Motion‐Induced Changes in Emission as an Effective Strategy for the Ratiometric Probing of Human Serum Albumin and Trypsin in Biological Fluids. Issue 6 (21st February 2018)

• Record Type: Journal Article
• Authors: Dey, Nilanjan; Maji, Basudeb; Bhattacharya, Santanu
• Is Part Of: Chemistry, an Asian journal. Volume 13:Issue 6(2018)
• Page Start: 664
• Page End: 671
• Publication Date: 2018-02-21
• Subjects: aggregation -- fluorescence -- human serum albumin -- sensors -- trypsin; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201701795
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: Herein, we report the formation of a highly luminescent, pH‐sensitive, thermoreversible nanoaggregate in pure aqueous medium through the self‐agglomeration of carbazole‐based amphiphiles. The self‐assembly process restricted the intramolecular motion of the molecules and induced a change in its emission signal from blue to cyan, owing to an aggregation‐induced emission (AIE) effect. A similar type of ratiometric response was also observed in the presence of human serum albumin (HSA). However, in this case, the molecular motion of the flexible fluorescent probe was restricted by its embedded microenvironment, owing to a motion‐induced change in emission (MICE) effect, not by aggregation. Moreover, the probe showed quite high selectivity for HSA over other serum albumin proteins. Our carbazole‐based fluorescent probes are a unique example of the ratiometric sensing of HSA through the sole involvement of reversible noncovalent interactions. Considering the important of HSA in clinical diagnosis, a wide range of biological fluids, such as human urine, saliva, and plasma, were screened to analyze their HSA content. In addition, this system was also employed for the detection of trypsin at subnanomolar concentrations through the digestion of HSA. Abstract : Of MICE and men : A highly luminescent, pH‐sensitive, thermoreversible nanoaggregate was synthesized in aqueous medium through the self‐agglomeration of carbazole‐based amphiphiles. In the presence of human serum albumin (HSA), the molecular motion of the fluorescent probe was restricted by its microenvironment. This probe showed quite high selectivity for HSA and it was also used for the detection of trypsin at subnanomolar concentrations.