To control and on-site evaluate the contamination of organophosphorus pesticides,one direct sensing approach based on spontaneous fluorescence resonance energy transfer(FRET)was developed in this study.The luminescent...To control and on-site evaluate the contamination of organophosphorus pesticides,one direct sensing approach based on spontaneous fluorescence resonance energy transfer(FRET)was developed in this study.The luminescent metal-organic frameworks(LMOFs),a novel achievement of MOFs,could provide adjustable adsorption capacity and fluorescence index to scientific analysis was first employed to evaluate phoxim molecules in vegetables and fruits.Through the π-π recognition and FRET sensing between phoxim molecules and skeleton of Nu-1000 LMOFs probes,an ultra-low detection limit of 1.65 pg/L in the range of 5×10^(-7) to 5×10^(-3) mg/mL(R^(2)=0.998)was achieved in the presence of phoxim.Such simple and accurate LMOFs-FRET-based sensing strategy could offer valuable reference for developing sensitive FRET sensors and/or on-site evaluation approaches in the areas of food quality control and food safety.展开更多
基金Supported by National Natural Science Foundation Of China （60873235, 60473099）, Science-Technology Development Key Project of Jilin Province of China （20080318）, and Program of New Century Excellent Talents in University of China （NCET-06-0300）
文摘To control and on-site evaluate the contamination of organophosphorus pesticides,one direct sensing approach based on spontaneous fluorescence resonance energy transfer(FRET)was developed in this study.The luminescent metal-organic frameworks(LMOFs),a novel achievement of MOFs,could provide adjustable adsorption capacity and fluorescence index to scientific analysis was first employed to evaluate phoxim molecules in vegetables and fruits.Through the π-π recognition and FRET sensing between phoxim molecules and skeleton of Nu-1000 LMOFs probes,an ultra-low detection limit of 1.65 pg/L in the range of 5×10^(-7) to 5×10^(-3) mg/mL(R^(2)=0.998)was achieved in the presence of phoxim.Such simple and accurate LMOFs-FRET-based sensing strategy could offer valuable reference for developing sensitive FRET sensors and/or on-site evaluation approaches in the areas of food quality control and food safety.
