posted on 2024-01-09, 18:40authored byYu-Xuan Dai, Yi-Xuan Li, Xue-Ji Zhang, Robert S. Marks, Serge Cosnier, Dan Shan
Selective and sensitive detection
of nitrite has important medical
and biological implications. In the present work, to obtain an enhanced
electrochemiluminescence (ECL) determination of nitrite, a novel nano-ECL
emitter CoBIM/cetyltrimethylammonium bromide (CTAB) was prepared via
a micelle–assisted, energy-saving, and ecofriendly method based
on benzimidazole (BIM) and CTAB. Unlike conventional micelle assistance,
the deprotonated BIM (BIM–) preferential placement
was in the palisade layer of cationic CTAB-based micelles. Enriching
the original CTAB micelle with BIM– disrupted its
stability and resulted in the formation of considerably smaller BIM/CTAB-based
micelles, providing a confined coordination environment for BIM– and Co2+. As a result, the growth of CoBIM/CTAB
was also limited. Owing to the unusual nitration reaction between
BIM and nitrite, the prepared CoBIM/CTAB was successfully applied
as a novel ECL probe for the detection of nitrite with a wide linear
range of 1–1500 μM and a low detection limit of 0.67
μM. This work also provides a promising ECL platform for ultrasensitive
monitoring of nitrite and it was applied with sausages and pickled
vegetables.