Abstract
This study aimed to rapidly determine 13 representative sulfonamide (SA) residues in pork by using a surface-modified hydrophilic polystyrene sulfonic acid (PSSA) electrospun nanofibrous membrane as the solid-phase extraction (SPE) pretreatment sorbent, followed by ultra-performance liquid chromatography (UPLC) analysis. The highly hydrophilic nature of PSSA nanofibrous membrane created by vacuum plasma treatment was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), water contact angle, and X-ray photoelectron spectroscopy (XPS) measurements. In the pretreatment procedures, 13 SA standards, which were spiked in the fatty pork samples, were extracted, enriched, and purified by the SPE procedure based on the principle of ion exchange with the sulfonic groups on the PSSA chains. Under the optimized conditions, the calibration curves of 13 SA compounds showed good linearities with correlation coefficients (r) of more than 0.99 in the range of 50.0–200 μg kg−1. The mean recoveries of 13 SAs at the spiked concentrations of 50, 100, and 200 μg kg−1 were in the range of 70.3–92.5 % with average RSDs (n = 6) of less than 15 % (except for sulfacetamide, 56.9–61.6 %). Compared with other pretreatment methods reported previously, less organic solvent (especially without degreasing the extract with n-hexane) was used in this time-saving SPE procedure, which avoids the possibility of emulsification and therefore enhances the recoveries. The developed and validated analysis method was sensitive, accurate, rapid, convenient, environmentally friendly, and was successfully applied for the detection of 13 SA residues in commercially available pork samples.
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Abbreviations
- BE:
-
Binding energy
- DMF:
-
N,N-dimethylformamide
- EDTA:
-
Ethylenediaminetetraacetic acid
- FE-SEM:
-
Field emission scanning electron microscopy
- FT-IR:
-
Fourier transform infrared spectroscopy
- HLB:
-
Hydrophilic-lipophilic balance
- HPLC:
-
High-performance liquid chromatography
- LOD:
-
Limit of detection
- LOQ:
-
Limit of quantitation
- MCX:
-
Mixed-mode cation exchange
- MIP:
-
Molecularly imprinted polymer
- MRL:
-
Maximum residue limit
- MSPD:
-
Matrix solid-phase dispersion
- MWCNT:
-
Multi-walled carbon nanotube
- PP:
-
Polypropylene
- PS:
-
Polystyrene
- PSSA:
-
Polystyrene sulfonic acid
- QC:
-
Quality control
- SFA:
-
Sulfacetamide
- SA:
-
Sulfonamide
- SDM:
-
Sulfadimethoxine
- SIZ:
-
Sulfisoxazole
- SM1 :
-
Sulfamerazine
- SM2 :
-
Sulfamethazine
- SML:
-
Sulfabenzamide
- SMM:
-
Sulfamonomethoxine
- SMP:
-
Sulfamethoxypyridazine
- SMZ:
-
Sulfamethoxazole
- SP:
-
Sulfapyridine
- SPD:
-
Sulfachlorpyridazine
- SPE:
-
Solid-phase extraction
- SPP:
-
Sulfaphenazole
- SX:
-
Sulfamoxol
- THF:
-
Tetrahydrofuran
- UPLC:
-
Ultra-performance liquid chromatography
- XPS:
-
X-ray photoelectron spectroscopy
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Acknowledgements
The project was sponsored by the Jiangsu Province Science Foundation for Youths (BK20130644) and the Fundamental Research Funds for the Central Universities (JKQZ2013006). Dr. Rong Chen would also like to acknowledge the China Scholarship Council (CSC 201407060048) for granting a scholarship that enabled her to pursue this work at National University of Singapore, Singapore.
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Chen, R., Yang, Y., Qu, B. et al. Rapid determination of sulfonamide residues in pork by surface-modified hydrophilic electrospun nanofibrous membrane solid-phase extraction combined with ultra-performance liquid chromatography. Anal Bioanal Chem 408, 5499–5511 (2016). https://doi.org/10.1007/s00216-016-9648-z
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DOI: https://doi.org/10.1007/s00216-016-9648-z