Capped fluorescent carbon dots for detection of hemin: role of number of -OH groups of capping agent in fluorescence quenching.
We have successfully demonstrated the use of capped carbon dot systems, namely, CDs/ β -cd, CDs/LMH, and CDs/Suc, as fluorescent sensors for the detection of hemin. The capped carbon dot systems showed quenching of PL intensity in the presence of hemin. The minimum detection limit was determined to be ~1 μ M. The PL response with free Fe(II) and Fe(III) was also studied. It was observed that PL quenching of capped carbon dot systems in the presence of hemin is dependent on the number of -OH groups in the capping agent. The order of quenching towards hemin was determined to be CDs/ β -cd > CDs/LMH = CDs/Suc > CDs. A possible mechanism to account for the observation is also discussed in the paper.
Physical Sciences Division, Polymer Unit, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
Upama
U
Baruah
Physical Sciences Division, Polymer Unit, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
Neelam
N
Gogoi
Department of Chemistry, Assam Engineering College, Jalukbari, Guwahati 781013, India.
Gitanjali
G
Majumdar
Physical Sciences Division, Polymer Unit, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
Devasish
D
Chowdhury
D002244:Carbon; D048271:Chitosan / Q000737:chemistry; D006427:Hemin / Q000032:analysis*; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry; D049449:Luminescence; D049329:Nanostructures; D013050:Spectrometry, Fluorescence / Q000379:methods
D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D006427:Hemin; D002244:Carbon; D048271:Chitosan