Metabolic biosensor and uses thereof
First Claim
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1. A device for measuring a substrate as an analysis of the metabolism of a cell in a culture medium comprising;
- a first reaction vessel comprising a first oxidation or reduction reaction mixture containing a first enzyme and a cofactor, said first enzyme being capable of chemically reacting with the substrate to be measured, producing a product and causing reduction or oxidation of the cofactor;
a second reaction vessel containing a second oxidation or reduction reaction mixture containing a second enzyme, said second enzyme being capable of chemically further reacting with the product produced in the first reaction vessel producing a second product and causing reduction or oxidation of the cofactor;
a detector for determination of the cofactor reduced or oxidized in the first and/or second reaction vessel, said first and second reaction vessels and said detector being in fluid connection together in a closed circuit.
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Abstract
The present invention relates to a device for analyzing the metabolism of cells involved in a culture or fermentation process. A sample of the culture or fermentation medium is submitted to at least one oxidation-reduction reaction. The device of the invention includes two electrodes that measures the electric conductivity of samples and transmitted a message to an integration electronic system. Thereafter, the difference in the electric conductivity between the untreated and treated samples is indicative of the function of targeted metabolism pathway during the culture of the fermentation process.
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Citations
42 Claims
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1. A device for measuring a substrate as an analysis of the metabolism of a cell in a culture medium comprising;
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a first reaction vessel comprising a first oxidation or reduction reaction mixture containing a first enzyme and a cofactor, said first enzyme being capable of chemically reacting with the substrate to be measured, producing a product and causing reduction or oxidation of the cofactor;
a second reaction vessel containing a second oxidation or reduction reaction mixture containing a second enzyme, said second enzyme being capable of chemically further reacting with the product produced in the first reaction vessel producing a second product and causing reduction or oxidation of the cofactor;
a detector for determination of the cofactor reduced or oxidized in the first and/or second reaction vessel, said first and second reaction vessels and said detector being in fluid connection together in a closed circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for measuring a diacetyl potential in a yeast culture of a brewing process, said device comprising in fluid connection;
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a first reaction vessel comprising a catalyst or an enzyme allowing conversion of alpha acetolactate that may be present in the yeast culture into diacetyl;
a second reaction vessel containing a cofactor and an enzyme capable of converting in a redox reaction diacetyl into acetoin, oxidizing the cofactor; and
a detector for determinating the concentration of the cofactor so oxidized in the second reaction vessel, said first and second reaction vessels and said detector being in fluid connection together in a closed circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for monitoring metabolic rate of cells in a cell culture preparation comprising the steps of:
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a) contacting a sample of cell culture preparation containing a product to be measured as an indicator of said metabolic rate of said cells with a first oxidation or reduction reaction mixture containing an first enzyme and a cofactor, said first enzyme transforming the product to be measured causing reduction or oxidation of the cofactor to obtain a once-reacted sample containing a first transformed product and a reduced or oxidized cofactor;
b) contacting said once-reacted sample of step a) with a second oxidation or reduction reaction mixture containing a second enzyme, said second enzyme transforming the first transformed product of step b) causing reduction or oxidation of the cofactor to obtain a second transformed product and the reduced or oxidized cofactor;
c) detecting a concentration of cofactor reduced or oxidized in the first and/or second reaction vessel. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method for the determination of diacetyl concentration as an indicator of cell metabolic rate in a brewing fermentation process, said diacetyl being measured in a sample of a medium obtained from said fermentation process, said method comprising the steps of:
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a) contacting said sample in a first reaction mixture containing a catalyst for transforming alpha-acetolactate into diacetyl;
b) contacting said diacetyl produced in step a) with a second oxidation reaction mixture containing a cofactor and an enzyme for transforming diacetyl into acetoin causing oxidation of the cofactor; and
c) detecting the concentration of the oxidized cofactor of step b) with correlation to known standards. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification