Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for nitrite determination in food samples

Food Chem. 2018 Sep 15:260:13-18. doi: 10.1016/j.foodchem.2018.03.150. Epub 2018 Apr 2.

Abstract

In this work, a simple and effective strategy for designing a ratiometric fluorescent nanosensor was described. A carbon dots (CDs) based dual-emission nanosensor for nitrite was prepared by coating the CDs on to dye-doped silica nanoparticles. Dual-emission silica nanoparticles fluorescence was quenched in sulfuric acid using potassium bromate (KBrO3). The nitrite present catalyzed the KBrO3 oxidation, resulting in ratiometric fluorescence response of the dual-emission silica nanoparticles. Several important parameters affecting the performance of the nanosensor were investigated. Under optimized conditions, the limit of detection was 1.0 ng mL-1 and the linear range 10-160 ng mL-1. Furthermore, the sensor was suitable for nitrite determination in different food samples.

Keywords: Food samples; Nitrite; Ratiometric fluorescent probe; Silica nanoparticles.

MeSH terms

  • Bromates / chemistry
  • Carbon / chemistry
  • Fluorescent Dyes / chemistry*
  • Food Analysis / instrumentation
  • Food Analysis / methods*
  • Limit of Detection
  • Meat / analysis
  • Nanoparticles / chemistry*
  • Nitrites / analysis*
  • Quantum Dots / chemistry*
  • Rhodamines / chemistry
  • Silicon Dioxide / chemistry
  • Spectrometry, Fluorescence / methods
  • Vegetables

Substances

  • Bromates
  • Fluorescent Dyes
  • Nitrites
  • Rhodamines
  • potassium bromate
  • Carbon
  • Silicon Dioxide
  • rhodamine B