Electrochemical preparation method for L-ascorbic acid detection

A technology of ascorbic acid and functionalization, applied in the direction of material electrochemical variables, measuring devices, scientific instruments, etc., can solve problems such as high condition requirements, physical damage, and complicated method operations

Inactive Publication Date: 2016-07-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the lack of AA in the human body will lead to many diseases, but too much intake of AA will also bring many damages to the body
At present, the detection methods...

Method used

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  • Electrochemical preparation method for L-ascorbic acid detection
  • Electrochemical preparation method for L-ascorbic acid detection
  • Electrochemical preparation method for L-ascorbic acid detection

Examples

Experimental program
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Effect test

Embodiment 1

[0047] An electrochemical preparation method for the detection of L-ascorbic acid AA, using a functionalized magnetic carbon-based-polymer microsphere composite modified glassy carbon electrode Fe 3 o 4 / GNS / MPCE / Pt is used as the working electrode to measure the concentration of L-ascorbic acid in the solution, the steps are as follows:

[0048] 1) Add the L-ascorbic acid sample to be tested into the phosphate buffer solution PBS to prepare the L-ascorbic acid solution, which is used as the electrolyte, and the pH of the electrolyte is controlled to be 6.0.

[0049] 2) Glassy carbon electrode Fe modified with functionalized magnetic carbon-based polymer microsphere composite 3 o 4 / GNS / MPCE / Pt is used as working electrode, Ag / AgCl electrode is used as reference electrode, platinum wire electrode is used as auxiliary electrode, placed in the electrolyte described in 1), and the scanning speed is 100mVs -1 Electrochemical testing.

[0050] The concentration range of L-ascor...

Embodiment 2

[0053] The glassy carbon electrode Fe modified by the functionalized magnetic carbon base-polymer microsphere composite material described in embodiment 1 3 o 4 / GNS / MPCE / Pt, the preparation steps are as follows:

[0054] 1) Grinding and polishing the glassy carbon electrode to make the base surface smooth and clean, then ultrasonically cleaning them with absolute ethanol and distilled water, and drying at room temperature to obtain a pretreated glassy carbon electrode; the polished and polished glassy carbon electrode is suspended with alumina Grinding and polishing the glassy carbon electrode.

[0055] 2) Synthesis of Fe by chemical co-precipitation method 3 o 4 magnetic nanoparticles, and the use of the surfactant sodium undecylenate NaUA on the magnetic nanoparticles Fe 3 o 4 Surface modification was carried out to obtain NaUA-modified Fe 3 o 4 ferrofluid.

[0056] The chemical co-precipitation method synthesizes Fe 3 o 4 Magnetic nanoparticles, the steps are as ...

Embodiment 3

[0080] According to the method described in Example 1, the difference is that the pH of the phosphate buffer solution electrolyte is 6.5, and the other treatment methods are the same.

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Abstract

The invention relates to an electrochemical preparation method for L-ascorbic acid detection.According to the method, a functional magnetic carbon-based polymeric microsphere composite material is prepared, an electrode is modified by utilizing the functional magnetic carbon-based polymeric microsphere composite material, the obtained modified glassy carbon electrode Fe304/GNS/MPCE/Pt serves as a working electrode, and then the electrochemical behavior of ascorbic acid AA on Fe304/GNS/MPCE/Pt is observed through cyclic voltammetry so as to detect the concentration of ascorbic acid AA.In the method for L-ascorbic acid detection, the concentration range of AA is from 1*10<-6> mol/L to 1.4*10<-4> mol/L, a good linear relation between the AA concentration and the oxidation peak current is presented, the detection limit is 8.05*10<-7> micromoles /L, and the method has the advantages of high sensitivity, simple operation and broad application prospect.

Description

technical field [0001] The invention relates to a modified electrode Fe 3 o 4 Preparation of electrochemical sensor of / GNS / MPCE / Pt and determination of L-ascorbic acid by using the sensor. Background technique [0002] L-Ascorbic Acid AA, also known as vitamin C, is ubiquitous in the daily diet and participates in various metabolic reactions of the human body, mainly concentrated in the liver and brain. It is an essential vitamin for maintaining human health, but the human body cannot synthesize it. AA plays an extremely important role in the human body and can participate in various reactions in the human body. A lack of AA in the human body can lead to many diseases, but excessive intake of AA can also cause many damages to the body. At present, the detection methods of AA mainly include spectrophotometry, fluorescence photometry, iodometric method, etc., but these methods either require high conditions or are complicated to operate. [0003] So far, with the vigorous...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/308G01N27/48
Inventor 李晓会周春华刘建国扈丹
Owner UNIV OF JINAN
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