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Method for Determination of Resveratrol Content Using Liquid Phase Exfoliated Graphene Modified Electrode

A technology for modifying electrodes and resveratrol, which is applied in the direction of material electrochemical variables, can solve the problems of more training time, expensive resveratrol determination technology, low detection limit, etc., to improve the efficiency of liquid phase stripping, Solve the effect of long ultrasonic time and easy operation

Active Publication Date: 2018-04-03
HUBEI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects that the existing resveratrol determination technology is expensive and requires more training time, and provides a method for determining the content of resveratrol using a liquid-phase exfoliated graphene modified electrode. The graphene-modified electrode has the characteristics of high sensitivity and low detection limit for the detection of resveratrol, and the whole method is simple and easy, which can fully meet the requirements of the content determination of resveratrol.

Method used

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  • Method for Determination of Resveratrol Content Using Liquid Phase Exfoliated Graphene Modified Electrode
  • Method for Determination of Resveratrol Content Using Liquid Phase Exfoliated Graphene Modified Electrode
  • Method for Determination of Resveratrol Content Using Liquid Phase Exfoliated Graphene Modified Electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1, the preparation method of graphene modified electrode, comprises the steps:

[0039] (1) Weigh 30 mg, 10 mg and 2 mg of graphite powder, gallic acid and sodium hydroxide respectively with an electronic balance. Put the three substances into a 25mL beaker, then take 10mL of DMF (N,N-dimethylformamide) into the beaker with a pipette, put it into an ultrasonic instrument and sonicate for 2-3 hours to obtain a graphene dispersion (see figure 1 ).

[0040] (2) Take a small amount of neutral alumina (0.05 μm) and wet it with water on the polishing cloth, and polish the glassy carbon electrode (Φ=3mm) to a mirror surface on the polishing cloth;

[0041] (3) Ultrasonic cleaning with nitric acid, ethanol, and double-distilled water for 2 minutes, 2 minutes, and 1 minute respectively, and washing with distilled water before each replacement of the lotion, and drying under an infrared lamp after washing with double-distilled water;

[0042] (4) Take 5 μL of graphene dispersio...

Embodiment 2

[0054] This example is basically the same as Example 1, except that the amounts of graphite powder, gallic acid and sodium hydroxide in the preparation method of the graphene-modified electrode are 24 mg, 10 mg and 2 mg, respectively.

[0055] The follow-up is still the same as in Example 1. The content of the resveratrol solutions with different concentrations prepared above is determined using a graphene-modified electrode. The results show that it has good linearity and the detection limit is 0.01 μmol / L (S / N=3) .

Embodiment 3

[0057] This example is basically the same as Example 1, except that the amounts of graphite powder, gallic acid, and sodium hydroxide in the preparation method of the graphene-modified electrode are 60 mg, 10 mg, and 2 mg, respectively, and the amount of DMF is 15 mL.

[0058] The follow-up is still the same as in Example 1. The content of the resveratrol solutions with different concentrations prepared above is determined using a graphene-modified electrode. The results show that it has good linearity and the detection limit is 0.01 μmol / L (S / N=3) .

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Abstract

The invention discloses a method utilizing liquid phase to strip a graphene modified electrode to measure content of resveratrol. The method includes: performing liquid-phase stripping on graphite powder in a liquid medium (stripping solvent) to obtain graphene dispersion liquid; utilizing the graphene dispersion liquid to prepare the graphene modified electrode; utilizing the graphene modified electrode to measure content of resveratrol through an electrochemical method. When the method is in use, under optimal conditions, resveratrol has good linearity within a range of 0.03-5 umol / L and is down to 0.01 umol / L in detection limit. The method is simple and convenient to operate, time saving, low in cost and high in detection sensitivity, solves the problem that existing liquid-phase stripping methods are long in ultrasonic time and low in stripping efficiency, is especially suitable for measuring content of resveratrol in grape, red wine and Rhizoma Polygoni Cuspidati and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of electrochemical analysis of resveratrol, in particular to a method for measuring the content of resveratrol using a liquid-phase exfoliated graphene-modified electrode. Background technique [0002] Graphene is a carbon nanomaterial with a two-dimensional honeycomb lattice structure densely packed by a single layer of carbon atoms. Since its discovery in 2004, it has set off a wave of research all over the world. Graphene has many peculiar characteristics, has excellent electrical, optical, thermal and mechanical properties, and has caused revolutionary changes in many fields. Compared with fullerenes and carbon nanotubes, graphene has better properties, such as larger specific surface area, higher conductivity, and faster electron transfer rate. [0003] In 2004, Professor Andre K Geim (Andre Geim) and researcher Kostya Novoselov (Kostya Novoselov) from the University of Manchester in the UK used a very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/30G01N27/48
Inventor 谭小红宋新建付菊李晨晨杨平
Owner HUBEI UNIV FOR NATITIES
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