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High-throughput sers online detection method for sulfur dioxide in wine

A detection method, sulfur dioxide technology, applied in the field of Raman spectroscopy analysis and detection, can solve the problems of complex distillation process, low sensitivity, false negative, etc., and achieve the effect of improving Raman enhancement factor, increasing reaction efficiency and high detection sensitivity

Active Publication Date: 2020-10-02
SHANGHAI INST OF TECH
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Problems solved by technology

[0003] At present, the detection methods of sulfur dioxide mainly include distillation-iodometric method, pararosaniline hydrochloride colorimetric method and other methods, but these methods have defects such as complicated distillation process, long measurement time and low sensitivity. Interference, causing false positive or false negative errors, making the measurement results inaccurate

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  • High-throughput sers online detection method for sulfur dioxide in wine
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  • High-throughput sers online detection method for sulfur dioxide in wine

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Embodiment 1

[0026] (1) figure 1 A schematic diagram of the high-throughput SERS online detection of sulfur dioxide in wine by using microchannel technology is schematically given; the online detection device mainly includes a microchannel reactor and an online SERS platform;

[0027] The microchannel reactor is composed of two constant flow pumps and a microreactor. The delivery flow of the constant flow pump is in the range of 0.1ml / min to 20ml / min, which provides power for continuous sample injection and generates Interval air creates a blank baseline for SERS acquisition, thereby effectively and intuitively separating samples. The microreactor not only fully mixes the acidified wine sample with reagents, but also speeds up the Karl Fischer reaction efficiency and maximizes the detection of the presence of sulfur dioxide in wine.

[0028] The online SERS platform consists of a glass sample stage and a portable Raman instrument. In order to reduce noise and background interference and i...

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Abstract

The invention belongs to the technical field of nano sensing, and in particular relates to an online detection method for a high flux of sulfur dioxide in wine through an SERS (Surface Enhanced RamanScattering). The online detection method comprises the following steps of (1) preparing gold nanoparticles (AuNP) by using a sodium citrate reduction method, modifying 4-MPy (Mercaptopyridine) on surfaces of the gold nanoparticles to prepare a functionalized 4-MPy-AuNPs raman probe; (2) mixing an iodine elementary substance, starch, methanol and 4-MPy-AuNPs in proportion to prepare a Karl Flscherreagent; (3) enabling the Karl Flscher reagent and acidified wine to perform the Karl Flscher reaction in a microreactor; and (4) collecting a spectrum for a fluid pipe by using a portable raman probeto detect SO2 in the wine. The gold nanoparticles are introduced through the Karl Flscher reaction and are used as SERS substrate materials, meanwhile, the effect that the content of sulfur dioxide in the wine is continuously detected in high flux is realized by using an online SERS platform based on a micro-channel continuation technology. The method has the advantages of real timeless, online property, no pollution to a sample, high stability and the like.

Description

technical field [0001] The invention belongs to the technical field of Raman spectrum analysis and detection, and in particular relates to a high-throughput SERS online detection method for sulfur dioxide in wine. Background technique [0002] In the food industry, sulfur dioxide is widely used as a food additive because of its bleaching, anti-oxidation, antibacterial and antiseptic effects. There are two main forms of sulfur dioxide in food, one is free sulfur dioxide or sulfite, and the other is combined with certain aldehydes, ketones and sugar molecules to exist as bound sulfur dioxide. In the production process of fermented wine, sulfite is usually used as a preservative, resulting in the presence of sulfur dioxide residues in different amounts in wine products. When excessive sulfur dioxide exists, it will cause great damage to human heart and lung function. At the same time, the country enforces a limit standard of 250mg / L for the content of sulfur dioxide in red win...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹马亚丹段化珍邓维童璐子云
Owner SHANGHAI INST OF TECH
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