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Method for rapidly detecting formaldehyde and acetaldehyde in wine on site

A formaldehyde and acetaldehyde technology, applied in the field of analysis and detection, can solve the problems such as unsuitable for formaldehyde detection and tediousness, achieve significant signal amplification, simplify the analysis process, and eliminate background interference

Active Publication Date: 2018-07-06
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sample of this method has to be treated with phenol to generate derivatives, which is cumbersome and not suitable for the detection of formaldehyde in edible wine samples

Method used

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  • Method for rapidly detecting formaldehyde and acetaldehyde in wine on site
  • Method for rapidly detecting formaldehyde and acetaldehyde in wine on site
  • Method for rapidly detecting formaldehyde and acetaldehyde in wine on site

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: μPAD-SERS technology detects formaldehyde-acetaldehyde mixed standard solution

[0028] (1) Preparation of silver ammonia solution containing p-aminothiophenol

[0029] Take 2mL of 0.01moL / L silver nitrate solution in a test tube, add 100μL of 0.1moL / L sodium hydroxide aqueous solution, oscillate, and produce a light yellow precipitate; add 80 microliters of dilute ammonia water drop by drop until the initial precipitate just dissolves Add 50 μL 1×10 -4 mol / L p-aminothiophenol, prepare the silver ammonia solution containing p-aminothiophenol;

[0030] (2) Prepare mixed standard solutions with different relative content of formaldehyde and acetaldehyde

[0031] Prepare six test tubes, marked as: 1, 2, 3, 4, 5, 6, respectively take formaldehyde: 0, 10, 20, 30, 40, 50 μL; acetaldehyde: 100, 80, 60, 40, 20, 0 μL . Prepare formaldehyde-acetaldehyde mixed standard solutions with formaldehyde contents of 0%, 20%, 40%, 60%, 80%, and 100%, respectively.

[0032] ...

Embodiment 2

[0041] Embodiment 2: detect the formaldehyde acetaldehyde in edible wine sample

[0042] Figure 9 Schematically provided the flow chart of the formaldehyde acetaldehyde in the wine of the embodiment of the present invention, described detection method comprises the following steps:

[0043] (1) preparation contains the silver ammonia solution of p-aminothiophenol, and step is with embodiment 1;

[0044] (2) prepare the mixed standard solution of formaldehyde acetaldehyde different relative content, step is with embodiment 1;

[0045] (3) build the analysis device of the formaldehyde acetaldehyde of μ-PAD, step is with embodiment 1;

[0046] (4) prepare p-aminothiophenol modified silver nanoparticles (Ag NPs-ATP) by silver mirror reaction, the steps are the same as in Example 1;

[0047] (5) μPAD-SERS detection of formaldehyde and acetaldehyde in wine.

[0048] The wine samples used in the experiment were three kinds of wine purchased from supermarkets. When measuring for...

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Abstract

The invention discloses a method for rapidly detecting formaldehyde and acetaldehyde in wine on site. The method is characterized in that a paper-based microfluidic analysis device [mu]-PAD is used for extracting formaldehyde and acetaldehyde from an edible wine sample, and with p-aminothiophenol ATP as a probe molecule and silver nanoparticles Ag NPs prepared during a silver mirror reaction as asurface-enhanced Raman scattering substrate, a change relationship between the peak intensity of the p-aminothiophenol and formaldehyde or acetaldehyde content is established through a portable Ramanspectrometer, so that on-site rapid quantitative and qualitative detection of formaldehyde and acetaldehyde in the to-be-detected wine sample is achieved. Compared with the existing method for rapidlydetecting formaldehyde and acetaldehyde on site, the method provided by the invention has the characteristics of being high in selectivity, fast in analysis, high in sensitivity, low in sample amount, wide in application range, simple and convenient to operate, convenient to carry and the like. With the method, the formaldehyde detection limit is 0.0046 [mu]M and the acetaldehyde detection limitis 0.0032 [mu]M.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for rapid on-site detection of formaldehyde and acetaldehyde in wine. Background technique [0002] Formaldehyde is a colorless gas with a strong pungent smell. It is a highly toxic protoplasmic poison that destroys biological cell proteins. It can cause tearing, nausea, and difficulty breathing. Cause damage, anesthetize the central nervous system, cause pulmonary edema, hepatic coma, kidney failure, etc. Driven by economic interests, some criminals use formaldehyde as a food additive, such as adding formaldehyde to wine-like beverages to prevent turbidity and increase transparency, which will cause serious food pollution and damage human health. The World Health Organization confirms that formaldehyde is a teratogen, a carcinogen, and a source of allergies, and long-term exposure will cause gene mutations. The "Food Sanitation Law of the Pe...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹段化珍曹海荣徐逍马亚丹邓维
Owner SHANGHAI INST OF TECH
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