Citation: LIU Hai-Xia, DI Jing, RAO Hong-Hong, ZHENG Yan-Ping, GUO Jin-Xin, ZHAO Guo-Hu. Determination of Nitrite and Nitrate in Dairy Products by Protonated Chitosan Functionalized Gold Nanoarticles Coated Stir Bar Sorptive Extraction with Ion Chromatography[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(9): 1395-1401. doi: 10.19756/j.issn.0253-3820.191277 shu

Determination of Nitrite and Nitrate in Dairy Products by Protonated Chitosan Functionalized Gold Nanoarticles Coated Stir Bar Sorptive Extraction with Ion Chromatography

LIU Hai-Xia ^1,3, ,
DI Jing ² ,
RAO Hong-Hong ^1,3 ,
ZHENG Yan-Ping ¹ ,
GUO Jin-Xin ¹ ,
ZHAO Guo-Hu ^1,3

1.
School of Chemistry and Chemical Engineering, Lanzhou City University, Lanzhou 730070, China;
2.
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
3.
Provincial Key Laboratory of Gansu Higher Education for City Environmental Pollution Control, Lanzhou 730070, China

Received Date: 11 May 2019
Revised Date: 19 July 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21765013).

Protonated chitosan (PCTS) modified gold nanoparticles (AuNPs) composites coating was fabricated using an etched stainless steel wire as a support on which AuNPs were first deposited, then after modified with CTS by self-assembly method and protonated. A method of stir bar sorptive extraction (SBSE) based on PCTS/AuNPs-ion chromatography (IC) was thus developed for measurement of nitrite and nitrate in dairy products. Experimental parameters including extraction temperature, pH, extraction time, desorption solvent and time were optimized. Under the optimized conditions, the dynamic linear ranges of the developed PCTS/AuNPs-SBSE method were 0.005-0.5 mg/L and 0.02-5.0 mg/L for the nitrite and nitrate with enrichment factors of 22-25 folds, the correlation coefficients were 0.9985 and 0.9988, the limits of detections were 0.0012 mg/L and 0.0067 mg/L (S/N=3), and RSDs were in the range of 2.6%-7.2% (n=5), respectively. In the case of real samples analyses, the recoveries of spiked nitrite and nitrate were 84.7%-100.4% with RSDs of 2.8%-8.5% (n=3). The developed method was simple, sensitive and selective, and could be used for the analysis of nitrite and nitrate in dairy products.
- Gold nanoparticles,
- Protonated chitosan,
- Stir bar sorption extraction,
- Nitrite and nitrate,
- Dairy products
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