EP3724347A1 - Method and device for the qualitative and quantitative detection of biofilm-building bacteria contained in an aquatic system - Google Patents
Method and device for the qualitative and quantitative detection of biofilm-building bacteria contained in an aquatic systemInfo
- Publication number
- EP3724347A1 EP3724347A1 EP18803565.3A EP18803565A EP3724347A1 EP 3724347 A1 EP3724347 A1 EP 3724347A1 EP 18803565 A EP18803565 A EP 18803565A EP 3724347 A1 EP3724347 A1 EP 3724347A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bacteria
- aquatic system
- microtiter plate
- biofilm
- contained
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/06—Quantitative determination
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/06—Quantitative determination
- C12Q1/08—Quantitative determination using multifield media
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/04—Determining presence or kind of microorganism; Use of selective media for testing antibiotics or bacteriocides; Compositions containing a chemical indicator therefor
- C12Q1/10—Enterobacteria
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/21—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Pseudomonadaceae (F)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/24—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- G01N2333/245—Escherichia (G)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/195—Assays involving biological materials from specific organisms or of a specific nature from bacteria
- G01N2333/24—Assays involving biological materials from specific organisms or of a specific nature from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- G01N2333/265—Enterobacter (G)
Definitions
- the invention relates to a method and a device for the qualitative and quantitative detection of contained in an aquatic system, biofilm-forming bacteria of at least one bacterial genus.
- Biofilms represent microbial cell communities that are expressed in aquatic, i. aqueous systems, preferably at surfaces or interfaces of
- the mucus layer forms a kind of matrix, in which the microbial cells, so especially bacteria of the genus Legionella spp. are embedded, including the species Legionella pneumophila, and thus are surrounded by an environment that allows the bacteria a long lifetime.
- Legionella spp. can be found in both fresh and salt water and can be found in a temperature range between 25 ° C and 50 ° C
- Hot water production and distribution plants swimming pools, air washers in air conditioners, cooling towers, dead pipes, water tanks and the like. In particular, they can occur in hot water pipes or cold water pipes with external heat, which are not used for a long time.
- Cogeneration plant belonging cooling towers could be attributed.
- Each of the above methods of analysis provides on-site sampling and detection in a laboratory equipped for testing for Legionella.
- the document WO 2011/157584 A1 discloses a portable device and a method for the qualitative and quantitative determination of Legionella in water.
- the known device operates in several stages, in which contained in a defined amount of sample microorganisms separated by filtration and the Legionella from the separated microorganisms selectively means
- the immunomagnetic methods are separated to be subsequently labeled by means of suitable fluorescent markers.
- the labeled Legionella are excited by a suitable excitation source for fluorescence, which can then be registered by means of a detector and evaluated qualitatively and / or quantitatively by a computer system.
- the device is suitable for temporary or permanent integration in water-bearing systems, such as. Drinking water network, cooling towers, air conditioners, etc.
- TTC 2,3,5-triphenyltetrazolium chloride
- the invention is based on the object of a method and a device for the qualitative and quantitative detection of in an aquatic system
- biofilm-forming bacteria of at least one bacterial genus such that a safe and rapid analysis and determination at least for the detection of Legionella pneumophila within one to two days
- the device according to the invention should also be possible on site, ie in the form of a portable field device.
- the solution of the problem underlying the invention is specified in claim 1.
- the subject of claim 16 is a device in the form of a microtiter plate for carrying out the method according to the invention according to claim 1.
- Preferred uses are subject matter of claims 21 to 25. Den
- biofilm-forming bacteria of at least one bacterial genus on a biochemical reaction of the bacteria with at least one substance that initiates a bacteria-specific metabolic reaction by which a colorimetric reagent is chemically influenced, measured its spectrometric or more accurate, spectrophotometric properties and the Evidence of the biofilm-forming bacteria contained in the aquatic system.
- the method according to the invention uses the measurement of catabolism-based vitality or activity of specific biofilm-producing bacteria.
- the metabolic reactions necessary for the preservation of the living cells are considered, in which metabolic products are degraded from complex to simple molecules for the detoxification of the cell organism and for the production of energy.
- the detection of bacteria of the bacterial genera Legionella, Pseudomonas, Escherichia and Enterobacter is the detection of bacteria of the bacterial genera Legionella, Pseudomonas, Escherichia and Enterobacter.
- the choice of a bacteria-specific metabolic reaction initiating substance is a highly selective detection of bacteria of a particular
- Legionella pneumophila are preferably amino acids for the purpose of catabolization or metabolism by these bacteria, since amino acids, especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen for Legionella represent pneumophila.
- amino acids especially L-serine, L-threonine a preferred source of carbon and nitrogen
- Colorimetric reagent for example tetrazolium salt, preferably in the form of (2,3,5-triphenyl-2Fl-terazolium chloride, TTC) or in the form of (2- (4-iodophenyl) -3- (4-nitrophenyl) -5- ( 2,4-disulfophenyl) -2FI-tetrazolium, WST-1) with mPMS (1-methoxy-5-methyl-phenazinium methyl sulfate, such as electron mediator).
- TTC formazan test detection
- the colorimetric reagent which in the initial state is a colorless compound, is reduced by chemical reaction with the living and thus metabolically active bacteria to a soluble - formazan product - the amount of which is directly proportional to the number of living cells or bacteria within the aquatic system is.
- the method of optical Spectrophotometry which measures the optical absorbance of the aquatic system stained by the color change of the colorimetric reagent.
- an absolute extinction value and / or a temporally variable extinction function can be determined in order, for example, to determine the time
- Color development Information on the density and / or catabolic activity of bacteria within the aquatic system is provided.
- biofilm-producing bacteria in particular Legionella pneumophila amino acids, preferably L-serine and L-threonine or their degradation product catabolize a-ketobutyric acid preferably in a microaerophilic atmosphere
- biochemical reaction of the biofilm-forming bacteria contained within the aquatic system with the determined selected substance and the colorimetric added Reagent preferably under conditions of microaerophilic incubation at a temperature in the range between 25 ° C and 45 ° C, preferably between 30 ° C and 40 ° C, in particular carried out at 37 ° C.
- bacteria-specific substance of about 20 to 50 hours, preferably after just 24 hours, are obtained.
- the method according to the solution is especially suitable for further detection of bacteria of the following bacterial genera: Pseudomonas, Escherichia, Enterobacter.
- the bacterium Pseudomonas aeruginosa is suitable as a substance for Initiation of the bacteria-specific metabolic reaction L-arginine, L-asparagine, itaconic acid or putrescine.
- the bacterium Enterobacter aerogenes is suitable as substance for the initiation of the bacteria-specific metabolic reaction D-glucosaminic acid, D-cellobiose, ß-methyl-D-glucoside or D-mannitol.
- bacteria-specific metabolic reaction initiating substance L-phenylalanine, ⁇ -D-glucose or glucose-1-phosphate is suitable as the bacteria-specific metabolic reaction initiating substance L-phenylalanine, ⁇ -D-glucose or glucose-1-phosphate.
- At least a portion, preferably all of the aforementioned substances, which are catabolized by said biofilm-producing bacteria are used for the purpose of as comprehensive as possible detection of the biofilm-producing bacteria contained in an aquatic system. Flierzu the respective substances are stored separately in mutually isolated wells of a microtiter plate together with an above-described colorimetric reagent, in each of which a sample of the biofilm-forming bacteria-containing aquatic system is introduced.
- the use of a microtiter plate allows a simple and above all uniform handling and implementation of the biochemical reaction within the individual cavities under uniform reaction conditions.
- the use of a light-transparent microtiter plate known per se makes it possible to carry out a spectrophotometric measurement of all samples within the individual, mutually insulated cavities after a certain reaction time.
- a further preferred embodiment of the microtiter plate designed above for the purpose of detecting Legionella pneumophila provides for a further detection of the bacterium Pseudomonas aeruginosa in at least two further cavities in each case one substance which in each case differs and are selected from the group of the following substances: Arginine, L-asparagine, itaconic acid, putrescine.
- another embodiment provides for the additional detection of the bacterium Enterobacter aerogenes, in which at least two further cavities each contain a substance which is different from one another and those from the group of the following substances D-glucosaminic acid, D-cellobiose, ⁇ -methyl-D-glucoside, D-mannitol.
- a last preferred embodiment provides alternatively or in combination with the above-described preferred embodiments for further detection of the bacterium Escherichia coli in at least two other cavities respectively different substances, which are selected from the group of the following substances: L-phenylalanine, aD-glucose, Glucose-1-phosphate
- Tetrazolium salt preferably in the form of (2,3,5-triphenyl-2Fl-terazolium chloride, TTC) or (2- (4-iodophenyl) -3- (4-nitrophenyl) -5- (2,4-disulfophenyl) - 2FI-tetrazolium, WST-1) with mPMS (1-methoxy-5-methyl-phenazinium methyl sulfate, such as electron mediator).
- a preferred use of the microtiter plate designed in accordance with the invention is for the qualitative and quantitative determination of Legionella pneumophila contained in aquatic systems, preferably of at least one further biofilm-producing bacterium of the following group: Pseudomonas aeruginosa, Enterobacter aerogenes, Escherichia coli.
- microtiter plate and the associated method according to the invention for the qualitative and quantitative detection of biofilm-forming bacteria is primarily for the study of water in water distribution systems, i. including from the source to the end user, both for human and animal care and in industrial installations such as
- cooling towers for example cooling towers etc.
- the use of the microplate according to the invention is of great use, in particular for the investigation of the following aquatic systems: body fluids, especially urine, cerebrospinal fluid, bile, saliva, gastric juice, breast milk, vaginal secretions, tear fluid, nasal secretions, ejaculate.
- Bacteria all of which can be assigned to the so-called gram-negative bacterial group, become the ones to be detected and contained in the aquatic system
- hydromechanical modification in which the cell membrane permeability of the bacteria is specifically conditioned.
- the chemically and / or hydromechanically initiated modification leads to a change in the cell surface properties and an associated increase in the permeability of the bacterial membrane.
- Gram-negative bacteria in the respective outer membrane have non-specific transmembrane proteins, so-called porins, which serve for the exchange of substances through the membrane. It shows, for example, that the addition of the surface-active chemical substance Polysorbate 80 to the bacteria to be detected, a significant increase in the permeability of the outer cell membrane of the bacteria can be achieved.
- the membrane modification made at least the exchange of electrons or protons by the outer membrane with the aquatic environment is supported, whereby the bacteria-specific metabolic reaction which can be initiated by the at least one substance has a significantly higher efficiency and an associated temporal acceleration of the entire detection method can be carried out.
- the increase in the material permeability of the outer cell membrane caused by the membrane modification also leads to an increase in the detection capability or an improvement in the sensory sensitivity of the detection method according to the invention.
- low concentrations of bacteria can be detected in a sample and this within a very short detection periods of well below 24 h.
- the bioenergetic activity ie the temporal catabolic behavior of Legionella pneumophila
- the bioenergetic activity has already been determined by measuring the rates of electron flow into and through the electron transport chains on different metabolic substrates, for example of L-serine, L-threonine, a Ketobutyric acid and pyruvic acid methyl ester.
- L-serine L-threonine
- a Ketobutyric acid pyruvic acid methyl ester.
- the electrons always migrate from the beginning to the distal part of the electron transport chain, where a redox dye as the terminal Electron or proton acceptor acts, which converts the dye according to reduction, and the color change can be detected in the manner described spectrophotometrically.
- polysorbate 80 as one of
- Biosurfactants are also suitable for conditioning the cell membrane permeability of the bacteria. First of all rhamnolipid or surfactin.
- Fig. 1 is a schematic representation of the distribution of different substances within cavities of a microtiter plate.
- Figure 1 shows a tabular arrangement consisting of four columns (1, 2, 3, 4) and eight rows (AH), in the 32 fields distinguishable from each other by a individual column and row membership are addressable.
- the tabular arrangement illustrates very schematically a microtiter plate whose cavities are represented by the 32 fields.
- Selected fields or cavities of a microtiter plate represented by the tabular arrangement contain in each case the substances which can be taken from FIG. 1 and each of which is able to initiate a bacteria-specific metabolic reaction.
- the name of the bacterium is given in bold type
- Substance in the aquatic system reduced by way of a metabolic reaction.
- Representative in this context is the cavity located in column A column 2 mentioned, in which for the detection of the bacterium Enterobacter aerogenes the substance ß-methyl-D-glucoside is included.
- water is stored as a neutral buffer medium in one cavity, preferably in the well A / 1, on the basis of a photometric measurement
- a colorimetric reagent in the form of a redox indicator in the form of a redox indicator, preferably tetrazolium salt, is present in each well, for example in the form of (2,3,5-triphenyl-2Fl-terazolium chloride, TTC) or (2 - (4-iodophenyl) -3- (4-nitrophenyl) -5- (2,4-disulfophenyl) -2-FI-tetrazolium, WST-1) with mPMS (1-methoxy-5-methyl-phenazinium methyl sulfate, such as electron mediator).
- Substances distributed in different cavities are not to be understood as limiting, of course, alternative spatial distributions of the substances in the wells of a microtiter plate are largely possible.
- the fields / cavities filled with substances in FIG. 1, for example A / 3, B / 1, B / 2, B / 3, can also C / 1, etc., with further or already distributed in the microtiter plate substances are filled.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Analytical Chemistry (AREA)
- Toxicology (AREA)
- Immunology (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Physics & Mathematics (AREA)
- Biotechnology (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017222366.9A DE102017222366B4 (en) | 2017-12-11 | 2017-12-11 | Method and device for the qualitative and quantitative detection of biofilm-forming bacteria contained in an aquatic system |
PCT/EP2018/079866 WO2019115084A1 (en) | 2017-12-11 | 2018-10-31 | Method and device for the qualitative and quantitative detection of biofilm-building bacteria contained in an aquatic system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3724347A1 true EP3724347A1 (en) | 2020-10-21 |
Family
ID=64316481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18803565.3A Withdrawn EP3724347A1 (en) | 2017-12-11 | 2018-10-31 | Method and device for the qualitative and quantitative detection of biofilm-building bacteria contained in an aquatic system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20210071227A1 (en) |
EP (1) | EP3724347A1 (en) |
DE (1) | DE102017222366B4 (en) |
WO (1) | WO2019115084A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4129483A (en) * | 1977-03-03 | 1978-12-12 | Bochner Barry R | Device, composition and method for identifying microorganisms |
US6046021A (en) * | 1995-04-12 | 2000-04-04 | Biolog, Inc. | Comparative phenotype analysis of two or more microorganisms using a plurality of substrates within a multiwell testing device |
US20030162164A1 (en) * | 2001-04-20 | 2003-08-28 | Biolog, Inc. | Comparative phenotype analysis of cells, including testing of biologically active compounds |
DE102010017396A1 (en) | 2010-06-16 | 2011-12-22 | Hochschule Niederrhein | Legionella test |
-
2017
- 2017-12-11 DE DE102017222366.9A patent/DE102017222366B4/en active Active
-
2018
- 2018-10-31 EP EP18803565.3A patent/EP3724347A1/en not_active Withdrawn
- 2018-10-31 US US16/771,937 patent/US20210071227A1/en not_active Abandoned
- 2018-10-31 WO PCT/EP2018/079866 patent/WO2019115084A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE102017222366A1 (en) | 2019-06-13 |
DE102017222366B4 (en) | 2023-06-22 |
US20210071227A1 (en) | 2021-03-11 |
WO2019115084A1 (en) | 2019-06-20 |
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