Landing microextraction sediment phase onto surface enhanced Raman scattering to enhance sensitivity and selectivity for chromium speciation in food and environmental samples

Jingjing Wang; Waqas Ahmad; Md Mehedi Hassan; Muhammad Zareef; Annavaram Viswadevarayalu; Muhammad Arslan; Huanhuan Li; Quansheng Chen

doi:10.1016/j.foodchem.2020.126812

Landing microextraction sediment phase onto surface enhanced Raman scattering to enhance sensitivity and selectivity for chromium speciation in food and environmental samples

Food Chem. 2020 Apr 18:323:126812. doi: 10.1016/j.foodchem.2020.126812. Online ahead of print.

Authors

Jingjing Wang¹, Waqas Ahmad¹, Md Mehedi Hassan¹, Muhammad Zareef¹, Annavaram Viswadevarayalu¹, Muhammad Arslan¹, Huanhuan Li², Quansheng Chen³

Affiliations

¹ School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
² School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: 876865759@qq.com.
³ School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: qschen@ujs.edu.cn.

PMID: 32334303
DOI: 10.1016/j.foodchem.2020.126812

Abstract

The current study explores the first full mode liquid microextraction technique coupled with surface-enhanced Raman spectroscopy (SERS), and has been successfully applied for chromium speciation in food and environmental matrices. Herein, chromium as chlorochromate anion [CrO₃Cl]^- and the cationic rhodamine 6G [RG]⁺ dye has been extracted in organic phase as a complex ion associate [RG⁺.CrO₃Cl^-.nS]_org at pH ≤ 1.0. Afterwards, the extracted phase was deposited on the surface of the nano-flower shaped silver nanoparticles substrate and the SERS response was monitored against the reagent blank at 1505 cm^-1. Substrate characterizations, reaction mechanism assignment, stoichiometry, speciation, analytical applications, selectivity and validation were performed. The analytical procedure exhibits a detection limit of 0.03 µg L^-1 under the optimized experimental conditions. The accuracy of the proposed strategy was validated by inductively coupled plasma optical emission spectrometry method using student's t- and F tests at 95% confidence.

Keywords: Chromium; Dispersive liquid-liquid microextraction; SERS; Silver nano-flower.