Highly reproducible and sensitive silver nanorod array for the rapid detection of Allura Red in candy

Yue Yao; Wen Wang; Kangzhen Tian; Whitney Marvella Ingram; Jie Cheng; Lulu Qu; Haitao Li; Caiqin Han

doi:10.1016/j.saa.2018.01.072

Highly reproducible and sensitive silver nanorod array for the rapid detection of Allura Red in candy

Spectrochim Acta A Mol Biomol Spectrosc. 2018 Apr 15:195:165-171. doi: 10.1016/j.saa.2018.01.072. Epub 2018 Jan 31.

Authors

Yue Yao¹, Wen Wang¹, Kangzhen Tian¹, Whitney Marvella Ingram², Jie Cheng³, Lulu Qu⁴, Haitao Li⁵, Caiqin Han⁶

Affiliations

¹ Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China; Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
² Department of Physics and Astronomy, Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, United States.
³ Institute of Quality Standards and Testing Technologies for Agro-products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
⁴ School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China. Electronic address: luluqu@jsnu.edu.cn.
⁵ School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
⁶ Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China; Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China. Electronic address: hancq@jsnu.edu.cn.

PMID: 29414574
DOI: 10.1016/j.saa.2018.01.072

Abstract

Allura Red (AR) is a highly stable synthetic red azo dye, which is widely used in the food industry to dye food and increase its attraction to consumers. However, the excessive consumption of AR can result in adverse health effects to humans. Therefore, a highly reproducible silver nanorod (AgNR) array was developed for surface enhanced Raman scattering (SERS) detection of AR in candy. The relative standard deviation (RSD) of AgNR substrate obtained from the same batch and different batches were 5.7% and 11.0%, respectively, demonstrating the high reproducibility. Using these highly reproducible AgNR arrays as the SERS substrates, AR was detected successfully, and its characteristic peaks were assigned by the density function theory (DFT) calculation. The limit of detection (LOD) of AR was determined to be 0.05 mg/L with a wide linear range of 0.8-100 mg/L. Furthermore, the AgNR SERS arrays can detect AR directly in different candy samples within 3 min without any complicated pretreatment. These results suggest the AgNR array can be used for rapid and qualitative SERS detection of AR, holding a great promise for expanding SERS application in food safety control field.

Keywords: Allura Red; DFT; SERS; Silver nanorods.

MeSH terms

Azo Compounds / analysis*
Candy / analysis*
Coloring Agents / analysis*
Metal Nanoparticles / chemistry*
Nanotubes / chemistry*
Silver / chemistry*
Spectrum Analysis, Raman

Substances

Azo Compounds
Coloring Agents
Allura Red AC Dye
Silver