WO2000002844A1 - Quaternary ammonium salts, polymeric film containing them and colorimetric device - Google Patents
Quaternary ammonium salts, polymeric film containing them and colorimetric device Download PDFInfo
- Publication number
- WO2000002844A1 WO2000002844A1 PCT/GB1999/002081 GB9902081W WO0002844A1 WO 2000002844 A1 WO2000002844 A1 WO 2000002844A1 GB 9902081 W GB9902081 W GB 9902081W WO 0002844 A1 WO0002844 A1 WO 0002844A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- sensor device
- polymeric quaternary
- colorimetric sensor
- forming polymer
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/62—Quaternary ammonium compounds
- C07C211/63—Quaternary ammonium compounds having quaternised nitrogen atoms bound to acyclic carbon atoms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/84—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving inorganic compounds or pH
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/04—Tracheal tubes
- A61M16/0402—Special features for tracheal tubes not otherwise provided for
- A61M16/0411—Special features for tracheal tubes not otherwise provided for with means for differentiating between oesophageal and tracheal intubation
- A61M2016/0413—Special features for tracheal tubes not otherwise provided for with means for differentiating between oesophageal and tracheal intubation with detectors of CO2 in exhaled gases
Definitions
- This invention relates to oligomeric/polymeric quaternary alkyl ammonium cations, and salts thereof, for incorporation in colorimetric film sensors particularly for the detection of carbon dioxide.
- Carbon dioxide sensors are known which incorporate quaternary alkyl ammonium salts of pH indicator dye acids and carbonic acid within a thin transparent polymer membrane. They act as rapidly responding, reversible and non-consumpting detectors of carbon dioxide in the gas phase. Such sensors respond by changing colour on exposure to carbon dioxide. Furthermore, the response may be made quantitative by monitoring optical absorbance e.g. using monochromatic light. Colour change occurs through the reversible protonation of the indicator dye anion by carbonic acid formed by the reversible reaction of carbon dioxide with water bound within the film.
- Such sensor films have applications in medicine, horticulture, air conditioning systems, environmental monitoring and industrial health and safety.
- quaternary alkyl ammonium salts are not universally compatible with organic polymers, further restricting the choice of polymers for sensor film formulation.
- a high molecular weight oligomeric/polymeric quaternary alkyl ammonium cation, or salts thereof which are less mobile within a sensor film reducing the extent to which migration can occur. Reduced migration allows a wider choice of substrate materials which may now be thermodynamically compatible with the quaternary ammonium salt.
- R,, R 2 , R 3 and R 4 which may be the same or different, are each alkyl Cl to C20; m is an integer from 1 to 100; and n is an integer from 1 to 7.
- polymeric it is also intended to include oligomeric.
- Ri, R 2 , R 3 and R 4 which may be the same or different, are preferably alkyl C5 to 10. It is preferred that the values of n and m together should have a total in the range of from 4 to 8.
- m is an integer from 1 to 50, more preferably from 1 to 25, especially 1 to 10 and particularly 1 to 7.
- Particularly preferred salts are 1,8-octane-di-tripentyl ammonium bromide and 1,8- octane-di-tripentyl ammonium hydroxide.
- the salts of the cations of formula I may be selected from the group halide e.g. fluoride, chloride, bromide or iodide; hydroxide; carbonate and tetrafluoroborate.
- halides bromide salts are preferred, but especially preferred are the hydroxide salts.
- the cations of formula I, and thereof, are advantageous in that they produce an improved pH indicator dye with a greater compatibility with polymers, therefore allowing a wider choice of polymers for sensor film formulation.
- a film formulation comprising a cation of formula I, or a salt thereof, in intimate mixture with a transparent film-forming polymer vehicle.
- the transparent film-forming polymer vehicle should be compatible with the indicator material, such that the latter does not exude or otherwise undergo phase separation over a prolonged period (for the intended lifetime of the sensor).
- the film-forming polymer should be volatile, e.g. at room temperature and the polymeric quaternary ammonium cation, or a salt thereof, should be soluble in the polymer.
- the film-forming polymer vehicle should preferably be hydrolytically stable in order to avoid unwanted changes in the pH in the absence of carbon dioxide.
- the polymer should furthermore be permeable to carbon dioxide.
- the hydrolytically stable film-forming polymer may be water-soluble or organic solvent-soluble. It is preferred that the film-forming polymer is organic solvent soluble.
- suitable organic solvent soluble film-forming polymers include polyvinyl butyral, polyvinyl methyl ether, polymethyl ether, polymethyl methacrylate, ethyl cellulose and polystyrene.
- water-soluble film-forming polymers which also have good resistance to hydrolysis include hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyethylene glycol, polyvinyl alcohol (100% hydrolised) and polypropylene glycol.
- polymers include polydimethyl silicone, and polyurethane.
- Such a device may generally comprise;
- pH sensitive dyes including thymol blue, m-cresol purple, xylenol blue and/or cresol-red.
- the volatile polymer or oligomer may be any such material which is conventionally known in the art, for example, such as is described in PCT patent application No. WO96/24054 which describes that the film forming component is preferably a water- insoluble low volatility organic substance, which is not susceptible to alkaline hydrolysis and is liquid at temperatures below 100°C, e.g. at room temperature, or is semi-solid e.g. of waxy structure, at room temperature.
- Compounds which are "susceptible to alkaline hydrolysis” includes compounds such as those containing ester groups which are subjected to alkaline hydrolysis in the presence of a basic component.
- the film forming component may be selected from the group consisting of alcohols, phenols and alkoxylated derivatives of such substances, e.g. having at least one linear or branched polyether.
- the film forming component may have be a compound having one of the following structures:
- R 9 and R 12 each represents H or a linear or branched hydrocarbon residue of 1 to 50 carbon atoms, optionally containing one or more double bonds, triple bonds and/or ring structures,
- R 10 , R 11 and R 13 each represents a linear or branched hydrocarbon residue of 1 to 10 carbon atoms, x and y are equal or different integers from 0 to 100, p is an integer from 1 to 6, and q and r are equal or different integers from 0 to 4.
- Polyalkylene glycols such as polyethylene glycols, polyethylene glycols, polypropylene glycols, polybutylene glycols and copolymers of ethylene oxide, propylene oxide and/or butylene oxide.
- Other linear polyethers such as polytetrahydrofurans.
- Alkoxylated alcohols or phenols such as ethoxylated, propoxylated or butoxylated alcohols derived from fatty alcohols (straight or branched, saturated or unsaturated, etc), alkyl phenols, dialkyl phenols, alkyl naphthalenes, bisphenol A, alkyne diols, lanolin, cholesterol, phytosterol, sitosterol, glucose ethers and silicones; and mixed ethoxylated/propoxylated alcohols.
- Branched polyethers for instance products obtained by ethoxylating and/or propoxylating trimethylol propane or pentaerythritol.
- Alkoxylated amines such as ethoxylated and/or propoxylated primary or secondary amines or diamines.
- Dialkyl ethers e.g. dioctyl ether.
- Silicone oligomers or polymers may also be used since they have the advantage that, inter alia, they are highly permeable to carbon dioxide.
- a typical silicone polymer has permeability (that is, the gas transmission rate of a film of the polymer of thickness 0.001 inch, expressed as cubic centimetres of gas transmitted through 1 mm of film per 24 hours per square inch of film with one atmosphere differential across the film) is typically as follows:
- the silicone oligomers and polymers are, easy to handle and to apply to a suitable substrate using an organic solvent such as a hydrocarbon type solvent (such as hexane), a chlorinated solvent (for example, chloroform or dichloromethane), an ether solvent (such as tetrahydrofuran), or a low molecular weight oligomeric silicone (such as a cyclic dimethyl silicone).
- a hydrocarbon type solvent such as hexane
- a chlorinated solvent for example, chloroform or dichloromethane
- an ether solvent such as tetrahydrofuran
- a low molecular weight oligomeric silicone such as a cyclic dimethyl silicone
- silicone oligomers or polymers are substantially non-curable they have good storage stability and can be stored indefinitely in the solvent.
- the silicone oligomers or polymers are also readily compatible with the pH sensitive dye and the basic substance, and can be applied in the form of a film on a preformed substrate (such as a plastics, paper or glass substrate).
- a preformed substrate such as a plastics, paper or glass substrate.
- the silicone may be applied as an impregnation throughout a porous carrier medium, for example, of glass fibre, paper, plastics, textile fabric or the like. It is particularly preferred to use such materials which have been provided with a hydrophobic surface treatment, for example, by silanisation.
- the silicone oligomers or polymers are preferably substantially linear and substantially free of hydrophilic groups; preferred substituents for the silicone chain are methyl groups (although other low molecular weight hydrophobic groups may be employed, such as ethyl or trifluoromethyl groups).
- the silicone oligomer or polymer is a linear polydimethylsiloxane.
- the silicone preferably has a molecular weight in the range of 200 to 200000, and is preferably optically transparent. When higher molecular weight silicone polymers are used they are very good binders and have a low glass transition temperature such that they maintain their physical properties over a wide range of temperatures. They are furthermore non-toxic and non- volatile, and hydrolytically stable.
- the silicone oligomers or polymers are furthermore compatible with the indicator ingredients (the dye and the basic substrate), and can be free of migratable low molecular weight materials such as plasticisers or the like. .
- the device will be in the form of film sensor and the film may therefore require a support such as a polypropylene proper sheet, a cellulose layer or a plastics foil material.
- the sensor of the invention preferably comprises a silanised paper support which is preferably non-translucent i.e. is reflective, such as a white film which aids in visual indication.
- the support may be a transparent film on a glass substrate which permits quantitative interrogation with e.g. monochromatic light.
- the sensor device of the invention functions by the reaction of carbon dioxide with traces of water bound within the sensor film to form carbonic acid (H 2 CO 3 ).
- carbonic acid H 2 CO 3
- dissociation of H 2 CO 3 to H + and HCO 3 ' produces a fall in sensor pH which in turn produces an optical absorbance change through the reversible protonation of the pH indicator dye.
- the sensors of the invention have particular utility in determining the proper placement of a tracheal tube of an endotracheal intubation device in a patient.
- a further feature of the invention is to provide an endotracheal apparatus comprising a sensor as hereinbefore described.
- OTAB Octane- 1,8-di-tripentyl Ammonium Bromide
- 0.3g of the base:dye solution was added to lOg of 3% w/w polydimethyl silicone (PDMS) polymer solution and mixed before applying to a IPS filter paper.
- PDMS polydimethyl silicone
- Filter papers loaded with the sensor materials above showed a good response to 5% carbon dioxide and it is limited by the pH operating range of the dye. Adding a small amount (0.5-20 parts per hundred parts polydimethyl silicone) of polyethylene glycol (PEG) was again found to increase both the equilibrated sensitivity to CO 2 and the sensor response rate.
- PEG polyethylene glycol
- a fresh base;dye solution has been prepared using the conventional "two pot" formulation.
- Olg of m-cresol purple pH indicator dye was dissolved in lOg of 10% w/w methanolic solution of tetraoctyl ammonium hydroxide (TOAOH).
- TOAOH tetraoctyl ammonium hydroxide
- the methanoi was replaced by tetrahydrofuran by evaporating the methanoi and adding 8.9g of tetrahydrofuran 0.36g of the above base:dye solution was added to lOg of 10% w/w polymer solution (PDMS in dichloromethane) along with 0.36g of 0.5% w/w PEG before casting on microscope glass slide.
- PDMS w/w polymer solution
- the film was stored in an airtight glass jar with PURAFIL 100% carbon dioxide was passed into the jar to transform the film to the acidic state (yellow).
- the film was flushed with air after 24, 48, 96 and 800 hours and found to change colour to blue. The above result proved that exposing the film sensor to 100% carbon dioxide does not destroy the film mechanism provided that the film is well protected from other acid gases.
- Two film sensors were prepared in a similar fashion to the one described in the previous example.
- One of the above films was prepared without the addition of PEG. Both films were stored in an airtight glass jar with some PURAFIL for eighteen months. The films did not show any colour change.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99931365A EP1097123A1 (en) | 1998-07-11 | 1999-07-12 | Quaternary ammonium salts, polymeric film containing them and colorimetric device |
AU47903/99A AU4790399A (en) | 1998-07-11 | 1999-07-12 | Quaternary ammonium salts, polymeric film containing them and colorimetric device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9815001.4 | 1998-07-11 | ||
GBGB9815001.4A GB9815001D0 (en) | 1998-07-11 | 1998-07-11 | Formulations |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000002844A1 true WO2000002844A1 (en) | 2000-01-20 |
Family
ID=10835304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/002081 WO2000002844A1 (en) | 1998-07-11 | 1999-07-12 | Quaternary ammonium salts, polymeric film containing them and colorimetric device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1097123A1 (en) |
AU (1) | AU4790399A (en) |
GB (1) | GB9815001D0 (en) |
WO (1) | WO2000002844A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6436347B1 (en) * | 1999-01-21 | 2002-08-20 | Mincor Ab | Indicator device |
US7863459B2 (en) | 2005-12-16 | 2011-01-04 | Sun Chemical Corporation | Process for preparing onium salts |
WO2018085377A1 (en) * | 2016-11-02 | 2018-05-11 | Ohio State Innovation Foundation | Borate-containing membranes for gas separation |
US10175254B2 (en) | 2013-07-16 | 2019-01-08 | Palo Alto Health Sciences, Inc. | Methods and systems for quantitative colorimetric capnometry |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE855116C (en) * | 1949-02-15 | 1952-11-10 | Ciba Geigy | Process for the preparation of quaternary ammonium compounds |
DE905371C (en) * | 1950-12-08 | 1954-03-01 | May & Baker Ltd | Process for the preparation of new therapeutically effective quaternary ammonium salts |
DE1926436A1 (en) * | 1968-06-03 | 1970-01-29 | Squibb & Sons Inc | Hexamethylene-bis-alkyldimethylammonium bromides, process for their preparation and their use as fungicides and herbicides |
DE1908980A1 (en) * | 1969-02-22 | 1970-09-03 | Goldschmidt Ag Th | Alkyl-diethylenetriammonium cpds with bio - cidal activity |
DE2203229A1 (en) * | 1972-01-24 | 1973-07-26 | Hunt Chem Corp Philip A | Developer preservatives - quaternary ammonium sulphite cpds not giving side reactions eg with hardeners,nor making concentra |
DE2905373A1 (en) * | 1978-02-24 | 1979-09-06 | Gambar Labor | QUATERNAER AMMONIUM CHLORIODIDES, PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL PREPARATIONS CONTAINING THESE |
WO1989007957A1 (en) * | 1988-02-26 | 1989-09-08 | Brigham And Women's Hospital | Co2 indicator for placement of tracheal tubes |
US5005572A (en) * | 1988-02-26 | 1991-04-09 | Brigham & Women's Hospital | CO2 indicator and the use thereof to evaluate placement of tracheal tubes |
WO1991005252A1 (en) * | 1989-09-29 | 1991-04-18 | Abbey Biosystems Limited | Carbon dioxide monitor |
US5426213A (en) * | 1991-12-23 | 1995-06-20 | Abbott Laboratories | Polymeric buffering composition for fiber-optic physiological probe and method of making the same |
EP0666277A2 (en) * | 1994-02-02 | 1995-08-09 | General Electric Company | Method for making aromatic polycarbonates |
WO1996024054A1 (en) * | 1995-02-03 | 1996-08-08 | Icor Ab | A colorimetric device for indicating carbon dioxide |
JPH10208543A (en) * | 1997-01-21 | 1998-08-07 | Tdk Corp | Solid electrolyte and carbon dioxide sensor |
-
1998
- 1998-07-11 GB GBGB9815001.4A patent/GB9815001D0/en not_active Ceased
-
1999
- 1999-07-12 AU AU47903/99A patent/AU4790399A/en not_active Abandoned
- 1999-07-12 EP EP99931365A patent/EP1097123A1/en not_active Withdrawn
- 1999-07-12 WO PCT/GB1999/002081 patent/WO2000002844A1/en not_active Application Discontinuation
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE855116C (en) * | 1949-02-15 | 1952-11-10 | Ciba Geigy | Process for the preparation of quaternary ammonium compounds |
DE905371C (en) * | 1950-12-08 | 1954-03-01 | May & Baker Ltd | Process for the preparation of new therapeutically effective quaternary ammonium salts |
DE1926436A1 (en) * | 1968-06-03 | 1970-01-29 | Squibb & Sons Inc | Hexamethylene-bis-alkyldimethylammonium bromides, process for their preparation and their use as fungicides and herbicides |
DE1908980A1 (en) * | 1969-02-22 | 1970-09-03 | Goldschmidt Ag Th | Alkyl-diethylenetriammonium cpds with bio - cidal activity |
DE2203229A1 (en) * | 1972-01-24 | 1973-07-26 | Hunt Chem Corp Philip A | Developer preservatives - quaternary ammonium sulphite cpds not giving side reactions eg with hardeners,nor making concentra |
DE2905373A1 (en) * | 1978-02-24 | 1979-09-06 | Gambar Labor | QUATERNAER AMMONIUM CHLORIODIDES, PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL PREPARATIONS CONTAINING THESE |
WO1989007957A1 (en) * | 1988-02-26 | 1989-09-08 | Brigham And Women's Hospital | Co2 indicator for placement of tracheal tubes |
US5005572A (en) * | 1988-02-26 | 1991-04-09 | Brigham & Women's Hospital | CO2 indicator and the use thereof to evaluate placement of tracheal tubes |
WO1991005252A1 (en) * | 1989-09-29 | 1991-04-18 | Abbey Biosystems Limited | Carbon dioxide monitor |
EP0509998A1 (en) * | 1989-09-29 | 1992-10-28 | Abbey Biosystems Ltd | Carbon dioxide monitor. |
US5426213A (en) * | 1991-12-23 | 1995-06-20 | Abbott Laboratories | Polymeric buffering composition for fiber-optic physiological probe and method of making the same |
EP0666277A2 (en) * | 1994-02-02 | 1995-08-09 | General Electric Company | Method for making aromatic polycarbonates |
WO1996024054A1 (en) * | 1995-02-03 | 1996-08-08 | Icor Ab | A colorimetric device for indicating carbon dioxide |
JPH10208543A (en) * | 1997-01-21 | 1998-08-07 | Tdk Corp | Solid electrolyte and carbon dioxide sensor |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30) * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6436347B1 (en) * | 1999-01-21 | 2002-08-20 | Mincor Ab | Indicator device |
US7863459B2 (en) | 2005-12-16 | 2011-01-04 | Sun Chemical Corporation | Process for preparing onium salts |
US10175254B2 (en) | 2013-07-16 | 2019-01-08 | Palo Alto Health Sciences, Inc. | Methods and systems for quantitative colorimetric capnometry |
US11538569B2 (en) | 2013-07-16 | 2022-12-27 | Freespira. Inc. | Methods and systems for quantitative colorimetric capnometry |
WO2018085377A1 (en) * | 2016-11-02 | 2018-05-11 | Ohio State Innovation Foundation | Borate-containing membranes for gas separation |
US11000810B2 (en) | 2016-11-02 | 2021-05-11 | Ohio State Innovation Foundation | Borate-containing membranes for gas separation |
Also Published As
Publication number | Publication date |
---|---|
EP1097123A1 (en) | 2001-05-09 |
AU4790399A (en) | 2000-02-01 |
GB9815001D0 (en) | 1998-09-09 |
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