Abstract

We describe the synthesis and evaluation of an azulene-based chemodosimeter for nitrite. The probe was found to undergo two distinct color changes upon introduction of aqueous nitrite ion. A near-instant formation of a grey color provides a qualitative indication of the presence of nitrite, followed by the formation of a deep-yellow/ orange color, the endpoint from which quantitative data can be derived. The azulene probe exhibits 1:1 stoichiometry of reaction with nitrite in water, and is selective for nitrite over other anions. The azulene probe was applied to determine nitrite content in cured meat, and compared with the British Standard testing procedure (Griess test). The value obtained from the azulene-based probe agreed closely with the standard test. Our procedure only requires the preparation of one standard solution, instead of the three required for the standard Griess test.
Original languageEnglish
Pages (from-to)90-96
Number of pages7
JournalFrontiers of Chemical Science and Engineering
Volume14
Issue number1
Early online date22 Mar 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • azulene
  • diazoquinone
  • nitrite

ASJC Scopus subject areas

  • Chemical Engineering(all)

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