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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 skills are required for instrument operators, and the detection sensitivity is not enough, the interference is large, and the stability of the system is not high, etc.

Method used

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  • Surface enhanced Raman scattering spectroscopic method for determining sorbic acid

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Embodiment

[0023] A surface-enhanced Raman scattering spectroscopic method for measuring sorbic acid, comprising the steps:

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

[0025] (2) Prepare the blank control solution system: prepare the blank control solution system by the method of step (1) without adding sorbic acid standard solution;

[0026] (3) Take an appropriate amount of the sorbic acid standard solution system and the blank control solution system prepa...

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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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