WO2006022283A1 - 電気泳動測定によるイオン性化合物の移動時間予測方法 - Google Patents
電気泳動測定によるイオン性化合物の移動時間予測方法 Download PDFInfo
- Publication number
- WO2006022283A1 WO2006022283A1 PCT/JP2005/015325 JP2005015325W WO2006022283A1 WO 2006022283 A1 WO2006022283 A1 WO 2006022283A1 JP 2005015325 W JP2005015325 W JP 2005015325W WO 2006022283 A1 WO2006022283 A1 WO 2006022283A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrophoresis
- migration time
- compound
- predicting
- substance
- Prior art date
Links
Classifications
-
- 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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/447—Systems using electrophoresis
Definitions
- the present invention is measured with a microchip electrophoresis, a capillary electrophoresis (CE), or a capillary electrophoresis Z-mass spectrometer (C EZMS) combining a capillary electrophoresis (CE) and mass spectrometry (MS).
- CE capillary electrophoresis
- C EZMS capillary electrophoresis Z-mass spectrometer
- the present invention relates to a method for predicting the migration time of an ionic compound by electrophoretic measurement for predicting the detection time of an ionic compound.
- the peak measured by a separation analyzer such as microchip electrophoresis, capillary electrophoresis (CE), or high performance liquid chromatographic (HPLC) is the appearance time of the peak of a standard substance with a known compound name.
- the substance has been identified by comparing with (see Japanese Patent No. 3341765).
- the standard materials available are limited, and the identification of substances related to all peaks has been impossible with the conventional method.
- This prediction method is based on the principle that the mobility of each substance in electrophoresis is “proportional to the charge of the substance and inversely proportional to the sample viscosity and the hydrated ion radius”.
- this prediction method was devised based on various assumptions such as “assuming ions are spherical” and “no slip occurs between electrophoresis buffer and substance”. Many examples have been reported in which the actual and predicted time values do not match. Further, the numerical parameters related expression that few studies example to predict the specific substance group only Nag predicted such homologs is also what is tuned separately for each goods group, in advance what kind of material If you do not know whether it exists, you can not use it.
- CEZMS having high sensitivity and high selectivity, which is a combination of capillary electrophoresis and mass spectrometry, has also been developed (see JP 2001-83119 A).
- the same prediction model cannot be used as it is in CE and CEZMS because the material is subjected to suction or back pressure from the MS connected to the outlet of the carrier while moving in the carrier. And there were problems.
- the present invention has been made to solve the above-mentioned conventional problems, and there has been a mixture of all types of microchip electrophoresis and CEZMS, which has been successful for everyone. It is an object to predict the mobility of a group of low molecular compounds.
- the present invention relates to microchip electrophoresis, capillary electrophoresis, or capillary electrophoresis.
- the feature quantity is calculated from a three-dimensional structure predicted from the two-dimensional structure of the substance, a discriminator indicating the characteristics of the molecule, the ionization index calculated from the two-dimensional structure force of the molecule, and the ion of the compound
- the valence is included.
- n is the number of pKa of the substance that produces a negative charge
- m is the number of pKa of the substance that produces a positive charge
- pH For microchip electrophoresis, use the pH value of the electrophoresis buffer used in CE or CEZMS.
- the migration time is a relative migration time obtained by normalizing the migration time of the compound measured in the electrophoresis or electrophoresis Z mass spectrometer with the migration time of the internal standard substance.
- the relationship is learned by, for example, a back propagation method using a three-layer neural network having an input layer, a hidden layer, and an output layer.
- the migration time of microchip electrophoresis, CE and CEZMS is increased from its two-dimensional structure. Can be predicted with accuracy. Therefore, if the structural formula is known, the substance detected by microchip electrophoresis, CE or CEZMS can be specified even without a standard substance.
- FIG. 1 Schematic diagram showing a configuration example of a capillary electrophoresis Z mass spectrometer to which the present invention is applied.
- FIG. 2 An example of the relationship between the two-dimensional molecular structure and the three-dimensional molecular structure predicted by the present invention
- FIG. 3 is a diagram showing examples of values assigned to the input / output layers and the structure of the “Ural” network used in the present invention.
- FIG. 5 is a diagram showing an example of a relationship between an actual measured value and a predicted value of relative movement time in an example of the present invention.
- CEZMS which is one of the objects to which the present invention is applied, includes, for example, a capillary electrophoresis apparatus (CE) 30 for separating a sample as shown in FIG. 1, and an atomizing apparatus for atomizing the separated sample. Electrospray – $ 40 a day and an atomized sample force consisting of a mass spectrometer (MS) 50 that analyzes ionic compounds.
- CE capillary electrophoresis apparatus
- MS mass spectrometer
- the CE30 is introduced into the parasite 32, the buffer tank 20 for storing an electrophoretic buffer (also referred to as a buffer) 22 for separating the sample, and the electrophoretic buffer 2
- the electrospray-one dollar 40 includes a sheath liquid 4 stored in a sheath liquid tank 42.
- a four-force pump 46 supplies a liquid amount suitable for electrospray and a nebulizer gas (for example, nitrogen gas) 48 that generates fine droplets and promotes ionization.
- a nebulizer gas for example, nitrogen gas
- the MS 50 includes a cone 52.
- the cone 52 is supplied with a fragmentor voltage for accelerating ions to collide with nitrogen gas and generating fragment ions, and enters from the C E30.
- a drying gas (for example, nitrogen gas) 54 for volatilizing the solvent is supplied.
- the travel time prediction according to the present invention is performed as follows.
- the three-dimensional structure of the substance as illustrated in FIG. 2 is converted from the two-dimensional structure. Predict. At this time, assuming that the three-dimensional structure exists alone in the vacuum and has no influence from others, the shape of the compound itself is taken to have the most stable structure in terms of energy.
- a discriminator indicating molecular features is calculated from the predicted three-dimensional structure.
- the standard discriminator of Molecular Operating Environment (MOE) from Chemical Computing Group Inc. can be used.
- the acid dissociation index pKa is calculated from the two-dimensional structure of the molecule, and the ionic valence of the compound is calculated using the following equations (1) to (3).
- n is the number of pKa of the substance that produces a negative charge
- m is the number of pKa of the substance that produces a positive charge
- pH For microchip electrophoresis, use the pH value of the electrophoresis buffer used in CE or CEZMS.
- the number of nodes in the output layer of the -Ural 'network ANN is fixed at 1, and the relative movement time of the compound normalized by the movement time of the internal standard substance is added.
- the number of nodes in the input layer is the sum of the number of discriminators to be input, the acid dissociation index pKa, and the ionic valence.
- V * 0.8 * (log V— log V) / (log V — log V) +0.1.
- V * 0. 8 * (V— V) / (V -V) +0.1--(5)
- V is a normalized value
- V and V are the maximum and maximum values in the target compound.
- V * is the normalized value.
- the same learning data as shown in Fig. 4 is trained by a number of -Ural networks ANN to A NN, and the ANN ensemble method is used to take the average value of each ANN output.
- the ensemble method can be omitted.
- the migration time of a cationic small molecule was predicted.
- a fused silica cavity having an inner diameter of 50 ⁇ m, an outer diameter of 360 ⁇ m, and a total length of 100 cm was used.
- the applied voltage was measured at +30 kV, and the temperature of the cavity 32 was measured at 20 ° C.
- Samples were injected for 3 seconds at 50mbar using the pressure method.
- the mass spectrometer (MS) 50 used the positive ion mode of the electrospray ionization method, the chiral voltage was set to 4000V, and the fragmentor was set to 100V.
- Nitrogen was used as the drying gas 54, and the gas temperature was measured at 300 ° C and a flow rate of 101Z.
- the sheath solution 44 10 mM ammonium acetate and 50% aqueous methanol solution were used, and the solution was fed at a flow rate of 10 ⁇ 1Z. Methionine sulfone was added to the measurement sample as an internal standard substance, and the movement time of each measurement substance was corrected using the movement time of methionine sulfone to obtain the relative movement time.
- the two-dimensional molecular structure used in the MDL ZMol format of MDL is a substance registered in the KEGG Ligand Database that can be downloaded from http: ⁇ ligand.genome.ad.jp: 8080 / compound /.
- the Molecular Operating Environment (MOE) of Chemical Computing Group Inc. was used for prediction of 3D molecular structure from 2D molecular structure and discrimination of material characteristics. In other words, MOE's Energy Minize function was used to predict the 3D structure, and 192 standard discriminators were calculated.
- I learned ANN by using the following cross reduction method.
- the 271 actual measurement data is randomly divided into groups (about 90% of the learning data and the remaining 10% of the test data).
- Equation (4) logarithmically normalized by Equation (4), and those that are 10 3 or less are linearly normalized by Equation (5). .
- ANN learning parameters were set as follows.
- the number of hidden layer units was 10, 20, ..., 100.
- the number of learning was 8000.
- the initial weight between units was generated using random numbers. Using different random seeds, we generated 10 initial weight patterns for all combinations of the above settings. That is, we learned 400 patterns of ANN with 4 (learning rate) X 10 (hidden layer) X 10 (L number).
- Fig. 5 shows the relationship between the measured value and the predicted value of the relative movement time in which 271 cations were predicted using the above conditions.
- the correlation coefficient between the relative travel time predicted by this method and the relative travel time measured by CEZMS was a high value of 0.931.
- the ion spectrometer by the electrospray method (ESI) is used in the mass spectrometer (MS).
- the ionization method is not limited to this, and the atmospheric pressure chemistry is not limited thereto.
- the mass spectrometer is not limited to the single-stage quadrupole mass spectrometer shown in the figure, and other types of mass spectrometers such as a magnetic field type, a time of flight, an ion trap, and a tandem type mass spectrometer. It may be an analyzer (MS / MS, MS n ). Furthermore, not only CE / MS but also CE alone may be used. Further, instead of CE, microchip electrophoresis may be used.
- the movement time of the force compound can be predicted only for the two-dimensional structure, although the accuracy is somewhat lowered.
- any data format can be used for prediction as long as it is a file format in which the two-dimensional structure of the molecule is known.
- logarithmic normalization is performed for data having a large difference between the maximum value and the minimum value, and other values are linear normalization. Although the accuracy is somewhat reduced, any normalization method may be used. Industrial applicability
- the present invention relates to ions measured by microchip electrophoresis, capillary electrophoresis (CE), or a capillary electrophoresis Z-mass spectrometer (C EZMS) in which a combination of the capillary electrophoresis (CE) and mass spectrometry (MS). It can be used to predict the detection time of a chemical compound.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/660,676 US20070256935A1 (en) | 2004-08-25 | 2005-08-24 | Method for Predicting the Migration Time of Ionic Compounds by Electrophoretic Measurement |
EP05780897A EP1783485A1 (en) | 2004-08-25 | 2005-08-24 | Method of predicting traveling time of ionic compound by electrophoresis measuring |
CA002578436A CA2578436A1 (en) | 2004-08-25 | 2005-08-24 | Method of predicting traveling time of ionic compound by electrophoresis measuring |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004245728A JP3871689B2 (ja) | 2004-08-25 | 2004-08-25 | 電気泳動測定によるイオン性化合物の移動時間予測方法 |
JP2004-245728 | 2004-08-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006022283A1 true WO2006022283A1 (ja) | 2006-03-02 |
Family
ID=35967492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/015325 WO2006022283A1 (ja) | 2004-08-25 | 2005-08-24 | 電気泳動測定によるイオン性化合物の移動時間予測方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070256935A1 (ja) |
EP (1) | EP1783485A1 (ja) |
JP (1) | JP3871689B2 (ja) |
CA (1) | CA2578436A1 (ja) |
WO (1) | WO2006022283A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020141578A (ja) * | 2019-03-05 | 2020-09-10 | 株式会社日立ハイテク | 遺伝子型解析装置及び方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105723213B (zh) | 2013-08-29 | 2019-09-13 | 圣母大学 | 高灵敏度电喷射接口 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002005886A (ja) * | 2000-06-20 | 2002-01-09 | Japan Science & Technology Corp | 電気泳動分析方法 |
JP2003025698A (ja) * | 2001-07-13 | 2003-01-29 | Fujitsu Ltd | 電子装置、その電子ユニット及びユニット間の版数互換性判別処理方法 |
JP2004264069A (ja) * | 2003-02-28 | 2004-09-24 | Dai Ichi Seiyaku Co Ltd | 構造類似物質の分離予測方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5286356A (en) * | 1993-01-21 | 1994-02-15 | Millipore Corporation | Method for sample analysis using capillary electrophoresis |
DE69908602T2 (de) * | 1998-09-30 | 2004-06-03 | Cygnus, Inc., Redwood City | Verfahren und vorrichtung zum vorhersagen von physiologischen messwerten |
US20070116607A1 (en) * | 2005-11-23 | 2007-05-24 | Pharmacom Microlelectronics, Inc. | Microsystems that integrate three-dimensional microarray and multi-layer microfluidics for combinatorial detection of bioagent at single molecule level |
-
2004
- 2004-08-25 JP JP2004245728A patent/JP3871689B2/ja active Active
-
2005
- 2005-08-24 CA CA002578436A patent/CA2578436A1/en not_active Abandoned
- 2005-08-24 US US11/660,676 patent/US20070256935A1/en not_active Abandoned
- 2005-08-24 WO PCT/JP2005/015325 patent/WO2006022283A1/ja active Application Filing
- 2005-08-24 EP EP05780897A patent/EP1783485A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002005886A (ja) * | 2000-06-20 | 2002-01-09 | Japan Science & Technology Corp | 電気泳動分析方法 |
JP2003025698A (ja) * | 2001-07-13 | 2003-01-29 | Fujitsu Ltd | 電子装置、その電子ユニット及びユニット間の版数互換性判別処理方法 |
JP2004264069A (ja) * | 2003-02-28 | 2004-09-24 | Dai Ichi Seiyaku Co Ltd | 構造類似物質の分離予測方法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020141578A (ja) * | 2019-03-05 | 2020-09-10 | 株式会社日立ハイテク | 遺伝子型解析装置及び方法 |
WO2020179405A1 (ja) * | 2019-03-05 | 2020-09-10 | 株式会社日立ハイテク | 遺伝子型解析装置及び方法 |
GB2595605A (en) * | 2019-03-05 | 2021-12-01 | Hitachi High Tech Corp | Genotype analysis device and method |
JP7224207B2 (ja) | 2019-03-05 | 2023-02-17 | 株式会社日立ハイテク | 遺伝子型解析装置及び方法 |
GB2595605B (en) * | 2019-03-05 | 2023-05-17 | Hitachi High Tech Corp | Genotype analysis device and method |
Also Published As
Publication number | Publication date |
---|---|
JP3871689B2 (ja) | 2007-01-24 |
US20070256935A1 (en) | 2007-11-08 |
JP2006064472A (ja) | 2006-03-09 |
EP1783485A1 (en) | 2007-05-09 |
CA2578436A1 (en) | 2006-03-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Moldoveanu et al. | Selection of the HPLC method in chemical analysis | |
US9778223B2 (en) | System and method for the separation of analytes | |
Kim et al. | Ions from solution to the gas phase: a molecular dynamics simulation of the structural evolution of substance P during desolvation of charged nanodroplets generated by electrospray ionization | |
Zhao et al. | Single-molecule spectroscopy of amino acids and peptides by recognition tunnelling | |
US6653627B2 (en) | FAIMS apparatus and method with laser-based ionization source | |
JP4818116B2 (ja) | メタボノミクスにおいてlc−msまたはlc−ms/msデータの処理を行うための方法およびデバイス | |
Beegle et al. | Effects of drift-gas polarizability on glycine peptides in ion mobility spectrometry | |
Smith et al. | Image charge detection mass spectrometry: pushing the envelope with sensitivity and accuracy | |
EP1480251A2 (en) | System of analyzing complex mixtures of biological and other fluids to identify biological state information | |
US9490110B2 (en) | Multi-segment injection-capillary electrophoresis-mass spectrometry (MSI-CE-MS): a multiplexed screening platform and data workflow for chemical analysis | |
CN104025248A (zh) | 质量分析装置 | |
Peterson et al. | Advantages and limitations of coupling isotachophoresis and comprehensive isotachophoresis–capillary electrophoresis to time-of-flight mass spectrometry | |
Zhao et al. | In situ ion-transmission mass spectrometry for paper-based analytical devices | |
Palmer et al. | Exact mass determination of narrow electrophoretic peaks using an orthogonal acceleration time‐of‐flight mass spectrometer | |
WO2006022283A1 (ja) | 電気泳動測定によるイオン性化合物の移動時間予測方法 | |
JP2004500541A (ja) | 複合生化学サンプル中の強結合配位子の検出及び分析の方法 | |
Akashi et al. | Top‐down analysis of basic proteins by microchip capillary electrophoresis mass spectrometry | |
Douglass et al. | Predicting the highest intensity ion in multiple charging envelopes observed for denatured proteins during electrospray ionization mass spectrometry by inspection of the amino acid sequence | |
Ku et al. | Cluster ion formation in electrosprays of acetonitrile seeded with ionic liquids | |
WO2003102992A2 (en) | Method and apparatus for the detection of noncovalent interactions by mass spectrometry-based diffusion measurements | |
Ma et al. | Accurate quantitative structure–property relationship model of mobilities of peptides in capillary zone electrophoresis | |
Dayon et al. | Multitrack electrospray chips | |
Lübbert et al. | Mobility-classified mass spectrometry reveals a complete picture of the electrospray outcome | |
Martin et al. | CE‐MS method development for peptides analysis, especially hepcidin, an iron metabolism marker | |
You et al. | Unsupervised Reconstruction of Analyte-Specific Mass Spectra Based on Time-Domain Morphology with a Modified Cross-Correlation Approach |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005780897 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2578436 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11660676 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2005780897 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11660676 Country of ref document: US |