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Polyacid-based composite membrane electrode material for sensing L-tyrosine

An electrode material and composite membrane technology, which is applied in the field of multi-acid-based composite membrane electrode materials, can solve problems such as narrow linear range, low stability, and complicated preparation process, and achieve a wide linear range, good stability, and simple preparation methods. Effect

Inactive Publication Date: 2018-08-31
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention belongs to the technical field of electrochemical sensors, and aims to solve the problems of complex preparation process, narrow linear range and low stability of electrochemical sensors currently used for detecting L-tyrosine, and provide a sensor for sensing L-tyrosine. Polyacid based composite membrane electrode material

Method used

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  • Polyacid-based composite membrane electrode material for sensing L-tyrosine
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  • Polyacid-based composite membrane electrode material for sensing L-tyrosine

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specific Embodiment approach 1

[0020] Embodiment 1: This embodiment is a multi-acid-based composite membrane electrode material for sensing L-tyrosine. It is an ionic liquid function doped by an ITO electrode and a phosphorus molybdenum vanadium heteropolyacid externally loaded on the ITO electrode. Composed of a carbon nanotube composite film, the ITO electrode layer is followed by a polyethyleneimine layer (PEI), a phosphorus-molybdenum-vanadium heteropolyacid-doped ionic liquid-functionalized carbon nanotube layer, in which phosphorus-molybdenum-vanadium heteropolyacid Multi-acid-doped ionic liquid-functionalized carbon nanotube layer is a multilayer cycle with a cycle number of 8, denoted as PEI / [P 2 Mo 16 V 2 / BMIMBr-CNTs] 8 .

specific Embodiment approach 2

[0021] Specific embodiment two: a kind of preparation method of the polyacid based composite membrane electrode material for sensing L-tyrosine is carried out according to the following steps:

[0022] 1. P 2 Mo 16 V 2 Solution preparation:

[0023] ① Weigh P with an analytical balance 2 Mo 16 V 2 Heteropoly acid 17mg~19mg, under the condition of magnetic stirring with a stirring speed of 40r / min~60r / min, Dawson type polyoxometalate P 2 Mo 16 V 2 Dissolve in 6mL deionized water, stir for 10min to obtain solution A;

[0024] ② Transfer solution A to 10mL vial B;

[0025] P in solution A described in step ① 2 Mo 16 V 2 The mass ratio of heteropoly acid to deionized water is 17~19:6;

[0026] The ratio of the volume of solution A and vial B described in step one 2. is 3: 5;

[0027] Two, the preparation of BMIMBr-CNTs solution:

[0028] ① Mix 0.2g of CNTs and 0.3g~0.5g of BMIMBr directly in a mortar, and grind for 30min to obtain a uniform paste A;

[0029] ②Add 3...

specific Embodiment approach 3

[0041] Specific implementation mode three: the difference between this implementation mode and specific implementation modes one to two is: step one described in ①

[0042] Dawson-type polyoxometalates P 2 Mo 16 V 2 The dosage is 18mg. Other steps and parameters are the same as those in the specific embodiment 1 to 2.

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Abstract

The invention discloses a polyacid-based composite membrane electrode material for sensing L-tyrosine, and in particular, relates to a Dawson type heteropoly acid (P2Mo16V2) doped BMIMBr-CNTs composite material for sensing an L-tyrosine electrochemical working electrode. The invention belongs to a category of electrochemical sensors, and aims to solve the problems of complicated preparation process, narrow linear range and low stability of electrochemical sensors for detecting L-tyrosine. The product is composed of an ITO electrode and the Dawson type heteropoly acid doped ionic liquid functionalized carbon nanotube composite thin membrane PEI / [P2Mo16V2 / BMIMBr-CNTs]8 coating the exterior of the ITO electrode. The composite thin membrane has a multi-layered structure and the number of layers of the membrane is 8. The electrochemical sensor constructed with composite material as a work electrode can sense L-tyrosine, has a linear range of 1.80*10<-7> M-1.24*10<-4> M (M: mol / L), and has the detection limit of 1.0*10<-7> M. The electrode has high stability and good selectivity, and can be used for real sample detection.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, in particular to a polyacid-based composite membrane electrode material for sensing L-tyrosine. Background technique [0002] L-tyrosine, also known as 2-amino-3-p-hydroxyphenylalanine, is an aromatic polar α-amino acid containing phenolic hydroxyl groups, and is also one of the important raw materials for the synthesis of protein molecules. In the central nervous system, L-tyrosine is an important precursor for the synthesis of dopamine, thyroid hormones and neurotransmitters. In daily life, L-tyrosine is mostly an important nutritional supplement and food additive. Therefore, it is very important to determine the content of L-tyrosine in the fields of biochemistry, medicine and clinical analysis. Based on the electrooxidation reaction of L-tyrosine on the electrode surface, electrochemical techniques have been widely used to detect this active amino acid. However, on traditio...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/30G01N27/48
Inventor 马慧媛张璐璐焦佳谭立超庞海军
Owner HARBIN UNIV OF SCI & TECH
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