | 質量分析データ解析方法及び装置 |
CN103842809A (zh) * | 2011-10-07 | 2014-06-04 | 株式会社岛津制作所 | 质量分析数据解析方法以及装置 |
JPWO2013051148A1 (ja) * | 2011-10-07 | 2015-03-30 | 株式会社島津製作所 | 質量分析データ解析方法及び装置 |
JP2020085822A (ja) * | 2018-11-30 | 2020-06-04 | 日本電子株式会社 | 化学構造推定装置及び方法 |
JP7266997B2 (ja) | 2018-11-30 | 2023-05-01 | 日本電子株式会社 | 化学構造推定装置及び方法 |
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JPWO2008059568A1 (ja) | 2010-02-25 |
JP4811467B2 (ja) | 2011-11-09 |
US20100312487A1 (en) | 2010-12-09 |
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