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Method for measuring sulphite in food using chlorauric acid resonance scattering spectrometry

A technique of resonance scattering and sulfite, which is applied in the field of analytical chemistry to achieve the effect of high sensitivity

Inactive Publication Date: 2008-11-05
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

At present, there is no report on the method of using chloroauric acid resonance scattering spectrometry to determine sulfite in food

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  • Method for measuring sulphite in food using chlorauric acid resonance scattering spectrometry

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Embodiment

[0014] In a 5ml colorimetric tube, add 0.60mL 223.2μg / mL (calculated as Au(III)) of HAuCl 4 Solution, 0.20mL 1.0% sulfamic acid solution, then add 0.10, 0.20, 0.50, 0.80, 1.00mL 116.0μg / mL sodium sulfite solution, shake, add double distilled water to the mark, shake well, and stand for 10min. On the fluorescence spectrophotometer, the excitation wavelength is equal to the emission wavelength for synchronous scanning to obtain the resonance scattering spectrum of the system. Measure the scattered light intensity I at 583nm 583nm and reagent blank I 0 , to calculate ΔI 583nm =I 583nm -I 0 value, its scattered light intensity ΔI 583nm The linear regression equation with the sulfite concentration C is ΔI 583nm =28.229C-18.968. In addition, accurately weigh 2g of white sugar, add water to dissolve it, and dilute to 10mL, shake well; take 1.0mL to measure the intensity of scattered light I 583nm Value, the sulfite content in white sugar can be calculated as 6.012μg / g.

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Abstract

The present invention discloses a method for measuring the sulfite in the food with a chlorauric acid resonance scattering spectrometric determination. A 5mL color comparison tube is sequentially added with a 223.2 mu g / mL (calculated with Au(III)) HAuCl4 for 0.10-1.50mL, 1.0% aminosulfonic solution for 0.05-0.5mL and 116.0 mu g / mL sodium sulfite for 0.05-1.50mL, shaking up, adding the secondary distilled water to volume, swaying to uniform, and placing for 5-180min. On a fluorospectrophotometer, a synchronous scanning in which the inspiring wavelength is equal to the transmission wavelength is adopted, and the resonance scattering spectrometric of the system is obtained. The intensity I583nm of scattering light and reagent vacancy I0 are measured at 583nm. The value of delta I583nm is calculated with the equation: delta I583nm=I583nm-I0. Additionally the white sugar with right amount is added and is dissolved in water. The value of intensity delta I583nm is measured according to the method, and then the content of sulfite in the white sugar can be calculated out. The measuring method according to the invention has the advantages of high sensitivity, easiness and shortcut.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for determining sulfite in food by chloroauric acid resonance scattering spectrometry. Background technique [0002] Sulfite is a traditional and commonly used food additive, widely used in food. Dissociate into sulfurous acid in acidic medium, and the active ingredient of sulfurous acid is sulfur dioxide (SO 2 ). where SO 2 It has reducing properties and plays the role of bleaching, decolorization, anti-oxidation and anti-corrosion. However, due to the certain toxicity of sulfite, if the human body takes too much, red blood cells and hemoglobin will decrease, and the gastrointestinal tract and liver will be damaged. The latest research has found that eating food or beverages containing sulfites in asthmatic patients is like inhaling sulfur dioxide gas, which can induce allergic diseases and make VB 1 damaged. Therefore, more and more researchers pay attention t...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 梁爱惠莫凌云蒋治良
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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