Preparation method of a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow

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

Inactive Publication Date: 2021-03-02
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 of a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow
  • Preparation method of a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow
  • Preparation method of a dual-signal electrochemical sensor for rapid and selective detection of sunset yellow

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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 of a dual-signal electrochemical sensor for rapidly and selectively detecting sunset yellow, belonging to the field of electrochemical sensors. Including: (1) Preparation of PEI-GAs@AuNPs / SH-β-CD composite; (2) Preparation of PEI-GAs@AuNPs / SH-β-CD composite electrode; (3) Linear sweep voltammetry detection. The invention can not only overcome the interference of false positive or negative results of the single-signal electrochemical sensor and the interference signal of background current, but also can detect the food additive sunset yellow efficiently and sensitively, and improve the sensitivity and accuracy.

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 ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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