Method for detecting content of ferric ammonium citrate in table salt by using K-g-C3N4 (at) PDA nano-enzyme and application

The blue-green oxidation product was generated by the Kg-C3N4@PDA nanozyme catalytic reaction, and a standard curve was established, which solved the problem of low detection accuracy of ammonium ferric citrate in high-salt systems and achieved high-sensitivity and high-selectivity detection of ammonium ferric citrate, which is suitable for high-salt systems.

CN120685583APending Publication Date: 2025-09-23YUNNAN SALT IND CO LTD
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Patent Information

Application Number
CN202510720601.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

The existing technology has the problem of low detection accuracy when detecting the content of ammonium ferric citrate in table salt in a high-salt system, especially the low detection accuracy caused by interference from coexisting ions.

Method used

The Kg-C3N4@PDA nanozyme detection method was used to prepare ammonium ferric citrate standard solution and blank standard solution. Kg-C3N4@PDA nanozyme catalyzed the reaction of 2,2'-hydrazino-bis-3-ethylbenzothiazoline-6-sulfonic acid and H2O2 to generate a blue-green oxidation product. A standard curve was established to determine the content of ammonium ferric citrate in table salt.

Benefits of technology

The detection accuracy is improved, the detection time is short, the sensitivity is high, the selectivity is strong, and the content of ammonium ferric citrate can be accurately determined in a high-salt system. It has wide applicability, high detection accuracy, and a recovery rate of 94.09% to 105.17%.

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Abstract

The invention relates to the technical field of chemical analysis and detection, and aims to provide a high-sensitivity and strong-specificity ferric ammonium citrate detection method aiming at the defect of determining the content of ferric ammonium citrate in a high-salt system so as to improve the detection precision of the content of ferric ammonium citrate in table salt. The K-g-C3N4 (at) PDA nano-enzyme is prepared by adopting a two-step sylvite-assisted thermal copolymerization strategy, the nano-enzyme has peroxidase-like activity and can catalytically oxidize a substrate ABTS and H2O2 to generate a blue-green oxidation product (ox-ABTS) and generate maximum absorption at the wavelength of 416 nm under an acidic condition, ammonium ferric citrate can enhance the peroxidase-like activity of the K-g-C3N4 (at) PDA nano-enzyme, and the K-g-C3N4 (at) PDA nano-enzyme can be used for preparing the nano-enzyme. The concentration of the ferric ammonium citrate in the sample can be measured according to the linear relationship between the concentration of the ferric ammonium citrate and the increase of the absorbance of the ox-ABTS, so that the green color of the ox-ABTS is deepened, and the concentration of the ferric ammonium citrate in the sample can be measured according to the linear relationship. The K-g-C3N4-coated PDA nano enzyme is good in stability and high in salt tolerance, and various ions in the table salt have almost no influence on the detection result, so that the K-g-C3N4-coated PDA nano enzyme has good selection specificity and wider applicability.
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