Chiral CDs-based fluorescence sensor for rapid and specific sensing K4[Fe(CN)6] in table salt and salted food

Xiangyu Yin; Shanshan Wei; Changyu Zhai; Bin Wang; Hongyuan Zhang; Chenzhao Wang; Xuewei Song; Guoying Sun; Chunzhu Jiang

doi:10.1016/j.foodchem.2023.137207

Chiral CDs-based fluorescence sensor for rapid and specific sensing K₄[Fe(CN)₆] in table salt and salted food

Food Chem. 2024 Jan 30:432:137207. doi: 10.1016/j.foodchem.2023.137207. Epub 2023 Aug 20.

Authors

Xiangyu Yin¹, Shanshan Wei¹, Changyu Zhai², Bin Wang¹, Hongyuan Zhang¹, Chenzhao Wang¹, Xuewei Song¹, Guoying Sun³, Chunzhu Jiang⁴

Affiliations

¹ School of Chemistry and Life Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China; Advanced Institute of Materials Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China.
² School of Chemistry and Life Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China.
³ School of Chemistry and Life Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China; Advanced Institute of Materials Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China. Electronic address: sunguoying@ccut.edu.cn.
⁴ School of Chemistry and Life Science, Changchun University of Technology, 2055 Yanan Street, Changchun 130012, PR China. Electronic address: jiangcz@ccut.edu.cn.

PMID: 37657345
DOI: 10.1016/j.foodchem.2023.137207

Abstract

Potassium ferricyanide (K₄[Fe(CN)₆]) as anti-caking agent plays an important role in avoiding the formation of chunks for fine particulate solids. However, inappropriate and excessive addition and decomposition of K₄[Fe(CN)₆] are detrimental to physical health. At present, appropriate strategies for convenient and accurate analysis of K₄[Fe(CN)₆] in table salt and pickled food are desirable. Herein, an efficient "ON-OFF-ON" fluorescent sensor based on chiral carbon dots was prepared by a simple one-step hydrothermal method. The chiral CDs with L-Tryptophan and D-Tryptophan as chiral source were named as L-CDs and D-CDs. Notably, the bright fluorescence of L/D-CDs could be effectively quenched by K₄[Fe(CN)₆] through dynamic quenching mechanism. This fluorescent sensor achieved excellent sensitive and selective detection of K₄[Fe(CN)₆] with a limit of detection (LOD) of 25.0 ng·mL^-1. In addition, the L/D-CDs could be applied not only for selective fluorescent recognition of K₄[Fe(CN)₆] by the methods of portable filter paper and hydrogels, but also as fluorescent dye for repeated message encryption and decryption.

Keywords: Carbon dot; Fluorescent sensor; Potassium ferrocyanide; Table salt.

MeSH terms

Carbon
Fluorescent Dyes
Food
Sodium Chloride*
Sodium Chloride, Dietary*
Tryptophan

Substances

Sodium Chloride, Dietary
Sodium Chloride
Carbon
Fluorescent Dyes
Tryptophan