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Potassium ion concentration detection method

A potassium ion concentration and concentration technology, applied in the field of biomedicine, can solve problems such as complex operation and large error

Active Publication Date: 2012-10-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] (5) Atomic spectrophotometry can also be used to detect potassium and sodium ions in serum, but the operation is complicated and the error is large, and it is not as simple as flame photometry

Method used

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  • Potassium ion concentration detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The DNA capable of forming a G quadruplex used in this example is AGGGTTAGGGTTAGGGTTAGGG, and the cyanine dye used is a compound of the following formula

[0069]

[0070] 1) Prepare standard solution samples and test solutions

[0071] A certain amount of DNA was dissolved in Tris-HCl buffer solution with a pH value of 6.2 to prepare a DNA stock solution with a concentration of 200 μmol / L for later use.

[0072] Take 300 μL of methanol solution with a concentration of 200 μmol / L cyanine dye, add 19.2 ml of Tris-HCl buffer, and then add 300 μL of DNA solution and mix well. Divide the above sample into 10 parts on average, each sample solution is 1.98mL.

[0073] Take 6 samples among them, add a certain amount of KCl solution with a concentration of 200mmol / L, and then use Tris-HCl buffer solution to make the volume to 2mL, and the concentrations of potassium ions are 0, 0.05, 0.1, 0.25, 0.5, 0.8mmol / L standard solution sample.

[0074] Add 20 μL of the urine sampl...

Embodiment 2

[0083] The DNA capable of forming a G quadruplex used in this example is TGAGGGTGGGGAGGGTGGGGAA DNA, and the cyanine dye used is a compound of the following formula

[0084]

[0085] 1) Prepare standard solution samples and test solutions

[0086] A certain amount of DNA was dissolved in boric acid-borax buffer solution with a pH value of 8.2 to prepare a DNA stock solution with a concentration of 200 μmol / L for later use.

[0087] Take 300 μL of methanol solution with a concentration of 600 μmol / L cyanine dye, add 19.2 ml of boric acid-borax buffer, and then add 300 μL of DNA solution and mix well. Divide the above sample into 10 parts on average, each sample solution is 1.98mL.

[0088] Take 6 samples among them, add a certain amount of KCl solution with a concentration of 200mmol / L respectively, and then use boric acid-borax buffer solution to set the volume to 2mL, and the concentrations of potassium ions are respectively 0, 0.05, 0.1, 0.25, 0.5, 0.8mmol / L standard so...

Embodiment 3

[0097] The DNA capable of forming a G quadruplex used in this example is GGGCCAGGGAGCGGGGCGGAGGGGG, and the cyanine dye used is a compound of the following formula

[0098]

[0099] 1) Prepare standard solution samples and test solutions

[0100] A certain amount of DNA was dissolved in Tris-HCl buffer solution with a pH value of 7.2 to prepare a DNA stock solution with a concentration of 600 μmol / L for later use.

[0101] Take 300 μL of methanol solution with a concentration of 1.2 mmol / L cyanine dye, add 19.2 ml of Tris-HCl buffer, and then add 300 μL of DNA solution and mix well. Divide the above sample into 10 parts on average, each sample solution is 1.98mL.

[0102] Take 6 samples among them, add a certain amount of KCl solution with a concentration of 200mmol / L, and then use Tris-HCl buffer solution to make the volume to 2mL, and the concentrations of potassium ions are 0, 0.05, 0.1, 0.25, 0.5, 0.8mmol / L standard solution sample.

[0103] Add 20 μL of the urine sa...

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Abstract

The invention relates to a potassium ion concentration detection method. According to the method, characteristics comprising that potassium ion regulation allows G-quadruplex DNA structure transformation to be formed and cyanine dye supermolecular aggregates identify the G-quadruplex DNA structure transformation are utilized, a sample to be detected is added to a mixed solution of G-quadruplex DNA and the cyanine dye, the absorbance value at 560-590nm, 500-540nm or 610-670nm or the fluorescence intensity value at 580-640nm is determined, and the corresponding potassium ion concentration value can be obtained through finding the value corresponding to the absorbance value or the fluorescence intensity value on a standard curve. The method has a high specificity, so the method is not affected by sodium ions in the sample; and reagent components is simple, and the reaction process is simple, so errors generated by operations can be effectively reduced, and the test accuracy is high. The method can be rapidly realized through a common ultraviolet-visible absorption detector, a spectrophotometer or a fluorescent spectrometer without special or extra instruments, so the detection cost is low, thereby the popularization and the application of the method in industries are convenient.

Description

technical field [0001] The invention belongs to the field of biomedicine, and in particular relates to a potassium ion concentration detection method. Background technique [0002] Potassium in the human body is the main cation for maintaining the physiological activities of cells. It is necessary to maintain the normal osmotic pressure and acid-base balance of the body, participate in the metabolism of sugar and protein, and ensure the normal function of neuromuscular. Its content is an important indicator of human physiological activities. The levels of potassium ions in urine and serum can be clinically used to diagnose some kidney and heart diseases. [0003] Under normal circumstances, the potassium ion concentration of the human body has a reasonable reference range, such as in serum: 3.5-5.5mmol / L; in urine: 25-125mmol / 24h. When the potassium ion is higher than the reference value, hyperkalemia is manifested. The main reasons are: acute renal failure, severe hemolysi...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N21/33
CPCC09B23/0008C09B23/06G01N21/77G01N21/78G01N33/84G01N2021/7786
Inventor 唐亚林孙红霞杨千帆尚倩姜薇盖伟向俊锋
Owner INST OF CHEM CHINESE ACAD OF SCI
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