期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 71, 期 2, 页码 1190-1200出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.2c05567
关键词
nucleophilic addition; hydrogen sulfide; cyanide; paper strips; food spoilage
A dual-approachable red-emitting fluorescent probe PBiSMe was synthesized for rapid detection of CN- and HS-. The probe exhibited high detection limits and good quantum yield, and could be applied for detecting H2S gas produced by food spoilage and fluorescence bioimaging of living cells.
Colorimetric and fluorescent probes have received a lot of attention for detecting lethal analytes in realistic systems and in living things. Herein, a dual-approachable Benzo-hemicyaninebased red-emitting fluorescent probe PBiSMe, for distinct and instantaneous detection of CN- and HS- was synthesized. The PBiSMe emitted red fluorescence (570 nm) can switch to turn-off (570 nm) and blue fluorescence (465 nm) in response to CN- and HS-, respectively. Other nucleophilic reagents, such as reactive sulfur species (RSS) and anions, have no contact or interference with the probe; instead, a unique approach is undertaken to exclusively interact with CN- and HS- over a wide pH range. The measured detection limits for CN- (0.43 mu M) and HS- (0.22 mu M) ions are lower than the World Health Organization's (WHO) recommended levels in drinking water. We confirmed 1:1 stoichiometry ratio using Job's plot and observed good quantum yield for both analytes. The probe-coated paper strips were used to detect the H2S gas produced by food spoilage (such as eggs, raw meat, and fish) via an eye-catching visual response. Moreover, fluorescence bioimaging studies of living cells was done to confirm the probe's potential by monitoring the presence of CN- and HS- in a living system.
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