Surface enhanced Raman scattering spectroscopic method for determining sorbic acid

A surface-enhanced Raman and surface-enhanced technology, applied in the field of analytical chemistry, can solve the problems of complex operation, large interference, insufficient detection sensitivity, etc., and achieve the effects of good selectivity, high sensitivity and good system stability.

Inactive Publication Date: 2017-08-04
GUANGXI NORMAL UNIV
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Problems solved by technology

Among the above-mentioned determination methods related to sorbic acid and its salts, some of them are complicated to operate, expensive to use instruments, certain s

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  • Surface enhanced Raman scattering spectroscopic method for determining sorbic acid

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[0022] Examples:

[0023] A surface-enhanced Raman scattering spectroscopy method for measuring sorbic acid, including the following steps:

[0024] (1) Prepare the sorbic acid standard solution system of known concentration: add 10 µL, 20 µL, 30 µL, 40 µL, 50 µL of 47 µmol / L sorbic acid standard solution to a graduated test tube, and then add 150 µL of 0.1% H 2 O 2 Solution, 120µL 0.15mo1 / L H 2 SO 4 The solution, shake well, react at room temperature for 40 minutes, add 50μL 500mg / L thiobarbituric acid solution, shake well, heat in a boiling water bath for 20 minutes, cool to room temperature, and then add 600μL 0.325 mmol / L gold nano sol 50μL 80 μmol / LAlCl 3 , Mix well, dilute the volume to 2.0 mL with twice distilled water;

[0025] (2) Prepare a blank control solution system: use the method in step (1) without adding sorbic acid standard solution to prepare a blank control solution system;

[0026] (3) Take appropriate amounts of the sorbic acid standard solution system and blank ...

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Abstract

The invention discloses a surface enhanced Raman scattering spectroscopic method for determining sorbic acid. The spectroscopic method is characterized by comprising the following steps: (1) preparing a sorbic acid standard solution with a known concentration, and determining an intensity value of a surface enhanced Raman peak at 1280cm<-1> as I; (2) preparing a blank control solution system which does not contain sorbic acid, and determining an intensity value of a surface enhanced Raman peak as I0; (3) calculating according to a formula: delta I=I-I0; (4) drawing a working curve for the concentration of sorbic acid by virtue of delta I; (5) preparing a measured sample solution, determining an intensity value of a surface enhanced Raman peak as I sample, and calculating according to a formula: deltaI sample=Isample-I0; and (6) calculating the concentration of sorbic acid in a measured sample according to the working curve. The spectroscopic method is high in sensitivity and good in selectivity and system stability.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a surface-enhanced Raman scattering spectroscopic method for determining sorbic acid. Background technique [0002] Sorbic acid, referred to as SA, scientific name is 2,4-hexadienoic acid, the pH value of its saturated aqueous solution is 3.6, slightly soluble in water, but soluble in organic solvents, and has good stability to light and heat, but in Long-term storage in the air is easy to be oxidized and colored; it has a good inhibitory effect on mold, yeast and aerobic bacteria. The pH value range of its antiseptic effect is 5-6, and the antiseptic effect decreases with the increase of pH value. Sorbic acid and its potassium and sodium salts are food preservatives that are allowed to be used in my country and have corresponding national standards. Due to their high safety and low toxicity, sorbic acid preservatives are often used as antifungal agents for jam, juice, mustard...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 蒋治良景琦梁爱惠
Owner GUANGXI NORMAL UNIV
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