Diquat

Diquat

CAS Number85-00-7
Molecular FormulaC12H12N2+2
Molecular Weight184.242
InChI KeySYJFEGQWDCRVNX-UHFFFAOYSA-N
LogP1.4
Synonyms
  • DIQUAT
  • Diquat dication
  • 2764-72-9
  • Diquat ion
  • 1,1'-Ethylene-2,2'-bipyridylium ion
  • 1,1'-Ethylene-2,2'-bipyridyldylium ion
  • 9,10-Dihydro-8a,10a-diazoniaphenanthrene
  • Diquat [ANSI:BSI:ISO]
  • Reglox
  • EINECS 220-433-0
  • Dipyrido(1,2-a:2',1'-c)pyrazinediium, 6,7-dihydro-
  • CHEBI:64163
  • 9,10-Dihydro-8a,10a-diazoniaphenanthrene ion
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazinediium
  • 6,7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium
  • 6,7-Dihydrodipyrido[1,2-A:2',1'-C]pyrazinediylium
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazine-5,8-di-ium
  • 6,7-Dihydrodipyrido(1,2-a:2',1'-c)pyrazinediylium
  • Dipyrido[1,2-a:2',1'-c]pyrazinediium, 6,7-dihydro-
  • UNII-A9A615U4MP

Applications:

HPLC Method for Analysis of Paraquat and Diquat on BIST B+ Column

2022-11-30

HPLC Method for Analysis of Paraquat and Diquat on BIST B+ by SIELC Technologies.

Separation type: Bridge Ion Separation Technology, or BIST™ by SIELC Technologies

HPLC Method for Analysis of Paraquat and Diquat on BIST B+ Column
HPLC Method for Analysis of Paraquat and Diquat on BIST B+ by SIELC Technologies.

High Performance Liquid Chromatography (HPLC) Method for Analyses of Paraquat and Diquat

Paraquat and Diquat are two of the most popular herbicides on the market. With fairly similar structures and interactions with typical ion-exchange columns, they are usually extremely difficult to separate. Using SIELC’s newly introduced BIST™ method, Paraquat and Diquat, which protonate in water, can be retained on a positively-charged anion-exchange BIST™ B column. There are two keys to this retention method: 1) a multi-charged, negative buffer, such as Sulfuric acid (H2SO4), which acts as a bridge, linking the positively-charged herbicide analytes to the positively-charged column surface and 2) a mobile phase consisting mostly of organic solvent (such as MeCN) to minimize the formation of a solvation layer around the charged analytes. What allows these two compounds to be separated using BIST™ is the slight difference in charge position between the two analytes. Since the analytes interact so close to the surface, the minor difference in charge distribution is magnified and therefore significantly affects each analyte’s retention ability. Using this new and unique analysis method, Paraquat and Diquat can be retained and UV detected at 250 nm.


Condition

ColumnBIST B+, 4.6×150 mm, 5 µm, 100A
Mobile PhaseMeCN – 70%
BufferH2SO4 – 0.2%
Flow Rate1.0 ml/min
DetectionUV 250 nm
Peak Retention Time4.7, 5.9 min

Description

Class of CompoundsHerbicides
Analyzing CompoundsParaquat and Diquat
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

BIST B

SIELC Technologies’ BIST™ Columns are a new and simple way to achieve many separations that are traditionally difficult or impossible to achieve with any other HPLC columns currently on the market! When used with our BIST™ mobile phases, these ion exchange columns can generate very strong retention of analytes that have the same charge polarity as the stationary phase, unlocking new chromatography applications that were previously too difficult to achieve.

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BIST B+

SIELC Technologies’ BIST™ Columns are a new and simple way to achieve many separations that are traditionally difficult or impossible to achieve with any other HPLC columns currently on the market! When used with our BIST™ mobile phases, these ion exchange columns can generate very strong retention of analytes that have the same charge polarity as the stationary phase, unlocking new chromatography applications that were previously too difficult to achieve.

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Application Analytes:
Diquat
Paraquat

HPLC Method for Simultaneous Determination of -Quat Herbicides on Obelisc R Column

2022-09-22

High Performance Liquid Chromatography (HPLC) Method for Analysis of Chlormequat, Mepiquat, Paraquat, Diquat

HPLC Method for Simultaneous Determination of -Quat Herbicides on Obelisc R Column by SIELC Technologies
HPLC Method for Simultaneous Determination of -Quat Herbicides on Obelisc R Column by SIELC Technologies

Condition

Column Obelisc R, 4.6×150 mm, 5 µm, 100A
Mobile Phase MeCN – 40%
Buffer Ammonium Formate pH 3.0
Flow Rate 1.0 ml/min
Detection ELSD 50C

Description

Class of Compounds Herbicides
Analyzing Compounds

Chlormequat, Mepiquat, Cl-, Br-, Paraquat, Diquat

SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

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Application Analytes:
Chlormequat
Diquat
Mepiquat
Paraquat

Separation of Herbicides Paraquat, Diquat and Glyphosate in One Run with LC/MS Compatible Conditions

2013-12-05

 

There is a need to separate different herbicides and pesticides in one run with LC/MS compatible conditions. Paraquat, diquat and glyphosate were separated on reversed-phase tri-modal cation- and anion-exchange column (Obelisc R) and on HILIC/ion-exchange columns (Obelisc N). Method explores unique properties of mixed-mode stationary phase which retains and separates cations like paraquat and diquat and anions/zwitter-ions like glyphosate in one run. Since columns are compatible with 100% organic and 100% water, a wide range of gradients can be used for analysis as well as isocratic conditions where it is desired. Method can be used for quantitation of these compounds in various matrices (soil, ground water, crops, food, etc.)

 

Condition

Column Obelisc R, 2.1×150 mm, 5 µm, 100A
Mobile Phase MeCN – 30%
Buffer Gradient AmFm pH 3.0 – 5-30 mM, 10 min
Flow Rate 0.4 ml/min
Detection UV, 250 nm, ELSD

 

Description

Class of Compounds
 Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds Paraquat, Diquat, Glyphosate
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc N

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

Select options

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

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Application Analytes:
Diquat
Glyphosate
Paraquat

Application Detection:
UV Detection
ELSD/MS Detection

Paraquat Diquat Separation in Non-aqueous Mobile Phase

2013-07-10

Paraquat, diquat and glyphosate were separated on reversed-phase tri-modal cation- and anion-exchange column (Obelisc R) and on HILIC/ion-exchange columns (Obelisc N). Method explores unique properties of mixed-mode stationary phase which retains and separates cations like paraquat and diquat and anions/zwitter-ions like glyphosate in one run. Since columns are compatible with 100% organic and 100% water, a wide range of gradients can be used for analysis as well as isocratic conditions where it is desired. Method can be used for quantitation of these compounds in various matrices (soil, ground water, crops, food, etc.)

 

Condition

Column Sharc 1, 4.6×100 mm, 5 µm, 100A
Mobile Phase MeCN/MeOH – 90/10%
Buffer H2SO4 – 0.2
Flow Rate 3 ml/min
Detection UV, 210 nm

 

Description

Class of Compounds
 Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds Paraquat, Diquat
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc N

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

Select options

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

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SHARC 1

The SHARC™ family of innovative columns are are the first commercially available columns with separation based primarily on hydrogen bonding. SHARC stands for Specific Hydrogen-bond Adsorption Resolution Column. Hydrogen bonding is an interaction (attraction) of bound hydrogen atom to the molecules with electronegative atoms such as oxygen, nitrogen, and fluorine.

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Application Analytes:
Diquat
Paraquat

Application Detection:
UV Detection

Separation of Paraquat, Diguat, and Glyphosate on Obelisc R Column

2013-07-03

 

Paraquat, diquat and glyphosate are three of most widely used herbicides in the world. Paraquat and diquat are very polar and very basic quaternary amines. Glyphosate is an aminophosphonic analog of glycine. It is very polar and acidic at most of the pH of the mobile phase. Since glyphosate and the quats have opposite charges no ion-pairing method can be developed for the mixture of basic and acidic herbicides. All three herbicides were separated on the Obelisc R tri-modal column. Paraquat and diquat are retained by a cation-exchange mechanism, and glyphosate is retained by weak reversed-phase and strong anion-exchange mechanisms. This method can be used for analysis of common herbicides in fruits, vegetables, ground water, drinking water and other matrices. Method is LC/MS compatible and can be used to determine trace levels of herbicides.

 

Condition

Column Obelisc R, 2.1×150 mm, 5 µm, 100A
Mobile Phase MeCN – 30%
Buffer Gradient AmFm pH 3.0 – 5-30 mM, 10 min
Flow Rate 0.4 ml/min
Detection UV, 250 nm, ELSD

 

Description

Class of Compounds
 Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds Paraquat, Diquat, Glyphosate
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

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Application Analytes:
Chloride
Diquat
Glyphosate
Paraquat
Sodium

Application Detection:
UV Detection
ELSD/MS Detection

HPLC Separation of Mixture of Paraquat and Diquat

2010-10-06


Paraquat and diquat are two of most widely used herbicides in the world. Both compounds are toxic for humans and animals. Presence of paraquat and diquat in water is regulated by EPA. Paraquat and diquat have two quaternary amines, making them very polar molecules. Paraquat and diquat also have similar formula. Due to low hydrophobicity and highly basic properties, they show limited retention on reversed-phase columns and produce very poor peak shape due to the residual silanol interactions. Primesep AB and Obelisc R column retain and separate these two compounds with perfect peak shape.

SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

Select options

Primesep AB

The Primesep family of mixed-mode columns offer a wide variety of stationary phases with an unprecedented selectivity in the separation of a broad array of chemical compounds and in multiple applications. Corresponding Primesep guard columns are available with all stationary phases and do not require holders. SIELC offers a method development service which is available for all customers. Ask about our special custom LC-phases tailored for specific separations.

Select options
Application Analytes:
Diquat
Paraquat

Application Detection:
UV Detection

HPLC Separation Paraquat and Diquat on Obelisc R

2010-03-03


Paraquat and diquat are two of most widely used herbicides in the world. Both compounds are toxic for humans and animals. Presence of paraquat and diquat in water is regulated by EPA. Paraquat and diquat have two quaternary amines, making them very polar molecules. Paraquat and diquat also have similar formula. Due to low hydrophobicity and highly basic properties, they show limited retention on reversed-phase columns and produce very poor peak shape due to the residual silanol interactions. Primesep AB and Obelisc R column retain and separate these two compounds with perfect peak shape. Method can be used for analysis of paraquat and diquat in soil, ground and drinking water, and other samples. Method allows to separate both compounds in one run without ion-pairing reagent.

SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Obelisc R

SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters  - Buffer concentration, Buffer pH, and Organic Modifier Concentration  - users can adjust the column properties with pinpoint precision to separate complex mixtures.

Select options

Primesep AB

The Primesep family of mixed-mode columns offer a wide variety of stationary phases with an unprecedented selectivity in the separation of a broad array of chemical compounds and in multiple applications. Corresponding Primesep guard columns are available with all stationary phases and do not require holders. SIELC offers a method development service which is available for all customers. Ask about our special custom LC-phases tailored for specific separations.

Select options
Application Analytes:
Diquat
Paraquat

Application Detection:
UV Detection