| Autor: |
KONG Hongxing, CHEN Qiying, MENG Haisen, CHEN Ruijue, FENG Jun, CHENG Hao |
| Jazyk: |
English<br />Chinese |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Shipin Kexue, Vol 44, Iss 18, Pp 331-338 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1002-6630 |
| DOI: |
10.7506/spkx1002-6630-20221109-095 |
| Popis: |
Fe3O4@SiO2@silver nanoparticles (AgNPs) were synthesized by a facile seed-mediated method and used as a surface enhanced Raman scattering (SERS) substrate to detect the content of the trace additive ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) in prepackaged dried rice noodles. Fe3O4@SiO2@AgNPs were characterized by transmission electron microscopy, X-ray energy spectroscopy, X-ray diffraction spectroscopy, infrared spectroscopy, and SERS spectroscopy. The results showed that Fe3O4@SiO2@AgNPs were a magnetic substrate with a core-shell structure, and a diameter of about 660 nm. The minimum detectable concentration of rhodamine 6G (R6G) solution was measured to be 1 × 10-9 mol/L and the enhancement factor was 4.27 × 108. The limit of detection (LOD) of EDTA-2Na solution using Fe3O4@SiO2@AgNPs was 1.75 × 10-6 mg/mL. Good linearity was observed between the SERS intensity of the characteristic peak at 1 625 cm-1 and the logarithmatic concentration of EDTA-2Na with a correlation coefficient (R2) of 0.994. The LOD was 0.1 mg/kg for EDTA-2Na in prepackaged dried rice noodles, and the recoveries for spiked samples were 96.50%–104.67% with relative standard deviation (RSD) of 1.2%–4.2%. Accordingly, this method can accurately, sensitively and rapidly detect whether EDTA-2Na is added in excess in prepackaged dried rice noodles. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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