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Method for on-site rapid detection of sulfur dioxide in tremella fuciformis and sampling paper chip

A sulfur dioxide and paper chip technology, which is used in measurement devices, instruments, material analysis by optical means, etc., can solve the problems of the precipitation mass transfer process that cannot be realized at the interface, the qualitative and quantitative analysis errors are large, and the mass transfer process is slow. Achieve the effect of solving slow solvent mass transfer, less sample consumption and wide application range

Active Publication Date: 2020-09-25
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution adopts the solvent adsorption method to achieve sampling. For dense white fungus with a high degree of dryness, the precipitation and mass transfer process at the interface cannot be realized, so the sampling error is relatively large. Even if there is a precipitation and mass transfer process at the interface, it is also due to The process is slow and the sampling efficiency is too low, which eventually leads to large errors in qualitative and quantitative analysis

Method used

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  • Method for on-site rapid detection of sulfur dioxide in tremella fuciformis and sampling paper chip
  • Method for on-site rapid detection of sulfur dioxide in tremella fuciformis and sampling paper chip
  • Method for on-site rapid detection of sulfur dioxide in tremella fuciformis and sampling paper chip

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Effect test

Embodiment 1

[0047] Figure 5 A flow chart of sulfur dioxide in white fungus according to the embodiment of the present invention is schematically given.

[0048] (1) Preparation of benzaldehyde-magenta complex (BMC)

[0049] Dissolve 0.2122g benzaldehyde in 10ml ethanol, then weigh 0.0338g basic fuchsin and dissolve it in 10ml ethanol, pour the two into a three-necked flask, add an appropriate amount of catalyst glacial acetic acid, condense and reflux for 5 hours under heating in an oil bath at 85°C , to obtain benzaldehyde-magenta complex (BMC), the SERS spectrum of benzaldehyde-magenta complex (BMC) see figure 2 .

[0050](2) Preparation of gold nanoparticles (AuNPs) (product see figure 1 )

[0051] Dissolve 10 mg of tetrachloroauric acid in 100 ml of distilled water and heat to boiling, then inject 1 ml of 1% sodium citrate solution under vigorous stirring, reflux for 30 min, and cool to room temperature to obtain a wine red solution, which is stored at 4 °C.

[0052] (3) Build ...

Embodiment 2

[0059] Determination of linear relationship

[0060] Prepare sodium sulfite standard solutions of different concentrations, and use steps (1), (2), (3), and (4) to obtain paper chips of residual sulfur dioxide, and then use a portable Raman spectrometer to detect its spectral signal, using Raman spectral peak 1036 ±2cm -1 As a characteristic peak for determining sulfur dioxide. With the gradual increase of the concentration of sodium sulfite standard solution in the solution to be tested (0.1 ~ 4000μM), the Raman spectrum is 1036 ± 2cm -1 The intensity of the characteristic peak at the position increases gradually ( image 3 ), select 1036±2cm -1 The corresponding peak intensities are combined with the linear curve ( Figure 4 ) can calculate the content of sulfur dioxide. According to the linear relationship between the concentration of sulfur dioxide and the Raman signal intensity, the detection limit (DL) is calculated based on the ratio of the standard deviation (δ) of...

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Abstract

The invention relates to a method for on-site rapid detection of sulfur dioxide in tremella fuciformis. The method comprises the following steps: S1, wiping the surface of a tremella fuciformis sampleto be tested through a benzaldehyde-fuchsin compound paper chip to obtain a sampled paper chip; S2, using a portable Raman spectrometer for detecting the sampled paper chip, the excitation wavelengthduring detection being 785 nm, and obtaining an SERS spectrum of the sample; and S3, carrying out characteristic peak comparison on the SERS spectrum, carrying out qualitative detection on sulfur dioxide, and carrying out quantitative detection on sulfur dioxide according to a linear relationship between the concentration of sulfur dioxide and Raman signal intensity. Compared with the prior art,the method has the characteristics of being rapid in analysis, high in sensitivity, small in sample dosage, easy and convenient to operate, convenient to carry and the like, SO2 in tremella fuciformiscan be analyzed and detected, and the detection limit is 1.2 * 10<-8> moL / L. Physical friction sampling is adopted in the sampling process, the detection precision and the detection efficiency are remarkably improved, and the requirement for trace detection is met.

Description

technical field [0001] The invention relates to the field of sulfur dioxide detection, in particular to a method for on-site rapid detection of sulfur dioxide in white fungus and a sampling paper chip. Background technique [0002] Sulfur dioxide (SO 2 ) is widely used as a preservative in the food and beverage industry due to its excellent antioxidant and antibacterial properties, inhibiting the growth of bacteria and discoloration caused by oxidation. Sulfur fumigation is often used in food processing to play the role of color protection, antisepsis, bleaching and anti-oxidation. For example, it can prevent oxidative browning or microbial contamination during storage and processing of fruits, fresh edible fungi and algae. Use SO 2 Gas fumigation of fruit and vegetable raw materials can inhibit the activity of oxidase in raw materials and make the products bright and beautiful in color. During the processing of white fungus, unscrupulous merchants will use sulfur to fum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李丹
Owner SHANGHAI INST OF TECH
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