Preparation method for dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow

A sunset yellow and selective technology, applied in the direction of electrochemical variables of materials, can solve problems such as background current interference and interference, and achieve the effect of enhancing sensitivity and selectivity, strong selectivity and good stability

Inactive Publication Date: 2019-06-21
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned sensing achieves high sensitivity for the detection of SY, however, the above-mentioned method is attached to a single current signal, which will cause interference caused by intrinsic background current or false positive and negative results

Method used

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  • Preparation method for dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow
  • Preparation method for dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow
  • Preparation method for dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow, comprising:

[0035] (1) Preparation of PEI-GAs@AuNPs / SH-β-CD composite:

[0036] i) Using 20 mL of graphene oxide aqueous solution (GO, 2 mg / mL) as starting material, a one-step hydrothermal method was used to prepare three-dimensional porous GAs;

[0037] ii) Prepare 1.0 mg / mL GAs (10 mL) solution and 1% PEI (5 mL) solution respectively, and mix 1 mL of chloroauric acid (HAuCl 4 , 24.6 mmol / L) to prepare PEI-GAs@AuNPs by reduction;

[0038] iii) The 1.0 mg / mL PEI-GAs@AuNPs and 1.0 mg / mL SH-β-CD solutions were ultrasonically mixed and centrifuged to obtain PEI-GAs@AuNPs / SH-β-CD.

[0039] (2) Preparation of PEI-GAs@AuNPs / SH-β-CD composite electrode: 1.0 mg / mL PEI-GAs@AuNPs / SH-β-CD solution was prepared, and 5 μL of the solution was drip-coated onto a pre-polished glass. The surface of the carbon electrode was dried under an infrared lamp to prepare a PEI-GA...

Embodiment 2

[0041] A method for preparing a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow, comprising:

[0042] (1) Preparation of PEI-GAs@AuNPs / SH-β-CD composite:

[0043] i) Using 15 mL of graphene oxide aqueous solution (GO, 2 mg / mL) as starting material, a one-step hydrothermal method was used to prepare three-dimensional porous GAs;

[0044] ii) Prepare 1.0 mg / mL GAs (9 mL) solution and 1% PEI (5 mL) solution respectively, and 0.5 mL chloroauric acid (HAuCl 4 , 24.6 mmol / L) to prepare PEI-GAs@AuNPs by reduction;

[0045] iii) The 1.0 mg / mL PEI-GAs@AuNPs and 1.0 mg / mL SH-β-CD solutions were ultrasonically mixed and centrifuged to obtain PEI-GAs@AuNPs / SH-β-CD.

[0046] (2) Preparation of PEI-GAs@AuNPs / SH-β-CD composite electrode: 1.0 mg / mL PEI-GAs@AuNPs / SH-β-CD solution was prepared, and 5 μL of the solution was drip-coated onto a pre-polished glass. The surface of the carbon electrode was dried under an infrared lamp to prepare a PEI-GAs@AuNP...

Embodiment 3

[0048] A method for preparing a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow, comprising:

[0049] (1) Preparation of PEI-GAs@AuNPs / SH-β-CD composite:

[0050] i) Using 18 mL of graphene oxide aqueous solution (GO, 2 mg / mL) as starting material, a one-step hydrothermal method was used to prepare three-dimensional porous GAs;

[0051] ii) Prepare 1.0 mg / mL GAs (8 mL) solution and 1% PEI (2 mL) solution respectively, and use a one-pot method to mix chloroauric acid (HAuCl 4 , 24.6 mmol / L) to prepare PEI-GAs@AuNPs by reduction;

[0052] iii) The 1.0 mg / mL PEI-GAs@AuNPs and 1.0 mg / mL SH-β-CD solutions were ultrasonically mixed and centrifuged to obtain PEI-GAs@AuNPs / SH-β-CD.

[0053] (2) Preparation of PEI-GAs@AuNPs / SH-β-CD composite electrode: 1.0 mg / mL PEI-GAs@AuNPs / SH-β-CD solution was prepared, and 5 μL of the solution was drip-coated onto a pre-polished glass. The surface of the carbon electrode was dried under an infrared lamp to p...

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Abstract

The invention discloses a preparation method for a dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow, which belongs to the field of electrochemical sensors. The method comprises steps of (1) preparation of a PEI-GAs@AuNPs / SH-beta-CD composite, (2) preparation of a PEI-GAs@AuNPs / SH-beta-CD composite electrode and (3) detection by using linear sweep voltammetry.The interference of a false positive or negative result of the single signal electrochemical sensor and background current interference signals can be overcome, the food additive sunset yellow can also be detected efficiently and sensitively, and the sensitivity and the accuracy are improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a preparation method of a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow. Background technique [0002] Synthetic pigment additives have been widely used in various foods due to their bright colors, low production costs, excellent water solubility and high stability, making food more edible and attractive. Sunset yellow is the most One of the synthetic coloring agents that can be found in common foods. Sunset yellow, orange-red powder or granules, easily soluble in water, glycerin, propylene glycol, slightly soluble in ethanol, insoluble in oil, strong hygroscopicity, heat resistance and light resistance. However, if a person eats a large amount of food with excessive pigment content such as sunset yellow for a long time or at one time, it may cause symptoms such as allergies and diarrhea. When the intake is too large and ...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 卢丽敏马雪刘光斌涂小龙谢羽高凤陈代安
Owner JIANGXI AGRICULTURAL UNIVERSITY
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